Veljović, Đ., Đošić, M., Zvicer, J., Zebić, M., Janaćković, Đ., Janković, A., Matić, T., Miletić, V., Nešović, K., Obradović, B., Osmokrović, A., Petrović, R., Mišković-Stanković, V., Stevanović, M.,& Stojkovska, J.. (2021). New multifunctional biomaterials for medical application. in 35. Međunarodni festival inovacija, znanja i stvaralaštva TESLA FEST 2021
Novi Sad : Savez pronalazača Vojvodine., 5-5.

Veljović Đ, Đošić M, Zvicer J, Zebić M, Janaćković Đ, Janković A, Matić T, Miletić V, Nešović K, Obradović B, Osmokrović A, Petrović R, Mišković-Stanković V, Stevanović M, Stojkovska J. New multifunctional biomaterials for medical application. in 35. Međunarodni festival inovacija, znanja i stvaralaštva TESLA FEST 2021. 2021;:5-5..

Veljović, Đorđe, Đošić, Marija, Zvicer, Jovana, Zebić, Maja, Janaćković, Đorđe, Janković, Ana, Matić, Tamara, Miletić, Vesna, Nešović, Katarina, Obradović, Bojana, Osmokrović, Andrea, Petrović, Rada, Mišković-Stanković, Vesna, Stevanović, Milena, Stojkovska, Jasmina, "New multifunctional biomaterials for medical application" in 35. Međunarodni festival inovacija, znanja i stvaralaštva TESLA FEST 2021 (2021):5-5.

TY  - CONF
AU  - Sokić, Katarina
AU  - Veljović, Đorđe
AU  - Dikić, Jelena
AU  - Stojanović, Jovica
AU  - Smiljanić, Danijela
AU  - Jevtić, Sanja
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/728
AB  - The aim of this study was to investigate the possibilities and to optimize the conditions for the synthesis of hydroxyapatite (HAP) on calcium-enriched natural and synthetic zeolites as carriers. Two synthetic zeolites were used in the paper: zeolite 4A (Na-form) and zeolite 5A (Ca-form) as well as natural zeolite - clinoptilolite from Slanci deposit in Serbia.
Clinoptilolite and zeolite 4A were enriched with calcium ions by ion exchange treatmentin order to enable the source of Ca2+in the crystallization of hydroxyapatite. Phosphorus, necessary for the crystallization of hydroxyapatite, was introduced through a solution of ammonium-hydrogenphosphate. The influence of the concentration of hydrogen phosphate ions, temperature and crystallization time of hydroxyapatite on the morphology of the zeolite surface as well as the degree of its coverage with newly formed hydroxyapatite particles was monitored in the experiments. The obtained powders were characterized by X-ray powder diffraction (XRD), thermal TG-DTG analysis, infrared spectroscopy with Fourier transformation (FTIR) and scanning electron microscopy (SEM). Based on the structural analysis, it was shown that the synthesis of hydroxyapatite did not affect on the structure of the zeolite, except in the case when a very concentrated hydrogen-phosphate solution was used. Thermal analysis showed that all obtained zeolite and HAP samples were stable up to 800 °C. Optimization of the hydrothermal crystallization process showed that temperature and time do not have a crucial influence on the synthesis of the materials (similar results were obtained at 120 °C for 20 hours and at 160 °C for 4 hours). When the concentration of the solution of ammonium hydrogen phosphate was higher, larger crystals of hydroxyapatite were obtained, but the crystal lattice of the zeolite was collapsed. SEM micrography showed that unevenly distributed hydroxyapatite crystals were formed on natural zeolite due to the presence of various impurities, while the best results were achieved using zeolite 5A, where
the surface of the zeolite is completely covered with crystals of hydroxyapatite.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Nineteenth Young Researchers’ Conference - Materials Science and Engineering
T1  - Hydrothermal synthesis of hydroxyapatite on calcium-enriched natural and synthetic zeolite as a carrier
EP  - 75
SP  - 75
ER  - 

