Stanković, Ana

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orcid::0000-0003-4433-2560
  • Stanković, Ana (38)

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Safe-by-design gelatin-modified zinc oxide nanoparticles

Janićijević, Željko; Stanković, Ana; Žegura, Bojana; Veljović, Đorđe; Đekić, Ljiljana; Krajišnik, Danina; Filipič, Metka; Stevanović, Magdalena

(Springer Science and Business Media B.V., 2021)

TY  - JOUR
AU  - Janićijević, Željko
AU  - Stanković, Ana
AU  - Žegura, Bojana
AU  - Veljović, Đorđe
AU  - Đekić, Ljiljana
AU  - Krajišnik, Danina
AU  - Filipič, Metka
AU  - Stevanović, Magdalena
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11876
AB  - We report an innovative low-cost wet  precipitation  synthesis  method  for  gelatin-modified   zinc oxide nanoparticles (GM ZnO NPs) at the inter- face  between  the  gelatin  hydrogel  and  aqueous  elec- trolyte.  Diffusion  of  ammonia  through  the  hydrogel   matrices with different gelatin contents induced pre- cipitation  of  the  product  in  contact  with  the  surface   of  the  aqueous  solution  of  zinc  ions.  The  obtained   precipitate  was  subjected  to  thermal  treatment  to  partially  decompose  the  adsorbed  gelatin  in  the  NP   structure. Physicochemical properties of obtained  GM  ZnO  NPs  were  characterized  by  X-ray  powder   diffraction (XRD), scanning electron microscopy  (SEM), Fourier transform infrared spectroscopy  (FTIR), differential thermal analysis (DTA), thermo- gravimetry (TG), photon correlation spectroscopy  (PCS),  zeta  potential  measurements,  and  inductively   coupled  plasma-mass  spectrometry  (ICP-MS).  The   estimated mean crystallite size of GM ZnO NP pow- ders was in the range from 5.8 to 12.1 nm. The syn- thesized  NPs  exhibited  nanosheet  morphology  and   arranged into flake-like aggregates. The toxic poten- tial was investigated in vitro in human hepatocellular  carcinoma cell line HepG2. The thiazolyl blue tetra- zolium bromide (MTS) assay was used to assess cell  viability,  2′,7′-dichlor-fluorescein-diacetate  (DCFH- DA)  assay  to  examine  the  formation  of  intracellu- lar  reactive  oxygen  species  (ROS),  and  comet  assay   to  evaluate  the  genotoxic  response.  GM  ZnO  NPs   slightly reduced HepG2 cell viability, did not induce  ROS formation, and showed low genotoxic potential  at  very  high  doses  (100  μg    mL−1).  ZnO  NPs  fabri- cated  and  modified  using  the  proposed  methodol- ogy deserve further study as potential candidates for  antibacterial agents or dietary supplements with low  overall toxicity.
PB  - Springer Science and Business Media B.V.
T2  - Journal of Nanoparticle Research
T1  - Safe-by-design gelatin-modified zinc oxide nanoparticles
VL  - 23
IS  - 9
DO  - 10.1007/s11051-021-05312-3
UR  - https://hdl.handle.net/21.15107/rcub_dais_11876
ER  - 
@article{
author = "Janićijević, Željko and Stanković, Ana and Žegura, Bojana and Veljović, Đorđe and Đekić, Ljiljana and Krajišnik, Danina and Filipič, Metka and Stevanović, Magdalena",
year = "2021",
abstract = "We report an innovative low-cost wet  precipitation  synthesis  method  for  gelatin-modified   zinc oxide nanoparticles (GM ZnO NPs) at the inter- face  between  the  gelatin  hydrogel  and  aqueous  elec- trolyte.  Diffusion  of  ammonia  through  the  hydrogel   matrices with different gelatin contents induced pre- cipitation  of  the  product  in  contact  with  the  surface   of  the  aqueous  solution  of  zinc  ions.  The  obtained   precipitate  was  subjected  to  thermal  treatment  to  partially  decompose  the  adsorbed  gelatin  in  the  NP   structure. Physicochemical properties of obtained  GM  ZnO  NPs  were  characterized  by  X-ray  powder   diffraction (XRD), scanning electron microscopy  (SEM), Fourier transform infrared spectroscopy  (FTIR), differential thermal analysis (DTA), thermo- gravimetry (TG), photon correlation spectroscopy  (PCS),  zeta  potential  measurements,  and  inductively   coupled  plasma-mass  spectrometry  (ICP-MS).  The   estimated mean crystallite size of GM ZnO NP pow- ders was in the range from 5.8 to 12.1 nm. The syn- thesized  NPs  exhibited  nanosheet  morphology  and   arranged into flake-like aggregates. The toxic poten- tial was investigated in vitro in human hepatocellular  carcinoma cell line HepG2. The thiazolyl blue tetra- zolium bromide (MTS) assay was used to assess cell  viability,  2′,7′-dichlor-fluorescein-diacetate  (DCFH- DA)  assay  to  examine  the  formation  of  intracellu- lar  reactive  oxygen  species  (ROS),  and  comet  assay   to  evaluate  the  genotoxic  response.  GM  ZnO  NPs   slightly reduced HepG2 cell viability, did not induce  ROS formation, and showed low genotoxic potential  at  very  high  doses  (100  μg    mL−1).  ZnO  NPs  fabri- cated  and  modified  using  the  proposed  methodol- ogy deserve further study as potential candidates for  antibacterial agents or dietary supplements with low  overall toxicity.",
publisher = "Springer Science and Business Media B.V.",
journal = "Journal of Nanoparticle Research",
title = "Safe-by-design gelatin-modified zinc oxide nanoparticles",
volume = "23",
number = "9",
doi = "10.1007/s11051-021-05312-3",
url = "https://hdl.handle.net/21.15107/rcub_dais_11876"
}
Janićijević, Ž., Stanković, A., Žegura, B., Veljović, Đ., Đekić, L., Krajišnik, D., Filipič, M.,& Stevanović, M.. (2021). Safe-by-design gelatin-modified zinc oxide nanoparticles. in Journal of Nanoparticle Research
Springer Science and Business Media B.V.., 23(9).
https://doi.org/10.1007/s11051-021-05312-3
https://hdl.handle.net/21.15107/rcub_dais_11876
Janićijević Ž, Stanković A, Žegura B, Veljović Đ, Đekić L, Krajišnik D, Filipič M, Stevanović M. Safe-by-design gelatin-modified zinc oxide nanoparticles. in Journal of Nanoparticle Research. 2021;23(9).
doi:10.1007/s11051-021-05312-3
https://hdl.handle.net/21.15107/rcub_dais_11876 .
Janićijević, Željko, Stanković, Ana, Žegura, Bojana, Veljović, Đorđe, Đekić, Ljiljana, Krajišnik, Danina, Filipič, Metka, Stevanović, Magdalena, "Safe-by-design gelatin-modified zinc oxide nanoparticles" in Journal of Nanoparticle Research, 23, no. 9 (2021),
https://doi.org/10.1007/s11051-021-05312-3 .,
https://hdl.handle.net/21.15107/rcub_dais_11876 .

Synthesis and characterization of ZnO nano/micro crystals with enhanced sunlight-induced photo-catalytic activity

Stanković, Ana; Veselinović, Ljiljana; Škapin, Srečo Davor; Marković, Smilja

(Belgrade : Serbian Ceramic Society, 2021)

TY  - CONF
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Škapin, Srečo Davor
AU  - Marković, Smilja
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11911
AB  - It is known that the functional properties of zinc oxide (ZnO) materials depend on their physico-chemical properties, such as optical properties and specific surface area. They are defined with structural characteristics, for example: the particle size and morphology, phase composition, crystallite size, crystallinity degree, as well as the crystal structure ordering, i.e., the presence of structural defects. The primary purpose of this study was to synthesize ZnO powders with various physico-chemical properties by optimizing the reaction conditions in different processing methods. For example, reaction temperature or addition of various surfactants such as polyvinyl alcohol, polyvinyl pyrrolidone, or polyethylene oxide. In this study, to vary physico-chemical properties of ZnO particles, four different synthesis methods were employed: mechanochemical, hydrothermal, ultrasonic and microwave processing. Structural and morphological properties of prepared ZnO powders were characterized using a number of techniques such as: X-ray powder diffraction (XRPD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance and photoluminescence (PL) spectroscopy. One of the functional properties of the synthesized ZnO powders that was particularly examined is photocatalytic activity. In order to examine ZnO as a photocatalyst, photodegradation of methylene blue (MB) dye was carried out under simulated and direct sunlight irradiation. The UV–Vis spectra showed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased absorption, and a slight red-shift of the absorption edge. Besides, the band gap energy of the synthesized ZnO micro and nanocrystals showed the red shift compared to bulk ZnO. According to the results of a Raman spectroscopy, the enhanced visible light absorption of the ZnO micro and nanocrystals is related to two phenomena: the existence of lattice defects (oxygen vacancies and zinc interstitials), and the particle surface sensitization by different surfactants.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021
T1  - Synthesis and characterization of ZnO nano/micro crystals with enhanced sunlight-induced photo-catalytic activity
SP  - 36
EP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_dais_11911
ER  - 
@conference{
author = "Stanković, Ana and Veselinović, Ljiljana and Škapin, Srečo Davor and Marković, Smilja",
year = "2021",
abstract = "It is known that the functional properties of zinc oxide (ZnO) materials depend on their physico-chemical properties, such as optical properties and specific surface area. They are defined with structural characteristics, for example: the particle size and morphology, phase composition, crystallite size, crystallinity degree, as well as the crystal structure ordering, i.e., the presence of structural defects. The primary purpose of this study was to synthesize ZnO powders with various physico-chemical properties by optimizing the reaction conditions in different processing methods. For example, reaction temperature or addition of various surfactants such as polyvinyl alcohol, polyvinyl pyrrolidone, or polyethylene oxide. In this study, to vary physico-chemical properties of ZnO particles, four different synthesis methods were employed: mechanochemical, hydrothermal, ultrasonic and microwave processing. Structural and morphological properties of prepared ZnO powders were characterized using a number of techniques such as: X-ray powder diffraction (XRPD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance and photoluminescence (PL) spectroscopy. One of the functional properties of the synthesized ZnO powders that was particularly examined is photocatalytic activity. In order to examine ZnO as a photocatalyst, photodegradation of methylene blue (MB) dye was carried out under simulated and direct sunlight irradiation. The UV–Vis spectra showed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased absorption, and a slight red-shift of the absorption edge. Besides, the band gap energy of the synthesized ZnO micro and nanocrystals showed the red shift compared to bulk ZnO. According to the results of a Raman spectroscopy, the enhanced visible light absorption of the ZnO micro and nanocrystals is related to two phenomena: the existence of lattice defects (oxygen vacancies and zinc interstitials), and the particle surface sensitization by different surfactants.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021",
title = "Synthesis and characterization of ZnO nano/micro crystals with enhanced sunlight-induced photo-catalytic activity",
pages = "36-36",
url = "https://hdl.handle.net/21.15107/rcub_dais_11911"
}
Stanković, A., Veselinović, L., Škapin, S. D.,& Marković, S.. (2021). Synthesis and characterization of ZnO nano/micro crystals with enhanced sunlight-induced photo-catalytic activity. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021
Belgrade : Serbian Ceramic Society., 36-36.
https://hdl.handle.net/21.15107/rcub_dais_11911
Stanković A, Veselinović L, Škapin SD, Marković S. Synthesis and characterization of ZnO nano/micro crystals with enhanced sunlight-induced photo-catalytic activity. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021. 2021;:36-36.
https://hdl.handle.net/21.15107/rcub_dais_11911 .
Stanković, Ana, Veselinović, Ljiljana, Škapin, Srečo Davor, Marković, Smilja, "Synthesis and characterization of ZnO nano/micro crystals with enhanced sunlight-induced photo-catalytic activity" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application IX : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 20-21. September 2021 (2021):36-36,
https://hdl.handle.net/21.15107/rcub_dais_11911 .

Synthesis, characterization and toxicity studies of gelatin modified zinc oxide nanoparticles

Janićijević, Željko; Stanković, Ana; Žegura, Bojana; Veljović, Đorđe; Filipič, Metka; Stevanović, Magdalena

(Belgrade : Institute of Technical Sciences of SASA, 2019)

TY  - CONF
AU  - Janićijević, Željko
AU  - Stanković, Ana
AU  - Žegura, Bojana
AU  - Veljović, Đorđe
AU  - Filipič, Metka
AU  - Stevanović, Magdalena
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6968
AB  - Nanostructured zinc oxides are promising materials for numerous biomedical applications where they can serve as therapeutic agents or tools for sensing and imaging. Despite their favorable properties, wider use of zinc oxide nanoparticles in biomedicine is limited by toxicity issues. Therefore, new synthesis approaches should be devised to obtain zinc oxide nanoparticles which are safe-by-design. We present an innovative low-cost wet precipitation synthesis of gelatin modified zinc oxide nanoparticles at the gel/liquid interface. The diffusion of ammonia through the gelatin hydrogels of different porosities induces precipitation of the product in contact with the surface of the aqueous solution of zinc ions. After thermal treatment of the precipitate, adsorbed organic residues of decomposed gelatin act as modifiers of zinc oxide nanoparticles. We characterized the physicochemical properties of obtained gelatin modified zinc oxide nanoparticles by XRD, FTIR, DTA/TG, and SEM. The synthesized nanoparticles show hexagonal wurtzite structure and form flakelike aggregates. FTIR and DTA/TG analyses indicate that the thermal decomposition of adsorbed gelatin depends on the gelatin content of the hydrogel used in the synthesis. We also examined the viability of HepG2 cells, generation of intracellular reactive oxygen species, and genotoxicity using the MTS, DCFH-DA, and alkaline comet assay, respectively. Fabricated gelatin modified zinc oxide nanoparticles show very low toxicity potential at doses relevant for human exposure.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
T1  - Synthesis, characterization and toxicity studies of gelatin modified zinc oxide nanoparticles
SP  - 3
EP  - 3
UR  - https://hdl.handle.net/21.15107/rcub_dais_6968
ER  - 
@conference{
author = "Janićijević, Željko and Stanković, Ana and Žegura, Bojana and Veljović, Đorđe and Filipič, Metka and Stevanović, Magdalena",
year = "2019",
abstract = "Nanostructured zinc oxides are promising materials for numerous biomedical applications where they can serve as therapeutic agents or tools for sensing and imaging. Despite their favorable properties, wider use of zinc oxide nanoparticles in biomedicine is limited by toxicity issues. Therefore, new synthesis approaches should be devised to obtain zinc oxide nanoparticles which are safe-by-design. We present an innovative low-cost wet precipitation synthesis of gelatin modified zinc oxide nanoparticles at the gel/liquid interface. The diffusion of ammonia through the gelatin hydrogels of different porosities induces precipitation of the product in contact with the surface of the aqueous solution of zinc ions. After thermal treatment of the precipitate, adsorbed organic residues of decomposed gelatin act as modifiers of zinc oxide nanoparticles. We characterized the physicochemical properties of obtained gelatin modified zinc oxide nanoparticles by XRD, FTIR, DTA/TG, and SEM. The synthesized nanoparticles show hexagonal wurtzite structure and form flakelike aggregates. FTIR and DTA/TG analyses indicate that the thermal decomposition of adsorbed gelatin depends on the gelatin content of the hydrogel used in the synthesis. We also examined the viability of HepG2 cells, generation of intracellular reactive oxygen species, and genotoxicity using the MTS, DCFH-DA, and alkaline comet assay, respectively. Fabricated gelatin modified zinc oxide nanoparticles show very low toxicity potential at doses relevant for human exposure.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia",
title = "Synthesis, characterization and toxicity studies of gelatin modified zinc oxide nanoparticles",
pages = "3-3",
url = "https://hdl.handle.net/21.15107/rcub_dais_6968"
}
Janićijević, Ž., Stanković, A., Žegura, B., Veljović, Đ., Filipič, M.,& Stevanović, M.. (2019). Synthesis, characterization and toxicity studies of gelatin modified zinc oxide nanoparticles. in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
Belgrade : Institute of Technical Sciences of SASA., 3-3.
https://hdl.handle.net/21.15107/rcub_dais_6968
Janićijević Ž, Stanković A, Žegura B, Veljović Đ, Filipič M, Stevanović M. Synthesis, characterization and toxicity studies of gelatin modified zinc oxide nanoparticles. in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia. 2019;:3-3.
https://hdl.handle.net/21.15107/rcub_dais_6968 .
Janićijević, Željko, Stanković, Ana, Žegura, Bojana, Veljović, Đorđe, Filipič, Metka, Stevanović, Magdalena, "Synthesis, characterization and toxicity studies of gelatin modified zinc oxide nanoparticles" in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia (2019):3-3,
https://hdl.handle.net/21.15107/rcub_dais_6968 .

