TY  - JOUR
AU  - Vujančević, Jelena
AU  - Andričević, Pavao
AU  - Đokić, Veljko
AU  - Blagojević, Vladimir A.
AU  - Pavlović, Vera P.
AU  - Ćirković, Jovana
AU  - Horvath, Endre
AU  - Forro, Laszlo
AU  - Karoui, Abdennaceur
AU  - Pavlović, Vladimir B.
AU  - Janaćković, Đorđe
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6323
AB  - In this study, we report the influence of vanadium oxide (VO), as a photosensitive component, on the photoactivity of TiO2 nanotubes (TNTs). A series of TNTs of varying tube diameter were synthesized by the anodization of titanium foils at different voltages, while vanadium oxide was deposited on TNTs by wet chemical deposition. An improvement in the optical properties of nanotubes was observed after the deposition of vanadium oxide. An improvement in the optical properties (redshift in UV-Vis spectra) of TNTs and TNT/VO was noted. The photocatalytic activity was improved with increasing tube diameter, while it was weakened after the deposition of VO. Furthermore, photoactivity was investigated in photodiodes based on TNTs or TNT/VO and single crystals of CH3NH3PbI3. The photoelectric measurement revealed that different TNT diameters did not influence the I-V characteristic of the photodiodes, while the deposition of VO improved the photocurrent for smaller TNTs.
PB  - MDPI
T2  - Catalysts
T1  - Effect of the Deposition of Vanadium-Oxide on the Photocatalytic Activity of TiO2 Nanotubes and Its Photodiode Performance Interfaced with CH3NH3PbI3 Single Crystal
IS  - 2
SP  - 352
VL  - 13
DO  - 10.3390/catal13020352
ER  - 

@article{
author = "Vujančević, Jelena and Andričević, Pavao and Đokić, Veljko and Blagojević, Vladimir A. and Pavlović, Vera P. and Ćirković, Jovana and Horvath, Endre and Forro, Laszlo and Karoui, Abdennaceur and Pavlović, Vladimir B. and Janaćković, Đorđe",
year = "2023",
abstract = "In this study, we report the influence of vanadium oxide (VO), as a photosensitive component, on the photoactivity of TiO2 nanotubes (TNTs). A series of TNTs of varying tube diameter were synthesized by the anodization of titanium foils at different voltages, while vanadium oxide was deposited on TNTs by wet chemical deposition. An improvement in the optical properties of nanotubes was observed after the deposition of vanadium oxide. An improvement in the optical properties (redshift in UV-Vis spectra) of TNTs and TNT/VO was noted. The photocatalytic activity was improved with increasing tube diameter, while it was weakened after the deposition of VO. Furthermore, photoactivity was investigated in photodiodes based on TNTs or TNT/VO and single crystals of CH3NH3PbI3. The photoelectric measurement revealed that different TNT diameters did not influence the I-V characteristic of the photodiodes, while the deposition of VO improved the photocurrent for smaller TNTs.",
publisher = "MDPI",
journal = "Catalysts",
title = "Effect of the Deposition of Vanadium-Oxide on the Photocatalytic Activity of TiO2 Nanotubes and Its Photodiode Performance Interfaced with CH3NH3PbI3 Single Crystal",
number = "2",
pages = "352",
volume = "13",
doi = "10.3390/catal13020352"
}

Vujančević, J., Andričević, P., Đokić, V., Blagojević, V. A., Pavlović, V. P., Ćirković, J., Horvath, E., Forro, L., Karoui, A., Pavlović, V. B.,& Janaćković, Đ.. (2023). Effect of the Deposition of Vanadium-Oxide on the Photocatalytic Activity of TiO2 Nanotubes and Its Photodiode Performance Interfaced with CH3NH3PbI3 Single Crystal. in Catalysts
MDPI., 13(2), 352.
https://doi.org/10.3390/catal13020352

Vujančević J, Andričević P, Đokić V, Blagojević VA, Pavlović VP, Ćirković J, Horvath E, Forro L, Karoui A, Pavlović VB, Janaćković Đ. Effect of the Deposition of Vanadium-Oxide on the Photocatalytic Activity of TiO2 Nanotubes and Its Photodiode Performance Interfaced with CH3NH3PbI3 Single Crystal. in Catalysts. 2023;13(2):352.
doi:10.3390/catal13020352 .

Vujančević, Jelena, Andričević, Pavao, Đokić, Veljko, Blagojević, Vladimir A., Pavlović, Vera P., Ćirković, Jovana, Horvath, Endre, Forro, Laszlo, Karoui, Abdennaceur, Pavlović, Vladimir B., Janaćković, Đorđe, "Effect of the Deposition of Vanadium-Oxide on the Photocatalytic Activity of TiO2 Nanotubes and Its Photodiode Performance Interfaced with CH3NH3PbI3 Single Crystal" in Catalysts, 13, no. 2 (2023):352,
https://doi.org/10.3390/catal13020352 . .

TY  - CONF
AU  - Vujančević, Jelena
AU  - Blagojević, Vladimir A.
AU  - Andričević, Pavao
AU  - Pavlović, Vera P.
AU  - Horvath, Endre
AU  - Forro, Laszlo
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
AU  - Janaćković, Đorđe
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4226
AB  - The aim of this study was to investigate the influence of the deposition of vanadium oxide epitaxial layer on the photoresponse of TiO2/CH3NH3PbI3 heterojunction. TiO2 nanotube array was synthesized via anodization of titanium foil at three different voltages. After annealing at 450 °C, vanadium oxide was deposited by direct deposition from vanadyl(IV) sulfate solution. Microstructure analysis has been used for the investigation of the influence of different voltages of anodization on tube diameter. Spectroscopy measurements pointed out the red shift in diffusion reflectance spectra after deposition of vanadium oxide. The presence of V5+ oxidation state has been detected on the surface of nanotube arrays by chemical analysis. CH3NH3PbI3 monocrystal was dry pressed on top of the nanotubes in order to make a photodiode. The current-voltage characteristics of the photodiode were recorded and it was observed that the sample with the smallest wall thickness and higher amount of vanadium has the best photocurrent response.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of Abstracts / Serbian Ceramic Society Conference - Advanced Ceramics and Application X, New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
T1  - Characteristic of photodiode based on vanadium oxide-TiO2 nanotubes/CH3NH3PbI3
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4226
ER  - 

