TY  - JOUR
AU  - Kokunešoski, Maja
AU  - Stanković, Miroslav
AU  - Vuković, Marina
AU  - Majstorović, Jelena
AU  - Šaponjić, Đorđe
AU  - Ilić, Svetlana
AU  - Šaponjić, Aleksandra
PY  - 2020
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5222
AB  - Macroporous silica ceramic was obtained using clay and diatomite. Boric acid as a low-cost additive in the amount of 1 wt% was used. These porous materials were obtained at low forming pressure (40-80 MPa) and lower sintering temperature (850-1300 ºC) for 4h in air. The influence of boric acid, forming pressure, and sintering temperature on the microstructure, porosity parameters, and mechanical properties of obtained porous monoliths were investigated. As-received and the modified samples were characterized by X-ray diffraction, FTIR, SEM, and mercury porosimetry measurements. As for modified clay and diatomite, they were pressed at 60 MPa and then sintered at 1150 ºC, obtaining porosities of about 10 % and 60 %, respectively. Both of the analyzed samples had the pore diameter in the range of macroporous materials. The pore diameters of clay samples are ranging from 0.1-10 μm, whereas the pore diameter of diatomite samples was slightly lower with values ranging from 0.05-5 μm. Modified diatomite samples have a lower Young modulus in comparison to modified clay samples.
T2  - Science of Sintering
T1  - Macroporous monoliths based оn natural mineral sources, clay аnd diatomite
VL  - 52
IS  - 3
SP  - 339
EP  - 348
DO  - 10.2298/SOS2003339K
ER  - 

@article{
author = "Kokunešoski, Maja and Stanković, Miroslav and Vuković, Marina and Majstorović, Jelena and Šaponjić, Đorđe and Ilić, Svetlana and Šaponjić, Aleksandra",
year = "2020",
abstract = "Macroporous silica ceramic was obtained using clay and diatomite. Boric acid as a low-cost additive in the amount of 1 wt% was used. These porous materials were obtained at low forming pressure (40-80 MPa) and lower sintering temperature (850-1300 ºC) for 4h in air. The influence of boric acid, forming pressure, and sintering temperature on the microstructure, porosity parameters, and mechanical properties of obtained porous monoliths were investigated. As-received and the modified samples were characterized by X-ray diffraction, FTIR, SEM, and mercury porosimetry measurements. As for modified clay and diatomite, they were pressed at 60 MPa and then sintered at 1150 ºC, obtaining porosities of about 10 % and 60 %, respectively. Both of the analyzed samples had the pore diameter in the range of macroporous materials. The pore diameters of clay samples are ranging from 0.1-10 μm, whereas the pore diameter of diatomite samples was slightly lower with values ranging from 0.05-5 μm. Modified diatomite samples have a lower Young modulus in comparison to modified clay samples.",
journal = "Science of Sintering",
title = "Macroporous monoliths based оn natural mineral sources, clay аnd diatomite",
volume = "52",
number = "3",
pages = "339-348",
doi = "10.2298/SOS2003339K"
}

Kokunešoski, M., Stanković, M., Vuković, M., Majstorović, J., Šaponjić, Đ., Ilić, S.,& Šaponjić, A.. (2020). Macroporous monoliths based оn natural mineral sources, clay аnd diatomite. in Science of Sintering, 52(3), 339-348.
https://doi.org/10.2298/SOS2003339K

Kokunešoski M, Stanković M, Vuković M, Majstorović J, Šaponjić Đ, Ilić S, Šaponjić A. Macroporous monoliths based оn natural mineral sources, clay аnd diatomite. in Science of Sintering. 2020;52(3):339-348.
doi:10.2298/SOS2003339K .

Kokunešoski, Maja, Stanković, Miroslav, Vuković, Marina, Majstorović, Jelena, Šaponjić, Đorđe, Ilić, Svetlana, Šaponjić, Aleksandra, "Macroporous monoliths based оn natural mineral sources, clay аnd diatomite" in Science of Sintering, 52, no. 3 (2020):339-348,
https://doi.org/10.2298/SOS2003339K . .