Chapter 1 - Biomedical inorganic nanoparticles: preparation, properties, and perspectives

Stevanović, Magdalena; Lukić, Miodrag J.; Stanković, Ana; Filipović, Nenad; Kuzmanović, Maja; Janićijević, Željko

(Elsevier, 2019)

TY  - CHAP
AU  - Stevanović, Magdalena
AU  - Lukić, Miodrag J.
AU  - Stanković, Ana
AU  - Filipović, Nenad
AU  - Kuzmanović, Maja
AU  - Janićijević, Željko
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/B9780081028148000019
UR  - http://dais.sanu.ac.rs/123456789/5760
AB  - Nanotechnology has great potential in the biomedical field. Among other nanomaterials, inorganic nanoparticles have become extremely important since they possess unique physicochemical properties influenced by their specific surface structure. Consequently, inorganic nanoparticles exhibit enhanced functionalities such as biological response, antibacterial and antiviral properties, as well as optical, magnetic, and electrical responses. They have found applications in medicine, pharmacy, controlled drug delivery, optics, electronics, etc. In this chapter, reports on obtaining different metallic and ceramic inorganic nanoparticles such as gold, silver, selenium, copper, iron, zinc oxide, and hydroxyapatite for biomedical applications will be addressed. For each of these nanosystems, the main challenges regarding the currently achieved functional properties and further perspectives will also be presented.
PB  - Elsevier
T2  - Materials for Biomedical Engineering
T1  - Chapter 1 - Biomedical inorganic nanoparticles: preparation, properties, and perspectives
SP  - 1
EP  - 46
DO  - 10.1016/B978-0-08-102814-8.00001-9
UR  - https://hdl.handle.net/21.15107/rcub_dais_5760
ER  - 
@inbook{
author = "Stevanović, Magdalena and Lukić, Miodrag J. and Stanković, Ana and Filipović, Nenad and Kuzmanović, Maja and Janićijević, Željko",
year = "2019",
abstract = "Nanotechnology has great potential in the biomedical field. Among other nanomaterials, inorganic nanoparticles have become extremely important since they possess unique physicochemical properties influenced by their specific surface structure. Consequently, inorganic nanoparticles exhibit enhanced functionalities such as biological response, antibacterial and antiviral properties, as well as optical, magnetic, and electrical responses. They have found applications in medicine, pharmacy, controlled drug delivery, optics, electronics, etc. In this chapter, reports on obtaining different metallic and ceramic inorganic nanoparticles such as gold, silver, selenium, copper, iron, zinc oxide, and hydroxyapatite for biomedical applications will be addressed. For each of these nanosystems, the main challenges regarding the currently achieved functional properties and further perspectives will also be presented.",
publisher = "Elsevier",
journal = "Materials for Biomedical Engineering",
booktitle = "Chapter 1 - Biomedical inorganic nanoparticles: preparation, properties, and perspectives",
pages = "1-46",
doi = "10.1016/B978-0-08-102814-8.00001-9",
url = "https://hdl.handle.net/21.15107/rcub_dais_5760"
}
Stevanović, M., Lukić, M. J., Stanković, A., Filipović, N., Kuzmanović, M.,& Janićijević, Ž.. (2019). Chapter 1 - Biomedical inorganic nanoparticles: preparation, properties, and perspectives. in Materials for Biomedical Engineering
Elsevier., 1-46.
https://doi.org/10.1016/B978-0-08-102814-8.00001-9
https://hdl.handle.net/21.15107/rcub_dais_5760
Stevanović M, Lukić MJ, Stanković A, Filipović N, Kuzmanović M, Janićijević Ž. Chapter 1 - Biomedical inorganic nanoparticles: preparation, properties, and perspectives. in Materials for Biomedical Engineering. 2019;:1-46.
doi:10.1016/B978-0-08-102814-8.00001-9
https://hdl.handle.net/21.15107/rcub_dais_5760 .
Stevanović, Magdalena, Lukić, Miodrag J., Stanković, Ana, Filipović, Nenad, Kuzmanović, Maja, Janićijević, Željko, "Chapter 1 - Biomedical inorganic nanoparticles: preparation, properties, and perspectives" in Materials for Biomedical Engineering (2019):1-46,
https://doi.org/10.1016/B978-0-08-102814-8.00001-9 .,
https://hdl.handle.net/21.15107/rcub_dais_5760 .
2
3

Surfactant-Assisted Microwave Processed ZnO Nanoparticles with Optimized Surface-to-Bulk Defect Ratio For Potential Biomedical Application

Stanković, Ana; Drvenica, Ivana; Đukić Vuković, Aleksandra; Marković, Smilja

(2019)

TY  - CONF
AU  - Stanković, Ana
AU  - Drvenica, Ivana
AU  - Đukić Vuković, Aleksandra
AU  - Marković, Smilja
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/7009
AB  - Owing to a wide band gap energy (3.37 eV at RT) and a large exciton binding energy (60 meV), ZnO nanoparticles (ZnONP) have a diverse application, e.g. in electronics, optoelectronics, photocatalysis. Besides, ZnONP have a great potential in medicine for bioimaging, drug/gene delivery or as antimicrobial and anticancer agents. One of suggested governing mechanisms of the mentioned biological activities of ZnONP is based on formation of reactive oxygen species (ROS). When ZnONP absorb photon with energy equal or greater than its band gap, electrons are excited from the valence band (VB) to the conduction band (CB) leaving the holes in VB. Furthermore, the photogenerated holes (h+) and electrons (e-) migrate from bulk to surface. The photogenerated holes at the VB react with water molecules adsorbed at the particle surface to produce hydroxyl radical, while electrons in CB react with oxygen molecules generating anionic superoxide radical O2 -•. Superoxide radicals can be transformed in highly reactive OH• and so on [1]. Derivatives of this active oxygen can damage the bacterial/tumor cells [2]. However, in sufficiency ROS can damage normal cells as well. Thus, an understanding of ZnONP crystal structure-activity relationship and mechanism of ZnONP-related products formation and their consequent activity is crucial for the design of safe ZnONP based biomaterial for application in treating diseases like cancer. A series of ZnONP samples were synthesized by microwave processing of precipitate in the presence of a small amount (5 wt.%) of surfactants CTAB and citric acid. The particles crystallinity and purity were investigated by X-ray diffraction, Raman and ATR-FTIR spectroscopy. The particles morphology and texture properties were observed with field emission scanning electron microscopy (FE–SEM) and nitrogen adsorption–desorption isotherm, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence (PL) spectroscopy. ZnONP samples with different surface-to-bulk defect ratio were examined on ROS formation and antimicrobial activity. Future studies will be conducted with an aim to correlate surface-to-bulk defect ratio in ZnONP with mechanism of ROS formation and their cytotoxicity to normal and cancerous cells.
C3  - Book of Abstracts / First CA17140 COST Conference Cancer Nanomedicine – from the Bench to the Bedside, October 15-17, 2019, Bellevue Park Hotel, Riga, Latvia
T1  - Surfactant-Assisted Microwave Processed ZnO Nanoparticles with Optimized Surface-to-Bulk Defect Ratio For Potential Biomedical Application
SP  - 93
EP  - 93
UR  - https://hdl.handle.net/21.15107/rcub_dais_7009
ER  - 
@conference{
author = "Stanković, Ana and Drvenica, Ivana and Đukić Vuković, Aleksandra and Marković, Smilja",
year = "2019",
abstract = "Owing to a wide band gap energy (3.37 eV at RT) and a large exciton binding energy (60 meV), ZnO nanoparticles (ZnONP) have a diverse application, e.g. in electronics, optoelectronics, photocatalysis. Besides, ZnONP have a great potential in medicine for bioimaging, drug/gene delivery or as antimicrobial and anticancer agents. One of suggested governing mechanisms of the mentioned biological activities of ZnONP is based on formation of reactive oxygen species (ROS). When ZnONP absorb photon with energy equal or greater than its band gap, electrons are excited from the valence band (VB) to the conduction band (CB) leaving the holes in VB. Furthermore, the photogenerated holes (h+) and electrons (e-) migrate from bulk to surface. The photogenerated holes at the VB react with water molecules adsorbed at the particle surface to produce hydroxyl radical, while electrons in CB react with oxygen molecules generating anionic superoxide radical O2 -•. Superoxide radicals can be transformed in highly reactive OH• and so on [1]. Derivatives of this active oxygen can damage the bacterial/tumor cells [2]. However, in sufficiency ROS can damage normal cells as well. Thus, an understanding of ZnONP crystal structure-activity relationship and mechanism of ZnONP-related products formation and their consequent activity is crucial for the design of safe ZnONP based biomaterial for application in treating diseases like cancer. A series of ZnONP samples were synthesized by microwave processing of precipitate in the presence of a small amount (5 wt.%) of surfactants CTAB and citric acid. The particles crystallinity and purity were investigated by X-ray diffraction, Raman and ATR-FTIR spectroscopy. The particles morphology and texture properties were observed with field emission scanning electron microscopy (FE–SEM) and nitrogen adsorption–desorption isotherm, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence (PL) spectroscopy. ZnONP samples with different surface-to-bulk defect ratio were examined on ROS formation and antimicrobial activity. Future studies will be conducted with an aim to correlate surface-to-bulk defect ratio in ZnONP with mechanism of ROS formation and their cytotoxicity to normal and cancerous cells.",
journal = "Book of Abstracts / First CA17140 COST Conference Cancer Nanomedicine – from the Bench to the Bedside, October 15-17, 2019, Bellevue Park Hotel, Riga, Latvia",
title = "Surfactant-Assisted Microwave Processed ZnO Nanoparticles with Optimized Surface-to-Bulk Defect Ratio For Potential Biomedical Application",
pages = "93-93",
url = "https://hdl.handle.net/21.15107/rcub_dais_7009"
}
Stanković, A., Drvenica, I., Đukić Vuković, A.,& Marković, S.. (2019). Surfactant-Assisted Microwave Processed ZnO Nanoparticles with Optimized Surface-to-Bulk Defect Ratio For Potential Biomedical Application. in Book of Abstracts / First CA17140 COST Conference Cancer Nanomedicine – from the Bench to the Bedside, October 15-17, 2019, Bellevue Park Hotel, Riga, Latvia, 93-93.
https://hdl.handle.net/21.15107/rcub_dais_7009
Stanković A, Drvenica I, Đukić Vuković A, Marković S. Surfactant-Assisted Microwave Processed ZnO Nanoparticles with Optimized Surface-to-Bulk Defect Ratio For Potential Biomedical Application. in Book of Abstracts / First CA17140 COST Conference Cancer Nanomedicine – from the Bench to the Bedside, October 15-17, 2019, Bellevue Park Hotel, Riga, Latvia. 2019;:93-93.
https://hdl.handle.net/21.15107/rcub_dais_7009 .
Stanković, Ana, Drvenica, Ivana, Đukić Vuković, Aleksandra, Marković, Smilja, "Surfactant-Assisted Microwave Processed ZnO Nanoparticles with Optimized Surface-to-Bulk Defect Ratio For Potential Biomedical Application" in Book of Abstracts / First CA17140 COST Conference Cancer Nanomedicine – from the Bench to the Bedside, October 15-17, 2019, Bellevue Park Hotel, Riga, Latvia (2019):93-93,
https://hdl.handle.net/21.15107/rcub_dais_7009 .

Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite

Marković, Smilja; Stojković Simatović, Ivana; Stanković, Ana; Škapin, Srečo Davor; Mančić, Lidija; Mentus, Slavko; Uskoković, Dragan

(Belgrade : Serbian Academy of Sciences and Arts, 2018)

TY  - CONF
AU  - Marković, Smilja
AU  - Stojković Simatović, Ivana
AU  - Stanković, Ana
AU  - Škapin, Srečo Davor
AU  - Mančić, Lidija
AU  - Mentus, Slavko
AU  - Uskoković, Dragan
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/3631
AB  - Due to their high photoactivity, photostability, chemical inertness, simple syntheses procedures as well as low cost, semiconductor materials such as TiO2, ZnO, V2O5, and SnO2, are recognized as materials with a great potential for photoelectrochemical and photocatalytic applications. In particular, they can be used as photoanode in the process of photoelectrolysis of water, or to initiate decomposition of different organic or biological pollutants in water under light irradiation. Which wavelength of light will be absorbed depends on the semiconductor band gap; semiconductors with a wide band gap (> 3 eV) can absorb light in the UV range only, while those with a narrow band gap (< 3 eV) can be activated by visible light. Current trend in photo(electro)catalysis is to develop efficient semiconductors which can be activated by absorbing natural sunlight. During the years, various approaches have been developed to modify optical properties of semiconductors thus to be capable to absorb sunlight, for example: the incorporation of transition metal ions or defects into the crystal structure, the particles’ surface sensitization, hydrogenation, coupling of semiconductors with different band gap energies, etc.
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
T1  - Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite
SP  - 151
EP  - 153
UR  - https://hdl.handle.net/21.15107/rcub_dais_3631
ER  - 
@conference{
author = "Marković, Smilja and Stojković Simatović, Ivana and Stanković, Ana and Škapin, Srečo Davor and Mančić, Lidija and Mentus, Slavko and Uskoković, Dragan",
year = "2018",
abstract = "Due to their high photoactivity, photostability, chemical inertness, simple syntheses procedures as well as low cost, semiconductor materials such as TiO2, ZnO, V2O5, and SnO2, are recognized as materials with a great potential for photoelectrochemical and photocatalytic applications. In particular, they can be used as photoanode in the process of photoelectrolysis of water, or to initiate decomposition of different organic or biological pollutants in water under light irradiation. Which wavelength of light will be absorbed depends on the semiconductor band gap; semiconductors with a wide band gap (> 3 eV) can absorb light in the UV range only, while those with a narrow band gap (< 3 eV) can be activated by visible light. Current trend in photo(electro)catalysis is to develop efficient semiconductors which can be activated by absorbing natural sunlight. During the years, various approaches have been developed to modify optical properties of semiconductors thus to be capable to absorb sunlight, for example: the incorporation of transition metal ions or defects into the crystal structure, the particles’ surface sensitization, hydrogenation, coupling of semiconductors with different band gap energies, etc.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia",
title = "Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite",
pages = "151-153",
url = "https://hdl.handle.net/21.15107/rcub_dais_3631"
}
Marković, S., Stojković Simatović, I., Stanković, A., Škapin, S. D., Mančić, L., Mentus, S.,& Uskoković, D.. (2018). Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
Belgrade : Serbian Academy of Sciences and Arts., 151-153.
https://hdl.handle.net/21.15107/rcub_dais_3631
Marković S, Stojković Simatović I, Stanković A, Škapin SD, Mančić L, Mentus S, Uskoković D. Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia. 2018;:151-153.
https://hdl.handle.net/21.15107/rcub_dais_3631 .
Marković, Smilja, Stojković Simatović, Ivana, Stanković, Ana, Škapin, Srečo Davor, Mančić, Lidija, Mentus, Slavko, Uskoković, Dragan, "Sunlight-driven Photocatalytic and Photo-electrochemical Activity of ZnO/SnO2 Composite" in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia (2018):151-153,
https://hdl.handle.net/21.15107/rcub_dais_3631 .

Simultaneous enhancement of natural sunlight- and artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite

Marković, Smilja; Stanković, Ana; Dostanić, Jasmina; Veselinović, Ljiljana; Mančić, Lidija; Škapin, Srečo Davor; Dražić, Goran; Janković Častvan, Ivona; Uskoković, Dragan

(Royal Society of Chemistry, 2017)