@conference{
author = "Vujančević, Jelena and Blagojević, Vladimir A. and Andričević, Pavao and Pavlović, Vera P. and Horvath, Endre and Forro, Laszlo and Vlahović, Branislav and Pavlović, Vladimir B. and Janaćković, Đorđe",
year = "2022",
abstract = "The aim of this study was to investigate the influence of the deposition of vanadium oxide epitaxial layer on the photoresponse of TiO2/CH3NH3PbI3 heterojunction. TiO2 nanotube array was synthesized via anodization of titanium foil at three different voltages. After annealing at 450 °C, vanadium oxide was deposited by direct deposition from vanadyl(IV) sulfate solution. Microstructure analysis has been used for the investigation of the influence of different voltages of anodization on tube diameter. Spectroscopy measurements pointed out the red shift in diffusion reflectance spectra after deposition of vanadium oxide. The presence of V5+ oxidation state has been detected on the surface of nanotube arrays by chemical analysis. CH3NH3PbI3 monocrystal was dry pressed on top of the nanotubes in order to make a photodiode. The current-voltage characteristics of the photodiode were recorded and it was observed that the sample with the smallest wall thickness and higher amount of vanadium has the best photocurrent response.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of Abstracts / Serbian Ceramic Society Conference - Advanced Ceramics and Application X, New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.",
title = "Characteristic of photodiode based on vanadium oxide-TiO2 nanotubes/CH3NH3PbI3",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4226"
}

Vujančević, J., Blagojević, V. A., Andričević, P., Pavlović, V. P., Horvath, E., Forro, L., Vlahović, B., Pavlović, V. B.,& Janaćković, Đ.. (2022). Characteristic of photodiode based on vanadium oxide-TiO2 nanotubes/CH3NH3PbI3. in Program and the Book of Abstracts / Serbian Ceramic Society Conference - Advanced Ceramics and Application X, New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.
Belgrade : Serbian Ceramic Society..
https://hdl.handle.net/21.15107/rcub_machinery_4226

Vujančević J, Blagojević VA, Andričević P, Pavlović VP, Horvath E, Forro L, Vlahović B, Pavlović VB, Janaćković Đ. Characteristic of photodiode based on vanadium oxide-TiO2 nanotubes/CH3NH3PbI3. in Program and the Book of Abstracts / Serbian Ceramic Society Conference - Advanced Ceramics and Application X, New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022.. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_4226 .

Vujančević, Jelena, Blagojević, Vladimir A., Andričević, Pavao, Pavlović, Vera P., Horvath, Endre, Forro, Laszlo, Vlahović, Branislav, Pavlović, Vladimir B., Janaćković, Đorđe, "Characteristic of photodiode based on vanadium oxide-TiO2 nanotubes/CH3NH3PbI3" in Program and the Book of Abstracts / Serbian Ceramic Society Conference - Advanced Ceramics and Application X, New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 26-27. September 2022. (2022),
https://hdl.handle.net/21.15107/rcub_machinery_4226 .

TY  - CONF
AU  - Vujančević, Jelena
AU  - Blagojević, Vladimir A.
AU  - Andričević, Pavao
AU  - Pavlović, Vera P.
AU  - Horvath, Endre
AU  - Forro, Laszlo
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
AU  - Janaćković, Đorđe
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4223
AB  - The aim of this study was to investigate the influence of vanadium oxide photosensitive surface layer on the photoactivity of TiO2 nanotubes. Nanotube arrays were synthesized by anodization of titanium foil at different voltages, and vanadium-oxide was deposited by wet chemical deposition. Deposition of the vanadium-oxide layer was confirmed by XPS analysis, which provided the chemical composition of the sample surface. Photovoltaic characteristics and photocatalytic performance for photodegradation of methyl orange dye of modified TiO2 nanotubes were correlated with the nanotube morphology (and anodization voltage). Optimal anodization voltage was determined, in conjunction with the deposition of the surface vanadium oxide layer, in order to achieve maximum performance of the modified TiO2 electrodes. This has been correlated with changes in the optical properties of the TiO2 electrodes, the nanotube length and diameter, as they occur with the change in the anodization voltage, as well as the changes in the vanadium-oxide content in the samples, where the vanadium-oxide content was found to be determined by the nanotube morphology. The photovoltaic performance of the optimized modified TiO2 electrode with the surface vanadium-oxide layer was found to be significantly better than both the performance of the corresponding TiO2 electrode, and the performance of all the other TiO2 electrodes included in the study.
PB  - Faculty of Technology, University of Novi Sad
C3  - Programme and Book of Abstracts of the ECerS 14th Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, Serbia
T1  - Photoactivity of vanadium oxide TiO2 nanotubes
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4223
ER  - 

@conference{
author = "Vujančević, Jelena and Blagojević, Vladimir A. and Andričević, Pavao and Pavlović, Vera P. and Horvath, Endre and Forro, Laszlo and Vlahović, Branislav and Pavlović, Vladimir B. and Janaćković, Đorđe",
year = "2021",
abstract = "The aim of this study was to investigate the influence of vanadium oxide photosensitive surface layer on the photoactivity of TiO2 nanotubes. Nanotube arrays were synthesized by anodization of titanium foil at different voltages, and vanadium-oxide was deposited by wet chemical deposition. Deposition of the vanadium-oxide layer was confirmed by XPS analysis, which provided the chemical composition of the sample surface. Photovoltaic characteristics and photocatalytic performance for photodegradation of methyl orange dye of modified TiO2 nanotubes were correlated with the nanotube morphology (and anodization voltage). Optimal anodization voltage was determined, in conjunction with the deposition of the surface vanadium oxide layer, in order to achieve maximum performance of the modified TiO2 electrodes. This has been correlated with changes in the optical properties of the TiO2 electrodes, the nanotube length and diameter, as they occur with the change in the anodization voltage, as well as the changes in the vanadium-oxide content in the samples, where the vanadium-oxide content was found to be determined by the nanotube morphology. The photovoltaic performance of the optimized modified TiO2 electrode with the surface vanadium-oxide layer was found to be significantly better than both the performance of the corresponding TiO2 electrode, and the performance of all the other TiO2 electrodes included in the study.",
publisher = "Faculty of Technology, University of Novi Sad",
journal = "Programme and Book of Abstracts of the ECerS 14th Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, Serbia",
title = "Photoactivity of vanadium oxide TiO2 nanotubes",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4223"
}

Vujančević, J., Blagojević, V. A., Andričević, P., Pavlović, V. P., Horvath, E., Forro, L., Vlahović, B., Pavlović, V. B.,& Janaćković, Đ.. (2021). Photoactivity of vanadium oxide TiO2 nanotubes. in Programme and Book of Abstracts of the ECerS 14th Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, Serbia
Faculty of Technology, University of Novi Sad..
https://hdl.handle.net/21.15107/rcub_machinery_4223

Vujančević J, Blagojević VA, Andričević P, Pavlović VP, Horvath E, Forro L, Vlahović B, Pavlović VB, Janaćković Đ. Photoactivity of vanadium oxide TiO2 nanotubes. in Programme and Book of Abstracts of the ECerS 14th Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, Serbia. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_4223 .