@conference{
author = "Sokić, Katarina and Veljović, Đorđe and Dikić, Jelena and Stojanović, Jovica and Smiljanić, Danijela and Jevtić, Sanja",
year = "2021",
abstract = "The aim of this study was to investigate the possibilities and to optimize the conditions for the synthesis of hydroxyapatite (HAP) on calcium-enriched natural and synthetic zeolites as carriers. Two synthetic zeolites were used in the paper: zeolite 4A (Na-form) and zeolite 5A (Ca-form) as well as natural zeolite - clinoptilolite from Slanci deposit in Serbia.
Clinoptilolite and zeolite 4A were enriched with calcium ions by ion exchange treatmentin order to enable the source of Ca2+in the crystallization of hydroxyapatite. Phosphorus, necessary for the crystallization of hydroxyapatite, was introduced through a solution of ammonium-hydrogenphosphate. The influence of the concentration of hydrogen phosphate ions, temperature and crystallization time of hydroxyapatite on the morphology of the zeolite surface as well as the degree of its coverage with newly formed hydroxyapatite particles was monitored in the experiments. The obtained powders were characterized by X-ray powder diffraction (XRD), thermal TG-DTG analysis, infrared spectroscopy with Fourier transformation (FTIR) and scanning electron microscopy (SEM). Based on the structural analysis, it was shown that the synthesis of hydroxyapatite did not affect on the structure of the zeolite, except in the case when a very concentrated hydrogen-phosphate solution was used. Thermal analysis showed that all obtained zeolite and HAP samples were stable up to 800 °C. Optimization of the hydrothermal crystallization process showed that temperature and time do not have a crucial influence on the synthesis of the materials (similar results were obtained at 120 °C for 20 hours and at 160 °C for 4 hours). When the concentration of the solution of ammonium hydrogen phosphate was higher, larger crystals of hydroxyapatite were obtained, but the crystal lattice of the zeolite was collapsed. SEM micrography showed that unevenly distributed hydroxyapatite crystals were formed on natural zeolite due to the presence of various impurities, while the best results were achieved using zeolite 5A, where
the surface of the zeolite is completely covered with crystals of hydroxyapatite.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Nineteenth Young Researchers’ Conference - Materials Science and Engineering",
title = "Hydrothermal synthesis of hydroxyapatite on calcium-enriched natural and synthetic zeolite as a carrier",
pages = "75-75"
}

Sokić, K., Veljović, Đ., Dikić, J., Stojanović, J., Smiljanić, D.,& Jevtić, S.. (2021). Hydrothermal synthesis of hydroxyapatite on calcium-enriched natural and synthetic zeolite as a carrier. in Nineteenth Young Researchers’ Conference - Materials Science and Engineering
Belgrade : Institute of Technical Sciences of SASA., 75-75.

Sokić K, Veljović Đ, Dikić J, Stojanović J, Smiljanić D, Jevtić S. Hydrothermal synthesis of hydroxyapatite on calcium-enriched natural and synthetic zeolite as a carrier. in Nineteenth Young Researchers’ Conference - Materials Science and Engineering. 2021;:75-75..

Sokić, Katarina, Veljović, Đorđe, Dikić, Jelena, Stojanović, Jovica, Smiljanić, Danijela, Jevtić, Sanja, "Hydrothermal synthesis of hydroxyapatite on calcium-enriched natural and synthetic zeolite as a carrier" in Nineteenth Young Researchers’ Conference - Materials Science and Engineering (2021):75-75.

TY  - CONF
AU  - Topalović, Vladimir
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
AU  - Grujić, Snežana
AU  - Veljović, Đorđe
AU  - Smiljanić, Sonja
AU  - Đošić, Marija
PY  - 2015
UR  - https://ritnms.itnms.ac.rs/handle/123456789/699
AB  - Cordierite (2MgO·2Al2O3·5SiO2) as a ceramic material has great importance in materials science and wide application in industry thanks to its low thermal expansion and dielectric constant, high chemical and thermal stability and high electrical resistivity. Cordierite ceramics is used for producing supports for electric heaters, ceramic fire resistant materials for furnaces, catalyst supports for the complete combustion of exhaust gases of internal combustion engines, insulation material in high frequency electronics, as well as substrates for integrated circuits and electronic modules. Properties of sintered cordierite ceramics, where cordierite powders were obtained by alkoxide hydrolitic and non-hydrolitic method, colloidal method and starting from silicic acid, were studied and compared. The properties of sintered materials were observed by SEM of the fracture surfaces and polished and thermally etched samples. The mechanical properties of obtained materials, microhardness and indentation fracture toughness, were determined by microindentation method. The best sinterability showed powder obtained by colloidal method (sintering temperature of 1370 °C for 2 h), and powder obtained by Si-acid method (sintering temperature of 1400 °C for 2h).
PB  - Novi Sad : University of Novi Sad, Faculty of Technology
C3  - 11th Conference for Young Scientists in Ceramics
T1  - Properties of sintered cordierite ceramics obtained by sol-gel methods of powder synthesis
EP  - 109
SP  - 108
ER  - 