TY  - JOUR
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Dostanić, Jasmina
AU  - Veselinović, Ljiljana
AU  - Mančić, Lidija
AU  - Škapin, Srečo Davor
AU  - Dražić, Goran
AU  - Janković Častvan, Ivona
AU  - Uskoković, Dragan
PY  - 2017
UR  - http://dais.sanu.ac.rs/123456789/2346
AB  - Mechanical milling of commercial ZnO and SnO2 was used to produce a ZnO/SnO2 composite with a high density of surface defects; in particular, zinc interstitials (Zni) and oxygen vacancies (VO). To determine the impact of surface defects on photocatalytic activity, the relative concentration ratio of bulk defects to surface defects was modified by annealing at 400 and 700 °C. The possible application of the ZnO/SnO2 composite as a natural sunlight and UV-light driven photocatalyst was revealed via de-colorization of methylene blue. In both cases the ZnO/SnO2 composite exhibited enhanced photocatalytic activity as compared to the pristine ZnO. In order to investigate the origin of the enhancement, the pristine metal oxides and composites were characterized using a variety of techniques, including X-ray diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), laser diffraction particle size analysis, Brunauer–Emmett–Teller, UV-Vis diffuse reflectance and photoluminescence spectroscopy. High-resolution transmission electron microscopy (HRTEM) and elemental mapping analyses were used to reveal the presence of SnO2 nanocrystallites on the surface of larger ZnO particles. The enhanced photocatalytic activity of the composite can be attributed to the synergetic effect of the surface defects and the ZnO/SnO2 heterojunction particles, which facilitated charge separation, thereby hindering the recombination of photogenerated carriers. This study draws attention to mechanical activation as an inexpensive and environmentally friendly technique for the large-scale production of the composite with an enhanced photocatalytic activity under illumination of either UV or sunlight.
PB  - Royal Society of Chemistry
T2  - RSC Advances
T1  - Simultaneous enhancement of natural sunlight- and artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite
SP  - 42725
EP  - 42737
VL  - 7
DO  - 10.1039/C7RA06895F
UR  - https://hdl.handle.net/21.15107/rcub_dais_2346
ER  - 
@article{
author = "Marković, Smilja and Stanković, Ana and Dostanić, Jasmina and Veselinović, Ljiljana and Mančić, Lidija and Škapin, Srečo Davor and Dražić, Goran and Janković Častvan, Ivona and Uskoković, Dragan",
year = "2017",
abstract = "Mechanical milling of commercial ZnO and SnO2 was used to produce a ZnO/SnO2 composite with a high density of surface defects; in particular, zinc interstitials (Zni) and oxygen vacancies (VO). To determine the impact of surface defects on photocatalytic activity, the relative concentration ratio of bulk defects to surface defects was modified by annealing at 400 and 700 °C. The possible application of the ZnO/SnO2 composite as a natural sunlight and UV-light driven photocatalyst was revealed via de-colorization of methylene blue. In both cases the ZnO/SnO2 composite exhibited enhanced photocatalytic activity as compared to the pristine ZnO. In order to investigate the origin of the enhancement, the pristine metal oxides and composites were characterized using a variety of techniques, including X-ray diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), laser diffraction particle size analysis, Brunauer–Emmett–Teller, UV-Vis diffuse reflectance and photoluminescence spectroscopy. High-resolution transmission electron microscopy (HRTEM) and elemental mapping analyses were used to reveal the presence of SnO2 nanocrystallites on the surface of larger ZnO particles. The enhanced photocatalytic activity of the composite can be attributed to the synergetic effect of the surface defects and the ZnO/SnO2 heterojunction particles, which facilitated charge separation, thereby hindering the recombination of photogenerated carriers. This study draws attention to mechanical activation as an inexpensive and environmentally friendly technique for the large-scale production of the composite with an enhanced photocatalytic activity under illumination of either UV or sunlight.",
publisher = "Royal Society of Chemistry",
journal = "RSC Advances",
title = "Simultaneous enhancement of natural sunlight- and artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite",
pages = "42725-42737",
volume = "7",
doi = "10.1039/C7RA06895F",
url = "https://hdl.handle.net/21.15107/rcub_dais_2346"
}
Marković, S., Stanković, A., Dostanić, J., Veselinović, L., Mančić, L., Škapin, S. D., Dražić, G., Janković Častvan, I.,& Uskoković, D.. (2017). Simultaneous enhancement of natural sunlight- and artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite. in RSC Advances
Royal Society of Chemistry., 7, 42725-42737.
https://doi.org/10.1039/C7RA06895F
https://hdl.handle.net/21.15107/rcub_dais_2346
Marković S, Stanković A, Dostanić J, Veselinović L, Mančić L, Škapin SD, Dražić G, Janković Častvan I, Uskoković D. Simultaneous enhancement of natural sunlight- and artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite. in RSC Advances. 2017;7:42725-42737.
doi:10.1039/C7RA06895F
https://hdl.handle.net/21.15107/rcub_dais_2346 .
Marković, Smilja, Stanković, Ana, Dostanić, Jasmina, Veselinović, Ljiljana, Mančić, Lidija, Škapin, Srečo Davor, Dražić, Goran, Janković Častvan, Ivona, Uskoković, Dragan, "Simultaneous enhancement of natural sunlight- and artificial UV-driven photocatalytic activity of a mechanically activated ZnO/SnO2 composite" in RSC Advances, 7 (2017):42725-42737,
https://doi.org/10.1039/C7RA06895F .,
https://hdl.handle.net/21.15107/rcub_dais_2346 .
16
16
17

Enhanced natural sunlight- and artificial UV-driven photocatalytic activity of mechanically activated ZnO/SnO2 composite

Marković, Smilja; Stanković, Ana; Dostanić, Jasmina; Mančić, Lidija; Škapin, Srečo Davor; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2017)

TY  - CONF
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Dostanić, Jasmina
AU  - Mančić, Lidija
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2017
UR  - http://dais.sanu.ac.rs/123456789/15440
AB  - Over the past four decades there is an increasing interest to develop highly efficient semiconductor photocatalysts for degradation of organic and biological pollutants in water under light irradiation. The semiconductor band gap determines which wavelength of light will be absorbed; precisely, semiconductors with a wide band gap (> 3 eV) can absorb only UV light, while those with a narrow band gap (< 3 eV) can be activated by visible light.
In this study we examined structural, morphological, textural and optical properties of ZnO/SnO2 composite as potential photocatalyst. Mechanical activation of commercial ZnO and SnO2 powders has been used to produce a composite with high density of surface defects. To investigate the influence of thermal treatment on the physical properties, and consequently on photoactivity, the composite has been traditionally annealed at 400 and 700 °C. The phase purity, crystal structure and average crystallite size of pristine metal oxides and the composites were investigated by X-ray diffraction and Raman spectroscopy. The particles morphology and size distributions were studied by FE–SEM and laser diffraction particle size analyzer, respectively. The textural properties were determined from N¬2¬ adsorption/desorption experiments, while the optical properties were studied using UV–Vis diffuse reflectance and photoluminescence spectroscopy. Photocatalytic activity of pristine ZnO and ZnO/SnO2 composites were examined via de-colorization of methylene blue under: (1) direct natural sunlight, and (2) artificial UV irradiation. In both cases enhanced photocatalytic activity of ZnO/SnO2 has been found. Enhanced photocatalytic activity can be attributed to the surface defects and to created ZnO/SnO2 heterojunctions which reduced electron-hole recombination time.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017
T1  - Enhanced natural sunlight- and artificial UV-driven photocatalytic activity of mechanically activated ZnO/SnO2 composite
SP  - 49
EP  - 49
UR  - https://hdl.handle.net/21.15107/rcub_dais_15440
ER  - 
@conference{
author = "Marković, Smilja and Stanković, Ana and Dostanić, Jasmina and Mančić, Lidija and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2017",
abstract = "Over the past four decades there is an increasing interest to develop highly efficient semiconductor photocatalysts for degradation of organic and biological pollutants in water under light irradiation. The semiconductor band gap determines which wavelength of light will be absorbed; precisely, semiconductors with a wide band gap (> 3 eV) can absorb only UV light, while those with a narrow band gap (< 3 eV) can be activated by visible light.
In this study we examined structural, morphological, textural and optical properties of ZnO/SnO2 composite as potential photocatalyst. Mechanical activation of commercial ZnO and SnO2 powders has been used to produce a composite with high density of surface defects. To investigate the influence of thermal treatment on the physical properties, and consequently on photoactivity, the composite has been traditionally annealed at 400 and 700 °C. The phase purity, crystal structure and average crystallite size of pristine metal oxides and the composites were investigated by X-ray diffraction and Raman spectroscopy. The particles morphology and size distributions were studied by FE–SEM and laser diffraction particle size analyzer, respectively. The textural properties were determined from N¬2¬ adsorption/desorption experiments, while the optical properties were studied using UV–Vis diffuse reflectance and photoluminescence spectroscopy. Photocatalytic activity of pristine ZnO and ZnO/SnO2 composites were examined via de-colorization of methylene blue under: (1) direct natural sunlight, and (2) artificial UV irradiation. In both cases enhanced photocatalytic activity of ZnO/SnO2 has been found. Enhanced photocatalytic activity can be attributed to the surface defects and to created ZnO/SnO2 heterojunctions which reduced electron-hole recombination time.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017",
title = "Enhanced natural sunlight- and artificial UV-driven photocatalytic activity of mechanically activated ZnO/SnO2 composite",
pages = "49-49",
url = "https://hdl.handle.net/21.15107/rcub_dais_15440"
}
Marković, S., Stanković, A., Dostanić, J., Mančić, L., Škapin, S. D.,& Uskoković, D.. (2017). Enhanced natural sunlight- and artificial UV-driven photocatalytic activity of mechanically activated ZnO/SnO2 composite. in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017
Belgrade : Materials Research Society of Serbia., 49-49.
https://hdl.handle.net/21.15107/rcub_dais_15440
Marković S, Stanković A, Dostanić J, Mančić L, Škapin SD, Uskoković D. Enhanced natural sunlight- and artificial UV-driven photocatalytic activity of mechanically activated ZnO/SnO2 composite. in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017. 2017;:49-49.
https://hdl.handle.net/21.15107/rcub_dais_15440 .
Marković, Smilja, Stanković, Ana, Dostanić, Jasmina, Mančić, Lidija, Škapin, Srečo Davor, Uskoković, Dragan, "Enhanced natural sunlight- and artificial UV-driven photocatalytic activity of mechanically activated ZnO/SnO2 composite" in Programme and The Book of Abstracts / Nineteenth Annual Conference YUCOMAT 2017, Herceg Novi, September 4-8, 2017 (2017):49-49,
https://hdl.handle.net/21.15107/rcub_dais_15440 .

PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity

Stanković, Ana; Sezen, Meltem; Milenković, Marina; Kaišarević, Sonja; Andrić, Nebojša; Stevanović, Magdalena

(Hindawi, 2016)

TY  - JOUR
AU  - Stanković, Ana
AU  - Sezen, Meltem
AU  - Milenković, Marina
AU  - Kaišarević, Sonja
AU  - Andrić, Nebojša
AU  - Stevanović, Magdalena
PY  - 2016
UR  - http://dais.sanu.ac.rs/123456789/901
AB  - Copolymer poly (DL-lactide-co-glycolide) (PLGA) is extensively investigated for various biomedical applications such as controlled drug delivery or carriers in the tissue engineering. In addition, zinc oxide (ZnO) is widely used in biomedicine especially for materials like dental composites, as a constituent of creams for the treatment of a variety of skin irritations, to enhance the antibacterial activity of different medicaments and so on. Uniform, spherical ZnO nanoparticles (nano-ZnO) have been synthesized via microwave synthesis method. In addition to obtaining nano-ZnO, a further aim was to examine their immobilization in the PLGA polymer matrix (PLGA/nano-ZnO) and this was done by a simple physicochemical solvent/nonsolvent method. The samples were characterized by X-ray diffraction, scanning electron microscopy, laser diffraction particle size analyzer, differential thermal analysis, and thermal gravimetric analysis. The synthesized PLGA/nano-ZnO particles are spherical, uniform, and with diameters below 1 µm. The influence of the different solvents and the drying methods during the synthesis was investigated too. The biocompatibility of the samples is discussed in terms of in vitro toxicity on human hepatoma HepG2 cells by application of MTT assay and the antimicrobial activity was evaluated by broth microdilution method against different groups of microorganisms (Gram-positive bacteria, Gram-negative bacteria, and yeast Candida albicans).
PB  - Hindawi
T2  - Journal of Nanomaterials
T1  - PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity
SP  - 9425289
VL  - 2016
DO  - 10.1155/2016/9425289
UR  - https://hdl.handle.net/21.15107/rcub_dais_901
ER  - 
@article{
author = "Stanković, Ana and Sezen, Meltem and Milenković, Marina and Kaišarević, Sonja and Andrić, Nebojša and Stevanović, Magdalena",
year = "2016",
abstract = "Copolymer poly (DL-lactide-co-glycolide) (PLGA) is extensively investigated for various biomedical applications such as controlled drug delivery or carriers in the tissue engineering. In addition, zinc oxide (ZnO) is widely used in biomedicine especially for materials like dental composites, as a constituent of creams for the treatment of a variety of skin irritations, to enhance the antibacterial activity of different medicaments and so on. Uniform, spherical ZnO nanoparticles (nano-ZnO) have been synthesized via microwave synthesis method. In addition to obtaining nano-ZnO, a further aim was to examine their immobilization in the PLGA polymer matrix (PLGA/nano-ZnO) and this was done by a simple physicochemical solvent/nonsolvent method. The samples were characterized by X-ray diffraction, scanning electron microscopy, laser diffraction particle size analyzer, differential thermal analysis, and thermal gravimetric analysis. The synthesized PLGA/nano-ZnO particles are spherical, uniform, and with diameters below 1 µm. The influence of the different solvents and the drying methods during the synthesis was investigated too. The biocompatibility of the samples is discussed in terms of in vitro toxicity on human hepatoma HepG2 cells by application of MTT assay and the antimicrobial activity was evaluated by broth microdilution method against different groups of microorganisms (Gram-positive bacteria, Gram-negative bacteria, and yeast Candida albicans).",
publisher = "Hindawi",
journal = "Journal of Nanomaterials",
title = "PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity",
pages = "9425289",
volume = "2016",
doi = "10.1155/2016/9425289",
url = "https://hdl.handle.net/21.15107/rcub_dais_901"
}
Stanković, A., Sezen, M., Milenković, M., Kaišarević, S., Andrić, N.,& Stevanović, M.. (2016). PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity. in Journal of Nanomaterials
Hindawi., 2016, 9425289.
https://doi.org/10.1155/2016/9425289
https://hdl.handle.net/21.15107/rcub_dais_901
Stanković A, Sezen M, Milenković M, Kaišarević S, Andrić N, Stevanović M. PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity. in Journal of Nanomaterials. 2016;2016:9425289.
doi:10.1155/2016/9425289
https://hdl.handle.net/21.15107/rcub_dais_901 .
Stanković, Ana, Sezen, Meltem, Milenković, Marina, Kaišarević, Sonja, Andrić, Nebojša, Stevanović, Magdalena, "PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity" in Journal of Nanomaterials, 2016 (2016):9425289,
https://doi.org/10.1155/2016/9425289 .,
https://hdl.handle.net/21.15107/rcub_dais_901 .
7
8
9

Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites

Marković, Smilja; Rajić, Vladimir B.; Stanković, Ana; Veselinović, Ljiljana; Belošević Čavor, Jelena; Batalović, Katarina; Abazović, Nadica; Škapin, Srečo Davor; Uskoković, Dragan

(Elsevier, 2016)

TY  - JOUR
AU  - Marković, Smilja
AU  - Rajić, Vladimir B.
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Belošević Čavor, Jelena
AU  - Batalović, Katarina
AU  - Abazović, Nadica
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2016
UR  - http://dais.sanu.ac.rs/123456789/2317
AB  - ZnO spheroidal nanoparticles, synthesized by microwave processing, were used for preparation of composites with polyethylene oxide (PEO). The phase purity and crystal structure of the composites were investigated by X-ray diffraction (XRD) and Raman spectroscopy. The composites’ particles morphology and size distributions were studied by FE-SEM and laser diffraction particle size analyzer, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence spectroscopy. It is found that in the wavelength range 550–800 nm, ZnO and ZnO/PEO composites absorb about 50% of the incident light intensity. Also red-shift of band gap energy (0.12–0.15 eV) compared to bulk ZnO was determined. The effect of PEO molecular weights, 200,000, 600,000 and 900,000 g/mol, on photocatalytic activity of ZnO/PEO composites were examined via de-colorization of methylene blue (MB) under direct sunlight irradiation. A large efficiency of MB de-colorization was found after 6 h of irradiation. The enhanced photocatalytic activity of ZnO/PEO composites is attributed to the: (1) lattice defects introduced in ZnO crystal structure by rapid microwave processing, and (2) presence of PEO as a source of oxygen interstitials. In order to confirm and further clarify the experimental results ab initio calculations based on density functional theory (DFT) were performed.
PB  - Elsevier
T2  - Solar Energy
T1  - Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites
SP  - 124
EP  - 135
VL  - 127
DO  - 10.1016/j.solener.2016.01.026
UR  - https://hdl.handle.net/21.15107/rcub_dais_2317
ER  - 
@article{
author = "Marković, Smilja and Rajić, Vladimir B. and Stanković, Ana and Veselinović, Ljiljana and Belošević Čavor, Jelena and Batalović, Katarina and Abazović, Nadica and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2016",
abstract = "ZnO spheroidal nanoparticles, synthesized by microwave processing, were used for preparation of composites with polyethylene oxide (PEO). The phase purity and crystal structure of the composites were investigated by X-ray diffraction (XRD) and Raman spectroscopy. The composites’ particles morphology and size distributions were studied by FE-SEM and laser diffraction particle size analyzer, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence spectroscopy. It is found that in the wavelength range 550–800 nm, ZnO and ZnO/PEO composites absorb about 50% of the incident light intensity. Also red-shift of band gap energy (0.12–0.15 eV) compared to bulk ZnO was determined. The effect of PEO molecular weights, 200,000, 600,000 and 900,000 g/mol, on photocatalytic activity of ZnO/PEO composites were examined via de-colorization of methylene blue (MB) under direct sunlight irradiation. A large efficiency of MB de-colorization was found after 6 h of irradiation. The enhanced photocatalytic activity of ZnO/PEO composites is attributed to the: (1) lattice defects introduced in ZnO crystal structure by rapid microwave processing, and (2) presence of PEO as a source of oxygen interstitials. In order to confirm and further clarify the experimental results ab initio calculations based on density functional theory (DFT) were performed.",
publisher = "Elsevier",
journal = "Solar Energy",
title = "Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites",
pages = "124-135",
volume = "127",
doi = "10.1016/j.solener.2016.01.026",
url = "https://hdl.handle.net/21.15107/rcub_dais_2317"
}
Marković, S., Rajić, V. B., Stanković, A., Veselinović, L., Belošević Čavor, J., Batalović, K., Abazović, N., Škapin, S. D.,& Uskoković, D.. (2016). Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites. in Solar Energy
Elsevier., 127, 124-135.
https://doi.org/10.1016/j.solener.2016.01.026
https://hdl.handle.net/21.15107/rcub_dais_2317
Marković S, Rajić VB, Stanković A, Veselinović L, Belošević Čavor J, Batalović K, Abazović N, Škapin SD, Uskoković D. Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites. in Solar Energy. 2016;127:124-135.
doi:10.1016/j.solener.2016.01.026
https://hdl.handle.net/21.15107/rcub_dais_2317 .
Marković, Smilja, Rajić, Vladimir B., Stanković, Ana, Veselinović, Ljiljana, Belošević Čavor, Jelena, Batalović, Katarina, Abazović, Nadica, Škapin, Srečo Davor, Uskoković, Dragan, "Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites" in Solar Energy, 127 (2016):124-135,
https://doi.org/10.1016/j.solener.2016.01.026 .,
https://hdl.handle.net/21.15107/rcub_dais_2317 .
8
10
10

