TY  - JOUR
AU  - Veljović, Đorđe
AU  - Radovanović, Željko
AU  - Dindune, Antonija
AU  - Palcevskis, Eriks
AU  - Krumina, Aija
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2682
AB  - The aims of this study were to investigate the effects of Sr- and Mn-doped ions on the sintering behaviors, microstructure and mechanical properties of the bioceramics processed by single- and two-step microwave sintering (MWSSS and MWTSS). Nano-sized calcium hydroxyapatite powders doped with Sr and Mn ions, obtained by modified precipitation synthesis, were isostatically pressed at 400 MPa and processed by MWSSS and MWTSS at different temperatures. In all cases during the sintering, the doped HAP powders turned into biphasic mixtures of HAP and TCP, but the amount of TCP was certainly lower in the case of MWTSS. It was shown that the doped ions significantly affected: density, microstructure, grain size, porosity, hardness, and fracture toughness of the processed bioceramics. Two-step microwave sintering was successfully applied for the processing of HAP/TCP bioceramics doped with strontium and manganese ions. Both two-step microwave sintered doped bioceramics had similar and high hardness values, but the strontium-substituted bioceramic material certainly had higher fracture toughness (1.54 MPam(1/2)), with an average grain size of 195 nm. Based on the results presented in this paper, it was concluded that the two-step microwave sintered strontium-doped bioceramics could be suitable materials in the bone regenerative field.
PB  - Springer, New York
T2  - Journal of Materials Science
T1  - The influence of Sr and Mn incorporated ions on the properties of microwave single- and two-step sintered biphasic HAP/TCP bioceramics
EP  - 6802
IS  - 19
SP  - 6793
VL  - 49
DO  - 10.1007/s10853-014-8380-3
ER  - 

@article{
author = "Veljović, Đorđe and Radovanović, Željko and Dindune, Antonija and Palcevskis, Eriks and Krumina, Aija and Petrović, Rada and Janaćković, Đorđe",
year = "2014",
abstract = "The aims of this study were to investigate the effects of Sr- and Mn-doped ions on the sintering behaviors, microstructure and mechanical properties of the bioceramics processed by single- and two-step microwave sintering (MWSSS and MWTSS). Nano-sized calcium hydroxyapatite powders doped with Sr and Mn ions, obtained by modified precipitation synthesis, were isostatically pressed at 400 MPa and processed by MWSSS and MWTSS at different temperatures. In all cases during the sintering, the doped HAP powders turned into biphasic mixtures of HAP and TCP, but the amount of TCP was certainly lower in the case of MWTSS. It was shown that the doped ions significantly affected: density, microstructure, grain size, porosity, hardness, and fracture toughness of the processed bioceramics. Two-step microwave sintering was successfully applied for the processing of HAP/TCP bioceramics doped with strontium and manganese ions. Both two-step microwave sintered doped bioceramics had similar and high hardness values, but the strontium-substituted bioceramic material certainly had higher fracture toughness (1.54 MPam(1/2)), with an average grain size of 195 nm. Based on the results presented in this paper, it was concluded that the two-step microwave sintered strontium-doped bioceramics could be suitable materials in the bone regenerative field.",
publisher = "Springer, New York",
journal = "Journal of Materials Science",
title = "The influence of Sr and Mn incorporated ions on the properties of microwave single- and two-step sintered biphasic HAP/TCP bioceramics",
pages = "6802-6793",
number = "19",
volume = "49",
doi = "10.1007/s10853-014-8380-3"
}

Veljović, Đ., Radovanović, Ž., Dindune, A., Palcevskis, E., Krumina, A., Petrović, R.,& Janaćković, Đ.. (2014). The influence of Sr and Mn incorporated ions on the properties of microwave single- and two-step sintered biphasic HAP/TCP bioceramics. in Journal of Materials Science
Springer, New York., 49(19), 6793-6802.
https://doi.org/10.1007/s10853-014-8380-3

Veljović Đ, Radovanović Ž, Dindune A, Palcevskis E, Krumina A, Petrović R, Janaćković Đ. The influence of Sr and Mn incorporated ions on the properties of microwave single- and two-step sintered biphasic HAP/TCP bioceramics. in Journal of Materials Science. 2014;49(19):6793-6802.
doi:10.1007/s10853-014-8380-3 .

Veljović, Đorđe, Radovanović, Željko, Dindune, Antonija, Palcevskis, Eriks, Krumina, Aija, Petrović, Rada, Janaćković, Đorđe, "The influence of Sr and Mn incorporated ions on the properties of microwave single- and two-step sintered biphasic HAP/TCP bioceramics" in Journal of Materials Science, 49, no. 19 (2014):6793-6802,
https://doi.org/10.1007/s10853-014-8380-3 . .