@conference{
author = "Topalović, Vladimir and Janaćković, Đorđe and Petrović, Rada and Grujić, Snežana and Veljović, Đorđe and Smiljanić, Sonja and Đošić, Marija",
year = "2015",
abstract = "Cordierite (2MgO·2Al2O3·5SiO2) as a ceramic material has great importance in materials science and wide application in industry thanks to its low thermal expansion and dielectric constant, high chemical and thermal stability and high electrical resistivity. Cordierite ceramics is used for producing supports for electric heaters, ceramic fire resistant materials for furnaces, catalyst supports for the complete combustion of exhaust gases of internal combustion engines, insulation material in high frequency electronics, as well as substrates for integrated circuits and electronic modules. Properties of sintered cordierite ceramics, where cordierite powders were obtained by alkoxide hydrolitic and non-hydrolitic method, colloidal method and starting from silicic acid, were studied and compared. The properties of sintered materials were observed by SEM of the fracture surfaces and polished and thermally etched samples. The mechanical properties of obtained materials, microhardness and indentation fracture toughness, were determined by microindentation method. The best sinterability showed powder obtained by colloidal method (sintering temperature of 1370 °C for 2 h), and powder obtained by Si-acid method (sintering temperature of 1400 °C for 2h).",
publisher = "Novi Sad : University of Novi Sad, Faculty of Technology",
journal = "11th Conference for Young Scientists in Ceramics",
title = "Properties of sintered cordierite ceramics obtained by sol-gel methods of powder synthesis",
pages = "109-108"
}

Topalović, V., Janaćković, Đ., Petrović, R., Grujić, S., Veljović, Đ., Smiljanić, S.,& Đošić, M.. (2015). Properties of sintered cordierite ceramics obtained by sol-gel methods of powder synthesis. in 11th Conference for Young Scientists in Ceramics
Novi Sad : University of Novi Sad, Faculty of Technology., 108-109.

Topalović V, Janaćković Đ, Petrović R, Grujić S, Veljović Đ, Smiljanić S, Đošić M. Properties of sintered cordierite ceramics obtained by sol-gel methods of powder synthesis. in 11th Conference for Young Scientists in Ceramics. 2015;:108-109..

Topalović, Vladimir, Janaćković, Đorđe, Petrović, Rada, Grujić, Snežana, Veljović, Đorđe, Smiljanić, Sonja, Đošić, Marija, "Properties of sintered cordierite ceramics obtained by sol-gel methods of powder synthesis" in 11th Conference for Young Scientists in Ceramics (2015):108-109.

TY  - JOUR
AU  - Mihailović, Marija
AU  - Patarić, Aleksandra
AU  - Gulišija, Zvonko
AU  - Veljović, Đorđe
AU  - Janaćković, Đorđe
PY  - 2011
UR  - https://ritnms.itnms.ac.rs/handle/123456789/200
AB  - Hidroksiapatit se široko koristi kao keramički biomaterijal zbog svoje bioaktivnosti koju ispoljava kada se u vidu prevlake nanese na metalni implantat, kao i zbog kompatibilnosti sa sastavom ljudskih kostiju. Prevlake hidroksiapatitnog nano-praha elektroforetski su istaložene na peskiranu površinu uzoraka od nerđajućeg 316LVM čelika, pri konstantnom naponu i za različito vreme taloženja, a potom sinterovane u vakuumu na 1040°C i u atmosferi argona na 1000°C. Premda visoke temperature sinterovanja, koje su neophodne kako bi se dobile kompaktne prevlake velike gustine, mogu da dovedu do faznih promena kod hidroksiapatita, u ovom radu je pokazano da je na supsrtatu od 316LVM čelika moguće dobiti bioaktivne prevlake u kojima nije došlo do fazne promene zahvaljujući prirodi korišćenog hidroskiapatitnog nano-praha stehiometrijskog sastava. Visokotemperaturna stabilnost korišćenog HAp praha potvrđena je DTA-TG analizom u temperaturnom opsegu 23-1000°C, tj. na temperaturama na kojima su rađeni eksperimenti sinterovanja. Mikrostrukturna karakterizacija nanetih prevlaka urađena je korišćenjem SEM, dok je za određivanje faznog sastava korišćena XRD analiza.
AB  - Hydroxyapatite is a widely used bioceramic material in implant coatings research because of its bioactive behavior when being deposited onto the metallic implant and compatibility with the human bones composition. The coating of nanosized hydroxyapatite was electrophoretically deposited on a blasted surface of stainless steel 316LVM samples at constant voltage, for different deposition times and subsequently sintered in both, vacuum and argon atmosphere, at 1040 and 1000°C, respectively. Although sintering temperatures needed to achieve highly dense coatings can cause HAp coating phase changes, the possibility to obtain a bioactive coating on 316LVM substrate, without the coatings phase changes due to the nature of the used stoichiometric nanostructured hydroxyapatite is presented in this work. The thermal stability of the used HAp powder was assessed by DTA-TG analyses over the temperature range of 23-1000°C, i.e., at the or nearby experimental sintering temperature. The microstructure characterization was accomplished using SEM, while phase composition was determined using XRD.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Elektroforetsko taloženje prevlaka hidroksiapatitnog nano-praha na čelik za izradu ortopedskih implantata 316LVM
T1  - Electrophoretically deposited nanosized hydroxyapatite coatings on 316LVM stainless steel for orthopaedic implants
EP  - 52
IS  - 1
SP  - 45
VL  - 17
DO  - 10.2298/CICEQ100326052M
UR  - conv_388
ER  - 