Vujančević, Jelena, Blagojević, Vladimir A., Andričević, Pavao, Pavlović, Vera P., Horvath, Endre, Forro, Laszlo, Vlahović, Branislav, Pavlović, Vladimir B., Janaćković, Đorđe, "Photoactivity of vanadium oxide TiO2 nanotubes" in Programme and Book of Abstracts of the ECerS 14th Conference for Young Scientists in Ceramics (CYSC-2021), October 20-23, 2021, Novi Sad, Serbia (2021),
https://hdl.handle.net/21.15107/rcub_machinery_4223 .

TY  - JOUR
AU  - Vujančević, Jelena
AU  - Andričević, Pavao
AU  - Bjelajac, Andjelika
AU  - Đokić, Veljko
AU  - Popović, Maja
AU  - Rakocević, Zlatko
AU  - Horvath, Endre
AU  - Kollar, Marton
AU  - Nafradi, Balint
AU  - Schiller, Andreas
AU  - Domanski, Konrad
AU  - Forro, Laszlo
AU  - Pavlović, Vera P.
AU  - Janaćković, Đorđe
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4043
AB  - Highly ordered, anodically grown TiO2 nanotubes on titanium supports were annealed in ammonia atmosphere in order to incorporate nitrogen doping (≤2 at.%) in the titanium oxide lattice. FESEM micrographs revealed nanotubes with an average outer diameter of 101.5 ± 1.5 nm and an average wall thickness of about 13 nm. Anatase crystals were formed inside the tubes after annealing in ammonia atmosphere for 30 min. With further annealing, rutile peaks appeared due to the thermal oxidation of the foil and rise as the duration of heat treatment was increased. The concentration and chemical nature of nitrogen in the nanotube arrays can be correlated to the optical response of dry-pressed heterojunctions of doped TiO2/CH3 NH3PbI3 single crystals. The N-TiO2/perovskite heterojunction with the highest amount of interstitial nitrogen exhibited an improved photocurrent, indicating the importance of the semiconductor doping-based heterojunction optimization strategies to deliver competitive levels of halide perovskite-based optoelectronic devices to be envisioned for urban infrastructures.
PB  - Elsevier
T2  - Ceramics International
T1  - Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping
EP  - 10020
IS  - 8
SP  - 10013
VL  - 45
DO  - 10.1016/j.ceramint.2019.02.045
ER  - 

@article{
author = "Vujančević, Jelena and Andričević, Pavao and Bjelajac, Andjelika and Đokić, Veljko and Popović, Maja and Rakocević, Zlatko and Horvath, Endre and Kollar, Marton and Nafradi, Balint and Schiller, Andreas and Domanski, Konrad and Forro, Laszlo and Pavlović, Vera P. and Janaćković, Đorđe",
year = "2019",
abstract = "Highly ordered, anodically grown TiO2 nanotubes on titanium supports were annealed in ammonia atmosphere in order to incorporate nitrogen doping (≤2 at.%) in the titanium oxide lattice. FESEM micrographs revealed nanotubes with an average outer diameter of 101.5 ± 1.5 nm and an average wall thickness of about 13 nm. Anatase crystals were formed inside the tubes after annealing in ammonia atmosphere for 30 min. With further annealing, rutile peaks appeared due to the thermal oxidation of the foil and rise as the duration of heat treatment was increased. The concentration and chemical nature of nitrogen in the nanotube arrays can be correlated to the optical response of dry-pressed heterojunctions of doped TiO2/CH3 NH3PbI3 single crystals. The N-TiO2/perovskite heterojunction with the highest amount of interstitial nitrogen exhibited an improved photocurrent, indicating the importance of the semiconductor doping-based heterojunction optimization strategies to deliver competitive levels of halide perovskite-based optoelectronic devices to be envisioned for urban infrastructures.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping",
pages = "10020-10013",
number = "8",
volume = "45",
doi = "10.1016/j.ceramint.2019.02.045"
}

Vujančević, J., Andričević, P., Bjelajac, A., Đokić, V., Popović, M., Rakocević, Z., Horvath, E., Kollar, M., Nafradi, B., Schiller, A., Domanski, K., Forro, L., Pavlović, V. P.,& Janaćković, Đ.. (2019). Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping. in Ceramics International
Elsevier., 45(8), 10013-10020.
https://doi.org/10.1016/j.ceramint.2019.02.045

Vujančević J, Andričević P, Bjelajac A, Đokić V, Popović M, Rakocević Z, Horvath E, Kollar M, Nafradi B, Schiller A, Domanski K, Forro L, Pavlović VP, Janaćković Đ. Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping. in Ceramics International. 2019;45(8):10013-10020.
doi:10.1016/j.ceramint.2019.02.045 .

Vujančević, Jelena, Andričević, Pavao, Bjelajac, Andjelika, Đokić, Veljko, Popović, Maja, Rakocević, Zlatko, Horvath, Endre, Kollar, Marton, Nafradi, Balint, Schiller, Andreas, Domanski, Konrad, Forro, Laszlo, Pavlović, Vera P., Janaćković, Đorđe, "Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping" in Ceramics International, 45, no. 8 (2019):10013-10020,
https://doi.org/10.1016/j.ceramint.2019.02.045 . .

TY  - JOUR
AU  - Vujančević, Jelena
AU  - Andričević, Pavao
AU  - Bjelajac, Andjelika
AU  - Đokić, Veljko
AU  - Popović, Maja
AU  - Rakočević, Zlatko
AU  - Horvath, Endre
AU  - Kollar, Marton
AU  - Nafradi, Balint
AU  - Schiller, Andreas
AU  - Domanski, Konrad
AU  - Forro, Laszlo
AU  - Pavlović, Vera P.
AU  - Janaćković, Đorđe
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3103
AB  - Highly ordered, anodically grown TiO2 nanotubes on titanium supports were annealed in ammonia atmosphere in order to incorporate nitrogen doping (≤2 at.%) in the titanium oxide lattice. FESEM micrographs revealed nanotubes with an average outer diameter of 101.5 ± 1.5 nm and an average wall thickness of about 13 nm. Anatase crystals were formed inside the tubes after annealing in ammonia atmosphere for 30 min. With further annealing, rutile peaks appeared due to the thermal oxidation of the foil and rise as the duration of heat treatment was increased. The concentration and chemical nature of nitrogen in the nanotube arrays can be correlated to the optical response of dry-pressed heterojunctions of doped TiO2/CH3 NH3PbI3 single crystals. The N-TiO2/perovskite heterojunction with the highest amount of interstitial nitrogen exhibited an improved photocurrent, indicating the importance of the semiconductor doping-based heterojunction optimization strategies to deliver competitive levels of halide perovskite-based optoelectronic devices to be envisioned for urban infrastructures.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping
EP  - 10020
IS  - 8
SP  - 10013
VL  - 45
DO  - 10.1016/j.ceramint.2019.02.045
ER  - 

