Lević, Steva

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Authority KeyName Variants
orcid::0000-0003-4039-1926
  • Lević, Steva (15)
  • Lević, Steva M. (1)
Projects
Directed synthesis, structure and properties of multifunctional materials EU Operational Programme Competitiveness and Cohesion
European Structural and Investment Funds (2014-2020), “Modification of cheese ripening process and development of whey based products - SIRENA” Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200003 (Institute for Medicinal Plant Research 'Dr. Josif Pančić ', Belgrade)
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200135 (University of Belgrade, Faculty of Technology and Metallurgy) Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200287 (Innovation Center of the Faculty of Technology and Metallurgy)
Molecular designing of nanoparticles with controlled morphological and physicochemical characteristics and functional materials based on them Novel encapsulation and enzyme technologies for designing of new biocatalysts and biologically active compounds targeting enhancement of food quality, safety and competitiveness
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200116 (University of Belgrade, Faculty of Agriculture) Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200175 (Institute of Technical Sciences of SASA, Belgrade)
Develooment and utilization of novel and traditional technologies in production of competitive food products with added valued for national and global market - CREATING WEALTH FROM THE WEALTH OF SERBIA Magmatski, metamorfni i sedimentni procesi alpskog orogena u centralnom delu Balkanskog poluostrva
United States National Aeronautics and Space Administration (NASA), Grant NNX09AV07A United States National Science Foundation (NSF) / Centers of Research Excellence in Science and Technology (CREST), Grant HRD-0833184
United States National Science Foundation (NSF) / Partnerships for Research and Education in Materials (PREM), Grant 1523617

Author's Bibliography

Freeze vs. Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material

Jovanović, Aleksandra A.; Lević, Steva M.; Pavlović, Vladimir B.; Marković, Smilja B.; Pjanović, Rada V.; Đorđević, Verica B.; Nedović, Viktor; Bugarski, Branko M.

(Basel : MDPI AG, 2021)

TY  - JOUR
AU  - Jovanović, Aleksandra A.
AU  - Lević, Steva M.
AU  - Pavlović, Vladimir B.
AU  - Marković, Smilja B.
AU  - Pjanović, Rada V.
AU  - Đorđević, Verica B.
AU  - Nedović, Viktor
AU  - Bugarski, Branko M.
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11798
AB  - Freeze drying was compared with spray drying regarding feasibility to process wild thyme drugs in order to obtain dry formulations at laboratory scale starting from liquid extracts produced by different extraction methods: maceration and heat-, ultrasound-, and microwave-assisted extractions. Higher total powder yield (based on the dry weight prior to extraction) was achieved by freeze than spray drying and lower loss of total polyphenol content (TPC) and total flavonoid content (TFC) due to the drying process. Gelatin as a coating agent (5% w/w) provided better TPC recovery by 70% in case of lyophilization and higher total powder yield in case of spray drying by diminishing material deposition on the wall of the drying chamber. The resulting gelatin-free and gelatin-containing powders carried polyphenols in amount ~190 and 53–75 mg gallic acid equivalents GAE/g of powder, respectively. Microwave-assisted extract formulation was distinguished from the others by a higher content of polyphenols, proteins and sugars, higher bulk density and lower solubility. The type of the drying process mainly affected the position of the gelatin-derived -OH and amide bands in FTIR spectra. Spray-dried formulations compared to freeze-dried expressed higher thermal stability as confirmed by differential scanning calorimetry analysis and a higher diffusion coefficient; the last feature can be associated with the lower specific surface area of irregularly shaped freeze-dried particles (151–223 µm) compared to small microspheres (~8 µm) in spray-dried powder.
PB  - Basel : MDPI AG
T2  - Molecules
T1  - Freeze vs. Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material
SP  - 3933
VL  - 26
IS  - 13
DO  - 10.3390/molecules26133933
UR  - https://hdl.handle.net/21.15107/rcub_dais_11798
ER  - 
@article{
author = "Jovanović, Aleksandra A. and Lević, Steva M. and Pavlović, Vladimir B. and Marković, Smilja B. and Pjanović, Rada V. and Đorđević, Verica B. and Nedović, Viktor and Bugarski, Branko M.",
year = "2021",
abstract = "Freeze drying was compared with spray drying regarding feasibility to process wild thyme drugs in order to obtain dry formulations at laboratory scale starting from liquid extracts produced by different extraction methods: maceration and heat-, ultrasound-, and microwave-assisted extractions. Higher total powder yield (based on the dry weight prior to extraction) was achieved by freeze than spray drying and lower loss of total polyphenol content (TPC) and total flavonoid content (TFC) due to the drying process. Gelatin as a coating agent (5% w/w) provided better TPC recovery by 70% in case of lyophilization and higher total powder yield in case of spray drying by diminishing material deposition on the wall of the drying chamber. The resulting gelatin-free and gelatin-containing powders carried polyphenols in amount ~190 and 53–75 mg gallic acid equivalents GAE/g of powder, respectively. Microwave-assisted extract formulation was distinguished from the others by a higher content of polyphenols, proteins and sugars, higher bulk density and lower solubility. The type of the drying process mainly affected the position of the gelatin-derived -OH and amide bands in FTIR spectra. Spray-dried formulations compared to freeze-dried expressed higher thermal stability as confirmed by differential scanning calorimetry analysis and a higher diffusion coefficient; the last feature can be associated with the lower specific surface area of irregularly shaped freeze-dried particles (151–223 µm) compared to small microspheres (~8 µm) in spray-dried powder.",
publisher = "Basel : MDPI AG",
journal = "Molecules",
title = "Freeze vs. Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material",
pages = "3933",
volume = "26",
number = "13",
doi = "10.3390/molecules26133933",
url = "https://hdl.handle.net/21.15107/rcub_dais_11798"
}
Jovanović, A. A., Lević, S. M., Pavlović, V. B., Marković, S. B., Pjanović, R. V., Đorđević, V. B., Nedović, V.,& Bugarski, B. M.. (2021). Freeze vs. Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material. in Molecules
Basel : MDPI AG., 26(13), 3933.
https://doi.org/10.3390/molecules26133933
https://hdl.handle.net/21.15107/rcub_dais_11798
Jovanović AA, Lević SM, Pavlović VB, Marković SB, Pjanović RV, Đorđević VB, Nedović V, Bugarski BM. Freeze vs. Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material. in Molecules. 2021;26(13):3933.
doi:10.3390/molecules26133933
https://hdl.handle.net/21.15107/rcub_dais_11798 .
Jovanović, Aleksandra A., Lević, Steva M., Pavlović, Vladimir B., Marković, Smilja B., Pjanović, Rada V., Đorđević, Verica B., Nedović, Viktor, Bugarski, Branko M., "Freeze vs. Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material" in Molecules, 26, no. 13 (2021):3933,
https://doi.org/10.3390/molecules26133933 .,
https://hdl.handle.net/21.15107/rcub_dais_11798 .

High Heat Treatment of Goat Cheese Milk. The Effect on Sensory Profile, Consumer Acceptance and Microstructure of Cheese

Miloradović, Zorana; Tomić, Nikola; Kljajević, Nemanja; Lević, Steva; Pavlović, Vladimir B.; Blažić, Marijana; Miočinović, Jelena

(Basel : MDPI AG, 2021)