Influence of Point Defects Concentration on Densification Process and Optical Properties of Sintered ZnO Ceramics

Marković, Smilja; Stanković, Ana; Veselinović, Ljiljana; Belošević Čavor, Jelena; Škapin, Srečo Davor; Stojadinović, Stevan; Rac, Vladislav; Lević, Steva; Janković Častvan, Ivona; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2015)

TY  - CONF
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Belošević Čavor, Jelena
AU  - Škapin, Srečo Davor
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Lević, Steva
AU  - Janković Častvan, Ivona
AU  - Uskoković, Dragan
PY  - 2015
UR  - http://dais.sanu.ac.rs/123456789/831
AB  - Zinc oxide is one of the most studied materials due to its potential applications in electronics, optoelectronics and spintronics. In the forms of single crystal and thin-film ZnO could be used as UV and blue light emitter, while sintered ZnO-based ceramics are important as varistors, thermistors or wide-band gap semiconductors. Intrinsic defects, such as vacancies, interstitials and antisites, in the crystal structure of a ZnO strongly influenced its electrical and optical properties. Thus, understanding the behavior of intrinsic defects during densification of ZnO ceramics as well as correlation of the defects with band gap energy of final product is important to its application in opto-electronic devices.
In this study, the influence of point defects concentration on the densification process and optical properties of ZnO sintered ceramics was investigated. To obtain ZnO sintered ceramics with variety of point defects concentration we employed two starting powders with a different crystal structure ordering, as well different morphology and specific surface area. Sinterability of the powders was investigated by thermo mechanical analyzer; shrinkage data, collected in axial (h) direction during non-isothermal sintering with heating rates of 5, 10 and 20 °/min, were used to calculate activation energy of sintering process. Sintering of uniaxially pressed (P = 100 MPa) cylindrical compacts (ø 6 mm and h ≈ 3 mm) were done in air atmosphere by heating rate of 10 °/min up to 1100 and 1200 °C, and dwell time of 2 h. To study a crystal structure of the sintered samples XRD and Raman spectroscopy were used, for microstructural investigation field emission scanning electron micrographs were recorded while optical properties were determined by UV-Vis diffuse reflectance and photoluminescence spectroscopy. A detailed study shows that point defect strongly influenced densification process as well optical properties. Sintered ZnO ceramic with a high crystal defect concentration and nanosized grains shows band gap energy of about 2 eV while band gap energy increased with a decrease of defect concentration.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August 31– September 4, 2015
T1  - Influence of Point Defects Concentration on Densification Process and Optical Properties of Sintered ZnO Ceramics
SP  - 61
EP  - 61
UR  - https://hdl.handle.net/21.15107/rcub_dais_831
ER  - 
@conference{
author = "Marković, Smilja and Stanković, Ana and Veselinović, Ljiljana and Belošević Čavor, Jelena and Škapin, Srečo Davor and Stojadinović, Stevan and Rac, Vladislav and Lević, Steva and Janković Častvan, Ivona and Uskoković, Dragan",
year = "2015",
abstract = "Zinc oxide is one of the most studied materials due to its potential applications in electronics, optoelectronics and spintronics. In the forms of single crystal and thin-film ZnO could be used as UV and blue light emitter, while sintered ZnO-based ceramics are important as varistors, thermistors or wide-band gap semiconductors. Intrinsic defects, such as vacancies, interstitials and antisites, in the crystal structure of a ZnO strongly influenced its electrical and optical properties. Thus, understanding the behavior of intrinsic defects during densification of ZnO ceramics as well as correlation of the defects with band gap energy of final product is important to its application in opto-electronic devices.
In this study, the influence of point defects concentration on the densification process and optical properties of ZnO sintered ceramics was investigated. To obtain ZnO sintered ceramics with variety of point defects concentration we employed two starting powders with a different crystal structure ordering, as well different morphology and specific surface area. Sinterability of the powders was investigated by thermo mechanical analyzer; shrinkage data, collected in axial (h) direction during non-isothermal sintering with heating rates of 5, 10 and 20 °/min, were used to calculate activation energy of sintering process. Sintering of uniaxially pressed (P = 100 MPa) cylindrical compacts (ø 6 mm and h ≈ 3 mm) were done in air atmosphere by heating rate of 10 °/min up to 1100 and 1200 °C, and dwell time of 2 h. To study a crystal structure of the sintered samples XRD and Raman spectroscopy were used, for microstructural investigation field emission scanning electron micrographs were recorded while optical properties were determined by UV-Vis diffuse reflectance and photoluminescence spectroscopy. A detailed study shows that point defect strongly influenced densification process as well optical properties. Sintered ZnO ceramic with a high crystal defect concentration and nanosized grains shows band gap energy of about 2 eV while band gap energy increased with a decrease of defect concentration.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August 31– September 4, 2015",
title = "Influence of Point Defects Concentration on Densification Process and Optical Properties of Sintered ZnO Ceramics",
pages = "61-61",
url = "https://hdl.handle.net/21.15107/rcub_dais_831"
}
Marković, S., Stanković, A., Veselinović, L., Belošević Čavor, J., Škapin, S. D., Stojadinović, S., Rac, V., Lević, S., Janković Častvan, I.,& Uskoković, D.. (2015). Influence of Point Defects Concentration on Densification Process and Optical Properties of Sintered ZnO Ceramics. in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August 31– September 4, 2015
Belgrade : Materials Research Society of Serbia., 61-61.
https://hdl.handle.net/21.15107/rcub_dais_831
Marković S, Stanković A, Veselinović L, Belošević Čavor J, Škapin SD, Stojadinović S, Rac V, Lević S, Janković Častvan I, Uskoković D. Influence of Point Defects Concentration on Densification Process and Optical Properties of Sintered ZnO Ceramics. in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August 31– September 4, 2015. 2015;:61-61.
https://hdl.handle.net/21.15107/rcub_dais_831 .
Marković, Smilja, Stanković, Ana, Veselinović, Ljiljana, Belošević Čavor, Jelena, Škapin, Srečo Davor, Stojadinović, Stevan, Rac, Vladislav, Lević, Steva, Janković Častvan, Ivona, Uskoković, Dragan, "Influence of Point Defects Concentration on Densification Process and Optical Properties of Sintered ZnO Ceramics" in Programme and The Book of Abstracts / Seventeenth Annual Conference YUCOMAT 205, Herceg Novi, August 31– September 4, 2015 (2015):61-61,
https://hdl.handle.net/21.15107/rcub_dais_831 .

Synthesis of PLGA /nano-ZnO composite particles for biomedical applications

Stanković, Ana; Lukić, Miodrag J.; Jović, Maja; Sezen, Meltem; Milenković, Marina; Stevanović, Magdalena

(Rovinj : International Association of Physical Chemists, 2015)

TY  - CONF
AU  - Stanković, Ana
AU  - Lukić, Miodrag J.
AU  - Jović, Maja
AU  - Sezen, Meltem
AU  - Milenković, Marina
AU  - Stevanović, Magdalena
PY  - 2015
UR  - http://dais.sanu.ac.rs/123456789/857
AB  - Copolymer poly (DL-lactide-co-glycolide) (PLGA), due of its biodegradable and biocompatible nature, is widely used in various medical applications; controlled release of delivering drugs, carriers in the tissue engineering, etc. On the other hand, zinc oxide (ZnO) is extensively used in medicine and pharmacy for personal care products, as well as in biomedical materials like dental composites, as a material for treatment of a variety of skin irritations, to enhance the antibacterial activity of different medicaments, etc. In this research we have dealt with a procedure to prepare particles of poly (lactide-co-glycolide) and nano zinc oxide (PLGA/nano-ZnO). Nano-ZnO has been synthesized using a microwave synthesis method and additionally immobilized within PLGA by physicochemical solvent/non-solvent method. Firstly, ZnO has been dispersed in acetone and then additionally added dropwise in the PLGA/ethyl acetate (PLGA/nano-ZnO(EtAc) or PLGA/acetone (PLGA/nano-ZnO(Ac)) solutions, respectively. The as-prepared dispersions were dried in air atmosphere for 24 h. 
The characterization of the prepared samples was performed using X-ray powder diffraction (XRPD) method for the structure properties, field emission scanning electron microscopy (FE SEM) for the investigation of particles morphology, as well as Malvern’s Mastersizer instrument for particle size distribution. DTA-TG measurements were performed in order to investigate the samples thermal stability and mass loss percentage. The antimicrobial behavior of the synthesized PLGA/nano-ZnO particles was tested against gram-negative and gram-positive bacteria cultures and also against Candida Albicans, diploid fungus.
PB  - Rovinj : International Association of Physical Chemists
C3  - Joint Event 4th World Conference on Physico-Chemical Methods in Drug Discovery and Development (PCMDDD-4) and 1st World Conference on ADMET and DMPK
T1  - Synthesis of PLGA /nano-ZnO composite particles for biomedical applications
UR  - https://hdl.handle.net/21.15107/rcub_dais_857
ER  - 
@conference{
author = "Stanković, Ana and Lukić, Miodrag J. and Jović, Maja and Sezen, Meltem and Milenković, Marina and Stevanović, Magdalena",
year = "2015",
abstract = "Copolymer poly (DL-lactide-co-glycolide) (PLGA), due of its biodegradable and biocompatible nature, is widely used in various medical applications; controlled release of delivering drugs, carriers in the tissue engineering, etc. On the other hand, zinc oxide (ZnO) is extensively used in medicine and pharmacy for personal care products, as well as in biomedical materials like dental composites, as a material for treatment of a variety of skin irritations, to enhance the antibacterial activity of different medicaments, etc. In this research we have dealt with a procedure to prepare particles of poly (lactide-co-glycolide) and nano zinc oxide (PLGA/nano-ZnO). Nano-ZnO has been synthesized using a microwave synthesis method and additionally immobilized within PLGA by physicochemical solvent/non-solvent method. Firstly, ZnO has been dispersed in acetone and then additionally added dropwise in the PLGA/ethyl acetate (PLGA/nano-ZnO(EtAc) or PLGA/acetone (PLGA/nano-ZnO(Ac)) solutions, respectively. The as-prepared dispersions were dried in air atmosphere for 24 h. 
The characterization of the prepared samples was performed using X-ray powder diffraction (XRPD) method for the structure properties, field emission scanning electron microscopy (FE SEM) for the investigation of particles morphology, as well as Malvern’s Mastersizer instrument for particle size distribution. DTA-TG measurements were performed in order to investigate the samples thermal stability and mass loss percentage. The antimicrobial behavior of the synthesized PLGA/nano-ZnO particles was tested against gram-negative and gram-positive bacteria cultures and also against Candida Albicans, diploid fungus.",
publisher = "Rovinj : International Association of Physical Chemists",
journal = "Joint Event 4th World Conference on Physico-Chemical Methods in Drug Discovery and Development (PCMDDD-4) and 1st World Conference on ADMET and DMPK",
title = "Synthesis of PLGA /nano-ZnO composite particles for biomedical applications",
url = "https://hdl.handle.net/21.15107/rcub_dais_857"
}
Stanković, A., Lukić, M. J., Jović, M., Sezen, M., Milenković, M.,& Stevanović, M.. (2015). Synthesis of PLGA /nano-ZnO composite particles for biomedical applications. in Joint Event 4th World Conference on Physico-Chemical Methods in Drug Discovery and Development (PCMDDD-4) and 1st World Conference on ADMET and DMPK
Rovinj : International Association of Physical Chemists..
https://hdl.handle.net/21.15107/rcub_dais_857
Stanković A, Lukić MJ, Jović M, Sezen M, Milenković M, Stevanović M. Synthesis of PLGA /nano-ZnO composite particles for biomedical applications. in Joint Event 4th World Conference on Physico-Chemical Methods in Drug Discovery and Development (PCMDDD-4) and 1st World Conference on ADMET and DMPK. 2015;.
https://hdl.handle.net/21.15107/rcub_dais_857 .
Stanković, Ana, Lukić, Miodrag J., Jović, Maja, Sezen, Meltem, Milenković, Marina, Stevanović, Magdalena, "Synthesis of PLGA /nano-ZnO composite particles for biomedical applications" in Joint Event 4th World Conference on Physico-Chemical Methods in Drug Discovery and Development (PCMDDD-4) and 1st World Conference on ADMET and DMPK (2015),
https://hdl.handle.net/21.15107/rcub_dais_857 .

Application of raw peach shell particles for removal of methylene blue

Marković, Smilja; Stanković, Ana; Lopičić, Zorica; Lazarević, Slavica; Stojanović, Mirjana; Uskoković, Dragan

(Elsevier, 2015)

TY  - JOUR
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Lopičić, Zorica
AU  - Lazarević, Slavica
AU  - Stojanović, Mirjana
AU  - Uskoković, Dragan
PY  - 2015
UR  - http://dais.sanu.ac.rs/123456789/3524
AB  - A possibility to apply raw, powdered peach shells (PS) as a biosorbent for water purification was studied. The PSs are locally available as a solid waste in a fruit juice factory; methylene blue (MB) was chosen as representative of common pollutants in textile industry wastewater. The phase composition of prepared particles was identified by XRD. The particle morphology was characterized by FE-SEM, while the size distribution was measured by a laser light-scattering particle size analyzer. The BET specific surface area was determined from N2 adsorption/desorption experiments. The effect of operating parameters: the biosorbent amount (50-1000 mg/100 mL), contact time (10-180 min), solution pH (2-12) and initial concentration (10-100 ppm) on biosorption efficiency was examined. Optimal conditions for MB removal were found to be: the biosorbent amount of 400 mg/100 mL and pH 5.5. A high efficiency of MB removal was established after 180 min: 99% for [MB]i = 10 ppm and 76% for [MB]i = 100 ppm. Biosorption is well described by the Freundlich- and BET-type isotherms, implicating heterogeneous adsorption sites and interconnections between adsorbed molecules. The FTIR spectroscopy results indicate hydrogen bonding between the dye and the biomass. The obtained results shown that raw peach shell particles could be used as an efficient low-cost biosorbent for dye removal from water. © 2015 Elsevier Ltd.
PB  - Elsevier
T2  - Journal of Environmental Chemical Engineering
T1  - Application of raw peach shell particles for removal of methylene blue
SP  - 716
EP  - 724
VL  - 3
IS  - 2
DO  - 10.1016/j.jece.2015.04.002
UR  - https://hdl.handle.net/21.15107/rcub_dais_3524
ER  - 
@article{
author = "Marković, Smilja and Stanković, Ana and Lopičić, Zorica and Lazarević, Slavica and Stojanović, Mirjana and Uskoković, Dragan",
year = "2015",
abstract = "A possibility to apply raw, powdered peach shells (PS) as a biosorbent for water purification was studied. The PSs are locally available as a solid waste in a fruit juice factory; methylene blue (MB) was chosen as representative of common pollutants in textile industry wastewater. The phase composition of prepared particles was identified by XRD. The particle morphology was characterized by FE-SEM, while the size distribution was measured by a laser light-scattering particle size analyzer. The BET specific surface area was determined from N2 adsorption/desorption experiments. The effect of operating parameters: the biosorbent amount (50-1000 mg/100 mL), contact time (10-180 min), solution pH (2-12) and initial concentration (10-100 ppm) on biosorption efficiency was examined. Optimal conditions for MB removal were found to be: the biosorbent amount of 400 mg/100 mL and pH 5.5. A high efficiency of MB removal was established after 180 min: 99% for [MB]i = 10 ppm and 76% for [MB]i = 100 ppm. Biosorption is well described by the Freundlich- and BET-type isotherms, implicating heterogeneous adsorption sites and interconnections between adsorbed molecules. The FTIR spectroscopy results indicate hydrogen bonding between the dye and the biomass. The obtained results shown that raw peach shell particles could be used as an efficient low-cost biosorbent for dye removal from water. © 2015 Elsevier Ltd.",
publisher = "Elsevier",
journal = "Journal of Environmental Chemical Engineering",
title = "Application of raw peach shell particles for removal of methylene blue",
pages = "716-724",
volume = "3",
number = "2",
doi = "10.1016/j.jece.2015.04.002",
url = "https://hdl.handle.net/21.15107/rcub_dais_3524"
}
Marković, S., Stanković, A., Lopičić, Z., Lazarević, S., Stojanović, M.,& Uskoković, D.. (2015). Application of raw peach shell particles for removal of methylene blue. in Journal of Environmental Chemical Engineering
Elsevier., 3(2), 716-724.
https://doi.org/10.1016/j.jece.2015.04.002
https://hdl.handle.net/21.15107/rcub_dais_3524
Marković S, Stanković A, Lopičić Z, Lazarević S, Stojanović M, Uskoković D. Application of raw peach shell particles for removal of methylene blue. in Journal of Environmental Chemical Engineering. 2015;3(2):716-724.
doi:10.1016/j.jece.2015.04.002
https://hdl.handle.net/21.15107/rcub_dais_3524 .
Marković, Smilja, Stanković, Ana, Lopičić, Zorica, Lazarević, Slavica, Stojanović, Mirjana, Uskoković, Dragan, "Application of raw peach shell particles for removal of methylene blue" in Journal of Environmental Chemical Engineering, 3, no. 2 (2015):716-724,
https://doi.org/10.1016/j.jece.2015.04.002 .,
https://hdl.handle.net/21.15107/rcub_dais_3524 .
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Korelacija funkcionalnih i fizičko-hemijskih svojstava prahova ZnO dobijenih različitim metodama sinteze