@article{
author = "Vujančević, Jelena and Andričević, Pavao and Bjelajac, Andjelika and Đokić, Veljko and Popović, Maja and Rakočević, Zlatko and Horvath, Endre and Kollar, Marton and Nafradi, Balint and Schiller, Andreas and Domanski, Konrad and Forro, Laszlo and Pavlović, Vera P. and Janaćković, Đorđe",
year = "2019",
abstract = "Highly ordered, anodically grown TiO2 nanotubes on titanium supports were annealed in ammonia atmosphere in order to incorporate nitrogen doping (≤2 at.%) in the titanium oxide lattice. FESEM micrographs revealed nanotubes with an average outer diameter of 101.5 ± 1.5 nm and an average wall thickness of about 13 nm. Anatase crystals were formed inside the tubes after annealing in ammonia atmosphere for 30 min. With further annealing, rutile peaks appeared due to the thermal oxidation of the foil and rise as the duration of heat treatment was increased. The concentration and chemical nature of nitrogen in the nanotube arrays can be correlated to the optical response of dry-pressed heterojunctions of doped TiO2/CH3 NH3PbI3 single crystals. The N-TiO2/perovskite heterojunction with the highest amount of interstitial nitrogen exhibited an improved photocurrent, indicating the importance of the semiconductor doping-based heterojunction optimization strategies to deliver competitive levels of halide perovskite-based optoelectronic devices to be envisioned for urban infrastructures.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping",
pages = "10020-10013",
number = "8",
volume = "45",
doi = "10.1016/j.ceramint.2019.02.045"
}

Vujančević, J., Andričević, P., Bjelajac, A., Đokić, V., Popović, M., Rakočević, Z., Horvath, E., Kollar, M., Nafradi, B., Schiller, A., Domanski, K., Forro, L., Pavlović, V. P.,& Janaćković, Đ.. (2019). Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping. in Ceramics International
Elsevier Sci Ltd, Oxford., 45(8), 10013-10020.
https://doi.org/10.1016/j.ceramint.2019.02.045

Vujančević J, Andričević P, Bjelajac A, Đokić V, Popović M, Rakočević Z, Horvath E, Kollar M, Nafradi B, Schiller A, Domanski K, Forro L, Pavlović VP, Janaćković Đ. Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping. in Ceramics International. 2019;45(8):10013-10020.
doi:10.1016/j.ceramint.2019.02.045 .

Vujančević, Jelena, Andričević, Pavao, Bjelajac, Andjelika, Đokić, Veljko, Popović, Maja, Rakočević, Zlatko, Horvath, Endre, Kollar, Marton, Nafradi, Balint, Schiller, Andreas, Domanski, Konrad, Forro, Laszlo, Pavlović, Vera P., Janaćković, Đorđe, "Dry-pressed anodized titania nanotube/CH3NH3PbI3 single crystal heterojunctions: The beneficial role of N doping" in Ceramics International, 45, no. 8 (2019):10013-10020,
https://doi.org/10.1016/j.ceramint.2019.02.045 . .

TY  - CONF
AU  - Vujančević, Jelena
AU  - Bjelajac, Andjelika
AU  - Ćirković, Jovana
AU  - Pavlović, Vera P.
AU  - Horvath, Endre
AU  - Forro, Laszlo
AU  - Janaćković, Đorđe
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6795
AB  - Semiconductor TiO2 photocatalysis is a heterogeneous catalysis, where the photons of the sun or artificial light source are activating the catalyst that enters in reactions. The targeted real-world applications are in environmental protection and remediation such as wastewater treatment, air purification and decomposition of harmful organic pollutants. In this talk, I present the synthesis of nanotubular, thin TiO2 coatings with altered morphology and crystallinity made by anodization technique. The influence of the anodization parameters and post-synthesis annealing conditions on the photocatalytic methyl orange dye decomposition was assessed. Different morphology, crystallinity and introducing a dopant into lattice increase electron transport and electron lifetime which further improve photocatalytic activity.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Seventeenth Young Researchers' Conference - Materials Sciences and Engineering, December 5-7, 2018, Institute of Technical Sciences of SASA, Belgrade, Serbia, Program and the Book of Abstracts
T1  - Customizing nanotubular titania for photocatalytic activity
EP  - 77
SP  - 77
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6795
ER  - 

@conference{
author = "Vujančević, Jelena and Bjelajac, Andjelika and Ćirković, Jovana and Pavlović, Vera P. and Horvath, Endre and Forro, Laszlo and Janaćković, Đorđe and Pavlović, Vladimir B.",
year = "2018",
abstract = "Semiconductor TiO2 photocatalysis is a heterogeneous catalysis, where the photons of the sun or artificial light source are activating the catalyst that enters in reactions. The targeted real-world applications are in environmental protection and remediation such as wastewater treatment, air purification and decomposition of harmful organic pollutants. In this talk, I present the synthesis of nanotubular, thin TiO2 coatings with altered morphology and crystallinity made by anodization technique. The influence of the anodization parameters and post-synthesis annealing conditions on the photocatalytic methyl orange dye decomposition was assessed. Different morphology, crystallinity and introducing a dopant into lattice increase electron transport and electron lifetime which further improve photocatalytic activity.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Seventeenth Young Researchers' Conference - Materials Sciences and Engineering, December 5-7, 2018, Institute of Technical Sciences of SASA, Belgrade, Serbia, Program and the Book of Abstracts",
title = "Customizing nanotubular titania for photocatalytic activity",
pages = "77-77",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6795"
}

Vujančević, J., Bjelajac, A., Ćirković, J., Pavlović, V. P., Horvath, E., Forro, L., Janaćković, Đ.,& Pavlović, V. B.. (2018). Customizing nanotubular titania for photocatalytic activity. in Seventeenth Young Researchers' Conference - Materials Sciences and Engineering, December 5-7, 2018, Institute of Technical Sciences of SASA, Belgrade, Serbia, Program and the Book of Abstracts
Belgrade : Institute of Technical Sciences of SASA., 77-77.
https://hdl.handle.net/21.15107/rcub_machinery_6795

Vujančević J, Bjelajac A, Ćirković J, Pavlović VP, Horvath E, Forro L, Janaćković Đ, Pavlović VB. Customizing nanotubular titania for photocatalytic activity. in Seventeenth Young Researchers' Conference - Materials Sciences and Engineering, December 5-7, 2018, Institute of Technical Sciences of SASA, Belgrade, Serbia, Program and the Book of Abstracts. 2018;:77-77.
https://hdl.handle.net/21.15107/rcub_machinery_6795 .