TY  - JOUR
AU  - Miloradović, Zorana
AU  - Tomić, Nikola
AU  - Kljajević, Nemanja
AU  - Lević, Steva
AU  - Pavlović, Vladimir B.
AU  - Blažić, Marijana
AU  - Miočinović, Jelena
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11644
AB  - Goat cheeses from high heat treated milk (HHTM: 80 °C/5 min (E1) and 90 °C/5 min (E2)), could be regarded as new products, compared to their analogues made from commonly pasteurized milk (65 °C/30 min (C)). Descriptive analysis and consumer tests with a hedonic scale and JAR scale were part of the product development process. The use of scanning electron microscopy enabled deeper insight into the flavor and texture of the cheeses. In all cheese variants, goaty flavor was mildly pronounced. Young HHTM cheeses also had a pronounced whey and cooked/milky flavor. Consumers found such flavor ‘too intensive’. Unlike the control variant, HHTM cheeses were not described as ‘too hard’. Such improvement in texture was found to be a result of fine, highly branched microstructure, sustained over the course of ripening time and highly incorporated milk fat globules inside the cheese mass. Cluster analysis showed that the largest group of consumers (47.5%) preferred E2 cheese. Although consumers found that most of the cheeses were ‘too salty’, this excess did not decrease their overall acceptance. Neither microstructure analysis nor descriptive sensory analysis of goat white brined cheeses produced from high heat treated milk has been done before.
PB  - Basel : MDPI AG
T2  - Foods
T1  - High Heat Treatment of Goat Cheese Milk. The Effect on Sensory Profile, Consumer Acceptance and Microstructure of Cheese
SP  - 1116
VL  - 10
IS  - 5
DO  - 10.3390/foods10051116
UR  - https://hdl.handle.net/21.15107/rcub_dais_11644
ER  - 
@article{
author = "Miloradović, Zorana and Tomić, Nikola and Kljajević, Nemanja and Lević, Steva and Pavlović, Vladimir B. and Blažić, Marijana and Miočinović, Jelena",
year = "2021",
abstract = "Goat cheeses from high heat treated milk (HHTM: 80 °C/5 min (E1) and 90 °C/5 min (E2)), could be regarded as new products, compared to their analogues made from commonly pasteurized milk (65 °C/30 min (C)). Descriptive analysis and consumer tests with a hedonic scale and JAR scale were part of the product development process. The use of scanning electron microscopy enabled deeper insight into the flavor and texture of the cheeses. In all cheese variants, goaty flavor was mildly pronounced. Young HHTM cheeses also had a pronounced whey and cooked/milky flavor. Consumers found such flavor ‘too intensive’. Unlike the control variant, HHTM cheeses were not described as ‘too hard’. Such improvement in texture was found to be a result of fine, highly branched microstructure, sustained over the course of ripening time and highly incorporated milk fat globules inside the cheese mass. Cluster analysis showed that the largest group of consumers (47.5%) preferred E2 cheese. Although consumers found that most of the cheeses were ‘too salty’, this excess did not decrease their overall acceptance. Neither microstructure analysis nor descriptive sensory analysis of goat white brined cheeses produced from high heat treated milk has been done before.",
publisher = "Basel : MDPI AG",
journal = "Foods",
title = "High Heat Treatment of Goat Cheese Milk. The Effect on Sensory Profile, Consumer Acceptance and Microstructure of Cheese",
pages = "1116",
volume = "10",
number = "5",
doi = "10.3390/foods10051116",
url = "https://hdl.handle.net/21.15107/rcub_dais_11644"
}
Miloradović, Z., Tomić, N., Kljajević, N., Lević, S., Pavlović, V. B., Blažić, M.,& Miočinović, J.. (2021). High Heat Treatment of Goat Cheese Milk. The Effect on Sensory Profile, Consumer Acceptance and Microstructure of Cheese. in Foods
Basel : MDPI AG., 10(5), 1116.
https://doi.org/10.3390/foods10051116
https://hdl.handle.net/21.15107/rcub_dais_11644
Miloradović Z, Tomić N, Kljajević N, Lević S, Pavlović VB, Blažić M, Miočinović J. High Heat Treatment of Goat Cheese Milk. The Effect on Sensory Profile, Consumer Acceptance and Microstructure of Cheese. in Foods. 2021;10(5):1116.
doi:10.3390/foods10051116
https://hdl.handle.net/21.15107/rcub_dais_11644 .
Miloradović, Zorana, Tomić, Nikola, Kljajević, Nemanja, Lević, Steva, Pavlović, Vladimir B., Blažić, Marijana, Miočinović, Jelena, "High Heat Treatment of Goat Cheese Milk. The Effect on Sensory Profile, Consumer Acceptance and Microstructure of Cheese" in Foods, 10, no. 5 (2021):1116,
https://doi.org/10.3390/foods10051116 .,
https://hdl.handle.net/21.15107/rcub_dais_11644 .

Freeze versus Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material

Jovanović, Aleksandra A.; Lević, Steva; Pavlović, Vladimir B.; Marković, Smilja; Pjanović, Rada; Đorđević, Verica B.; Nedović, Viktor; Bugarski, Branko

(2021)

TY  - GEN
AU  - Jovanović, Aleksandra A.
AU  - Lević, Steva
AU  - Pavlović, Vladimir B.
AU  - Marković, Smilja
AU  - Pjanović, Rada
AU  - Đorđević, Verica B.
AU  - Nedović, Viktor
AU  - Bugarski, Branko
PY  - 2021
UR  - https://dais.sanu.ac.rs/123456789/11637
AB  - Freeze drying was compared with spray drying regarding feasibility to process wild thyme drug in order to obtain dry formulations at laboratory scale starting from liquid extracts produced by different extraction methods: maceration, heat-, ultrasound-, and microwave-assisted extractions. Higher powder yield (based on the dry weight prior to extraction) was achieved by freeze than spray drying and lower loss of total polyphenol content (TPC) and total flavonoid content (TFC) due to the drying process. Gelatin as a coating agent (5% w/w) provided better TPC recovery by 70% in case of lyophilization and higher powder yield in case of spray drying by diminishing material deposition on the wall of the drying chamber. The resulting gelatin-free and gelatin-containing powders carried polyphenols in amount ~190 and 53-75 mg gallic acid equivalents GAE/g of powder, respectively. Microwave-assisted extract formulation distinguished from others by higher content of polyphenols, proteins and sugars, higher bulk density and lower solubility. The type of the drying process affected mainly position of the gelatin-derived -OH and amide bands in FTIR spectra. Spray dried formulations compared to freeze dried expressed higher thermal stability as confirmed by differential scanning calorimetry analysis and higher diffusion coefficient; the last feature can be associated with the lower specific surface area of irregularly shaped freeze-dried particles (151-223 µm) compared to small microspheres (~8 µm) in spray-dried powder.
T2  - Preprints
T1  - Freeze versus Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material
DO  - 10.20944/preprints202105.0358.v1
UR  - https://hdl.handle.net/21.15107/rcub_dais_11637
ER  - 
@misc{
author = "Jovanović, Aleksandra A. and Lević, Steva and Pavlović, Vladimir B. and Marković, Smilja and Pjanović, Rada and Đorđević, Verica B. and Nedović, Viktor and Bugarski, Branko",
year = "2021",
abstract = "Freeze drying was compared with spray drying regarding feasibility to process wild thyme drug in order to obtain dry formulations at laboratory scale starting from liquid extracts produced by different extraction methods: maceration, heat-, ultrasound-, and microwave-assisted extractions. Higher powder yield (based on the dry weight prior to extraction) was achieved by freeze than spray drying and lower loss of total polyphenol content (TPC) and total flavonoid content (TFC) due to the drying process. Gelatin as a coating agent (5% w/w) provided better TPC recovery by 70% in case of lyophilization and higher powder yield in case of spray drying by diminishing material deposition on the wall of the drying chamber. The resulting gelatin-free and gelatin-containing powders carried polyphenols in amount ~190 and 53-75 mg gallic acid equivalents GAE/g of powder, respectively. Microwave-assisted extract formulation distinguished from others by higher content of polyphenols, proteins and sugars, higher bulk density and lower solubility. The type of the drying process affected mainly position of the gelatin-derived -OH and amide bands in FTIR spectra. Spray dried formulations compared to freeze dried expressed higher thermal stability as confirmed by differential scanning calorimetry analysis and higher diffusion coefficient; the last feature can be associated with the lower specific surface area of irregularly shaped freeze-dried particles (151-223 µm) compared to small microspheres (~8 µm) in spray-dried powder.",
journal = "Preprints",
title = "Freeze versus Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material",
doi = "10.20944/preprints202105.0358.v1",
url = "https://hdl.handle.net/21.15107/rcub_dais_11637"
}
Jovanović, A. A., Lević, S., Pavlović, V. B., Marković, S., Pjanović, R., Đorđević, V. B., Nedović, V.,& Bugarski, B.. (2021). Freeze versus Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material. in Preprints.
https://doi.org/10.20944/preprints202105.0358.v1
https://hdl.handle.net/21.15107/rcub_dais_11637
Jovanović AA, Lević S, Pavlović VB, Marković S, Pjanović R, Đorđević VB, Nedović V, Bugarski B. Freeze versus Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material. in Preprints. 2021;.
doi:10.20944/preprints202105.0358.v1
https://hdl.handle.net/21.15107/rcub_dais_11637 .
Jovanović, Aleksandra A., Lević, Steva, Pavlović, Vladimir B., Marković, Smilja, Pjanović, Rada, Đorđević, Verica B., Nedović, Viktor, Bugarski, Branko, "Freeze versus Spray Drying for Dry Wild Thyme (Thymus serpyllum L.) Extract Formulations: The Impact of Gelatin as a Coating Material" in Preprints (2021),
https://doi.org/10.20944/preprints202105.0358.v1 .,
https://hdl.handle.net/21.15107/rcub_dais_11637 .
1

Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Marković, Smilja; Blagojević, Vladimir A.; Lević, Steva; Savić, Slobodan; Đorđević, Antonije; Pavlović, Vladimir B.