Stanković, Ana

(Belgrade : University of Belgrade, Faculty of Physical Chemistry, 2014)

TY  - THES
AU  - Stanković, Ana
PY  - 2014
UR  - http://dais.sanu.ac.rs/123456789/579
AB  - Poznato je da funkcionalna svojstva cink oksidnih prahova zavise od fizičko-hemijskih karakteristika kao što su optičke karakteristike i specifična površina, a koje su određene strukturnim svojstvima praha u kao što su: fazni sastav, veličina kristalita, stepen kristaliničnosti, uređenje kristalne strukture tj. prisustvo defekata kao i morfologija čestica. Navedene karakteristike mogu se podešavati optimizacijom reakcionih uslova tokom procesa sinteze. Cilj ovog istraživanja bio je, kao prvo, sinteza prahova ZnO različitih fizičko-hemijskih karakteristika putem optimizacije reakcionih uslova različitih metoda procesiranja. Nakon toga, ideja je bila da se ispitaju neka od funkcionalnih svojstava sintetisanih prahova ZnO, konkretno, katalitička i antibakterijska svojstva. Konačno, uspostavljena je korelacija između ispitivanih funkcionalnih svojstava i fizičko-hemijskih karakteristika sintetisanih prahova ZnO.
U ovom radu primenjena su tri postupka sinteze: hidrotermalno, ultrazvučno i mikrotalasno procesiranje. U slučaju hidrotermalnog procesiranja, promenom pH vrednosti reakcionog sistema, od slabo bazne (pH 8) do jako bazne (pH 12) sredine, uz prisustvo određene količine površinski aktivne komponente, bilo je moguće značajno modifikovati morfologiju i srednju veličinu čestica sintetisanih prahova ZnO. Sintetisane su čestice od štapićastih mikrometarskih formi, pri pH vrednosti reakcionog sistema 8-10, preko elipsoidnih submikrometarskih oblika pri pH 11, do sferičnih nanometarskih čestica pri pH 12-13. Ispitan je i uticaj energije, koja se tokom ultrazvučnog i mikrotalasnog procesiranja unosi u reakcioni sistem, na morfologiju čestica ZnO; zadržani su identični reakcioni uslovi kao i u slučaju hidrotermalnog procesiranja. Utvrđeno je da energija primenjenog spoljašnjeg polja (ultazvučnog ili mikrotalasnog) u značajnoj meri utiče na morfologiju čestica, uređenost strukure i defekte rešetke u molekulu ZnO, što doprinosi poboljšanju ispitivanih funkcionalnih svojstava materijala.
Ispitana su optička svojstva sintetisanih prahova ZnO, tačnije, uspostavljena je korelacija između oblika i srednje veličine čestica sa jedne strane i procenta refleksije i energije procepa sa druge strane. Utvrđeno je da se modifikacijom oblika i dimenzija čestica značajno mogu poboljšati optička svojstva ZnO u vidljivom delu spektra.
Primenom postupaka heterogene fotokatalize i sonokatalize za razgradnju organske boje metilensko plavo (MB), ispitana su katalitička svojstva prahova ZnO. S obzirom da su sintetisani prahovi čija je energija procepa u vidljivom delu spektra (Ebg=3,25 eV) bilo je moguće povećati efikasnost razgradnje toksične boje (MB) u prisustvu ZnO prahova dodatnim delovanjem svetlosti (fotokataliza) tokom eksperimenata. Delovanjem ultrazvučnog polja (sonokataliza) tokom procesa razgradnje boje MB u prisustvu praha ZnO uočeno je značajno povećanje efikasnosti. U oba slučaja, foto- i sono-katalize, postignuta je dodatna aktivacija čestica ZnO tj. ubrzano je oslobađanje peroksidnih radikala što je za rezultat imalo i visok procenat efikasnosti razgradnje organske boje u ispitivanim disperzijama.
Antibakterijska svojstva sintetisanih prahova cink oksida ispitivana su na dve bakterijske ćelijske vrste, gram pozitivne Staphylococcus aureus i gram negativne Escherichia coli. Utvrđeno je da prah ZnO izgrađen od nanosfernih čestica, relativno velike specifične površine, pokazuje najveći procenat redukcije broja živih ćelija tj. najbolju antibakterijsku aktivnost u slučaju ćelija Escherichia coli, dok je najbolju antibakterijsku aktivnost u slučaju ćelija Staphylococcus aureus pokazao prah ZnO izgrađen od heksagonalnih mikronskih štapićastih formi. Ovi rezultati potvrdili su da osim veličine i morfologije čestica na antibakterijsku aktivnost ispitivanog uzorka utiče niz faktora od kojih se posebno ističe vrsta i svojstva bakterijske linije koja se proučava.
AB  - It is known that the functional properties of zinc oxide powders depend on their physico-chemical properties, such as optical properties and specific surface area wich are defined with structural characteristics for example: the particle size and morphology, phase composition, crystallite size, crystallinity degree, as well as the crystal structure ordering, i.e. the presence of defects. All of these characteristics can be designed by optimizing the reaction conditions during the synthesis. The primary purpose of this study is to synthesize zinc oxide powders with various physico-chemical properties by optimizing the reaction conditions in different processing methods. Furthermore, the aim was to test some of the functional properties of the synthesized ZnO powders – namely, their catalytic and antibacterial properties. Finally, a correlation between the tested functional properties and physico-chemical characteristics of the synthesized ZnO powders has been established.
In this thesis, three methods of synthesis have been applied: hydrothermal, ultrasound and microwave processing. In the case of hydrothermal processing it is possible to significantly alter the morphology and the average particle size of the synthesized ZnO particles by changing the pH value of the reaction system, from a weak base (pH 8) to a very strong base (pH 12), in the presence of an amount of surface-active agents. The synthesized particles ranged from rod-shaped micrometer-sized forms at the pH 8–10 reaction system, over submicron ellipsoidal shapes at pH 11, down to the spherical nano-scaled particles obtained at a pH 12–13. The impact of energy introduced into the reaction system during sonochemical and microwave processing on the morphology of ZnO particles has also been examined under the identical reaction conditions as in hydrothermal processing. It has been found that the energy of the applied external field (ultrasound or microwave) considerably affects the particle morphology, the order of the structure and the lattice defects in the ZnO molecule, which contributes improuvement of the tested functional properties of the material.
The optical properties of the synthesized powders have been examined; more precisely, the correlation between the shape and the average particle size as well as the reflection percentage and band gap energy has been established. It has been demonstrated that the modification of the particle shape and dimensions can significantly improve the optical properties of ZnO in the visible spectrum.
The catalytic properties of ZnO powders have been investigated by heterogeneous photocatalytic and sonocatalytic degradation of an organic dye, methylene blue (MB). Having in mind that the synthesized powders whose energy gaps are in the visible spectrum (Ebg = 3.25 eV), it is possible to increase the efficiency of the degradation of the toxic dye (MB) in the presence of ZnO powders by an additional exsposure to the light (photocatalysis) during the experiments. When an ultrasonic field (sonocatalysis) is applied during the decomposition process of MB in the presence of a ZnO powder, a significant increase in efficiency is observed. In both cases, photo- and sonocatalysis, an additional activation of ZnO particles, i.e. an accelerated release of peroxide radicals is observed, which results in a high efficiency of the degradation of the organic dye in the tested dispersions.
The antibacterial properties of the synthesized ZnO powders were tested on two types of bacterial cells, gram positive – Staphylococcus aureus and gram – negative Escherichia coli. It has been found that the ZnO powder consisting of nanospherical particles with a relatively large specific surface area, shows the greatest percentage of the reduction in the number of viable cells, i.e. the best antibacterial activity in the case of Escherichia coli cells, while the best antibacterial activity in the case of Staphylococcus aureus cells was exhibited by the ZnO powder consisting of hexagonal ZnO micron-sized rod-like forms. These results have confirmed that in addition to particle size and morphology, the antibacterial activity of the examined sample is influenced by a number of factors; particularly important among them are the type and properties of the investigated bacterial lines.
PB  - Belgrade : University of Belgrade, Faculty of Physical Chemistry
T1  - Korelacija funkcionalnih i fizičko-hemijskih svojstava prahova ZnO dobijenih različitim metodama sinteze
UR  - https://hdl.handle.net/21.15107/rcub_dais_579
ER  - 
@phdthesis{
author = "Stanković, Ana",
year = "2014",
abstract = "Poznato je da funkcionalna svojstva cink oksidnih prahova zavise od fizičko-hemijskih karakteristika kao što su optičke karakteristike i specifična površina, a koje su određene strukturnim svojstvima praha u kao što su: fazni sastav, veličina kristalita, stepen kristaliničnosti, uređenje kristalne strukture tj. prisustvo defekata kao i morfologija čestica. Navedene karakteristike mogu se podešavati optimizacijom reakcionih uslova tokom procesa sinteze. Cilj ovog istraživanja bio je, kao prvo, sinteza prahova ZnO različitih fizičko-hemijskih karakteristika putem optimizacije reakcionih uslova različitih metoda procesiranja. Nakon toga, ideja je bila da se ispitaju neka od funkcionalnih svojstava sintetisanih prahova ZnO, konkretno, katalitička i antibakterijska svojstva. Konačno, uspostavljena je korelacija između ispitivanih funkcionalnih svojstava i fizičko-hemijskih karakteristika sintetisanih prahova ZnO.
U ovom radu primenjena su tri postupka sinteze: hidrotermalno, ultrazvučno i mikrotalasno procesiranje. U slučaju hidrotermalnog procesiranja, promenom pH vrednosti reakcionog sistema, od slabo bazne (pH 8) do jako bazne (pH 12) sredine, uz prisustvo određene količine površinski aktivne komponente, bilo je moguće značajno modifikovati morfologiju i srednju veličinu čestica sintetisanih prahova ZnO. Sintetisane su čestice od štapićastih mikrometarskih formi, pri pH vrednosti reakcionog sistema 8-10, preko elipsoidnih submikrometarskih oblika pri pH 11, do sferičnih nanometarskih čestica pri pH 12-13. Ispitan je i uticaj energije, koja se tokom ultrazvučnog i mikrotalasnog procesiranja unosi u reakcioni sistem, na morfologiju čestica ZnO; zadržani su identični reakcioni uslovi kao i u slučaju hidrotermalnog procesiranja. Utvrđeno je da energija primenjenog spoljašnjeg polja (ultazvučnog ili mikrotalasnog) u značajnoj meri utiče na morfologiju čestica, uređenost strukure i defekte rešetke u molekulu ZnO, što doprinosi poboljšanju ispitivanih funkcionalnih svojstava materijala.
Ispitana su optička svojstva sintetisanih prahova ZnO, tačnije, uspostavljena je korelacija između oblika i srednje veličine čestica sa jedne strane i procenta refleksije i energije procepa sa druge strane. Utvrđeno je da se modifikacijom oblika i dimenzija čestica značajno mogu poboljšati optička svojstva ZnO u vidljivom delu spektra.
Primenom postupaka heterogene fotokatalize i sonokatalize za razgradnju organske boje metilensko plavo (MB), ispitana su katalitička svojstva prahova ZnO. S obzirom da su sintetisani prahovi čija je energija procepa u vidljivom delu spektra (Ebg=3,25 eV) bilo je moguće povećati efikasnost razgradnje toksične boje (MB) u prisustvu ZnO prahova dodatnim delovanjem svetlosti (fotokataliza) tokom eksperimenata. Delovanjem ultrazvučnog polja (sonokataliza) tokom procesa razgradnje boje MB u prisustvu praha ZnO uočeno je značajno povećanje efikasnosti. U oba slučaja, foto- i sono-katalize, postignuta je dodatna aktivacija čestica ZnO tj. ubrzano je oslobađanje peroksidnih radikala što je za rezultat imalo i visok procenat efikasnosti razgradnje organske boje u ispitivanim disperzijama.
Antibakterijska svojstva sintetisanih prahova cink oksida ispitivana su na dve bakterijske ćelijske vrste, gram pozitivne Staphylococcus aureus i gram negativne Escherichia coli. Utvrđeno je da prah ZnO izgrađen od nanosfernih čestica, relativno velike specifične površine, pokazuje najveći procenat redukcije broja živih ćelija tj. najbolju antibakterijsku aktivnost u slučaju ćelija Escherichia coli, dok je najbolju antibakterijsku aktivnost u slučaju ćelija Staphylococcus aureus pokazao prah ZnO izgrađen od heksagonalnih mikronskih štapićastih formi. Ovi rezultati potvrdili su da osim veličine i morfologije čestica na antibakterijsku aktivnost ispitivanog uzorka utiče niz faktora od kojih se posebno ističe vrsta i svojstva bakterijske linije koja se proučava., It is known that the functional properties of zinc oxide powders depend on their physico-chemical properties, such as optical properties and specific surface area wich are defined with structural characteristics for example: the particle size and morphology, phase composition, crystallite size, crystallinity degree, as well as the crystal structure ordering, i.e. the presence of defects. All of these characteristics can be designed by optimizing the reaction conditions during the synthesis. The primary purpose of this study is to synthesize zinc oxide powders with various physico-chemical properties by optimizing the reaction conditions in different processing methods. Furthermore, the aim was to test some of the functional properties of the synthesized ZnO powders – namely, their catalytic and antibacterial properties. Finally, a correlation between the tested functional properties and physico-chemical characteristics of the synthesized ZnO powders has been established.
In this thesis, three methods of synthesis have been applied: hydrothermal, ultrasound and microwave processing. In the case of hydrothermal processing it is possible to significantly alter the morphology and the average particle size of the synthesized ZnO particles by changing the pH value of the reaction system, from a weak base (pH 8) to a very strong base (pH 12), in the presence of an amount of surface-active agents. The synthesized particles ranged from rod-shaped micrometer-sized forms at the pH 8–10 reaction system, over submicron ellipsoidal shapes at pH 11, down to the spherical nano-scaled particles obtained at a pH 12–13. The impact of energy introduced into the reaction system during sonochemical and microwave processing on the morphology of ZnO particles has also been examined under the identical reaction conditions as in hydrothermal processing. It has been found that the energy of the applied external field (ultrasound or microwave) considerably affects the particle morphology, the order of the structure and the lattice defects in the ZnO molecule, which contributes improuvement of the tested functional properties of the material.
The optical properties of the synthesized powders have been examined; more precisely, the correlation between the shape and the average particle size as well as the reflection percentage and band gap energy has been established. It has been demonstrated that the modification of the particle shape and dimensions can significantly improve the optical properties of ZnO in the visible spectrum.
The catalytic properties of ZnO powders have been investigated by heterogeneous photocatalytic and sonocatalytic degradation of an organic dye, methylene blue (MB). Having in mind that the synthesized powders whose energy gaps are in the visible spectrum (Ebg = 3.25 eV), it is possible to increase the efficiency of the degradation of the toxic dye (MB) in the presence of ZnO powders by an additional exsposure to the light (photocatalysis) during the experiments. When an ultrasonic field (sonocatalysis) is applied during the decomposition process of MB in the presence of a ZnO powder, a significant increase in efficiency is observed. In both cases, photo- and sonocatalysis, an additional activation of ZnO particles, i.e. an accelerated release of peroxide radicals is observed, which results in a high efficiency of the degradation of the organic dye in the tested dispersions.
The antibacterial properties of the synthesized ZnO powders were tested on two types of bacterial cells, gram positive – Staphylococcus aureus and gram – negative Escherichia coli. It has been found that the ZnO powder consisting of nanospherical particles with a relatively large specific surface area, shows the greatest percentage of the reduction in the number of viable cells, i.e. the best antibacterial activity in the case of Escherichia coli cells, while the best antibacterial activity in the case of Staphylococcus aureus cells was exhibited by the ZnO powder consisting of hexagonal ZnO micron-sized rod-like forms. These results have confirmed that in addition to particle size and morphology, the antibacterial activity of the examined sample is influenced by a number of factors; particularly important among them are the type and properties of the investigated bacterial lines.",
publisher = "Belgrade : University of Belgrade, Faculty of Physical Chemistry",
title = "Korelacija funkcionalnih i fizičko-hemijskih svojstava prahova ZnO dobijenih različitim metodama sinteze",
url = "https://hdl.handle.net/21.15107/rcub_dais_579"
}
Stanković, A.. (2014). Korelacija funkcionalnih i fizičko-hemijskih svojstava prahova ZnO dobijenih različitim metodama sinteze. 
Belgrade : University of Belgrade, Faculty of Physical Chemistry..
https://hdl.handle.net/21.15107/rcub_dais_579
Stanković A. Korelacija funkcionalnih i fizičko-hemijskih svojstava prahova ZnO dobijenih različitim metodama sinteze. 2014;.
https://hdl.handle.net/21.15107/rcub_dais_579 .
Stanković, Ana, "Korelacija funkcionalnih i fizičko-hemijskih svojstava prahova ZnO dobijenih različitim metodama sinteze" (2014),
https://hdl.handle.net/21.15107/rcub_dais_579 .