Vujančević, Jelena, Bjelajac, Andjelika, Ćirković, Jovana, Pavlović, Vera P., Horvath, Endre, Forro, Laszlo, Janaćković, Đorđe, Pavlović, Vladimir B., "Customizing nanotubular titania for photocatalytic activity" in Seventeenth Young Researchers' Conference - Materials Sciences and Engineering, December 5-7, 2018, Institute of Technical Sciences of SASA, Belgrade, Serbia, Program and the Book of Abstracts (2018):77-77,
https://hdl.handle.net/21.15107/rcub_machinery_6795 .

TY  - JOUR
AU  - Vujančević, Jelena
AU  - Bjelajac, Andjelika
AU  - Ćirković, Jovana
AU  - Pavlović, Vera P.
AU  - Horvath, Endre
AU  - Forro, Laszlo
AU  - Vlahović, Branislav
AU  - Mitrić, Miodrag
AU  - Janaćković, Đorđe
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2834
AB  - One-dimensional (1D) TiO2 nanotubes perpendicular to the substrate were obtained by electrochemical oxidation of titanium foil in an acid electrolyte. In order to alter the crystallinity and the morphology of films the as-anodized amorphous TiO2 nanotube films were sintered at elevated temperatures. The evolution of the morphology was visualized via scanning electron microscopy (SEM), while the crystalline structure was investigated by Xray diffraction (XRD) and Raman spectroscopy. The chemical composition was studied by Xray photoelectron spectroscopy (XPS). The effects of crystallinity and morphology of TiO2 nanotube (NTs) films on photocatalytic degradation of methyl orange (MO) in an aqueous solution under UV light irradiation were also investigated. The TiO2 nanotubes sintered at 650 degrees C for 30 min had the highest degree of crystallinity and exhibited the best photocatalytic activity among the studied TiO2 nanotube films.
PB  - ETRAN, Beograd
T2  - Science of Sintering
T1  - Structure and photocatalytic properties of sintered TiO2 nanotube arrays
EP  - 50
IS  - 1
SP  - 39
VL  - 50
DO  - 10.2298/SOS1801039V
ER  - 

@article{
author = "Vujančević, Jelena and Bjelajac, Andjelika and Ćirković, Jovana and Pavlović, Vera P. and Horvath, Endre and Forro, Laszlo and Vlahović, Branislav and Mitrić, Miodrag and Janaćković, Đorđe and Pavlović, Vladimir B.",
year = "2018",
abstract = "One-dimensional (1D) TiO2 nanotubes perpendicular to the substrate were obtained by electrochemical oxidation of titanium foil in an acid electrolyte. In order to alter the crystallinity and the morphology of films the as-anodized amorphous TiO2 nanotube films were sintered at elevated temperatures. The evolution of the morphology was visualized via scanning electron microscopy (SEM), while the crystalline structure was investigated by Xray diffraction (XRD) and Raman spectroscopy. The chemical composition was studied by Xray photoelectron spectroscopy (XPS). The effects of crystallinity and morphology of TiO2 nanotube (NTs) films on photocatalytic degradation of methyl orange (MO) in an aqueous solution under UV light irradiation were also investigated. The TiO2 nanotubes sintered at 650 degrees C for 30 min had the highest degree of crystallinity and exhibited the best photocatalytic activity among the studied TiO2 nanotube films.",
publisher = "ETRAN, Beograd",
journal = "Science of Sintering",
title = "Structure and photocatalytic properties of sintered TiO2 nanotube arrays",
pages = "50-39",
number = "1",
volume = "50",
doi = "10.2298/SOS1801039V"
}

Vujančević, J., Bjelajac, A., Ćirković, J., Pavlović, V. P., Horvath, E., Forro, L., Vlahović, B., Mitrić, M., Janaćković, Đ.,& Pavlović, V. B.. (2018). Structure and photocatalytic properties of sintered TiO2 nanotube arrays. in Science of Sintering
ETRAN, Beograd., 50(1), 39-50.
https://doi.org/10.2298/SOS1801039V

Vujančević J, Bjelajac A, Ćirković J, Pavlović VP, Horvath E, Forro L, Vlahović B, Mitrić M, Janaćković Đ, Pavlović VB. Structure and photocatalytic properties of sintered TiO2 nanotube arrays. in Science of Sintering. 2018;50(1):39-50.
doi:10.2298/SOS1801039V .

Vujančević, Jelena, Bjelajac, Andjelika, Ćirković, Jovana, Pavlović, Vera P., Horvath, Endre, Forro, Laszlo, Vlahović, Branislav, Mitrić, Miodrag, Janaćković, Đorđe, Pavlović, Vladimir B., "Structure and photocatalytic properties of sintered TiO2 nanotube arrays" in Science of Sintering, 50, no. 1 (2018):39-50,
https://doi.org/10.2298/SOS1801039V . .

TY  - CONF
AU  - Vujančević, Jelena
AU  - Đokić, Veljko
AU  - Bjelajac, Andjelika
AU  - Pavlović, Vera P.
AU  - Mitrić, Miodrag
AU  - Janaćković, Đorđe
AU  - Pavlović, Vladimir B.
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6794
AB  - Having in mind that anodic oxidation method can be used for tailoring desired structure and morphology of TiO2, herein the synthesis of self-ordered TiO2 nanotubes via electrochemical anodization of high purity Ti foil is reported. The influence of synthesis parameters such as oxidative voltage, different electrolyte, annealing temperature and annealing atmosphere were explored and correlate with obtained TiO2 nanotube arrays. The results show that applied potential is the main factor that controls the diameter of the nanotubes, while annealing temperature influence on crystal type and morphology is related to different contents of electrolyte. Investigated method gives opportunity to enhanced performance of TiO2 nanotubes, providing many applications in different field.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Fourteenth Young Researchers' Conference -  Materials Sciences and Engineering, December 9-11 2015, Belgrade, Serbia, Program and the Book of Abstracts
T1  - Tailoring self-ordering TiO2 nanotube arrays by oxidative anodization
EP  - 18
SP  - 18
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6794
ER  - 