TY  - JOUR
AU  - Šaponjić, Aleksandra
AU  - Šaponjić, Đorđe
AU  - Perović, Ivana
AU  - Vuković, Marina
AU  - Nikolić, Vladimir
AU  - Kaninski, Milica Marčeta
AU  - Kokunešoski, Maja
PY  - 2019
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/3700
AB  - Co-Mo carbides were prepared by impregnation with aqueous solution of metal salts and sucrose into ordered mesoporous SBA-15 silica template using carbothermal hydrogen reduction. Bimetallic Co-Mo carbide obtained by using carbothermal hydrogen reduction of Co-Mo precursors is formed when the Co-Mo molar ratio is 1.0. The obtained samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. Electrochemical characterization of obtained materials wеre performed by cyclic voltammetry in acid solution.
PB  - International Institute for the Science of Sintering (IISS)
T2  - Science of Sintering
T1  - Synthesis and characterization of co-mo bimetallic carbides
VL  - 51
IS  - 3
SP  - 319
EP  - 326
DO  - 10.2298/SOS1903319S
ER  - 

@article{
author = "Šaponjić, Aleksandra and Šaponjić, Đorđe and Perović, Ivana and Vuković, Marina and Nikolić, Vladimir and Kaninski, Milica Marčeta and Kokunešoski, Maja",
year = "2019",
abstract = "Co-Mo carbides were prepared by impregnation with aqueous solution of metal salts and sucrose into ordered mesoporous SBA-15 silica template using carbothermal hydrogen reduction. Bimetallic Co-Mo carbide obtained by using carbothermal hydrogen reduction of Co-Mo precursors is formed when the Co-Mo molar ratio is 1.0. The obtained samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. Electrochemical characterization of obtained materials wеre performed by cyclic voltammetry in acid solution.",
publisher = "International Institute for the Science of Sintering (IISS)",
journal = "Science of Sintering",
title = "Synthesis and characterization of co-mo bimetallic carbides",
volume = "51",
number = "3",
pages = "319-326",
doi = "10.2298/SOS1903319S"
}

Šaponjić, A., Šaponjić, Đ., Perović, I., Vuković, M., Nikolić, V., Kaninski, M. M.,& Kokunešoski, M.. (2019). Synthesis and characterization of co-mo bimetallic carbides. in Science of Sintering
International Institute for the Science of Sintering (IISS)., 51(3), 319-326.
https://doi.org/10.2298/SOS1903319S

Šaponjić A, Šaponjić Đ, Perović I, Vuković M, Nikolić V, Kaninski MM, Kokunešoski M. Synthesis and characterization of co-mo bimetallic carbides. in Science of Sintering. 2019;51(3):319-326.
doi:10.2298/SOS1903319S .

Šaponjić, Aleksandra, Šaponjić, Đorđe, Perović, Ivana, Vuković, Marina, Nikolić, Vladimir, Kaninski, Milica Marčeta, Kokunešoski, Maja, "Synthesis and characterization of co-mo bimetallic carbides" in Science of Sintering, 51, no. 3 (2019):319-326,
https://doi.org/10.2298/SOS1903319S . .

TY  - JOUR
AU  - Šaponjić, Aleksandra
AU  - Šaponjić, Đorđe
AU  - Nikolić, Violeta N.
AU  - Milošević, Maja
AU  - Marinović-Cincović, Milena
AU  - Gyoshev, Stanislav
AU  - Vuković, Marina
AU  - Kokunešoski, Maja
PY  - 2017
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5225
AB  - Amorphous iron (III) oxide was obtained from clay, using ammonium hydroxide as a precipitating agent. Influence of freeze drying under vacuum, as a drying method, on particle size, chemical composition, and crystallinity of obtained iron (III) oxide powder was investigated. After freeze drying, precipitate was annealed in air at 500 C-o and 900 oC. X-ray diffraction, particle size analysis, scanning electron microscopy, energy dispersive spectrometry, Fourier transform infrared spectroscopy, thermogravimetric and differential thermal analysis were used to characterize obtained iron (III) oxide powder. All of three powders obtained by freeze drying and annealing, have low crystallinity and particles with irregular layered shape. Narrow particle size distribution was given by an average diameter value of around 50 mu m for all observed powders. Iron-bearing materials like a-Fe2O3 and gamma-Fe2O3 are obtained. Differential thermal analysis curve of obtained samples showed endothermic reaction at 620 oC which could be ascribed to phase transition from cubic form gamma- - GT alpha- Fe2O3. Thermal transformations of iron (III) oxide, obtained from clay as a natural source, is suitable to explore in the framework of materials chemistry, and opens the possibility to synthesize materials based on Fe2O3 with specific magnetic behavior.
T2  - Science of Sintering
T1  - Iron (III) Oxide Fabrication From Natural Clay With Reference to Phase Transformation gamma- - GT alpha- Fe2O3
VL  - 49
IS  - 2
SP  - 197
EP  - 205
DO  - 10.2298/SOS1702197S
ER  - 