(Springer, 2020)

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Marković, Smilja
AU  - Blagojević, Vladimir A.
AU  - Lević, Steva
AU  - Savić, Slobodan
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/10027
AB  - Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.
PB  - Springer
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics
SP  - 95
EP  - 107
VL  - 140
DO  - 10.1007/s10973-019-08846-w
UR  - https://hdl.handle.net/21.15107/rcub_dais_10027
ER  - 
@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Marković, Smilja and Blagojević, Vladimir A. and Lević, Steva and Savić, Slobodan and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2020",
abstract = "Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.",
publisher = "Springer",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics",
pages = "95-107",
volume = "140",
doi = "10.1007/s10973-019-08846-w",
url = "https://hdl.handle.net/21.15107/rcub_dais_10027"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Marković, S., Blagojević, V. A., Lević, S., Savić, S., Đorđević, A.,& Pavlović, V. B.. (2020). Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry
Springer., 140, 95-107.
https://doi.org/10.1007/s10973-019-08846-w
https://hdl.handle.net/21.15107/rcub_dais_10027
Obradović N, Fahrenholtz WG, Filipović S, Marković S, Blagojević VA, Lević S, Savić S, Đorđević A, Pavlović VB. Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry. 2020;140:95-107.
doi:10.1007/s10973-019-08846-w
https://hdl.handle.net/21.15107/rcub_dais_10027 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Marković, Smilja, Blagojević, Vladimir A., Lević, Steva, Savić, Slobodan, Đorđević, Antonije, Pavlović, Vladimir B., "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics" in Journal of Thermal Analysis and Calorimetry, 140 (2020):95-107,
https://doi.org/10.1007/s10973-019-08846-w .,
https://hdl.handle.net/21.15107/rcub_dais_10027 .
1
2
2

Structure and Properties of Nanocrystalline Tetragonal BaTiO3 Prepared by Combustion Solid State Synthesis

Filipović, Suzana; Anđelković, Ljubica; Jeremić, Dejan; Vulić, Predrag; Nikolić, Aleksandar; Marković, Smilja; Paunović, Vesna; Lević, Steva; Pavlović, Vladimir B.

(Belgrade : ETRAN, 2020)

TY  - JOUR
AU  - Filipović, Suzana
AU  - Anđelković, Ljubica
AU  - Jeremić, Dejan
AU  - Vulić, Predrag
AU  - Nikolić, Aleksandar
AU  - Marković, Smilja
AU  - Paunović, Vesna
AU  - Lević, Steva
AU  - Pavlović, Vladimir B.
PY  - 2020
UR  - https://dais.sanu.ac.rs/123456789/9449
AB  - Barium titanate (BaTiO3) attracts high scientific and technological attention due to good dielectric and electromechanical properties. Although BaTiO3 is one of the most frequently investigated ferroelectric materials, the need for finding new and/or improved synthesis methods of this material still exists. In this paper, a novel, mild synthesis route for producing tetragonal BaTiO3 from barium nitrate and Ti-oxalate precursor is presented. Morphology of the prepared and subsequently sintered BaTiO3 was determined by SEM. Particle size distribution of the as prepared powder was monitored by the laser diffraction. The phase composition, structure and lattice dynamics were investigated by XRD and Raman spectroscopy. Finally, dielectric parameters were determined in the temperature range from 30 to 180 degrees C, and within a variety of frequencies. Curie temperature was detected at 130 degrees C.
PB  - Belgrade : ETRAN
T2  - Science of Sintering
T1  - Structure and Properties of Nanocrystalline Tetragonal BaTiO3 Prepared by Combustion Solid State Synthesis
SP  - 257
EP  - 268
VL  - 52
DO  - 10.2298/SOS2003257F
UR  - https://hdl.handle.net/21.15107/rcub_dais_9449
ER  - 
@article{
author = "Filipović, Suzana and Anđelković, Ljubica and Jeremić, Dejan and Vulić, Predrag and Nikolić, Aleksandar and Marković, Smilja and Paunović, Vesna and Lević, Steva and Pavlović, Vladimir B.",
year = "2020",
abstract = "Barium titanate (BaTiO3) attracts high scientific and technological attention due to good dielectric and electromechanical properties. Although BaTiO3 is one of the most frequently investigated ferroelectric materials, the need for finding new and/or improved synthesis methods of this material still exists. In this paper, a novel, mild synthesis route for producing tetragonal BaTiO3 from barium nitrate and Ti-oxalate precursor is presented. Morphology of the prepared and subsequently sintered BaTiO3 was determined by SEM. Particle size distribution of the as prepared powder was monitored by the laser diffraction. The phase composition, structure and lattice dynamics were investigated by XRD and Raman spectroscopy. Finally, dielectric parameters were determined in the temperature range from 30 to 180 degrees C, and within a variety of frequencies. Curie temperature was detected at 130 degrees C.",
publisher = "Belgrade : ETRAN",
journal = "Science of Sintering",
title = "Structure and Properties of Nanocrystalline Tetragonal BaTiO3 Prepared by Combustion Solid State Synthesis",
pages = "257-268",
volume = "52",
doi = "10.2298/SOS2003257F",
url = "https://hdl.handle.net/21.15107/rcub_dais_9449"
}
Filipović, S., Anđelković, L., Jeremić, D., Vulić, P., Nikolić, A., Marković, S., Paunović, V., Lević, S.,& Pavlović, V. B.. (2020). Structure and Properties of Nanocrystalline Tetragonal BaTiO3 Prepared by Combustion Solid State Synthesis. in Science of Sintering
Belgrade : ETRAN., 52, 257-268.
https://doi.org/10.2298/SOS2003257F
https://hdl.handle.net/21.15107/rcub_dais_9449
Filipović S, Anđelković L, Jeremić D, Vulić P, Nikolić A, Marković S, Paunović V, Lević S, Pavlović VB. Structure and Properties of Nanocrystalline Tetragonal BaTiO3 Prepared by Combustion Solid State Synthesis. in Science of Sintering. 2020;52:257-268.
doi:10.2298/SOS2003257F
https://hdl.handle.net/21.15107/rcub_dais_9449 .
Filipović, Suzana, Anđelković, Ljubica, Jeremić, Dejan, Vulić, Predrag, Nikolić, Aleksandar, Marković, Smilja, Paunović, Vesna, Lević, Steva, Pavlović, Vladimir B., "Structure and Properties of Nanocrystalline Tetragonal BaTiO3 Prepared by Combustion Solid State Synthesis" in Science of Sintering, 52 (2020):257-268,
https://doi.org/10.2298/SOS2003257F .,
https://hdl.handle.net/21.15107/rcub_dais_9449 .

Rheology and Microstructures of Rennet Gels from Differently Heated Goat Milk

Miloradović, Zorana; Kljajević, Nemanja; Miočinović, Jelena; Lević, Steva; Pavlović, Vladimir B.; Blažić, Marijana; Puđa, Predrag

(Basel : MDPI, 2020)

TY  - JOUR
AU  - Miloradović, Zorana
AU  - Kljajević, Nemanja
AU  - Miočinović, Jelena
AU  - Lević, Steva
AU  - Pavlović, Vladimir B.
AU  - Blažić, Marijana
AU  - Puđa, Predrag
PY  - 2020
UR  - https://www.mdpi.com/2304-8158/9/3/283
UR  - http://dais.sanu.ac.rs/123456789/8955
AB  - Rennet coagulation of goat milk heated to 65 °C/30 min (Gc), 80 °C/5 min (G8) and 90 °C/5 min (G9) was studied. A rheometer equipped with a vane geometry tool was used to measure milk coagulation parameters and viscoelastic properties of rennet gels. Yield parameters: curd yield, laboratory curd yield and curd yield efficiency were measured and calculated. Scanning electron microscopy of rennet gels was conducted. Storage moduli (G’) of gels at the moment of cutting were 19.9 ± 1.71 Pa (Gc), 11.9 ± 1.96 Pa (G8) and 7.3 ± 1.46 Pa (G9). Aggregation rate and curd firmness decreased with the increase of milk heating temperature, while coagulation time did not change significantly. High heat treatment of goat milk had a significant effect on both laboratory curd yield and curd yield. However, laboratory curd yield (27.7 ± 1.84%) of the G9 treatment was unreasonably high compared to curd yield (15.4 ± 0.60%). The microstructure of G9 was notably different compared to Gc and G8, with a denser and more compact microstructure, smaller paracasein micelles and void spaces in a form of cracks indicating weaker cross links. The findings of this study might serve as the bases for the development of different cheese types produced from high-heat-treated goat milk.
PB  - Basel : MDPI
T2  - Foods
T1  - Rheology and Microstructures of Rennet Gels from Differently Heated Goat Milk
SP  - 283
VL  - 9
IS  - 3
DO  - 10.3390/foods9030283
UR  - https://hdl.handle.net/21.15107/rcub_dais_8955
ER  - 
@article{
author = "Miloradović, Zorana and Kljajević, Nemanja and Miočinović, Jelena and Lević, Steva and Pavlović, Vladimir B. and Blažić, Marijana and Puđa, Predrag",
year = "2020",
abstract = "Rennet coagulation of goat milk heated to 65 °C/30 min (Gc), 80 °C/5 min (G8) and 90 °C/5 min (G9) was studied. A rheometer equipped with a vane geometry tool was used to measure milk coagulation parameters and viscoelastic properties of rennet gels. Yield parameters: curd yield, laboratory curd yield and curd yield efficiency were measured and calculated. Scanning electron microscopy of rennet gels was conducted. Storage moduli (G’) of gels at the moment of cutting were 19.9 ± 1.71 Pa (Gc), 11.9 ± 1.96 Pa (G8) and 7.3 ± 1.46 Pa (G9). Aggregation rate and curd firmness decreased with the increase of milk heating temperature, while coagulation time did not change significantly. High heat treatment of goat milk had a significant effect on both laboratory curd yield and curd yield. However, laboratory curd yield (27.7 ± 1.84%) of the G9 treatment was unreasonably high compared to curd yield (15.4 ± 0.60%). The microstructure of G9 was notably different compared to Gc and G8, with a denser and more compact microstructure, smaller paracasein micelles and void spaces in a form of cracks indicating weaker cross links. The findings of this study might serve as the bases for the development of different cheese types produced from high-heat-treated goat milk.",
publisher = "Basel : MDPI",
journal = "Foods",
title = "Rheology and Microstructures of Rennet Gels from Differently Heated Goat Milk",
pages = "283",
volume = "9",
number = "3",
doi = "10.3390/foods9030283",
url = "https://hdl.handle.net/21.15107/rcub_dais_8955"
}
Miloradović, Z., Kljajević, N., Miočinović, J., Lević, S., Pavlović, V. B., Blažić, M.,& Puđa, P.. (2020). Rheology and Microstructures of Rennet Gels from Differently Heated Goat Milk. in Foods
Basel : MDPI., 9(3), 283.
https://doi.org/10.3390/foods9030283
https://hdl.handle.net/21.15107/rcub_dais_8955
Miloradović Z, Kljajević N, Miočinović J, Lević S, Pavlović VB, Blažić M, Puđa P. Rheology and Microstructures of Rennet Gels from Differently Heated Goat Milk. in Foods. 2020;9(3):283.
doi:10.3390/foods9030283
https://hdl.handle.net/21.15107/rcub_dais_8955 .
Miloradović, Zorana, Kljajević, Nemanja, Miočinović, Jelena, Lević, Steva, Pavlović, Vladimir B., Blažić, Marijana, Puđa, Predrag, "Rheology and Microstructures of Rennet Gels from Differently Heated Goat Milk" in Foods, 9, no. 3 (2020):283,
https://doi.org/10.3390/foods9030283 .,
https://hdl.handle.net/21.15107/rcub_dais_8955 .
4
1
2

Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Marković, Smilja; Blagojević, Vladimir A.; Lević, Steva; Savić, Slobodan; Đorđević, Antonije; Pavlović, Vladimir B.

(Springer, 2020)

TY  - JOUR
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Marković, Smilja
AU  - Blagojević, Vladimir A.
AU  - Lević, Steva
AU  - Savić, Slobodan
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2020
UR  - http://dais.sanu.ac.rs/123456789/6910
AB  - Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.
PB  - Springer
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics
SP  - 95
EP  - 107
VL  - 140
DO  - 10.1007/s10973-019-08846-w
UR  - https://hdl.handle.net/21.15107/rcub_dais_6910
ER  - 
@article{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Marković, Smilja and Blagojević, Vladimir A. and Lević, Steva and Savić, Slobodan and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2020",
abstract = "Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.",
publisher = "Springer",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics",
pages = "95-107",
volume = "140",
doi = "10.1007/s10973-019-08846-w",
url = "https://hdl.handle.net/21.15107/rcub_dais_6910"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Marković, S., Blagojević, V. A., Lević, S., Savić, S., Đorđević, A.,& Pavlović, V. B.. (2020). Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry
Springer., 140, 95-107.
https://doi.org/10.1007/s10973-019-08846-w
https://hdl.handle.net/21.15107/rcub_dais_6910
Obradović N, Fahrenholtz WG, Filipović S, Marković S, Blagojević VA, Lević S, Savić S, Đorđević A, Pavlović VB. Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry. 2020;140:95-107.
doi:10.1007/s10973-019-08846-w
https://hdl.handle.net/21.15107/rcub_dais_6910 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Marković, Smilja, Blagojević, Vladimir A., Lević, Steva, Savić, Slobodan, Đorđević, Antonije, Pavlović, Vladimir B., "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics" in Journal of Thermal Analysis and Calorimetry, 140 (2020):95-107,
https://doi.org/10.1007/s10973-019-08846-w .,
https://hdl.handle.net/21.15107/rcub_dais_6910 .
1
2
2

Morphological and structural characterization of spinel MgAl2O4

Filipović, Suzana; Obradović, Nina; Fahrenholtz, William G.; Marinković, Bojan A.; Rogan, Jelena; Lević, Steva; Pavlović, Vladimir B.

(Belgrade : Serbian Ceramic Society, 2019)

TY  - CONF
AU  - Filipović, Suzana
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Marinković, Bojan A.
AU  - Rogan, Jelena
AU  - Lević, Steva
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6779
AB  - Magnesium aluminate has spinel structure and very good mechanical, chemical, and thermal properties. Owing to these properties, it has a wide range of applications including refractory ceramics, optically transparent ceramic windows and armors. Its low dielectric permeability and low loss tangent enable its using for integrated electronic devices, as well. Furthermore, as a porous ceramic, magnesium aluminate has important application as humidity sensor, catalyst and filter for waste water purification. In this paper, synthesis and characterization of MgAl2O4 was performed. Stochiometric ratio of MgO and Al2O3powders was mixed and calcined within the temperatures range 1500-1800 oC to produce pure spinel phase. Thereafter pellets were crushed and treated in planetary ball mill for 60 minutes to obtained fine grain. All powders, calcined and milled, were examined for phase composition, crystal structure, and morphology. The obtained results showed that by increasing the temperature denser samples but more fragile have been synthesized. Milling for 1 hour leads to crumble of bigger particles and getting finer, single phase powders. XRPD and Raman spectroscopy showed disorder in crystal structure after milling.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019
T1  - Morphological and structural characterization of spinel MgAl2O4
SP  - 32
EP  - 32
UR  - https://hdl.handle.net/21.15107/rcub_dais_6779
ER  - 
@conference{
author = "Filipović, Suzana and Obradović, Nina and Fahrenholtz, William G. and Marinković, Bojan A. and Rogan, Jelena and Lević, Steva and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate has spinel structure and very good mechanical, chemical, and thermal properties. Owing to these properties, it has a wide range of applications including refractory ceramics, optically transparent ceramic windows and armors. Its low dielectric permeability and low loss tangent enable its using for integrated electronic devices, as well. Furthermore, as a porous ceramic, magnesium aluminate has important application as humidity sensor, catalyst and filter for waste water purification. In this paper, synthesis and characterization of MgAl2O4 was performed. Stochiometric ratio of MgO and Al2O3powders was mixed and calcined within the temperatures range 1500-1800 oC to produce pure spinel phase. Thereafter pellets were crushed and treated in planetary ball mill for 60 minutes to obtained fine grain. All powders, calcined and milled, were examined for phase composition, crystal structure, and morphology. The obtained results showed that by increasing the temperature denser samples but more fragile have been synthesized. Milling for 1 hour leads to crumble of bigger particles and getting finer, single phase powders. XRPD and Raman spectroscopy showed disorder in crystal structure after milling.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019",
title = "Morphological and structural characterization of spinel MgAl2O4",
pages = "32-32",
url = "https://hdl.handle.net/21.15107/rcub_dais_6779"
}
Filipović, S., Obradović, N., Fahrenholtz, W. G., Marinković, B. A., Rogan, J., Lević, S.,& Pavlović, V. B.. (2019). Morphological and structural characterization of spinel MgAl2O4. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019
Belgrade : Serbian Ceramic Society., 32-32.
https://hdl.handle.net/21.15107/rcub_dais_6779
Filipović S, Obradović N, Fahrenholtz WG, Marinković BA, Rogan J, Lević S, Pavlović VB. Morphological and structural characterization of spinel MgAl2O4. in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019. 2019;:32-32.
https://hdl.handle.net/21.15107/rcub_dais_6779 .
Filipović, Suzana, Obradović, Nina, Fahrenholtz, William G., Marinković, Bojan A., Rogan, Jelena, Lević, Steva, Pavlović, Vladimir B., "Morphological and structural characterization of spinel MgAl2O4" in Program and the Book of abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VIII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 23-25. September 2019 (2019):32-32,
https://hdl.handle.net/21.15107/rcub_dais_6779 .

Influence of mechanical activation on kinetics and formation of spinel monitored by DTA

Obradović, Nina; Fahrenholtz, William G.; Filipović, Suzana; Marković, Smilja; Blagojević, Vladimir A.; Lević, Steva; Đorđević, Antonije; Pavlović, Vladimir B.