@conference{
author = "Vujančević, Jelena and Đokić, Veljko and Bjelajac, Andjelika and Pavlović, Vera P. and Mitrić, Miodrag and Janaćković, Đorđe and Pavlović, Vladimir B.",
year = "2015",
abstract = "Having in mind that anodic oxidation method can be used for tailoring desired structure and morphology of TiO2, herein the synthesis of self-ordered TiO2 nanotubes via electrochemical anodization of high purity Ti foil is reported. The influence of synthesis parameters such as oxidative voltage, different electrolyte, annealing temperature and annealing atmosphere were explored and correlate with obtained TiO2 nanotube arrays. The results show that applied potential is the main factor that controls the diameter of the nanotubes, while annealing temperature influence on crystal type and morphology is related to different contents of electrolyte. Investigated method gives opportunity to enhanced performance of TiO2 nanotubes, providing many applications in different field.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Fourteenth Young Researchers' Conference -  Materials Sciences and Engineering, December 9-11 2015, Belgrade, Serbia, Program and the Book of Abstracts",
title = "Tailoring self-ordering TiO2 nanotube arrays by oxidative anodization",
pages = "18-18",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6794"
}

Vujančević, J., Đokić, V., Bjelajac, A., Pavlović, V. P., Mitrić, M., Janaćković, Đ.,& Pavlović, V. B.. (2015). Tailoring self-ordering TiO2 nanotube arrays by oxidative anodization. in Fourteenth Young Researchers' Conference -  Materials Sciences and Engineering, December 9-11 2015, Belgrade, Serbia, Program and the Book of Abstracts
Belgrade : Institute of Technical Sciences of SASA., 18-18.
https://hdl.handle.net/21.15107/rcub_machinery_6794

Vujančević J, Đokić V, Bjelajac A, Pavlović VP, Mitrić M, Janaćković Đ, Pavlović VB. Tailoring self-ordering TiO2 nanotube arrays by oxidative anodization. in Fourteenth Young Researchers' Conference -  Materials Sciences and Engineering, December 9-11 2015, Belgrade, Serbia, Program and the Book of Abstracts. 2015;:18-18.
https://hdl.handle.net/21.15107/rcub_machinery_6794 .

Vujančević, Jelena, Đokić, Veljko, Bjelajac, Andjelika, Pavlović, Vera P., Mitrić, Miodrag, Janaćković, Đorđe, Pavlović, Vladimir B., "Tailoring self-ordering TiO2 nanotube arrays by oxidative anodization" in Fourteenth Young Researchers' Conference -  Materials Sciences and Engineering, December 9-11 2015, Belgrade, Serbia, Program and the Book of Abstracts (2015):18-18,
https://hdl.handle.net/21.15107/rcub_machinery_6794 .

TY  - CONF
AU  - Vujančević, Jelena
AU  - Bjelajac, Andjelika
AU  - Obradović, Nina
AU  - Pavlović, Vera P.
AU  - Mitrić, Miodrag
AU  - Janaćković, Đorđe
AU  - Rašić, Goran
AU  - Vlahović, Branislav
AU  - Pavlović, Vladimir B.
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6793
AB  - The influence of electrochemical conditions and the heat treatment on the crystal structure and the microstructure evolution of TiO2 based nanotubes synthesized by the self-ordering anodization process is investigated in this work. The electrochemical anodization was performed at room temperature, for 30 minutes under 15, 20 and 25 V, with stirring. The as-anodized Ti foils were annealed in air at 450, 600, 650 and 700 °C for 30 minutes. The structure and the lattice dynamics of the samples has been studied by using XRD and Raman spectroscopy methods. The microstructure development of the 1-D TiO2 nanostructures has been analyzed by FESEM.
PB  - Beograd : Serbian Ceramic Society
C3  - Advanced Ceramics and Application IV: New Frontiers in Multifunctional Material Science and Processing, 21-23 September 2015, Belgrade, Serbia, Program and the Book of Abstracts
T1  - Influence of Synthesis Parameters on Structure of 1-D TiO2 nanostructures
EP  - 81
SP  - 81
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6793
ER  - 

@conference{
author = "Vujančević, Jelena and Bjelajac, Andjelika and Obradović, Nina and Pavlović, Vera P. and Mitrić, Miodrag and Janaćković, Đorđe and Rašić, Goran and Vlahović, Branislav and Pavlović, Vladimir B.",
year = "2015",
abstract = "The influence of electrochemical conditions and the heat treatment on the crystal structure and the microstructure evolution of TiO2 based nanotubes synthesized by the self-ordering anodization process is investigated in this work. The electrochemical anodization was performed at room temperature, for 30 minutes under 15, 20 and 25 V, with stirring. The as-anodized Ti foils were annealed in air at 450, 600, 650 and 700 °C for 30 minutes. The structure and the lattice dynamics of the samples has been studied by using XRD and Raman spectroscopy methods. The microstructure development of the 1-D TiO2 nanostructures has been analyzed by FESEM.",
publisher = "Beograd : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application IV: New Frontiers in Multifunctional Material Science and Processing, 21-23 September 2015, Belgrade, Serbia, Program and the Book of Abstracts",
title = "Influence of Synthesis Parameters on Structure of 1-D TiO2 nanostructures",
pages = "81-81",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6793"
}

Vujančević, J., Bjelajac, A., Obradović, N., Pavlović, V. P., Mitrić, M., Janaćković, Đ., Rašić, G., Vlahović, B.,& Pavlović, V. B.. (2015). Influence of Synthesis Parameters on Structure of 1-D TiO2 nanostructures. in Advanced Ceramics and Application IV: New Frontiers in Multifunctional Material Science and Processing, 21-23 September 2015, Belgrade, Serbia, Program and the Book of Abstracts
Beograd : Serbian Ceramic Society., 81-81.
https://hdl.handle.net/21.15107/rcub_machinery_6793

Vujančević J, Bjelajac A, Obradović N, Pavlović VP, Mitrić M, Janaćković Đ, Rašić G, Vlahović B, Pavlović VB. Influence of Synthesis Parameters on Structure of 1-D TiO2 nanostructures. in Advanced Ceramics and Application IV: New Frontiers in Multifunctional Material Science and Processing, 21-23 September 2015, Belgrade, Serbia, Program and the Book of Abstracts. 2015;:81-81.
https://hdl.handle.net/21.15107/rcub_machinery_6793 .

Vujančević, Jelena, Bjelajac, Andjelika, Obradović, Nina, Pavlović, Vera P., Mitrić, Miodrag, Janaćković, Đorđe, Rašić, Goran, Vlahović, Branislav, Pavlović, Vladimir B., "Influence of Synthesis Parameters on Structure of 1-D TiO2 nanostructures" in Advanced Ceramics and Application IV: New Frontiers in Multifunctional Material Science and Processing, 21-23 September 2015, Belgrade, Serbia, Program and the Book of Abstracts (2015):81-81,
https://hdl.handle.net/21.15107/rcub_machinery_6793 .