@article{
author = "Mihailović, Marija and Patarić, Aleksandra and Gulišija, Zvonko and Veljović, Đorđe and Janaćković, Đorđe",
year = "2011",
abstract = "Hidroksiapatit se široko koristi kao keramički biomaterijal zbog svoje bioaktivnosti koju ispoljava kada se u vidu prevlake nanese na metalni implantat, kao i zbog kompatibilnosti sa sastavom ljudskih kostiju. Prevlake hidroksiapatitnog nano-praha elektroforetski su istaložene na peskiranu površinu uzoraka od nerđajućeg 316LVM čelika, pri konstantnom naponu i za različito vreme taloženja, a potom sinterovane u vakuumu na 1040°C i u atmosferi argona na 1000°C. Premda visoke temperature sinterovanja, koje su neophodne kako bi se dobile kompaktne prevlake velike gustine, mogu da dovedu do faznih promena kod hidroksiapatita, u ovom radu je pokazano da je na supsrtatu od 316LVM čelika moguće dobiti bioaktivne prevlake u kojima nije došlo do fazne promene zahvaljujući prirodi korišćenog hidroskiapatitnog nano-praha stehiometrijskog sastava. Visokotemperaturna stabilnost korišćenog HAp praha potvrđena je DTA-TG analizom u temperaturnom opsegu 23-1000°C, tj. na temperaturama na kojima su rađeni eksperimenti sinterovanja. Mikrostrukturna karakterizacija nanetih prevlaka urađena je korišćenjem SEM, dok je za određivanje faznog sastava korišćena XRD analiza., Hydroxyapatite is a widely used bioceramic material in implant coatings research because of its bioactive behavior when being deposited onto the metallic implant and compatibility with the human bones composition. The coating of nanosized hydroxyapatite was electrophoretically deposited on a blasted surface of stainless steel 316LVM samples at constant voltage, for different deposition times and subsequently sintered in both, vacuum and argon atmosphere, at 1040 and 1000°C, respectively. Although sintering temperatures needed to achieve highly dense coatings can cause HAp coating phase changes, the possibility to obtain a bioactive coating on 316LVM substrate, without the coatings phase changes due to the nature of the used stoichiometric nanostructured hydroxyapatite is presented in this work. The thermal stability of the used HAp powder was assessed by DTA-TG analyses over the temperature range of 23-1000°C, i.e., at the or nearby experimental sintering temperature. The microstructure characterization was accomplished using SEM, while phase composition was determined using XRD.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Elektroforetsko taloženje prevlaka hidroksiapatitnog nano-praha na čelik za izradu ortopedskih implantata 316LVM, Electrophoretically deposited nanosized hydroxyapatite coatings on 316LVM stainless steel for orthopaedic implants",
pages = "52-45",
number = "1",
volume = "17",
doi = "10.2298/CICEQ100326052M",
url = "conv_388"
}

Mihailović, M., Patarić, A., Gulišija, Z., Veljović, Đ.,& Janaćković, Đ.. (2011). Elektroforetsko taloženje prevlaka hidroksiapatitnog nano-praha na čelik za izradu ortopedskih implantata 316LVM. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Savez hemijskih inženjera, Beograd., 17(1), 45-52.
https://doi.org/10.2298/CICEQ100326052M
conv_388

Mihailović M, Patarić A, Gulišija Z, Veljović Đ, Janaćković Đ. Elektroforetsko taloženje prevlaka hidroksiapatitnog nano-praha na čelik za izradu ortopedskih implantata 316LVM. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2011;17(1):45-52.
doi:10.2298/CICEQ100326052M
conv_388 .

Mihailović, Marija, Patarić, Aleksandra, Gulišija, Zvonko, Veljović, Đorđe, Janaćković, Đorđe, "Elektroforetsko taloženje prevlaka hidroksiapatitnog nano-praha na čelik za izradu ortopedskih implantata 316LVM" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 17, no. 1 (2011):45-52,
https://doi.org/10.2298/CICEQ100326052M .,
conv_388 .