(Central and Eastern European Committee for Thermal Analysis and Calorimetry, 2019)

TY  - CONF
AU  - Obradović, Nina
AU  - Fahrenholtz, William G.
AU  - Filipović, Suzana
AU  - Marković, Smilja
AU  - Blagojević, Vladimir A.
AU  - Lević, Steva
AU  - Đorđević, Antonije
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/7020
AB  - Magnesium aluminate and other alumina-based spinels are refractory ceramics with excellent properties, such as high hardness, high mechanical strength, and low dielectric constant, applicable in many modern industries. MgAl2O4 was produced by solid state reaction between MgO and alpha-Al2O3 powders. Mechanical activation represents a very efficient method for increasing the reactivity of powders, accelerating chemical reactions and decreasing the sintering temperatures. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 60 minutes. Sintering was performed in air at temperatures ranging from 1200°C to 1600 °C with a 2 h dwell time. Initial powders and sintered samples were characterized using X-ray diffraction and scanning electron microscopy. Differential thermal analysis (DTA) and thermal gravimetry (TG) were used to determine the temperatures for synthesis reactions and phase transformations. Based on the DTA results, several different processes occured during heating, including evaporation of physisorbed water, decomposition of Mg(OH)2, and spinel formation. With mechanical activation, all characteristic temperatures shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of sintering temperature for all of the sintered specimens.
PB  - Central and Eastern European Committee for Thermal Analysis and Calorimetry
C3  - Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019)
T1  - Influence of mechanical activation on kinetics and formation of spinel monitored by DTA
SP  - 70
EP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_dais_7020
ER  - 
@conference{
author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Marković, Smilja and Blagojević, Vladimir A. and Lević, Steva and Đorđević, Antonije and Pavlović, Vladimir B.",
year = "2019",
abstract = "Magnesium aluminate and other alumina-based spinels are refractory ceramics with excellent properties, such as high hardness, high mechanical strength, and low dielectric constant, applicable in many modern industries. MgAl2O4 was produced by solid state reaction between MgO and alpha-Al2O3 powders. Mechanical activation represents a very efficient method for increasing the reactivity of powders, accelerating chemical reactions and decreasing the sintering temperatures. Mechanical activation of mixed powders was performed in a high-energy planetary ball mill in air for 60 minutes. Sintering was performed in air at temperatures ranging from 1200°C to 1600 °C with a 2 h dwell time. Initial powders and sintered samples were characterized using X-ray diffraction and scanning electron microscopy. Differential thermal analysis (DTA) and thermal gravimetry (TG) were used to determine the temperatures for synthesis reactions and phase transformations. Based on the DTA results, several different processes occured during heating, including evaporation of physisorbed water, decomposition of Mg(OH)2, and spinel formation. With mechanical activation, all characteristic temperatures shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of sintering temperature for all of the sintered specimens.",
publisher = "Central and Eastern European Committee for Thermal Analysis and Calorimetry",
journal = "Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019)",
title = "Influence of mechanical activation on kinetics and formation of spinel monitored by DTA",
pages = "70-70",
url = "https://hdl.handle.net/21.15107/rcub_dais_7020"
}
Obradović, N., Fahrenholtz, W. G., Filipović, S., Marković, S., Blagojević, V. A., Lević, S., Đorđević, A.,& Pavlović, V. B.. (2019). Influence of mechanical activation on kinetics and formation of spinel monitored by DTA. in Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019)
Central and Eastern European Committee for Thermal Analysis and Calorimetry., 70-70.
https://hdl.handle.net/21.15107/rcub_dais_7020
Obradović N, Fahrenholtz WG, Filipović S, Marković S, Blagojević VA, Lević S, Đorđević A, Pavlović VB. Influence of mechanical activation on kinetics and formation of spinel monitored by DTA. in Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019). 2019;:70-70.
https://hdl.handle.net/21.15107/rcub_dais_7020 .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Marković, Smilja, Blagojević, Vladimir A., Lević, Steva, Đorđević, Antonije, Pavlović, Vladimir B., "Influence of mechanical activation on kinetics and formation of spinel monitored by DTA" in Book of abstracts of the 5th Central and Eastern European Conference on Thermal Analysis and Calorimetry (CEEC-TAC5) and 14th Mediterranean Conference on Calorimetry and Thermal Analysis (Medicta2019) (2019):70-70,
https://hdl.handle.net/21.15107/rcub_dais_7020 .

Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure

Filipović, Suzana; Pavlović, Vera P.; Mitrić, Miodrag; Lević, Steva; Mitrović, Nebojša; Maričić, Aleksa; Vlahović, Branislav; Pavlović, Vladimir B.

(Springer, 2019)

TY  - JOUR
AU  - Filipović, Suzana
AU  - Pavlović, Vera P.
AU  - Mitrić, Miodrag
AU  - Lević, Steva
AU  - Mitrović, Nebojša
AU  - Maričić, Aleksa
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - https://doi.org/10.1007/s40145-018-0301-5
UR  - http://dais.sanu.ac.rs/123456789/5271
AB  - Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity between the phases, resulting in superior dielectric and magneto electric properties. In this study, the influence of preparation condition on structure and properties of BaTiO3/α-Fe2O3 core/shell composite materials was examined. The five samples were obtained by varying synthesis conditions, such as synthesized method (co-precipitation and sonochemical method) and pH values of solution. XRD and Raman spectroscopy analyses were performed in order to determine phase composition and structural changes within samples. Morphology modifications were examined by SEM and EDS analyses. Finally, effect of structural and microstructural changes on magnetic and electrical properties was detected and explained.
PB  - Springer
T2  - Journal of Advanced Ceramics
T1  - Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure
SP  - 133
EP  - 147
VL  - 8
IS  - 1
DO  - 10.1007/s40145-018-0301-5
UR  - https://hdl.handle.net/21.15107/rcub_dais_5271
ER  - 
@article{
author = "Filipović, Suzana and Pavlović, Vera P. and Mitrić, Miodrag and Lević, Steva and Mitrović, Nebojša and Maričić, Aleksa and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2019",
abstract = "Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity between the phases, resulting in superior dielectric and magneto electric properties. In this study, the influence of preparation condition on structure and properties of BaTiO3/α-Fe2O3 core/shell composite materials was examined. The five samples were obtained by varying synthesis conditions, such as synthesized method (co-precipitation and sonochemical method) and pH values of solution. XRD and Raman spectroscopy analyses were performed in order to determine phase composition and structural changes within samples. Morphology modifications were examined by SEM and EDS analyses. Finally, effect of structural and microstructural changes on magnetic and electrical properties was detected and explained.",
publisher = "Springer",
journal = "Journal of Advanced Ceramics",
title = "Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure",
pages = "133-147",
volume = "8",
number = "1",
doi = "10.1007/s40145-018-0301-5",
url = "https://hdl.handle.net/21.15107/rcub_dais_5271"
}
Filipović, S., Pavlović, V. P., Mitrić, M., Lević, S., Mitrović, N., Maričić, A., Vlahović, B.,& Pavlović, V. B.. (2019). Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure. in Journal of Advanced Ceramics
Springer., 8(1), 133-147.
https://doi.org/10.1007/s40145-018-0301-5
https://hdl.handle.net/21.15107/rcub_dais_5271
Filipović S, Pavlović VP, Mitrić M, Lević S, Mitrović N, Maričić A, Vlahović B, Pavlović VB. Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure. in Journal of Advanced Ceramics. 2019;8(1):133-147.
doi:10.1007/s40145-018-0301-5
https://hdl.handle.net/21.15107/rcub_dais_5271 .
Filipović, Suzana, Pavlović, Vera P., Mitrić, Miodrag, Lević, Steva, Mitrović, Nebojša, Maričić, Aleksa, Vlahović, Branislav, Pavlović, Vladimir B., "Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure" in Journal of Advanced Ceramics, 8, no. 1 (2019):133-147,
https://doi.org/10.1007/s40145-018-0301-5 .,
https://hdl.handle.net/21.15107/rcub_dais_5271 .
1
5
7
6

Želatin kao nosač za isporuku polifenolnih komponenata

Jovanović, Aleksandra; Đorđević, Verica; Lević, Steva; Marković, Smilja; Pavlović, Vladimir B.; Nedović, Viktor; Bugarski, Branko

(Belgrade : Union of Engineers and Technicians of Serbia, 2017)