@article{
author = "Šaponjić, Aleksandra and Šaponjić, Đorđe and Nikolić, Violeta N. and Milošević, Maja and Marinović-Cincović, Milena and Gyoshev, Stanislav and Vuković, Marina and Kokunešoski, Maja",
year = "2017",
abstract = "Amorphous iron (III) oxide was obtained from clay, using ammonium hydroxide as a precipitating agent. Influence of freeze drying under vacuum, as a drying method, on particle size, chemical composition, and crystallinity of obtained iron (III) oxide powder was investigated. After freeze drying, precipitate was annealed in air at 500 C-o and 900 oC. X-ray diffraction, particle size analysis, scanning electron microscopy, energy dispersive spectrometry, Fourier transform infrared spectroscopy, thermogravimetric and differential thermal analysis were used to characterize obtained iron (III) oxide powder. All of three powders obtained by freeze drying and annealing, have low crystallinity and particles with irregular layered shape. Narrow particle size distribution was given by an average diameter value of around 50 mu m for all observed powders. Iron-bearing materials like a-Fe2O3 and gamma-Fe2O3 are obtained. Differential thermal analysis curve of obtained samples showed endothermic reaction at 620 oC which could be ascribed to phase transition from cubic form gamma- - GT alpha- Fe2O3. Thermal transformations of iron (III) oxide, obtained from clay as a natural source, is suitable to explore in the framework of materials chemistry, and opens the possibility to synthesize materials based on Fe2O3 with specific magnetic behavior.",
journal = "Science of Sintering",
title = "Iron (III) Oxide Fabrication From Natural Clay With Reference to Phase Transformation gamma- - GT alpha- Fe2O3",
volume = "49",
number = "2",
pages = "197-205",
doi = "10.2298/SOS1702197S"
}

Šaponjić, A., Šaponjić, Đ., Nikolić, V. N., Milošević, M., Marinović-Cincović, M., Gyoshev, S., Vuković, M.,& Kokunešoski, M.. (2017). Iron (III) Oxide Fabrication From Natural Clay With Reference to Phase Transformation gamma- - GT alpha- Fe2O3. in Science of Sintering, 49(2), 197-205.
https://doi.org/10.2298/SOS1702197S

Šaponjić A, Šaponjić Đ, Nikolić VN, Milošević M, Marinović-Cincović M, Gyoshev S, Vuković M, Kokunešoski M. Iron (III) Oxide Fabrication From Natural Clay With Reference to Phase Transformation gamma- - GT alpha- Fe2O3. in Science of Sintering. 2017;49(2):197-205.
doi:10.2298/SOS1702197S .

Šaponjić, Aleksandra, Šaponjić, Đorđe, Nikolić, Violeta N., Milošević, Maja, Marinović-Cincović, Milena, Gyoshev, Stanislav, Vuković, Marina, Kokunešoski, Maja, "Iron (III) Oxide Fabrication From Natural Clay With Reference to Phase Transformation gamma- - GT alpha- Fe2O3" in Science of Sintering, 49, no. 2 (2017):197-205,
https://doi.org/10.2298/SOS1702197S . .

TY  - CONF
AU  - Kokunešoski, Maja
AU  - Šaponjić, Aleksandra
AU  - Stanković, Miroslav
AU  - Vuković, Marina
AU  - Majstorović, Jelena
AU  - Jordanov, Dragana
AU  - Marčeta Kaninski, Milica
PY  - 2017
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5289
AB  - Starting raw materials, clay and diatomite, from coal mine Kolubara, Serbia were purified using heat and chemical treatment. Porous silica ceramics were obtained at low forming pressure (40-80 MPa) and low sintering temperature (1000-1300 °C) in air. Boric acid as a /ow-cost additive was used. Sintered samples have average pore si:ze diameters ranging of macroporous for clay 0.1-10 μm and for diatomite 0.05-5 μm. As-received and the obtained samples were characterized by XRD, SEM and mercury porosimetry measurements. Relations between mechanical characteristics of samples formed at different temperature were studied.
PB  - University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia
C3  - 6th International Symposium Mining and Enviromental Protection Proceedings
T1  - Porous ceramics based on natural mineral sources
SP  - 381
EP  - 386
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5289
ER  - 

@conference{
author = "Kokunešoski, Maja and Šaponjić, Aleksandra and Stanković, Miroslav and Vuković, Marina and Majstorović, Jelena and Jordanov, Dragana and Marčeta Kaninski, Milica",
year = "2017",
abstract = "Starting raw materials, clay and diatomite, from coal mine Kolubara, Serbia were purified using heat and chemical treatment. Porous silica ceramics were obtained at low forming pressure (40-80 MPa) and low sintering temperature (1000-1300 °C) in air. Boric acid as a /ow-cost additive was used. Sintered samples have average pore si:ze diameters ranging of macroporous for clay 0.1-10 μm and for diatomite 0.05-5 μm. As-received and the obtained samples were characterized by XRD, SEM and mercury porosimetry measurements. Relations between mechanical characteristics of samples formed at different temperature were studied.",
publisher = "University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia",
journal = "6th International Symposium Mining and Enviromental Protection Proceedings",
title = "Porous ceramics based on natural mineral sources",
pages = "381-386",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5289"
}