Photocatalytic activity of ZnO-PEO composites

Marković, Smilja; Rajić, Vladimir B.; Stanković, Ana; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2014)

TY  - CONF
AU  - Marković, Smilja
AU  - Rajić, Vladimir B.
AU  - Stanković, Ana
AU  - Uskoković, Dragan
PY  - 2014
UR  - http://dais.sanu.ac.rs/123456789/591
AB  - The removal of organic pollutants from wastewater is very important for environmental protection. During the years different methods have been developed and applied on wastewater treatment. Between those methods a heterogeneous photocatalysis has received extensive attention since it allows a complete mineralization of pollutants. ZnO-based materials has established role in heterogeneous photocatalysis. However, major drawback of ZnO is a band energy gap of 3.37 eV (368 nm) which restricts the material to absorb only UV light. Since sunlight is a source of clean and cheap energy, where UV light makes no more than 3–5% while visible light is about 45% of the total sunlight, it is highly desirable to synthesize ZnO-based materials capable for visible light photocatalysis. To modify the optical absorption properties and improving the visible light photocatalytic activity of ZnO materials several approaches have been applied: (1) metal ion doping, (2) nonmetal doping, (3) defect induced doping, (4) surface sensitization of ZnO particles to extend the spectral response into the visible region, (5) band gap modification by creation of oxygen vacancies and oxygen sub-stoichiometry, etc. In this study, ZnO powder with nanospherical morphology was synthesized by microwave processing. In the continuation, the synthesized powder was used for preparation of composites with polyethylene oxide (PEO). PEO powders with three different molecular mass (200.000, 600.000 and 900.000) were used for composites preparation. The phase purity and crystal structure of the composites were investigated by X-ray diffraction and Raman spectroscopy. The particles morphology and size distributions were studied by FE–SEM and laser diffraction particle size analyzer, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence spectroscopy. The photocatalytic activity of ZnO-PEO composites was examined via decomposition of methylene blue (MB) under direct sunlight irradiation. A large efficiency of MB degradation was found after 6 h of irradiation. An enhanced optical and photocatalytical properties of ZnO-PEO composites were attributed to: (1) lattice defects introduced in crystal structure of ZnO by fast microwave processing, and (2) surface sensitization by polyethylene oxide (PEO).
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Sixteenth Annual Conference YUCOMAT 2014: Programme and the Book of Abstracts
T1  - Photocatalytic activity of ZnO-PEO composites
SP  - 31
EP  - 31
UR  - https://hdl.handle.net/21.15107/rcub_dais_591
ER  - 
@conference{
author = "Marković, Smilja and Rajić, Vladimir B. and Stanković, Ana and Uskoković, Dragan",
year = "2014",
abstract = "The removal of organic pollutants from wastewater is very important for environmental protection. During the years different methods have been developed and applied on wastewater treatment. Between those methods a heterogeneous photocatalysis has received extensive attention since it allows a complete mineralization of pollutants. ZnO-based materials has established role in heterogeneous photocatalysis. However, major drawback of ZnO is a band energy gap of 3.37 eV (368 nm) which restricts the material to absorb only UV light. Since sunlight is a source of clean and cheap energy, where UV light makes no more than 3–5% while visible light is about 45% of the total sunlight, it is highly desirable to synthesize ZnO-based materials capable for visible light photocatalysis. To modify the optical absorption properties and improving the visible light photocatalytic activity of ZnO materials several approaches have been applied: (1) metal ion doping, (2) nonmetal doping, (3) defect induced doping, (4) surface sensitization of ZnO particles to extend the spectral response into the visible region, (5) band gap modification by creation of oxygen vacancies and oxygen sub-stoichiometry, etc. In this study, ZnO powder with nanospherical morphology was synthesized by microwave processing. In the continuation, the synthesized powder was used for preparation of composites with polyethylene oxide (PEO). PEO powders with three different molecular mass (200.000, 600.000 and 900.000) were used for composites preparation. The phase purity and crystal structure of the composites were investigated by X-ray diffraction and Raman spectroscopy. The particles morphology and size distributions were studied by FE–SEM and laser diffraction particle size analyzer, respectively. The optical properties were studied using UV–Vis diffuse reflectance and photoluminescence spectroscopy. The photocatalytic activity of ZnO-PEO composites was examined via decomposition of methylene blue (MB) under direct sunlight irradiation. A large efficiency of MB degradation was found after 6 h of irradiation. An enhanced optical and photocatalytical properties of ZnO-PEO composites were attributed to: (1) lattice defects introduced in crystal structure of ZnO by fast microwave processing, and (2) surface sensitization by polyethylene oxide (PEO).",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Sixteenth Annual Conference YUCOMAT 2014: Programme and the Book of Abstracts",
title = "Photocatalytic activity of ZnO-PEO composites",
pages = "31-31",
url = "https://hdl.handle.net/21.15107/rcub_dais_591"
}
Marković, S., Rajić, V. B., Stanković, A.,& Uskoković, D.. (2014). Photocatalytic activity of ZnO-PEO composites. in The Sixteenth Annual Conference YUCOMAT 2014: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 31-31.
https://hdl.handle.net/21.15107/rcub_dais_591
Marković S, Rajić VB, Stanković A, Uskoković D. Photocatalytic activity of ZnO-PEO composites. in The Sixteenth Annual Conference YUCOMAT 2014: Programme and the Book of Abstracts. 2014;:31-31.
https://hdl.handle.net/21.15107/rcub_dais_591 .
Marković, Smilja, Rajić, Vladimir B., Stanković, Ana, Uskoković, Dragan, "Photocatalytic activity of ZnO-PEO composites" in The Sixteenth Annual Conference YUCOMAT 2014: Programme and the Book of Abstracts (2014):31-31,
https://hdl.handle.net/21.15107/rcub_dais_591 .

Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method

Stanković, Ana; Veselinović, Ljiljana; Marković, Smilja; Uskoković, Dragan

(2013)

TY  - CONF
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/149
AB  - Poster presented at the 15th Annual Conference of the Materials Research Society of Serbia - YUCOMAT 2013, Herceg Novi, Montenegro, September 2–6, 2013
T1  - Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method
UR  - https://hdl.handle.net/21.15107/rcub_dais_149
ER  - 
@conference{
author = "Stanković, Ana and Veselinović, Ljiljana and Marković, Smilja and Uskoković, Dragan",
year = "2013",
abstract = "Poster presented at the 15th Annual Conference of the Materials Research Society of Serbia - YUCOMAT 2013, Herceg Novi, Montenegro, September 2–6, 2013",
title = "Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method",
url = "https://hdl.handle.net/21.15107/rcub_dais_149"
}
Stanković, A., Veselinović, L., Marković, S.,& Uskoković, D.. (2013). Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method. .
https://hdl.handle.net/21.15107/rcub_dais_149
Stanković A, Veselinović L, Marković S, Uskoković D. Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method. 2013;.
https://hdl.handle.net/21.15107/rcub_dais_149 .
Stanković, Ana, Veselinović, Ljiljana, Marković, Smilja, Uskoković, Dragan, "Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method" (2013),
https://hdl.handle.net/21.15107/rcub_dais_149 .

Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents

Stanković, Ana; Dimitrijević, S.; Uskoković, Dragan

(Elsevier, 2013)

TY  - JOUR
AU  - Stanković, Ana
AU  - Dimitrijević, S.
AU  - Uskoković, Dragan
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/380
AB  - Metal oxide nanoparticles represent a new class of important materials that are increasingly being developed for use in research and health-related applications. Although the antibacterial activity and efficiency of bulk zinc oxide were investigated in vitro, the knowledge about the antibacterial activity of ZnO nanoparticles remains deficient. In this study, we have synthesized ZnO particles of different sizes and morphologies with the assistance of different types of surface stabilizing agents – polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and poly (α,γ, l-glutamic acid) (PGA) – through a low-temperature hydrothermal procedure. The characterization of the prepared powders was preformed using X-ray diffraction (XRD) method and field emission scanning electron microscopy (FE SEM), as well as Malvern's Mastersizer instrument for particle size distribution. The specific surface area (SSA) of the ZnO powders was measured by standard Brunauer–Emmett–Teller (BET) technique.

The antibacterial behavior of the synthesized ZnO particles was tested against gram-negative and gram-positive bacterial cultures, namely Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), respectively. We compared the results of the antibacterial properties of the synthesized ZnO samples with those of the commercial ZnO powder. According to the obtained results, the highest microbial cell reduction rate was recorded for the synthesized ZnO powder consisting of nanospherical particles. In all of the examined samples, ZnO particles demonstrated a significant bacteriostatic activity.
PB  - Elsevier
T2  - Colloids and Surfaces B: Biointerfaces
T1  - Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents
SP  - 21
EP  - 28
VL  - 102
DO  - 10.1016/j.colsurfb.2012.07.033
UR  - https://hdl.handle.net/21.15107/rcub_dais_380
ER  - 
@article{
author = "Stanković, Ana and Dimitrijević, S. and Uskoković, Dragan",
year = "2013",
abstract = "Metal oxide nanoparticles represent a new class of important materials that are increasingly being developed for use in research and health-related applications. Although the antibacterial activity and efficiency of bulk zinc oxide were investigated in vitro, the knowledge about the antibacterial activity of ZnO nanoparticles remains deficient. In this study, we have synthesized ZnO particles of different sizes and morphologies with the assistance of different types of surface stabilizing agents – polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and poly (α,γ, l-glutamic acid) (PGA) – through a low-temperature hydrothermal procedure. The characterization of the prepared powders was preformed using X-ray diffraction (XRD) method and field emission scanning electron microscopy (FE SEM), as well as Malvern's Mastersizer instrument for particle size distribution. The specific surface area (SSA) of the ZnO powders was measured by standard Brunauer–Emmett–Teller (BET) technique.

The antibacterial behavior of the synthesized ZnO particles was tested against gram-negative and gram-positive bacterial cultures, namely Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), respectively. We compared the results of the antibacterial properties of the synthesized ZnO samples with those of the commercial ZnO powder. According to the obtained results, the highest microbial cell reduction rate was recorded for the synthesized ZnO powder consisting of nanospherical particles. In all of the examined samples, ZnO particles demonstrated a significant bacteriostatic activity.",
publisher = "Elsevier",
journal = "Colloids and Surfaces B: Biointerfaces",
title = "Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents",
pages = "21-28",
volume = "102",
doi = "10.1016/j.colsurfb.2012.07.033",
url = "https://hdl.handle.net/21.15107/rcub_dais_380"
}
Stanković, A., Dimitrijević, S.,& Uskoković, D.. (2013). Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents. in Colloids and Surfaces B: Biointerfaces
Elsevier., 102, 21-28.
https://doi.org/10.1016/j.colsurfb.2012.07.033
https://hdl.handle.net/21.15107/rcub_dais_380
Stanković A, Dimitrijević S, Uskoković D. Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents. in Colloids and Surfaces B: Biointerfaces. 2013;102:21-28.
doi:10.1016/j.colsurfb.2012.07.033
https://hdl.handle.net/21.15107/rcub_dais_380 .
Stanković, Ana, Dimitrijević, S., Uskoković, Dragan, "Influence of size scale and morphology on antibacterial properties of ZnO powders hydrothemally synthesized using different surface stabilizing agents" in Colloids and Surfaces B: Biointerfaces, 102 (2013):21-28,
https://doi.org/10.1016/j.colsurfb.2012.07.033 .,
https://hdl.handle.net/21.15107/rcub_dais_380 .
139
118
132

Application of peach shells for the removal of methylene blue and brilliant green

Marković, Smilja; Stanković, Ana; Lopičić, Zorica; Stojanović, M.; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2013)

TY  - CONF
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Lopičić, Zorica
AU  - Stojanović, M.
AU  - Uskoković, Dragan
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/398
AB  - Increased industrial, agricultural and domestic activities resulted in the production of large amount of wastewater containing a number of toxic materials which continuously polluting the available fresh water. Sorption is an effective method for water decontamination. Various types of pollutants such as metal ions, dyes, and a number of other organic and inorganic compounds and bio-organisms could be removed by different types of sorbents. Important properties of good sorbent material are high specific surface area and fast kinetics for the removal of pollutants. Natural materials such as oil palm fibers and shells, waste apricot and pitch, olive-seeds waste, peach stones, almond shells, walnut shells, hazelnut shells, kaolin, bentonite, zeolites, coal, etc., possess large capacities for removing of the water pollutants. The main advantages of these materials are wide availability, low cost and environmental safety. The peach shells (PS) were used as the raw material for removing of non-degradable toxic dyes from water solutions. Methylene blue (MB) and brilliant green (BG) were used as representatives of dyes which commonly are pollutant from the textile industry. The peach shells were milled in vibromill and sieved to desired sizes: (1) 100-500 μm, and (2) < 100 μm. The phase composition of the prepared particles fractions was identified by XRD. The BET specific surface area was determined from N2 adsorption/desorption experiments. The particles morphology was characterized by SEM, while the particle size distribution was measured by laser light-scattering particle size analyzer. In a typical experiment, 50 mg of PS particles as the sorbent was mixed on a magnetic stirrer with 50 ml of dye aqueous solution with the initial concentration of 5, 10 and 20 ppm, at room temperature. At time intervals of 5 to 120 minutes aliquots was withdrawn, centrifuged, and pollutant concentration was measured. The concentration of MB and BG in the solution before and after sorption by PS was calculated according to the absorbance value at 665 nm (for MB) and 624 nm (for BG) determined by UV measurements performed on a UV–Vis spectrophotometer in the wavelength range of 300–800 nm. Capacity of MB and BG sorption by prepared PS particles was found to be above 86 % after 120 minutes.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
T1  - Application of peach shells for the removal of methylene blue and brilliant green
SP  - 111
EP  - 111
UR  - https://hdl.handle.net/21.15107/rcub_dais_398
ER  - 
@conference{
author = "Marković, Smilja and Stanković, Ana and Lopičić, Zorica and Stojanović, M. and Uskoković, Dragan",
year = "2013",
abstract = "Increased industrial, agricultural and domestic activities resulted in the production of large amount of wastewater containing a number of toxic materials which continuously polluting the available fresh water. Sorption is an effective method for water decontamination. Various types of pollutants such as metal ions, dyes, and a number of other organic and inorganic compounds and bio-organisms could be removed by different types of sorbents. Important properties of good sorbent material are high specific surface area and fast kinetics for the removal of pollutants. Natural materials such as oil palm fibers and shells, waste apricot and pitch, olive-seeds waste, peach stones, almond shells, walnut shells, hazelnut shells, kaolin, bentonite, zeolites, coal, etc., possess large capacities for removing of the water pollutants. The main advantages of these materials are wide availability, low cost and environmental safety. The peach shells (PS) were used as the raw material for removing of non-degradable toxic dyes from water solutions. Methylene blue (MB) and brilliant green (BG) were used as representatives of dyes which commonly are pollutant from the textile industry. The peach shells were milled in vibromill and sieved to desired sizes: (1) 100-500 μm, and (2) < 100 μm. The phase composition of the prepared particles fractions was identified by XRD. The BET specific surface area was determined from N2 adsorption/desorption experiments. The particles morphology was characterized by SEM, while the particle size distribution was measured by laser light-scattering particle size analyzer. In a typical experiment, 50 mg of PS particles as the sorbent was mixed on a magnetic stirrer with 50 ml of dye aqueous solution with the initial concentration of 5, 10 and 20 ppm, at room temperature. At time intervals of 5 to 120 minutes aliquots was withdrawn, centrifuged, and pollutant concentration was measured. The concentration of MB and BG in the solution before and after sorption by PS was calculated according to the absorbance value at 665 nm (for MB) and 624 nm (for BG) determined by UV measurements performed on a UV–Vis spectrophotometer in the wavelength range of 300–800 nm. Capacity of MB and BG sorption by prepared PS particles was found to be above 86 % after 120 minutes.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts",
title = "Application of peach shells for the removal of methylene blue and brilliant green",
pages = "111-111",
url = "https://hdl.handle.net/21.15107/rcub_dais_398"
}
Marković, S., Stanković, A., Lopičić, Z., Stojanović, M.,& Uskoković, D.. (2013). Application of peach shells for the removal of methylene blue and brilliant green. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 111-111.
https://hdl.handle.net/21.15107/rcub_dais_398
Marković S, Stanković A, Lopičić Z, Stojanović M, Uskoković D. Application of peach shells for the removal of methylene blue and brilliant green. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts. 2013;:111-111.
https://hdl.handle.net/21.15107/rcub_dais_398 .
Marković, Smilja, Stanković, Ana, Lopičić, Zorica, Stojanović, M., Uskoković, Dragan, "Application of peach shells for the removal of methylene blue and brilliant green" in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts (2013):111-111,
https://hdl.handle.net/21.15107/rcub_dais_398 .

Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method

Stanković, Ana; Veselinović, Ljiljana; Marković, Smilja; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2013)

TY  - CONF
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/404
AB  - Nanostructured semiconductor materials are of great importance for various tecnological application due to their phisical and chemical properties wich are determined by the morphology and the size of the particles. Among semiconducor oxides, ZnO is one of the most important multifunctional material with its wide direct band gap energy of 3.37 eV and its excitation binding energy around 60 meV. Nowadays, many studies focus on the application of sonochemical reactions for treatment of industrial wastewaters, and also investigated the improvements of this method by some semiconductor materials (ZnO or TiO2) due to their high catalytic activity, stable chemical properties, safety and low cost. For a long period of time different toxic materials are used in dyeing, paper and pulp, textiles, plastics, leather, paint, cosmetics, pharmaceutical and food industries. These toxic materials usually have very complex, aromatic molecular structures which make them extremely stable and difficult to biodegrade. Sonocatalytic degradation presents a very efficient method for wastewater purification. In this work we have investigated heterogenic sonocatalytic degradation of methylen blue (MB) aqueous solution, as a common organic pollutant, in the presence of nanosized ZnO powder as catalysts. The phase composition of sonochemicaly synthesized ZnO nanopowder was identified by XRD, particles morphology was characterized by FE–SEM, while the particle size distribution was measured by laser light-scattering particle size analyzer. The optical properties of ZnO nanocrystals were investigated by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS). In a typical experimental procedure we used 5, 10 and 20 ppm water solution of MB containing 50 mg of nanosized ZnO powder. Prepared suspensions were treated with the ultrasound irradiation which has an output of 150 W. Concentration of the MB dye in the water solution containing ZnO nanoparticles before and after sonocatalytic degradation was calculated according to the absorbance maxima value at 665 nm characteristic for MB. The experiments were performed on a UV–Vis spectrophotometer in the wavelength range of 300–800 nm. Degradation efficiency of MB dye (for all examined concentrations) was found to be close to 100% after ultrasound treatment in the presence of ZnO nanoparticles.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
T1  - Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method
SP  - 115
EP  - 115
UR  - https://hdl.handle.net/21.15107/rcub_dais_404
ER  - 
@conference{
author = "Stanković, Ana and Veselinović, Ljiljana and Marković, Smilja and Uskoković, Dragan",
year = "2013",
abstract = "Nanostructured semiconductor materials are of great importance for various tecnological application due to their phisical and chemical properties wich are determined by the morphology and the size of the particles. Among semiconducor oxides, ZnO is one of the most important multifunctional material with its wide direct band gap energy of 3.37 eV and its excitation binding energy around 60 meV. Nowadays, many studies focus on the application of sonochemical reactions for treatment of industrial wastewaters, and also investigated the improvements of this method by some semiconductor materials (ZnO or TiO2) due to their high catalytic activity, stable chemical properties, safety and low cost. For a long period of time different toxic materials are used in dyeing, paper and pulp, textiles, plastics, leather, paint, cosmetics, pharmaceutical and food industries. These toxic materials usually have very complex, aromatic molecular structures which make them extremely stable and difficult to biodegrade. Sonocatalytic degradation presents a very efficient method for wastewater purification. In this work we have investigated heterogenic sonocatalytic degradation of methylen blue (MB) aqueous solution, as a common organic pollutant, in the presence of nanosized ZnO powder as catalysts. The phase composition of sonochemicaly synthesized ZnO nanopowder was identified by XRD, particles morphology was characterized by FE–SEM, while the particle size distribution was measured by laser light-scattering particle size analyzer. The optical properties of ZnO nanocrystals were investigated by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS). In a typical experimental procedure we used 5, 10 and 20 ppm water solution of MB containing 50 mg of nanosized ZnO powder. Prepared suspensions were treated with the ultrasound irradiation which has an output of 150 W. Concentration of the MB dye in the water solution containing ZnO nanoparticles before and after sonocatalytic degradation was calculated according to the absorbance maxima value at 665 nm characteristic for MB. The experiments were performed on a UV–Vis spectrophotometer in the wavelength range of 300–800 nm. Degradation efficiency of MB dye (for all examined concentrations) was found to be close to 100% after ultrasound treatment in the presence of ZnO nanoparticles.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts",
title = "Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method",
pages = "115-115",
url = "https://hdl.handle.net/21.15107/rcub_dais_404"
}
Stanković, A., Veselinović, L., Marković, S.,& Uskoković, D.. (2013). Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 115-115.
https://hdl.handle.net/21.15107/rcub_dais_404
Stanković A, Veselinović L, Marković S, Uskoković D. Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method. in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts. 2013;:115-115.
https://hdl.handle.net/21.15107/rcub_dais_404 .
Stanković, Ana, Veselinović, Ljiljana, Marković, Smilja, Uskoković, Dragan, "Sonocatalytic degradation of methylene blue dye using a nanosized zinc oxide powder prepared via sonochemical method" in The Fifteenth Annual Conference YUCOMAT 2013: Programme and the Book of Abstracts (2013):115-115,
https://hdl.handle.net/21.15107/rcub_dais_404 .

Photocatalytic and sonocatalytic degradation procedures of methylene blue dye using a ZnO nanostructured powders

Stanković, Ana; Marković, Smilja; Uskoković, Dragan

(Belgrade : Institute of Technical Sciences of SASA, 2013)

TY  - CONF
AU  - Stanković, Ana
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/443
AB  - The elimination of organic pollutants from wastewater is an important procedure in environmental protection. Dyestuffs and other commercial pigments have emerged as a focus of environmental recovery efforts. Various chemical and physical processes, such as chemical precipitation and separation of pollutants, coagulation, and elimination by adsorption on activated carbon are applied for elimination of organic pollutants. The main disadvantage of these methods is that they only change the contamination from one phase to another. In recent years, semiconductorassisted photocatalysis and sonocatalysis has been extensively investigated, primarily due to its capability to degrade a great number of chemicals in gaseous or aqueous systems, through relatively in-expensive procedures. In this work we have investigated heterogenic photocatalytic and sonocatalytic degradation of methylen blue (MB) aqueous solution, as a common organic pollutant, in the presence of nanosized ZnO powder as a catalyst. The phase composition of synthesized ZnO nanopowder was identified by XRD, particles morphology was characterized by FE–SEM. The optical properties of ZnO nanocrystals were investigated by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS). Concentration of the MB dye in the water solution containing ZnO nanoparticles before and after photocatalytic or sonocatalytic degradation was calculated according to the absorbance maxima value at 665 nm characteristic for MB. The experiments were performed on a UV–Vis spectrophotometer in the wavelength range of 300–800 nm.
PB  - Belgrade : 	Institute of Technical Sciences of SASA
C3  - Program and the Book of Abstracts / Twelfth Young Researchers' Conference Materials Sciences and Engineering December 11-13, 2013, Belgrade, Serbia
T1  - Photocatalytic and sonocatalytic degradation procedures of methylene blue dye using a ZnO nanostructured powders
SP  - 13
EP  - 13
UR  - https://hdl.handle.net/21.15107/rcub_dais_443
ER  - 
@conference{
author = "Stanković, Ana and Marković, Smilja and Uskoković, Dragan",
year = "2013",
abstract = "The elimination of organic pollutants from wastewater is an important procedure in environmental protection. Dyestuffs and other commercial pigments have emerged as a focus of environmental recovery efforts. Various chemical and physical processes, such as chemical precipitation and separation of pollutants, coagulation, and elimination by adsorption on activated carbon are applied for elimination of organic pollutants. The main disadvantage of these methods is that they only change the contamination from one phase to another. In recent years, semiconductorassisted photocatalysis and sonocatalysis has been extensively investigated, primarily due to its capability to degrade a great number of chemicals in gaseous or aqueous systems, through relatively in-expensive procedures. In this work we have investigated heterogenic photocatalytic and sonocatalytic degradation of methylen blue (MB) aqueous solution, as a common organic pollutant, in the presence of nanosized ZnO powder as a catalyst. The phase composition of synthesized ZnO nanopowder was identified by XRD, particles morphology was characterized by FE–SEM. The optical properties of ZnO nanocrystals were investigated by ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS). Concentration of the MB dye in the water solution containing ZnO nanoparticles before and after photocatalytic or sonocatalytic degradation was calculated according to the absorbance maxima value at 665 nm characteristic for MB. The experiments were performed on a UV–Vis spectrophotometer in the wavelength range of 300–800 nm.",
publisher = "Belgrade : 	Institute of Technical Sciences of SASA",
journal = "Program and the Book of Abstracts / Twelfth Young Researchers' Conference Materials Sciences and Engineering December 11-13, 2013, Belgrade, Serbia",
title = "Photocatalytic and sonocatalytic degradation procedures of methylene blue dye using a ZnO nanostructured powders",
pages = "13-13",
url = "https://hdl.handle.net/21.15107/rcub_dais_443"
}
Stanković, A., Marković, S.,& Uskoković, D.. (2013). Photocatalytic and sonocatalytic degradation procedures of methylene blue dye using a ZnO nanostructured powders. in Program and the Book of Abstracts / Twelfth Young Researchers' Conference Materials Sciences and Engineering December 11-13, 2013, Belgrade, Serbia
Belgrade : 	Institute of Technical Sciences of SASA., 13-13.
https://hdl.handle.net/21.15107/rcub_dais_443
Stanković A, Marković S, Uskoković D. Photocatalytic and sonocatalytic degradation procedures of methylene blue dye using a ZnO nanostructured powders. in Program and the Book of Abstracts / Twelfth Young Researchers' Conference Materials Sciences and Engineering December 11-13, 2013, Belgrade, Serbia. 2013;:13-13.
https://hdl.handle.net/21.15107/rcub_dais_443 .
Stanković, Ana, Marković, Smilja, Uskoković, Dragan, "Photocatalytic and sonocatalytic degradation procedures of methylene blue dye using a ZnO nanostructured powders" in Program and the Book of Abstracts / Twelfth Young Researchers' Conference Materials Sciences and Engineering December 11-13, 2013, Belgrade, Serbia (2013):13-13,
https://hdl.handle.net/21.15107/rcub_dais_443 .

Controlled hydrothermal processing of ZnO powders in the presence of PVP

Stanković, Ana; Stojanović, Zoran S.; Veselinović, Ljiljana; Marković, Smilja; Uskoković, Dragan

(Belgrade : Society of Physical Chemists of Serbia, 2012)

TY  - CONF
AU  - Stanković, Ana
AU  - Stojanović, Zoran S.
AU  - Veselinović, Ljiljana
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/530
AB  - In this study low-temperature hydrothermal processing was used for synthesis of ZnO powders with controlled morphology, from micro rods, via hexagonal prism-like to nano-spheres, by varying [Zn2+]/[OH-] molar ratio. The synthesized powders were characterized using XRPD, FE-SEM, UV-Vis diffuse reflectance and Raman spectroscopy. It is noticed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased visible light absorption. Besides, the band gap energy of the synthesized ZnO powders showed the red shift (-0.20eV) compared to bulk ZnO. The enhanced visible light absorption of the ZnO powders is related to the existence of lattice defects and the particle surface sensitization by PVP.
PB  - Belgrade : Society of Physical Chemists of Serbia
C3  - Physical Chemistry 2012 : proceedings. Vol. 1 / 11th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2012, Belgrade, Serbia
T1  - Controlled hydrothermal processing of ZnO powders in the presence of PVP
SP  - 431
EP  - 433
UR  - https://hdl.handle.net/21.15107/rcub_dais_530
ER  - 
@conference{
author = "Stanković, Ana and Stojanović, Zoran S. and Veselinović, Ljiljana and Marković, Smilja and Uskoković, Dragan",
year = "2012",
abstract = "In this study low-temperature hydrothermal processing was used for synthesis of ZnO powders with controlled morphology, from micro rods, via hexagonal prism-like to nano-spheres, by varying [Zn2+]/[OH-] molar ratio. The synthesized powders were characterized using XRPD, FE-SEM, UV-Vis diffuse reflectance and Raman spectroscopy. It is noticed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased visible light absorption. Besides, the band gap energy of the synthesized ZnO powders showed the red shift (-0.20eV) compared to bulk ZnO. The enhanced visible light absorption of the ZnO powders is related to the existence of lattice defects and the particle surface sensitization by PVP.",
publisher = "Belgrade : Society of Physical Chemists of Serbia",
journal = "Physical Chemistry 2012 : proceedings. Vol. 1 / 11th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2012, Belgrade, Serbia",
title = "Controlled hydrothermal processing of ZnO powders in the presence of PVP",
pages = "431-433",
url = "https://hdl.handle.net/21.15107/rcub_dais_530"
}
Stanković, A., Stojanović, Z. S., Veselinović, L., Marković, S.,& Uskoković, D.. (2012). Controlled hydrothermal processing of ZnO powders in the presence of PVP. in Physical Chemistry 2012 : proceedings. Vol. 1 / 11th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2012, Belgrade, Serbia
Belgrade : Society of Physical Chemists of Serbia., 431-433.
https://hdl.handle.net/21.15107/rcub_dais_530
Stanković A, Stojanović ZS, Veselinović L, Marković S, Uskoković D. Controlled hydrothermal processing of ZnO powders in the presence of PVP. in Physical Chemistry 2012 : proceedings. Vol. 1 / 11th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2012, Belgrade, Serbia. 2012;:431-433.
https://hdl.handle.net/21.15107/rcub_dais_530 .
Stanković, Ana, Stojanović, Zoran S., Veselinović, Ljiljana, Marković, Smilja, Uskoković, Dragan, "Controlled hydrothermal processing of ZnO powders in the presence of PVP" in Physical Chemistry 2012 : proceedings. Vol. 1 / 11th International Conference on Fundamental and Applied Aspects of Physical Chemistry, September 24-28, 2012, Belgrade, Serbia (2012):431-433,
https://hdl.handle.net/21.15107/rcub_dais_530 .

Influence of particle size and morphology of ZnO powders on their optical properties

Stanković, Ana; Stojanović, Zoran S.; Veselinović, Ljiljana; Abazović, Nadica; Škapin, Srečo Davor; Marković, Smilja; Uskoković, Dragan

(Belgrade : Serbian Ceramic Society, 2012)

TY  - CONF
AU  - Stanković, Ana
AU  - Stojanović, Zoran S.
AU  - Veselinović, Ljiljana
AU  - Abazović, Nadica
AU  - Škapin, Srečo Davor
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/529
AB  - In this work we present details of different synthesis procedures for preparation of ZnO powders and a possibility to create various particles morphology and average size; from micrometer rods to nanometer spherical particles. We studied two synthesis methods, low temperature hydrothermal processing (HT) and ultrasound processing (US). The morphology and average particle size of the ZnO particles were modified by adjusting the mole ratio of [Zn2+]/[OH] in the reactants solution. Agglomeration of the particles was prevented using a polyvinyl pyrrolidone (PVP) as a capping agent. The synthesized powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (FESEM) and UV-Vis - diffusion reflection spectroscopy (UV-Vis DRS). Based on the results of the scanning electron microscopy we proposed a possible growth mechanism of the ZnO particles depending on the mole ratio of [Zn2+]/[OH]. 
Also, we considered the influence of particle size and morphology on the optical properties of the prepared powders. The observed results sowed that the size and morphology of ZnO particles greatly affect the absorption of visible light (%) and the shift of the energy gap (eV).
PB  - Belgrade : Serbian Ceramic Society
C3  - Joint Event of the 11th Young Researchers’ Conference: Materials Science and Engineering and the 1st European Early Stage Researches’ Conference on Hydrogen Storage: Program and the Book of Abstracts
T1  - Influence of particle size and morphology of ZnO powders on their optical properties
SP  - 60
EP  - 60
UR  - https://hdl.handle.net/21.15107/rcub_dais_529
ER  - 
@conference{
author = "Stanković, Ana and Stojanović, Zoran S. and Veselinović, Ljiljana and Abazović, Nadica and Škapin, Srečo Davor and Marković, Smilja and Uskoković, Dragan",
year = "2012",
abstract = "In this work we present details of different synthesis procedures for preparation of ZnO powders and a possibility to create various particles morphology and average size; from micrometer rods to nanometer spherical particles. We studied two synthesis methods, low temperature hydrothermal processing (HT) and ultrasound processing (US). The morphology and average particle size of the ZnO particles were modified by adjusting the mole ratio of [Zn2+]/[OH] in the reactants solution. Agglomeration of the particles was prevented using a polyvinyl pyrrolidone (PVP) as a capping agent. The synthesized powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (FESEM) and UV-Vis - diffusion reflection spectroscopy (UV-Vis DRS). Based on the results of the scanning electron microscopy we proposed a possible growth mechanism of the ZnO particles depending on the mole ratio of [Zn2+]/[OH]. 
Also, we considered the influence of particle size and morphology on the optical properties of the prepared powders. The observed results sowed that the size and morphology of ZnO particles greatly affect the absorption of visible light (%) and the shift of the energy gap (eV).",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Joint Event of the 11th Young Researchers’ Conference: Materials Science and Engineering and the 1st European Early Stage Researches’ Conference on Hydrogen Storage: Program and the Book of Abstracts",
title = "Influence of particle size and morphology of ZnO powders on their optical properties",
pages = "60-60",
url = "https://hdl.handle.net/21.15107/rcub_dais_529"
}
Stanković, A., Stojanović, Z. S., Veselinović, L., Abazović, N., Škapin, S. D., Marković, S.,& Uskoković, D.. (2012). Influence of particle size and morphology of ZnO powders on their optical properties. in Joint Event of the 11th Young Researchers’ Conference: Materials Science and Engineering and the 1st European Early Stage Researches’ Conference on Hydrogen Storage: Program and the Book of Abstracts
Belgrade : Serbian Ceramic Society., 60-60.
https://hdl.handle.net/21.15107/rcub_dais_529
Stanković A, Stojanović ZS, Veselinović L, Abazović N, Škapin SD, Marković S, Uskoković D. Influence of particle size and morphology of ZnO powders on their optical properties. in Joint Event of the 11th Young Researchers’ Conference: Materials Science and Engineering and the 1st European Early Stage Researches’ Conference on Hydrogen Storage: Program and the Book of Abstracts. 2012;:60-60.
https://hdl.handle.net/21.15107/rcub_dais_529 .
Stanković, Ana, Stojanović, Zoran S., Veselinović, Ljiljana, Abazović, Nadica, Škapin, Srečo Davor, Marković, Smilja, Uskoković, Dragan, "Influence of particle size and morphology of ZnO powders on their optical properties" in Joint Event of the 11th Young Researchers’ Conference: Materials Science and Engineering and the 1st European Early Stage Researches’ Conference on Hydrogen Storage: Program and the Book of Abstracts (2012):60-60,
https://hdl.handle.net/21.15107/rcub_dais_529 .