TY  - JOUR
AU  - Lezaja, Maja
AU  - Veljović, Đorđe
AU  - Manojlović, Dragica
AU  - Milošević, Miloš
AU  - Mitrović, Nenad
AU  - Janaćković, Đorđe
AU  - Miletić, Vesna
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2215
AB  - Objective. To determine the shear bond strength (SBS) between synthetic controlled porous hydroxyapatite (HAP) inserts and restorative materials and dimensional changes of insert-containing restorations during curing. Methods. Cylinder-shaped HAP inserts (4 mm in diameter, 1.6 mm thick) were cemented in dentin discs (5 mm x 1.6 mm), cut mid-coronally from human third molars, using one of the following materials: universal microhybrid composite Filtek Z250, flowable composite Filtek Ultimate or glass-ionomer Vitrebond (all 3M ESPE). SBS of the same materials to HAP inserts was tested in a universal testing machine. Three-dimensional digital image correlation system Aramis (GOM) was used to measure strains and displacements. Data were statistically analyzed using one-way ANOVA with Tukey's post-test (alpha = 0.05). Results. SBS of restorative materials to HAP inserts ranged between 12.2 +/- 2.1 MPa (Filtek Z250) and 0.7 +/- 0.4 MPa (Filtek Z250 without an adhesive). The 'total-etch' approach of adhesive application significantly increased SBS of both Filtek Z250 (12.2 +/- 2.1 MPa) and Filtek Ultimate flowable (9.5 +/- 2.5 MPa) compared to the 'self-etch' approach (8.2 +/- 1.6 MPa and 4.4 +/- 0.9 MPa, respectively) (p  lt  0.05). HAP inserts reduced polymerization shrinkage to below 0.5% as well as displacements in the central region of the restorations. Peripheral shrinkage of restorative materials was similar with and without HAP inserts as were displacements of Filtek Z250 and Vitrebond. Significance. Replacing major part of dentin clinically, especially in large cavities, HAP inserts may shorten clinical working time, improve dimensional stability of the restoration by reducing central shrinkage and displacements and provide adhesive bonding to universal composites following a 'total-etch' approach.
PB  - Elsevier Sci Ltd, Oxford
T2  - Dental Materials
T1  - Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization
EP  - 181
IS  - 2
SP  - 171
VL  - 31
DO  - 10.1016/j.dental.2014.11.017
ER  - 

@article{
author = "Lezaja, Maja and Veljović, Đorđe and Manojlović, Dragica and Milošević, Miloš and Mitrović, Nenad and Janaćković, Đorđe and Miletić, Vesna",
year = "2015",
abstract = "Objective. To determine the shear bond strength (SBS) between synthetic controlled porous hydroxyapatite (HAP) inserts and restorative materials and dimensional changes of insert-containing restorations during curing. Methods. Cylinder-shaped HAP inserts (4 mm in diameter, 1.6 mm thick) were cemented in dentin discs (5 mm x 1.6 mm), cut mid-coronally from human third molars, using one of the following materials: universal microhybrid composite Filtek Z250, flowable composite Filtek Ultimate or glass-ionomer Vitrebond (all 3M ESPE). SBS of the same materials to HAP inserts was tested in a universal testing machine. Three-dimensional digital image correlation system Aramis (GOM) was used to measure strains and displacements. Data were statistically analyzed using one-way ANOVA with Tukey's post-test (alpha = 0.05). Results. SBS of restorative materials to HAP inserts ranged between 12.2 +/- 2.1 MPa (Filtek Z250) and 0.7 +/- 0.4 MPa (Filtek Z250 without an adhesive). The 'total-etch' approach of adhesive application significantly increased SBS of both Filtek Z250 (12.2 +/- 2.1 MPa) and Filtek Ultimate flowable (9.5 +/- 2.5 MPa) compared to the 'self-etch' approach (8.2 +/- 1.6 MPa and 4.4 +/- 0.9 MPa, respectively) (p  lt  0.05). HAP inserts reduced polymerization shrinkage to below 0.5% as well as displacements in the central region of the restorations. Peripheral shrinkage of restorative materials was similar with and without HAP inserts as were displacements of Filtek Z250 and Vitrebond. Significance. Replacing major part of dentin clinically, especially in large cavities, HAP inserts may shorten clinical working time, improve dimensional stability of the restoration by reducing central shrinkage and displacements and provide adhesive bonding to universal composites following a 'total-etch' approach.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Dental Materials",
title = "Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization",
pages = "181-171",
number = "2",
volume = "31",
doi = "10.1016/j.dental.2014.11.017"
}

Lezaja, M., Veljović, Đ., Manojlović, D., Milošević, M., Mitrović, N., Janaćković, Đ.,& Miletić, V.. (2015). Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization. in Dental Materials
Elsevier Sci Ltd, Oxford., 31(2), 171-181.
https://doi.org/10.1016/j.dental.2014.11.017

Lezaja M, Veljović Đ, Manojlović D, Milošević M, Mitrović N, Janaćković Đ, Miletić V. Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization. in Dental Materials. 2015;31(2):171-181.
doi:10.1016/j.dental.2014.11.017 .

Lezaja, Maja, Veljović, Đorđe, Manojlović, Dragica, Milošević, Miloš, Mitrović, Nenad, Janaćković, Đorđe, Miletić, Vesna, "Bond strength of restorative materials to hydroxyapatite inserts and dimensional changes of insert-containing restorations during polymerization" in Dental Materials, 31, no. 2 (2015):171-181,
https://doi.org/10.1016/j.dental.2014.11.017 . .

TY  - JOUR
AU  - Veljović, Đorđe
AU  - Jančić-Heinemann, Radmila
AU  - Balać, Igor
AU  - Jokić, B.
AU  - Putić, Slaviša
AU  - Petrović, R.
AU  - Janaćković, Đorđe
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1156
AB  - In this study, the influence of the shape and size of the pores on the mechanical properties of the obtained porous HAP-based bioceramics was investigated. The porous HAP-based bioceramics were obtained starting from spherical calcium hydroxyapatite powder, obtained by hydrothermal syntheses. The number of shapeless inter-agglomerate pores decreased and amount of spherical intra-agglomerate pores increased on increasing the sintering temperature from 1100 degrees C to 1250 degrees C. The shape of pores also changed with thermal treatment of specimens; the small pores remained spherical while the larger pores became more spherical in shape, as was proved by image analysis. A three-dimensional, finite element unit cell model was applied to evaluate the influence of pore shape on the mechanical strength of HAP ceramics. By analyzing the effect of. the shape of pores to the fracture toughness of sintered porous HAP bioceramics, it was observed that the more spherical the pores were, the tougher became the bioceramics. After sintering at 1250 degrees C for 2 h, measured toughness was 1.31 MPa m(1/2), which is a relatively high value for this type of bioceramics.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics
EP  - 479
IS  - 2
SP  - 471
VL  - 37
DO  - 10.1016/j.ceramint.2010.09.014
ER  - 