TY  - JOUR
AU  - Jovanović, Aleksandra
AU  - Đorđević, Verica
AU  - Lević, Steva
AU  - Marković, Smilja
AU  - Pavlović, Vladimir B.
AU  - Nedović, Viktor
AU  - Bugarski, Branko
PY  - 2017
UR  - http://www.ncbi.nlm.nih.gov/pubmed/0040-21761705633J
UR  - https://dais.sanu.ac.rs/123456789/11623
AB  - In the present study, the influence of different encapsulation techniques (lyophilization and spray drying) on gelatin, as a carrier system for delivery of polyphenols compounds, on wild thyme extracts and on encapsulated extracts was investigated. FTIR analyses has shown the presence of carbohydrates, polysaccharides, polyphenols, flavonoids, monoterpenes and carboxylates in the dried extracts, while FTIR spectrum of the encapsulated extracts has shown almost exclusively gelatin-based stripes, indicating the efficient encapsulation of the active ingredients of the extracts and therefore their protection. Scanning electron microscopy has shown that the lyophilization process produced irregularly shaped particles, while spray drying formed spherical and pseudo-spherical particles with rough surface. Using the method of diffraction of laser light, it has been found that spray dried encapsulate possessed significantly lower particle size and significantly better uniformity in comparison to the lyophilized sample. According to the results obtained in differential scanning calorimetry, endothermic peak of lyophilized gelatin encapsulate appeared at higher temperature, thus it can be concluded that lyophilized sample was more thermostable than spray dried parallel. Additionally, the values of enthalpy of gelatin encapsulates were significantly higher compared to pure extracts, which confirmed the presence of stabilizing interactions between the encapsulated components and a carrier.
AB  - U prikazanoj studiji ispitan je uticaj različitih metoda inkapsulacije (liofilizacije i sprej sušenja) na želatin, kao nosač polifenolnih komponenata, na ekstrakte majčine dušice i na njihove želatinske inkapsulate. FTIR analiza je pokazala prisustvo ugljenih hidrata, polisaharida, polifenolnih komponenata, flavonoida, monoterpena i karboksilata u osušenim ekstraktima, dok su FTIR spektri inkapsulata pokazali isključivo trake koje potiču od želatina, što ukazuje na efikasno obavijanje aktivnih komponenata ekstrakata i samim tim njihovu zaštitu. Skenirajuća elektronska mikroskopija je pokazala da proces liofilizacije daje čestice nepravilnog oblika, dok se sprej sušenjem formiraju male čestice sferičnog i pseudo-sferičnog oblika, sa neravnom površinom. Primenom difrakcije laserske svetlosti utvrđeno je da veličina čestica sprej osušenog inkapsulata ima značajno manju vrednost i da je uniformnost značajno veća nego kod liofilizovane paralele. Ispitivanjem termičkih karakteristika, primenom diferencijalne skenirajuće kalorimetrije, pokazano je da se kod liofilizovanog želatinskog inkapsulata endotermni pik nalazi na višoj temperaturi, te se može zaključiti da je pomenuti uzorak termički stabilniji u odnosu na sprej osušen. Dodatno, vrednosti promene entalpije želatinskih inkapsulata ekstrakata bile su značajno veće nego kod čistih ekstrakata, što svedoči o prisustvu stabilizirajućih interakcija između inkapsuliranih komponenata i nosača.
PB  - Belgrade : Union of Engineers and Technicians of Serbia
T2  - Tehnika
T1  - Želatin kao nosač za isporuku polifenolnih komponenata
T1  - Gelatin as a carrier system for delivery of polyphenols compounds
SP  - 633
EP  - 639
VL  - 72
IS  - 5
DO  - 10.5937/tehnika1705633J
UR  - https://hdl.handle.net/21.15107/rcub_dais_11623
ER  - 
@article{
author = "Jovanović, Aleksandra and Đorđević, Verica and Lević, Steva and Marković, Smilja and Pavlović, Vladimir B. and Nedović, Viktor and Bugarski, Branko",
year = "2017",
abstract = "In the present study, the influence of different encapsulation techniques (lyophilization and spray drying) on gelatin, as a carrier system for delivery of polyphenols compounds, on wild thyme extracts and on encapsulated extracts was investigated. FTIR analyses has shown the presence of carbohydrates, polysaccharides, polyphenols, flavonoids, monoterpenes and carboxylates in the dried extracts, while FTIR spectrum of the encapsulated extracts has shown almost exclusively gelatin-based stripes, indicating the efficient encapsulation of the active ingredients of the extracts and therefore their protection. Scanning electron microscopy has shown that the lyophilization process produced irregularly shaped particles, while spray drying formed spherical and pseudo-spherical particles with rough surface. Using the method of diffraction of laser light, it has been found that spray dried encapsulate possessed significantly lower particle size and significantly better uniformity in comparison to the lyophilized sample. According to the results obtained in differential scanning calorimetry, endothermic peak of lyophilized gelatin encapsulate appeared at higher temperature, thus it can be concluded that lyophilized sample was more thermostable than spray dried parallel. Additionally, the values of enthalpy of gelatin encapsulates were significantly higher compared to pure extracts, which confirmed the presence of stabilizing interactions between the encapsulated components and a carrier., U prikazanoj studiji ispitan je uticaj različitih metoda inkapsulacije (liofilizacije i sprej sušenja) na želatin, kao nosač polifenolnih komponenata, na ekstrakte majčine dušice i na njihove želatinske inkapsulate. FTIR analiza je pokazala prisustvo ugljenih hidrata, polisaharida, polifenolnih komponenata, flavonoida, monoterpena i karboksilata u osušenim ekstraktima, dok su FTIR spektri inkapsulata pokazali isključivo trake koje potiču od želatina, što ukazuje na efikasno obavijanje aktivnih komponenata ekstrakata i samim tim njihovu zaštitu. Skenirajuća elektronska mikroskopija je pokazala da proces liofilizacije daje čestice nepravilnog oblika, dok se sprej sušenjem formiraju male čestice sferičnog i pseudo-sferičnog oblika, sa neravnom površinom. Primenom difrakcije laserske svetlosti utvrđeno je da veličina čestica sprej osušenog inkapsulata ima značajno manju vrednost i da je uniformnost značajno veća nego kod liofilizovane paralele. Ispitivanjem termičkih karakteristika, primenom diferencijalne skenirajuće kalorimetrije, pokazano je da se kod liofilizovanog želatinskog inkapsulata endotermni pik nalazi na višoj temperaturi, te se može zaključiti da je pomenuti uzorak termički stabilniji u odnosu na sprej osušen. Dodatno, vrednosti promene entalpije želatinskih inkapsulata ekstrakata bile su značajno veće nego kod čistih ekstrakata, što svedoči o prisustvu stabilizirajućih interakcija između inkapsuliranih komponenata i nosača.",
publisher = "Belgrade : Union of Engineers and Technicians of Serbia",
journal = "Tehnika",
title = "Želatin kao nosač za isporuku polifenolnih komponenata, Gelatin as a carrier system for delivery of polyphenols compounds",
pages = "633-639",
volume = "72",
number = "5",
doi = "10.5937/tehnika1705633J",
url = "https://hdl.handle.net/21.15107/rcub_dais_11623"
}
Jovanović, A., Đorđević, V., Lević, S., Marković, S., Pavlović, V. B., Nedović, V.,& Bugarski, B.. (2017). Želatin kao nosač za isporuku polifenolnih komponenata. in Tehnika
Belgrade : Union of Engineers and Technicians of Serbia., 72(5), 633-639.
https://doi.org/10.5937/tehnika1705633J
https://hdl.handle.net/21.15107/rcub_dais_11623
Jovanović A, Đorđević V, Lević S, Marković S, Pavlović VB, Nedović V, Bugarski B. Želatin kao nosač za isporuku polifenolnih komponenata. in Tehnika. 2017;72(5):633-639.
doi:10.5937/tehnika1705633J
https://hdl.handle.net/21.15107/rcub_dais_11623 .
Jovanović, Aleksandra, Đorđević, Verica, Lević, Steva, Marković, Smilja, Pavlović, Vladimir B., Nedović, Viktor, Bugarski, Branko, "Želatin kao nosač za isporuku polifenolnih komponenata" in Tehnika, 72, no. 5 (2017):633-639,
https://doi.org/10.5937/tehnika1705633J .,
https://hdl.handle.net/21.15107/rcub_dais_11623 .

Influence of point defects concentration on optical and photocatalytic properties of ZnO ceramics

Marković, Smilja; Rajić, Vladimir B.; Veselinović, Ljiljana; Belošević Čavor, Jelena; Škapin, Srečo Davor; Stojadinović, Stevan; Rac, Vladislav; Lević, Steva; Mojović, Miloš; Uskoković, Dragan

(Belgrade : Materials Research Society of Serbia, 2016)