ZnO micro and nanocrystals with enhanced visible light absorption

Stanković, Ana; Stojanović, Zoran S.; Veselinović, Ljiljana; Škapin, Srečo Davor; Bračko, Ines; Marković, Smilja; Uskoković, Dragan

(Elsevier, 2012)

TY  - JOUR
AU  - Stanković, Ana
AU  - Stojanović, Zoran S.
AU  - Veselinović, Ljiljana
AU  - Škapin, Srečo Davor
AU  - Bračko, Ines
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/486
AB  - In this paper, we investigate the effect of the particle size and morphology on the optical properties of ZnO. A series of ZnO micro and nanocrystals were synthesized by the hydrothermal processing of zinc acetate dihydrate and sodium hydroxide as the starting materials, and polyvinylpyrrolidone (PVP) as the polymer surfactant. The particle size and morphology were tailored by adjusting the reactant molar ratios [Zn2+]/[OH−], while the reaction temperature and the time remained unchanged. X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high-resolution TEM (HRTEM) have shown that the micro and nanocrystals have a high crystalline pure wurtzite-type hexagonal structure with nanosized crystallites. The size and morphology of the ZnO micro and nanocrystals were investigated by field emission scanning electron microscopy (FE-SEM), which showed a modification from micro-rods via hexagonal-faceted prismatic morphology to nanospheres, caused by simple adjustment of the reactant molar ratio [Zn2+]/[OH−] from 1:1 to 1:5. The optical properties of the ZnO micro and nanocrystals, as well as their dependence on the particle size and morphology were investigated by Raman and ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy (DRS). The UV–vis spectra showed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased absorption, and a slight red-shift of the absorption edge (0.06 eV). Besides, the band gap energy of the synthesized ZnO micro and nanocrystals showed the red shift (∼0.20 eV) compared to bulk ZnO. According to the results of a Raman spectroscopy, the enhanced visible light absorption of the ZnO micro and nanocrystals is related to two phenomena: (1) the existence of lattice defects (oxygen vacancies and zinc interstitials), and (2) the particle surface sensitization by PVP.
PB  - Elsevier
T2  - Materials Science and Engineering: B
T1  - ZnO micro and nanocrystals with enhanced visible light absorption
SP  - 1038
EP  - 1045
DO  - 10.1016/j.mseb.2012.05.013
UR  - https://hdl.handle.net/21.15107/rcub_dais_486
ER  - 
@article{
author = "Stanković, Ana and Stojanović, Zoran S. and Veselinović, Ljiljana and Škapin, Srečo Davor and Bračko, Ines and Marković, Smilja and Uskoković, Dragan",
year = "2012",
abstract = "In this paper, we investigate the effect of the particle size and morphology on the optical properties of ZnO. A series of ZnO micro and nanocrystals were synthesized by the hydrothermal processing of zinc acetate dihydrate and sodium hydroxide as the starting materials, and polyvinylpyrrolidone (PVP) as the polymer surfactant. The particle size and morphology were tailored by adjusting the reactant molar ratios [Zn2+]/[OH−], while the reaction temperature and the time remained unchanged. X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and high-resolution TEM (HRTEM) have shown that the micro and nanocrystals have a high crystalline pure wurtzite-type hexagonal structure with nanosized crystallites. The size and morphology of the ZnO micro and nanocrystals were investigated by field emission scanning electron microscopy (FE-SEM), which showed a modification from micro-rods via hexagonal-faceted prismatic morphology to nanospheres, caused by simple adjustment of the reactant molar ratio [Zn2+]/[OH−] from 1:1 to 1:5. The optical properties of the ZnO micro and nanocrystals, as well as their dependence on the particle size and morphology were investigated by Raman and ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy (DRS). The UV–vis spectra showed that the modification of the particle size and morphology from nanospheres to micro-rods resulted in increased absorption, and a slight red-shift of the absorption edge (0.06 eV). Besides, the band gap energy of the synthesized ZnO micro and nanocrystals showed the red shift (∼0.20 eV) compared to bulk ZnO. According to the results of a Raman spectroscopy, the enhanced visible light absorption of the ZnO micro and nanocrystals is related to two phenomena: (1) the existence of lattice defects (oxygen vacancies and zinc interstitials), and (2) the particle surface sensitization by PVP.",
publisher = "Elsevier",
journal = "Materials Science and Engineering: B",
title = "ZnO micro and nanocrystals with enhanced visible light absorption",
pages = "1038-1045",
doi = "10.1016/j.mseb.2012.05.013",
url = "https://hdl.handle.net/21.15107/rcub_dais_486"
}
Stanković, A., Stojanović, Z. S., Veselinović, L., Škapin, S. D., Bračko, I., Marković, S.,& Uskoković, D.. (2012). ZnO micro and nanocrystals with enhanced visible light absorption. in Materials Science and Engineering: B
Elsevier., 1038-1045.
https://doi.org/10.1016/j.mseb.2012.05.013
https://hdl.handle.net/21.15107/rcub_dais_486
Stanković A, Stojanović ZS, Veselinović L, Škapin SD, Bračko I, Marković S, Uskoković D. ZnO micro and nanocrystals with enhanced visible light absorption. in Materials Science and Engineering: B. 2012;:1038-1045.
doi:10.1016/j.mseb.2012.05.013
https://hdl.handle.net/21.15107/rcub_dais_486 .
Stanković, Ana, Stojanović, Zoran S., Veselinović, Ljiljana, Škapin, Srečo Davor, Bračko, Ines, Marković, Smilja, Uskoković, Dragan, "ZnO micro and nanocrystals with enhanced visible light absorption" in Materials Science and Engineering: B (2012):1038-1045,
https://doi.org/10.1016/j.mseb.2012.05.013 .,
https://hdl.handle.net/21.15107/rcub_dais_486 .
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21
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Kreiranje morfologije i veličine čestica ZnO prahova

Marković, Smilja; Stanković, Ana; Veselinović, Ljiljana; Stojanović, Zoran S.; Uskoković, Dragan

(Beograd : Savez inženjera i tehničara Srbije, 2012)

TY  - JOUR
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Stojanović, Zoran S.
AU  - Uskoković, Dragan
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/479
AB  - U ovom tekstu objašnjeni su postupci sinteze prahova ZnO i mogućnosti da se tim sintezama morfologija i srednja veličina čestica kreiraju od mikrometarskih štapića do nanometarskih sfernih čestica. Primenjene su dve metode sinteze, niskotemperatursko hidrotermalno (HT) procesiranje i ultrazvučno (UZ) procesiranje. Morfologija i srednja veličina čestica su kreirane podešavanjem molskog odnosa [Zn2+]/[OH-] polaznog (prekurskorskog) rastvora. Aglomeracija čestica je sprečena upotrebom polivinil pirolidona (PVP). Sintetisani prahovi su karakterisani metodom rendgenske difrakcije na prahu (XRD), skanirajuće elektronske mikroskopije (FESEM) i UV-Vis difuzione refleksione spektroskopije (UV-Vis DRS). Na osnovu skanirajućih elektronskih mikrografija predložen je mehanizam rasta čestica ZnO u zavisnosti od molskog odnosa [Zn2+]/[OH-] polaznog rastvora. Takođe, ispitan je i uticaj veličine i morfologije čestica na optičke karakteristike prahova ZnO; uočeno je da veličina i morfologija čestica utiču kako na apsorpciju vidljive svetlosti (%) tako i na pomeraj energetskog procepa (eV).
AB  - Different ZnO powders synthesis methods as well as possibilities to obtain particles with controlled morphology and average particle size from micro- to nano-level were discussed. Two synthesis methods were applied, low-temperature hydrothermal (HT) and ultrasound processing (UZ). Morphology and average particle size were tailored by adjusting of initial solution [Zn2+]/[OH-]molar ratio. Particles agglomeration is suppressed by polyvinylpyrrolidone (PVP). Synthesized powders were characterized by X-ray diffraction method (XRD), field emission scanning electron microscopy (FESEM) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). Considering FESEM micrographs the ZnO particles growth mechanism depending on initial solution [Zn2+]/[OH-] molar ratio is proposed. Furthermore, influence of average particle size and morphology on ZnO optical properties is studied; it is observed that both average particle size and morphology affect visible light absorption (%) as well as shift of Ebg (eV).
PB  - Beograd : Savez inženjera i tehničara Srbije
T2  - Tehnika - Novi materijali
T1  - Kreiranje morfologije i veličine čestica ZnO prahova
SP  - 685
EP  - 691
UR  - https://hdl.handle.net/21.15107/rcub_dais_479
ER  - 
@article{
author = "Marković, Smilja and Stanković, Ana and Veselinović, Ljiljana and Stojanović, Zoran S. and Uskoković, Dragan",
year = "2012",
abstract = "U ovom tekstu objašnjeni su postupci sinteze prahova ZnO i mogućnosti da se tim sintezama morfologija i srednja veličina čestica kreiraju od mikrometarskih štapića do nanometarskih sfernih čestica. Primenjene su dve metode sinteze, niskotemperatursko hidrotermalno (HT) procesiranje i ultrazvučno (UZ) procesiranje. Morfologija i srednja veličina čestica su kreirane podešavanjem molskog odnosa [Zn2+]/[OH-] polaznog (prekurskorskog) rastvora. Aglomeracija čestica je sprečena upotrebom polivinil pirolidona (PVP). Sintetisani prahovi su karakterisani metodom rendgenske difrakcije na prahu (XRD), skanirajuće elektronske mikroskopije (FESEM) i UV-Vis difuzione refleksione spektroskopije (UV-Vis DRS). Na osnovu skanirajućih elektronskih mikrografija predložen je mehanizam rasta čestica ZnO u zavisnosti od molskog odnosa [Zn2+]/[OH-] polaznog rastvora. Takođe, ispitan je i uticaj veličine i morfologije čestica na optičke karakteristike prahova ZnO; uočeno je da veličina i morfologija čestica utiču kako na apsorpciju vidljive svetlosti (%) tako i na pomeraj energetskog procepa (eV)., Different ZnO powders synthesis methods as well as possibilities to obtain particles with controlled morphology and average particle size from micro- to nano-level were discussed. Two synthesis methods were applied, low-temperature hydrothermal (HT) and ultrasound processing (UZ). Morphology and average particle size were tailored by adjusting of initial solution [Zn2+]/[OH-]molar ratio. Particles agglomeration is suppressed by polyvinylpyrrolidone (PVP). Synthesized powders were characterized by X-ray diffraction method (XRD), field emission scanning electron microscopy (FESEM) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). Considering FESEM micrographs the ZnO particles growth mechanism depending on initial solution [Zn2+]/[OH-] molar ratio is proposed. Furthermore, influence of average particle size and morphology on ZnO optical properties is studied; it is observed that both average particle size and morphology affect visible light absorption (%) as well as shift of Ebg (eV).",
publisher = "Beograd : Savez inženjera i tehničara Srbije",
journal = "Tehnika - Novi materijali",
title = "Kreiranje morfologije i veličine čestica ZnO prahova",
pages = "685-691",
url = "https://hdl.handle.net/21.15107/rcub_dais_479"
}
Marković, S., Stanković, A., Veselinović, L., Stojanović, Z. S.,& Uskoković, D.. (2012). Kreiranje morfologije i veličine čestica ZnO prahova. in Tehnika - Novi materijali
Beograd : Savez inženjera i tehničara Srbije., 685-691.
https://hdl.handle.net/21.15107/rcub_dais_479
Marković S, Stanković A, Veselinović L, Stojanović ZS, Uskoković D. Kreiranje morfologije i veličine čestica ZnO prahova. in Tehnika - Novi materijali. 2012;:685-691.
https://hdl.handle.net/21.15107/rcub_dais_479 .
Marković, Smilja, Stanković, Ana, Veselinović, Ljiljana, Stojanović, Zoran S., Uskoković, Dragan, "Kreiranje morfologije i veličine čestica ZnO prahova" in Tehnika - Novi materijali (2012):685-691,
https://hdl.handle.net/21.15107/rcub_dais_479 .

Hydrothermal synthesis of ZnO powders with a tailored particle morphology and improved optical characteristics

Stanković, Ana; Stojanović, Zoran S.; Veselinović, Ljiljana; Bračko, Ines; Škapin, Srečo Davor; Marković, Smilja; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2012)

TY  - CONF
AU  - Stanković, Ana
AU  - Stojanović, Zoran S.
AU  - Veselinović, Ljiljana
AU  - Bračko, Ines
AU  - Škapin, Srečo Davor
AU  - Marković, Smilja
AU  - Uskoković, Dragan
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/435
AB  - ZnO represent one of the most important multifunctional materials. Its properties are well known and confirmed in different application areas such as: gas sensors, UV lasers, solar cells, electroluminescent and optoelectronic devices, piezoelectric transducers, hydrogen-storages, rubber industry and plastic processing, cosmetics and pharmacy, and it is also used as an antibacterial agent. In this work, we propose a low-temperature hydrothermal method for the synthesis of phase-pure ZnO powders with a controlled morphology and narrow particle size distribution. This simple and low-cost method allows tailoring of the shape and size of ZnO particles, from micro-rods via hexagonal prism-like to nano-spheres, by choosing the appropriate pH of the reaction solution, tuned by the varying of [Na+]:[Zn2+] molar ratio. The agglomeration of the powders was prevented with the assistance of PVP as a capping agent. The synthesized powders were characterized by XRD, TEM, SEAD and HRTEM methods to examine the phase purity and crystallinity. FE-SEM measurements were used for the morphology characterization, while the results of Raman and UV-Vis DRS measurements were used for the study of optical properties. The relationship between the particle size and morphology and the optical properties is discussed. Diffuse reflectance spectra of ZnO powders with different size and morphology revealed characteristic R curves with the absorption edge near 380 nm, but with obvious difference in the absorption in the visible region. The micro-sized powder ZnO8 revealed the lowest reflectance (∼70%), compared to submicro- (∼80%) and nano-sized (ZnO12 and ZnO13, ∼90%) powders. Thus, the reflectance of the ZnO powders decreases with the increase in the average particle size.
PB  - Belgrade : Materials Research Society of Serbia
C3  - The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts
T1  - Hydrothermal synthesis of ZnO powders with a tailored particle morphology and improved optical characteristics
SP  - 47
EP  - 47
UR  - https://hdl.handle.net/21.15107/rcub_dais_435
ER  - 
@conference{
author = "Stanković, Ana and Stojanović, Zoran S. and Veselinović, Ljiljana and Bračko, Ines and Škapin, Srečo Davor and Marković, Smilja and Uskoković, Dragan",
year = "2012",
abstract = "ZnO represent one of the most important multifunctional materials. Its properties are well known and confirmed in different application areas such as: gas sensors, UV lasers, solar cells, electroluminescent and optoelectronic devices, piezoelectric transducers, hydrogen-storages, rubber industry and plastic processing, cosmetics and pharmacy, and it is also used as an antibacterial agent. In this work, we propose a low-temperature hydrothermal method for the synthesis of phase-pure ZnO powders with a controlled morphology and narrow particle size distribution. This simple and low-cost method allows tailoring of the shape and size of ZnO particles, from micro-rods via hexagonal prism-like to nano-spheres, by choosing the appropriate pH of the reaction solution, tuned by the varying of [Na+]:[Zn2+] molar ratio. The agglomeration of the powders was prevented with the assistance of PVP as a capping agent. The synthesized powders were characterized by XRD, TEM, SEAD and HRTEM methods to examine the phase purity and crystallinity. FE-SEM measurements were used for the morphology characterization, while the results of Raman and UV-Vis DRS measurements were used for the study of optical properties. The relationship between the particle size and morphology and the optical properties is discussed. Diffuse reflectance spectra of ZnO powders with different size and morphology revealed characteristic R curves with the absorption edge near 380 nm, but with obvious difference in the absorption in the visible region. The micro-sized powder ZnO8 revealed the lowest reflectance (∼70%), compared to submicro- (∼80%) and nano-sized (ZnO12 and ZnO13, ∼90%) powders. Thus, the reflectance of the ZnO powders decreases with the increase in the average particle size.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts",
title = "Hydrothermal synthesis of ZnO powders with a tailored particle morphology and improved optical characteristics",
pages = "47-47",
url = "https://hdl.handle.net/21.15107/rcub_dais_435"
}
Stanković, A., Stojanović, Z. S., Veselinović, L., Bračko, I., Škapin, S. D., Marković, S.,& Uskoković, D.. (2012). Hydrothermal synthesis of ZnO powders with a tailored particle morphology and improved optical characteristics. in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts
Belgrade : Materials Research Society of Serbia., 47-47.
https://hdl.handle.net/21.15107/rcub_dais_435
Stanković A, Stojanović ZS, Veselinović L, Bračko I, Škapin SD, Marković S, Uskoković D. Hydrothermal synthesis of ZnO powders with a tailored particle morphology and improved optical characteristics. in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts. 2012;:47-47.
https://hdl.handle.net/21.15107/rcub_dais_435 .
Stanković, Ana, Stojanović, Zoran S., Veselinović, Ljiljana, Bračko, Ines, Škapin, Srečo Davor, Marković, Smilja, Uskoković, Dragan, "Hydrothermal synthesis of ZnO powders with a tailored particle morphology and improved optical characteristics" in The Fourteenth Annual Conference YUCOMAT 2012: Programme and the Book of Abstracts (2012):47-47,
https://hdl.handle.net/21.15107/rcub_dais_435 .