Kokunešoski, M., Šaponjić, A., Stanković, M., Vuković, M., Majstorović, J., Jordanov, D.,& Marčeta Kaninski, M.. (2017). Porous ceramics based on natural mineral sources. in 6th International Symposium Mining and Enviromental Protection Proceedings
University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia., 381-386.
https://hdl.handle.net/21.15107/rcub_cherry_5289

Kokunešoski M, Šaponjić A, Stanković M, Vuković M, Majstorović J, Jordanov D, Marčeta Kaninski M. Porous ceramics based on natural mineral sources. in 6th International Symposium Mining and Enviromental Protection Proceedings. 2017;:381-386.
https://hdl.handle.net/21.15107/rcub_cherry_5289 .

Kokunešoski, Maja, Šaponjić, Aleksandra, Stanković, Miroslav, Vuković, Marina, Majstorović, Jelena, Jordanov, Dragana, Marčeta Kaninski, Milica, "Porous ceramics based on natural mineral sources" in 6th International Symposium Mining and Enviromental Protection Proceedings (2017):381-386,
https://hdl.handle.net/21.15107/rcub_cherry_5289 .

TY  - CONF
AU  - Šaponjić, Aleksandra
AU  - Kokunešoski, Maja
AU  - Perović, Ivana
AU  - Vuković, Marina
AU  - Šaponjić, Đorđe
AU  - Nikolić, Vladimir
AU  - Marčeta Kaninski, Milica
PY  - 2017
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/5288
AB  - Co/Mo carbides were prepared by co-impregnation with aqueous solution of metal salts and sucrose into ordered mesoporous SBA-15 silica template using carbothermal hydrogen reduction. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS) . Electrochemical characterization of obtained materials was performed by cyclic voltammetry in acide solution. Bimetallic CoMo carbide obtained by using carbothermal hydrogen reduction of Co Mo precursors is formed when the Co/Mo molar ratio is 1.0.
PB  - University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia
C3  - 6th International Symposium Mining and Enviromental Protection Proceedings
T1  - Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization
SP  - 375
EP  - 380
UR  - https://hdl.handle.net/21.15107/rcub_cherry_5288
ER  - 

@conference{
author = "Šaponjić, Aleksandra and Kokunešoski, Maja and Perović, Ivana and Vuković, Marina and Šaponjić, Đorđe and Nikolić, Vladimir and Marčeta Kaninski, Milica",
year = "2017",
abstract = "Co/Mo carbides were prepared by co-impregnation with aqueous solution of metal salts and sucrose into ordered mesoporous SBA-15 silica template using carbothermal hydrogen reduction. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS) . Electrochemical characterization of obtained materials was performed by cyclic voltammetry in acide solution. Bimetallic CoMo carbide obtained by using carbothermal hydrogen reduction of Co Mo precursors is formed when the Co/Mo molar ratio is 1.0.",
publisher = "University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia",
journal = "6th International Symposium Mining and Enviromental Protection Proceedings",
title = "Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization",
pages = "375-380",
url = "https://hdl.handle.net/21.15107/rcub_cherry_5288"
}

Šaponjić, A., Kokunešoski, M., Perović, I., Vuković, M., Šaponjić, Đ., Nikolić, V.,& Marčeta Kaninski, M.. (2017). Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization. in 6th International Symposium Mining and Enviromental Protection Proceedings
University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia., 375-380.
https://hdl.handle.net/21.15107/rcub_cherry_5288

Šaponjić A, Kokunešoski M, Perović I, Vuković M, Šaponjić Đ, Nikolić V, Marčeta Kaninski M. Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization. in 6th International Symposium Mining and Enviromental Protection Proceedings. 2017;:375-380.
https://hdl.handle.net/21.15107/rcub_cherry_5288 .

Šaponjić, Aleksandra, Kokunešoski, Maja, Perović, Ivana, Vuković, Marina, Šaponjić, Đorđe, Nikolić, Vladimir, Marčeta Kaninski, Milica, "Co/Mo bimetallic carbides with potential applications as catalyst support in pem fuel cells - synthesis and characterization" in 6th International Symposium Mining and Enviromental Protection Proceedings (2017):375-380,
https://hdl.handle.net/21.15107/rcub_cherry_5288 .