TY  - CONF
AU  - Marković, Smilja
AU  - Rajić, Vladimir B.
AU  - Veselinović, Ljiljana
AU  - Belošević Čavor, Jelena
AU  - Škapin, Srečo Davor
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Lević, Steva
AU  - Mojović, Miloš
AU  - Uskoković, Dragan
PY  - 2016
UR  - http://dais.sanu.ac.rs/123456789/902
AB  - Zinc oxide is one of the most studied materials due to its wide bandgap (3.37 eV) and large exciton binding energy (60 meV) which enables application in electronics, optoelectronics and spintronics. In the forms of single crystal and thin-film ZnO are used as UV and blue light emitter, while sintered ZnO-based ceramics are important as varistors, thermistors or semiconductors. It has been found that point defects in the crystal structure of a ZnO strongly influenced its electrical and optical properties. Neutral oxygen vacancies are considered to be a major component of the defect structure of ZnO. Thus, correlation of the oxygen vacancies concentration with band gap energy of ZnO product is important to its application in optoelectronic devices. In this study we investigated the influence of point defects concentration in ZnO crystal structure on its optical and photocatalytic properties. We analyzed ZnO powders prepared by different techniques: (a) microwave processing of precipitate and (b) hydrothermal processing, which yield different ordered crystal structure. To increase a concentration of the point defects in the crystal structure, the powders were sintered in air atmosphere by heating rate of 10 °/min up to 1100 °C, with dwell time of 1 h. The crystal structure, average crystallite size and phase purity of the ZnO ceramics were determined by X-ray diffraction and Raman spectroscopy. The optical properties, in particular, absorption capacity and bang gap energy, were studied using UV–Vis diffuse reflectance spectroscopy. To reveal the role of microstructures and point defects in ZnO crystal lattice, which are receptive for luminescence and photocatalytic activity of this functional oxide, photoluminescence (PL), photoluminescence excitation (PLE) and EPR spectra were analyzed. The influence of point defects concentration in the ZnO crystal structure on photocatalytic properties was examined via decolorization of methylene blue under direct sunlight irradiation. Correlation between amount of the point defects, absorption capacity and photocatalytic efficiency were established. In order to clarify the experimental results ab initio calculations based on density functional theory (DFT) were performed.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016
T1  - Influence of point defects concentration on optical and photocatalytic properties of ZnO ceramics
SP  - 34
EP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_dais_902
ER  - 
@conference{
author = "Marković, Smilja and Rajić, Vladimir B. and Veselinović, Ljiljana and Belošević Čavor, Jelena and Škapin, Srečo Davor and Stojadinović, Stevan and Rac, Vladislav and Lević, Steva and Mojović, Miloš and Uskoković, Dragan",
year = "2016",
abstract = "Zinc oxide is one of the most studied materials due to its wide bandgap (3.37 eV) and large exciton binding energy (60 meV) which enables application in electronics, optoelectronics and spintronics. In the forms of single crystal and thin-film ZnO are used as UV and blue light emitter, while sintered ZnO-based ceramics are important as varistors, thermistors or semiconductors. It has been found that point defects in the crystal structure of a ZnO strongly influenced its electrical and optical properties. Neutral oxygen vacancies are considered to be a major component of the defect structure of ZnO. Thus, correlation of the oxygen vacancies concentration with band gap energy of ZnO product is important to its application in optoelectronic devices. In this study we investigated the influence of point defects concentration in ZnO crystal structure on its optical and photocatalytic properties. We analyzed ZnO powders prepared by different techniques: (a) microwave processing of precipitate and (b) hydrothermal processing, which yield different ordered crystal structure. To increase a concentration of the point defects in the crystal structure, the powders were sintered in air atmosphere by heating rate of 10 °/min up to 1100 °C, with dwell time of 1 h. The crystal structure, average crystallite size and phase purity of the ZnO ceramics were determined by X-ray diffraction and Raman spectroscopy. The optical properties, in particular, absorption capacity and bang gap energy, were studied using UV–Vis diffuse reflectance spectroscopy. To reveal the role of microstructures and point defects in ZnO crystal lattice, which are receptive for luminescence and photocatalytic activity of this functional oxide, photoluminescence (PL), photoluminescence excitation (PLE) and EPR spectra were analyzed. The influence of point defects concentration in the ZnO crystal structure on photocatalytic properties was examined via decolorization of methylene blue under direct sunlight irradiation. Correlation between amount of the point defects, absorption capacity and photocatalytic efficiency were established. In order to clarify the experimental results ab initio calculations based on density functional theory (DFT) were performed.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016",
title = "Influence of point defects concentration on optical and photocatalytic properties of ZnO ceramics",
pages = "34-34",
url = "https://hdl.handle.net/21.15107/rcub_dais_902"
}
Marković, S., Rajić, V. B., Veselinović, L., Belošević Čavor, J., Škapin, S. D., Stojadinović, S., Rac, V., Lević, S., Mojović, M.,& Uskoković, D.. (2016). Influence of point defects concentration on optical and photocatalytic properties of ZnO ceramics. in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016
Belgrade : Materials Research Society of Serbia., 34-34.
https://hdl.handle.net/21.15107/rcub_dais_902
Marković S, Rajić VB, Veselinović L, Belošević Čavor J, Škapin SD, Stojadinović S, Rac V, Lević S, Mojović M, Uskoković D. Influence of point defects concentration on optical and photocatalytic properties of ZnO ceramics. in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016. 2016;:34-34.
https://hdl.handle.net/21.15107/rcub_dais_902 .
Marković, Smilja, Rajić, Vladimir B., Veselinović, Ljiljana, Belošević Čavor, Jelena, Škapin, Srečo Davor, Stojadinović, Stevan, Rac, Vladislav, Lević, Steva, Mojović, Miloš, Uskoković, Dragan, "Influence of point defects concentration on optical and photocatalytic properties of ZnO ceramics" in Programme and The Book of Abstracts / Eighteenth Annual Conference YUCOMAT 2016, Herceg Novi, September 5-10, 2016 (2016):34-34,
https://hdl.handle.net/21.15107/rcub_dais_902 .

Novel amino modified GMA-EGDMA-m-PMMA monolith for efficient cationic pollutant removal

Rusmirović, Jelena; Lević, Steva; Pavlović, Vladimir B.; Marinković, Aleksandar

(Belgrade : Serbian Ceramic Society, 2016)

TY  - CONF
AU  - Rusmirović, Jelena
AU  - Lević, Steva
AU  - Pavlović, Vladimir B.
AU  - Marinković, Aleksandar
PY  - 2016
UR  - http://dais.sanu.ac.rs/123456789/876
AB  - Novel macro/micro-porous monolith material containing surface amino functional groups was developed for efficient cationic pollutant removal. The monolith was prepared by copolymerization process of monomers glycidyl methacrylate (GMA), ethylene glycol dimethacrylate (EGDMA) and modified low molar mass poly(methyl methacrylate) (PMMA). In order to improve mechanical stability of GMA-EGDMA monolith, surface of PMMA was modified with ethanol amine in first step, and introduction of methacryloyl chloride in a second step produced m-PMMA. Synthesized GMA-EGDMA-m-PMMA monolith was modified with poly(ethylene imine) (PEI). The effectiveness of copolymerization, as well as introduction of amino groups via PEI modification were confirmed by FTIR and Raman analyses. The morphological appearance of the synthesized monolith, examined by scanning electron microscopy (SEM), clearly indicates porous structure. The results of textural parameters, i.e. monolith porosity, determined by using liquid saturating method, indicate high degree of porosity. Cationic pollutant removal capacity, cadmium and lead, of 32.0 and 42.5 mg g−1 at 25 °C indicates that this monolith is high efficient. This macro/micro-porous monolith could be a promising adsorbent because of its low-cost synthesis process and excellent performance.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : V Serbian Ceramic Society Conference, Sep 21-23 September 2016, Belgrade
T1  - Novel amino modified GMA-EGDMA-m-PMMA monolith for efficient cationic pollutant removal
SP  - 63
EP  - 63
UR  - https://hdl.handle.net/21.15107/rcub_dais_876
ER  - 
@conference{
author = "Rusmirović, Jelena and Lević, Steva and Pavlović, Vladimir B. and Marinković, Aleksandar",
year = "2016",
abstract = "Novel macro/micro-porous monolith material containing surface amino functional groups was developed for efficient cationic pollutant removal. The monolith was prepared by copolymerization process of monomers glycidyl methacrylate (GMA), ethylene glycol dimethacrylate (EGDMA) and modified low molar mass poly(methyl methacrylate) (PMMA). In order to improve mechanical stability of GMA-EGDMA monolith, surface of PMMA was modified with ethanol amine in first step, and introduction of methacryloyl chloride in a second step produced m-PMMA. Synthesized GMA-EGDMA-m-PMMA monolith was modified with poly(ethylene imine) (PEI). The effectiveness of copolymerization, as well as introduction of amino groups via PEI modification were confirmed by FTIR and Raman analyses. The morphological appearance of the synthesized monolith, examined by scanning electron microscopy (SEM), clearly indicates porous structure. The results of textural parameters, i.e. monolith porosity, determined by using liquid saturating method, indicate high degree of porosity. Cationic pollutant removal capacity, cadmium and lead, of 32.0 and 42.5 mg g−1 at 25 °C indicates that this monolith is high efficient. This macro/micro-porous monolith could be a promising adsorbent because of its low-cost synthesis process and excellent performance.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : V Serbian Ceramic Society Conference, Sep 21-23 September 2016, Belgrade",
title = "Novel amino modified GMA-EGDMA-m-PMMA monolith for efficient cationic pollutant removal",
pages = "63-63",
url = "https://hdl.handle.net/21.15107/rcub_dais_876"
}
Rusmirović, J., Lević, S., Pavlović, V. B.,& Marinković, A.. (2016). Novel amino modified GMA-EGDMA-m-PMMA monolith for efficient cationic pollutant removal. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : V Serbian Ceramic Society Conference, Sep 21-23 September 2016, Belgrade
Belgrade : Serbian Ceramic Society., 63-63.
https://hdl.handle.net/21.15107/rcub_dais_876
Rusmirović J, Lević S, Pavlović VB, Marinković A. Novel amino modified GMA-EGDMA-m-PMMA monolith for efficient cationic pollutant removal. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : V Serbian Ceramic Society Conference, Sep 21-23 September 2016, Belgrade. 2016;:63-63.
https://hdl.handle.net/21.15107/rcub_dais_876 .
Rusmirović, Jelena, Lević, Steva, Pavlović, Vladimir B., Marinković, Aleksandar, "Novel amino modified GMA-EGDMA-m-PMMA monolith for efficient cationic pollutant removal" in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : V Serbian Ceramic Society Conference, Sep 21-23 September 2016, Belgrade (2016):63-63,
https://hdl.handle.net/21.15107/rcub_dais_876 .