@article{
author = "Veljović, Đorđe and Jančić-Heinemann, Radmila and Balać, Igor and Jokić, B. and Putić, Slaviša and Petrović, R. and Janaćković, Đorđe",
year = "2011",
abstract = "In this study, the influence of the shape and size of the pores on the mechanical properties of the obtained porous HAP-based bioceramics was investigated. The porous HAP-based bioceramics were obtained starting from spherical calcium hydroxyapatite powder, obtained by hydrothermal syntheses. The number of shapeless inter-agglomerate pores decreased and amount of spherical intra-agglomerate pores increased on increasing the sintering temperature from 1100 degrees C to 1250 degrees C. The shape of pores also changed with thermal treatment of specimens; the small pores remained spherical while the larger pores became more spherical in shape, as was proved by image analysis. A three-dimensional, finite element unit cell model was applied to evaluate the influence of pore shape on the mechanical strength of HAP ceramics. By analyzing the effect of. the shape of pores to the fracture toughness of sintered porous HAP bioceramics, it was observed that the more spherical the pores were, the tougher became the bioceramics. After sintering at 1250 degrees C for 2 h, measured toughness was 1.31 MPa m(1/2), which is a relatively high value for this type of bioceramics.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics",
pages = "479-471",
number = "2",
volume = "37",
doi = "10.1016/j.ceramint.2010.09.014"
}

Veljović, Đ., Jančić-Heinemann, R., Balać, I., Jokić, B., Putić, S., Petrović, R.,& Janaćković, Đ.. (2011). The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics. in Ceramics International
Elsevier Sci Ltd, Oxford., 37(2), 471-479.
https://doi.org/10.1016/j.ceramint.2010.09.014

Veljović Đ, Jančić-Heinemann R, Balać I, Jokić B, Putić S, Petrović R, Janaćković Đ. The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics. in Ceramics International. 2011;37(2):471-479.
doi:10.1016/j.ceramint.2010.09.014 .

Veljović, Đorđe, Jančić-Heinemann, Radmila, Balać, Igor, Jokić, B., Putić, Slaviša, Petrović, R., Janaćković, Đorđe, "The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics" in Ceramics International, 37, no. 2 (2011):471-479,
https://doi.org/10.1016/j.ceramint.2010.09.014 . .

TY  - JOUR
AU  - Veljović, Đorđe
AU  - Palcevskis, E.
AU  - Dindune, A.
AU  - Putić, Slaviša
AU  - Balać, Igor
AU  - Petrović, R.
AU  - Janaćković, Đorđe
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1083
AB  - Starting from two microspherical agglomerated HAP powders, porous biphasic HAP/TCP bioceramics were obtained by microwave sintering. During the sintering the HAP powders turned into biphasic mixtures, whereby HAP was the dominant crystalline phase in the case of the sample with the higher Ca/P ratio (HAP1) while alpha-TCP was the dominant crystalline phase in the sample with lower Ca/P ratio (HAP2). The porous microstructures of the obtained bioceramics were characterized by spherical intra-agglomerate pores and shapeless inter-agglomerate pores. The fracture toughness of the HAP1 and HAP2 samples microwave sintered at 1200 A degrees C for 15 min were 1.25 MPa m(1/2). The phase composition of the obtained bioceramics only had a minor effect on the indentation fracture toughness compared to a unique microstructure consisting of spherical intra-agglomerate pores with strong bonds between the spherical agglomerates. Cold isostatic pressing at 400 MPa before microwave sintering led to an increase in the fracture toughness of the biphasic HAP/TCP bioceramics to 1.35 MPa m(1/2).
PB  - Springer, New York
T2  - Journal of Materials Science
T1  - Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing
EP  - 3183
IS  - 12
SP  - 3175
VL  - 45
DO  - 10.1007/s10853-010-4324-8
ER  - 

@article{
author = "Veljović, Đorđe and Palcevskis, E. and Dindune, A. and Putić, Slaviša and Balać, Igor and Petrović, R. and Janaćković, Đorđe",
year = "2010",
abstract = "Starting from two microspherical agglomerated HAP powders, porous biphasic HAP/TCP bioceramics were obtained by microwave sintering. During the sintering the HAP powders turned into biphasic mixtures, whereby HAP was the dominant crystalline phase in the case of the sample with the higher Ca/P ratio (HAP1) while alpha-TCP was the dominant crystalline phase in the sample with lower Ca/P ratio (HAP2). The porous microstructures of the obtained bioceramics were characterized by spherical intra-agglomerate pores and shapeless inter-agglomerate pores. The fracture toughness of the HAP1 and HAP2 samples microwave sintered at 1200 A degrees C for 15 min were 1.25 MPa m(1/2). The phase composition of the obtained bioceramics only had a minor effect on the indentation fracture toughness compared to a unique microstructure consisting of spherical intra-agglomerate pores with strong bonds between the spherical agglomerates. Cold isostatic pressing at 400 MPa before microwave sintering led to an increase in the fracture toughness of the biphasic HAP/TCP bioceramics to 1.35 MPa m(1/2).",
publisher = "Springer, New York",
journal = "Journal of Materials Science",
title = "Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing",
pages = "3183-3175",
number = "12",
volume = "45",
doi = "10.1007/s10853-010-4324-8"
}

Veljović, Đ., Palcevskis, E., Dindune, A., Putić, S., Balać, I., Petrović, R.,& Janaćković, Đ.. (2010). Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing. in Journal of Materials Science
Springer, New York., 45(12), 3175-3183.
https://doi.org/10.1007/s10853-010-4324-8

Veljović Đ, Palcevskis E, Dindune A, Putić S, Balać I, Petrović R, Janaćković Đ. Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing. in Journal of Materials Science. 2010;45(12):3175-3183.
doi:10.1007/s10853-010-4324-8 .

Veljović, Đorđe, Palcevskis, E., Dindune, A., Putić, Slaviša, Balać, Igor, Petrović, R., Janaćković, Đorđe, "Microwave sintering improves the mechanical properties of biphasic calcium phosphates from hydroxyapatite microspheres produced from hydrothermal processing" in Journal of Materials Science, 45, no. 12 (2010):3175-3183,
https://doi.org/10.1007/s10853-010-4324-8 . .