TY  - JOUR
AU  - Stefanović, Ivan S.
AU  - Dostanić, Jasmina
AU  - Lončarević, Davor
AU  - Vasiljević Radović, Dana
AU  - Ostojić, Sanja
AU  - Marković, Smilja
AU  - Pergal, Marija V.
PY  - 2019
UR  - https://dais.sanu.ac.rs/123456789/5761
AB  - This work is focused on preparation of poly(urethane-siloxane)/titanium-dioxide nanocomposites (PUSNs) with enhanced features. PUSNs were prepared by the in situ polymerization reaction using titanium-dioxide as a nano-filler in different amounts (1, 2, 3 and 5 wt.%) with respect to the poly(urethane-siloxane) (PUS) matrix. PUS copolymer was based on α,ω-dihy-droxy-ethoxypropyl-poly(dimethylsiloxane), 4,4’-methylenediphenyldiisocyanate and 1,4-bu-tanediole. In order to investigate the influence of TiO 2 content on the structure, UV resistance, thermal properties, hydrophobicity and morphology of the prepared PUSNs, FTIR spectroscopy, UV-Vis diffuse-reflectance spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), contact angle measurements, surface free energy (SFE) analysis, water absorption, scanning electron microscopy (SEM) and atomic force microscopy (AFM) were performed. The PUSNs showed excellent UV resistance, high hydrophobicity, low surface free energy and also higher thermal stability and rougher surface and cross-section relief structure as compared to the pure PUS copolymer. Based on the obtained results it can be concluded that prepared PUSNs could be potentially used as protective coatings. © 2019, Association of Chemists and Chemical Engineers of Serbia. All rights reserved.
PB  - Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Preparation and characterization of poly(Urethane-siloxane)/titanium-dioxide nanocomposites
SP  - 13
EP  - 24
VL  - 73
IS  - 1
DO  - 10.2298/HEMIND180530002S
UR  - https://hdl.handle.net/21.15107/rcub_dais_5761
ER  - 

@article{
author = "Stefanović, Ivan S. and Dostanić, Jasmina and Lončarević, Davor and Vasiljević Radović, Dana and Ostojić, Sanja and Marković, Smilja and Pergal, Marija V.",
year = "2019",
abstract = "This work is focused on preparation of poly(urethane-siloxane)/titanium-dioxide nanocomposites (PUSNs) with enhanced features. PUSNs were prepared by the in situ polymerization reaction using titanium-dioxide as a nano-filler in different amounts (1, 2, 3 and 5 wt.%) with respect to the poly(urethane-siloxane) (PUS) matrix. PUS copolymer was based on α,ω-dihy-droxy-ethoxypropyl-poly(dimethylsiloxane), 4,4’-methylenediphenyldiisocyanate and 1,4-bu-tanediole. In order to investigate the influence of TiO 2 content on the structure, UV resistance, thermal properties, hydrophobicity and morphology of the prepared PUSNs, FTIR spectroscopy, UV-Vis diffuse-reflectance spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), contact angle measurements, surface free energy (SFE) analysis, water absorption, scanning electron microscopy (SEM) and atomic force microscopy (AFM) were performed. The PUSNs showed excellent UV resistance, high hydrophobicity, low surface free energy and also higher thermal stability and rougher surface and cross-section relief structure as compared to the pure PUS copolymer. Based on the obtained results it can be concluded that prepared PUSNs could be potentially used as protective coatings. © 2019, Association of Chemists and Chemical Engineers of Serbia. All rights reserved.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Preparation and characterization of poly(Urethane-siloxane)/titanium-dioxide nanocomposites",
pages = "13-24",
volume = "73",
number = "1",
doi = "10.2298/HEMIND180530002S",
url = "https://hdl.handle.net/21.15107/rcub_dais_5761"
}

Stefanović, I. S., Dostanić, J., Lončarević, D., Vasiljević Radović, D., Ostojić, S., Marković, S.,& Pergal, M. V.. (2019). Preparation and characterization of poly(Urethane-siloxane)/titanium-dioxide nanocomposites. in Hemijska industrija
Association of the Chemical Engineers of Serbia., 73(1), 13-24.
https://doi.org/10.2298/HEMIND180530002S
https://hdl.handle.net/21.15107/rcub_dais_5761

Stefanović IS, Dostanić J, Lončarević D, Vasiljević Radović D, Ostojić S, Marković S, Pergal MV. Preparation and characterization of poly(Urethane-siloxane)/titanium-dioxide nanocomposites. in Hemijska industrija. 2019;73(1):13-24.
doi:10.2298/HEMIND180530002S
https://hdl.handle.net/21.15107/rcub_dais_5761 .

Stefanović, Ivan S., Dostanić, Jasmina, Lončarević, Davor, Vasiljević Radović, Dana, Ostojić, Sanja, Marković, Smilja, Pergal, Marija V., "Preparation and characterization of poly(Urethane-siloxane)/titanium-dioxide nanocomposites" in Hemijska industrija, 73, no. 1 (2019):13-24,
https://doi.org/10.2298/HEMIND180530002S .,
https://hdl.handle.net/21.15107/rcub_dais_5761 .

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  - https://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 .

TY  - CONF
AU  - Marković, Smilja
AU  - Stanković, Ana
AU  - Dostanić, Jasmina
AU  - Mančić, Lidija
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2017
UR  - https://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 .