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 .

Thermal, morphological, and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process

Lević, Steva; Obradović, Nina; Pavlović, Vladimir B.; Isailović, Bojana; Kostić, Ivana; Mitrić, Miodrag; Bugarski, Branko; Nedović, Viktor

(Springer, 2014)

TY  - JOUR
AU  - Lević, Steva
AU  - Obradović, Nina
AU  - Pavlović, Vladimir B.
AU  - Isailović, Bojana
AU  - Kostić, Ivana
AU  - Mitrić, Miodrag
AU  - Bugarski, Branko
AU  - Nedović, Viktor
PY  - 2014
UR  - http://dais.sanu.ac.rs/123456789/654
AB  - In this study, polyvinyl alcohol (PVA) nanofibers with ethyl vanillin as an active compound were prepared using electrospinning technique. The final products of electrospinning process were in the form of nanofibers films. PVA/ethyl vanillin nanofibers, having fibers diameters in the range 100–1700 nm, were successfully electrospun from ethanol/water mixture of PVA and ethyl vanillin. The effects of immobilization process on ethyl vanillin thermal properties were investigated by differential scanning calorimetry (DSC). The results of DSC showed significant influence of immobilization process on thermal properties of ethyl vanillin. It was noticed that melting point of immobilized ethyl vanillin was lower (~55 °C) compared to free flavor (~77 °C). Our results showed that films based on PVA/ethyl vanillin nanofibers are mechanically stable.
PB  - Springer
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Thermal, morphological, and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process
SP  - 661
EP  - 668
VL  - 118
IS  - 2
DO  - 10.1007/s10973-014-4060-4
UR  - https://hdl.handle.net/21.15107/rcub_dais_654
ER  - 
@article{
author = "Lević, Steva and Obradović, Nina and Pavlović, Vladimir B. and Isailović, Bojana and Kostić, Ivana and Mitrić, Miodrag and Bugarski, Branko and Nedović, Viktor",
year = "2014",
abstract = "In this study, polyvinyl alcohol (PVA) nanofibers with ethyl vanillin as an active compound were prepared using electrospinning technique. The final products of electrospinning process were in the form of nanofibers films. PVA/ethyl vanillin nanofibers, having fibers diameters in the range 100–1700 nm, were successfully electrospun from ethanol/water mixture of PVA and ethyl vanillin. The effects of immobilization process on ethyl vanillin thermal properties were investigated by differential scanning calorimetry (DSC). The results of DSC showed significant influence of immobilization process on thermal properties of ethyl vanillin. It was noticed that melting point of immobilized ethyl vanillin was lower (~55 °C) compared to free flavor (~77 °C). Our results showed that films based on PVA/ethyl vanillin nanofibers are mechanically stable.",
publisher = "Springer",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Thermal, morphological, and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process",
pages = "661-668",
volume = "118",
number = "2",
doi = "10.1007/s10973-014-4060-4",
url = "https://hdl.handle.net/21.15107/rcub_dais_654"
}
Lević, S., Obradović, N., Pavlović, V. B., Isailović, B., Kostić, I., Mitrić, M., Bugarski, B.,& Nedović, V.. (2014). Thermal, morphological, and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process. in Journal of Thermal Analysis and Calorimetry
Springer., 118(2), 661-668.
https://doi.org/10.1007/s10973-014-4060-4
https://hdl.handle.net/21.15107/rcub_dais_654
Lević S, Obradović N, Pavlović VB, Isailović B, Kostić I, Mitrić M, Bugarski B, Nedović V. Thermal, morphological, and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process. in Journal of Thermal Analysis and Calorimetry. 2014;118(2):661-668.
doi:10.1007/s10973-014-4060-4
https://hdl.handle.net/21.15107/rcub_dais_654 .
Lević, Steva, Obradović, Nina, Pavlović, Vladimir B., Isailović, Bojana, Kostić, Ivana, Mitrić, Miodrag, Bugarski, Branko, Nedović, Viktor, "Thermal, morphological, and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process" in Journal of Thermal Analysis and Calorimetry, 118, no. 2 (2014):661-668,
https://doi.org/10.1007/s10973-014-4060-4 .,
https://hdl.handle.net/21.15107/rcub_dais_654 .
18
15
15

Thermal, morphological and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process

Lević, Steva; Obradović, Nina; Pavlović, Vladimir B.; Isailović, Bojana; Kostić, Ivana; Bugarski, Branko; Nedović, Viktor

(Vilnus : Central and Eastern European Committee for Thermal Analysis and Calorimetry, 2013)

TY  - CONF
AU  - Lević, Steva
AU  - Obradović, Nina
AU  - Pavlović, Vladimir B.
AU  - Isailović, Bojana
AU  - Kostić, Ivana
AU  - Bugarski, Branko
AU  - Nedović, Viktor
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/759
AB  - In this study, polyvinyl alcohol (PVA) nanofibers with ethyl vanillin as active compound were prepared using electrospinning technique. The final products of electrospinning process were in the form of films consist of nanofibers. PVNethyl vanillin nanofibers, having fibers diameters in the range 100-1700 nm, were successfully electrospun from ethanol/water mixture of PVA and ethyl vanillin. The effects of immobilization process on ethyl vanillin thermal properties were investigated by differential scanning calorimetry (DSC). The results of DSC showed significant influence of immobilization process on thermal properties of ethyl vanillin. It was noticed that melting point of immobilized ethyl vanillin was lower (~55°C) compared to free flavor (~77°C). Our results showed that films based on PVNethyl vanillin nanofibers are mechanically stable.
PB  - Vilnus : Central and Eastern European Committee for Thermal Analysis and Calorimetry
C3  - 2nd Central and Eastern European Conference on Thermal Analysis and Calorimetry 27-30 August 2013, Vilnius, Lithuania: Book of Abstracts
T1  - Thermal, morphological and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process
SP  - 294
EP  - 294
UR  - https://hdl.handle.net/21.15107/rcub_dais_759
ER  - 
@conference{
author = "Lević, Steva and Obradović, Nina and Pavlović, Vladimir B. and Isailović, Bojana and Kostić, Ivana and Bugarski, Branko and Nedović, Viktor",
year = "2013",
abstract = "In this study, polyvinyl alcohol (PVA) nanofibers with ethyl vanillin as active compound were prepared using electrospinning technique. The final products of electrospinning process were in the form of films consist of nanofibers. PVNethyl vanillin nanofibers, having fibers diameters in the range 100-1700 nm, were successfully electrospun from ethanol/water mixture of PVA and ethyl vanillin. The effects of immobilization process on ethyl vanillin thermal properties were investigated by differential scanning calorimetry (DSC). The results of DSC showed significant influence of immobilization process on thermal properties of ethyl vanillin. It was noticed that melting point of immobilized ethyl vanillin was lower (~55°C) compared to free flavor (~77°C). Our results showed that films based on PVNethyl vanillin nanofibers are mechanically stable.",
publisher = "Vilnus : Central and Eastern European Committee for Thermal Analysis and Calorimetry",
journal = "2nd Central and Eastern European Conference on Thermal Analysis and Calorimetry 27-30 August 2013, Vilnius, Lithuania: Book of Abstracts",
title = "Thermal, morphological and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process",
pages = "294-294",
url = "https://hdl.handle.net/21.15107/rcub_dais_759"
}
Lević, S., Obradović, N., Pavlović, V. B., Isailović, B., Kostić, I., Bugarski, B.,& Nedović, V.. (2013). Thermal, morphological and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process. in 2nd Central and Eastern European Conference on Thermal Analysis and Calorimetry 27-30 August 2013, Vilnius, Lithuania: Book of Abstracts
Vilnus : Central and Eastern European Committee for Thermal Analysis and Calorimetry., 294-294.
https://hdl.handle.net/21.15107/rcub_dais_759
Lević S, Obradović N, Pavlović VB, Isailović B, Kostić I, Bugarski B, Nedović V. Thermal, morphological and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process. in 2nd Central and Eastern European Conference on Thermal Analysis and Calorimetry 27-30 August 2013, Vilnius, Lithuania: Book of Abstracts. 2013;:294-294.
https://hdl.handle.net/21.15107/rcub_dais_759 .
Lević, Steva, Obradović, Nina, Pavlović, Vladimir B., Isailović, Bojana, Kostić, Ivana, Bugarski, Branko, Nedović, Viktor, "Thermal, morphological and mechanical properties of ethyl vanillin immobilized in polyvinyl alcohol by electrospinning process" in 2nd Central and Eastern European Conference on Thermal Analysis and Calorimetry 27-30 August 2013, Vilnius, Lithuania: Book of Abstracts (2013):294-294,
https://hdl.handle.net/21.15107/rcub_dais_759 .