TY  - JOUR
AU  - Janković, Ana
AU  - Eraković, Sanja
AU  - Dindune, Antonija
AU  - Veljović, Đorđe
AU  - Stevanović, Tatjana
AU  - Janaćković, Đorđe
AU  - Mišković-Stanković, Vesna
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2080
AB  - Titanium is a key biomedical material due to its good biocompatibility, mechanical properties and corrosion stability, but infections at the implantation site still pose a serious threat. One approach to prevent infection is to improve the antimicrobial ability of the coating material. Silver-doped hydroxyapatite (Ag/HAP) nanoparticles were synthesized by a new modified precipitation method. The synthesized powder was used for the preparation of Ag/HAP coating on titanium by electrophoretic deposition. The coating was characterized in terms of phase composition and structure by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD); the surface morphology and chemical composition was assessed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The research focused on an evaluation of the corrosion behaviour of Ag/HAP coating in simulated body fluid (SBF) at 37°C during prolonged immersion time by electrochemical impedance spectroscopy (EIS). The silver-doped HAP coating provided good corrosion protection in SBF solution.
AB  - Titan predstavlja ključni biomedicinski materijal zahvaljujući svojoj dobroj biokompatibilnosti, mehaničkim svojstvima i korozionoj stabilnosti, ali infekcije na mestu implantiranja i dalje predstavljaju ozbiljan problem. Jedan način da se predupredi infekcija je da se poboljša antimikrobna aktivnost materijala. Srebrom dopirane nanočestice hidroksiapatita sintetisane su novom modifikovanom precipitacionom metodom. Ovako sintetisani prah je korišćen za nanošenje prevlake srebro/hidroksiapatit na titan elektoforetskim taloženjem. Fazni sastav i struktura prevlake su karakterisani spektroskopijom infracrvene svetlosti sa Furijeovom transformacijom u modu totalne refleksije i difrakcijom X-zraka. Morfologija površine i hemijski sastav ispitivani su korišćenjem skenirajuće elektronske mikroskopije i energetske disperzione spektroskopije. Cilj istraživanja je ispitivanje korozione stabilnosti prevlake srebro/hidroksiapatit u simuliranoj telesnoj tečnosti koristeći spektroskopiju elektrohemijske impedancije. Prevlaka srebro/hidroksi-apatit obezbeđuje dobru zaštitu od korozije u simuliranoj telesnoj tečnosti.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical impedance spectroscopy of a silver-doped hydroxyapatite coating in simulated body fluid used as a corrosive agent
T1  - Spektroskopija elektrohemijske impedancije prevlake hidroksiapatita dopirane srebrom u simuliranoj telesnoj tečnosti korišćenoj kao korozioni agens
EP  - 1623
IS  - 11
SP  - 1609
VL  - 77
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2080
ER  - 

@article{
author = "Janković, Ana and Eraković, Sanja and Dindune, Antonija and Veljović, Đorđe and Stevanović, Tatjana and Janaćković, Đorđe and Mišković-Stanković, Vesna",
year = "2012",
abstract = "Titanium is a key biomedical material due to its good biocompatibility, mechanical properties and corrosion stability, but infections at the implantation site still pose a serious threat. One approach to prevent infection is to improve the antimicrobial ability of the coating material. Silver-doped hydroxyapatite (Ag/HAP) nanoparticles were synthesized by a new modified precipitation method. The synthesized powder was used for the preparation of Ag/HAP coating on titanium by electrophoretic deposition. The coating was characterized in terms of phase composition and structure by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray diffraction (XRD); the surface morphology and chemical composition was assessed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The research focused on an evaluation of the corrosion behaviour of Ag/HAP coating in simulated body fluid (SBF) at 37°C during prolonged immersion time by electrochemical impedance spectroscopy (EIS). The silver-doped HAP coating provided good corrosion protection in SBF solution., Titan predstavlja ključni biomedicinski materijal zahvaljujući svojoj dobroj biokompatibilnosti, mehaničkim svojstvima i korozionoj stabilnosti, ali infekcije na mestu implantiranja i dalje predstavljaju ozbiljan problem. Jedan način da se predupredi infekcija je da se poboljša antimikrobna aktivnost materijala. Srebrom dopirane nanočestice hidroksiapatita sintetisane su novom modifikovanom precipitacionom metodom. Ovako sintetisani prah je korišćen za nanošenje prevlake srebro/hidroksiapatit na titan elektoforetskim taloženjem. Fazni sastav i struktura prevlake su karakterisani spektroskopijom infracrvene svetlosti sa Furijeovom transformacijom u modu totalne refleksije i difrakcijom X-zraka. Morfologija površine i hemijski sastav ispitivani su korišćenjem skenirajuće elektronske mikroskopije i energetske disperzione spektroskopije. Cilj istraživanja je ispitivanje korozione stabilnosti prevlake srebro/hidroksiapatit u simuliranoj telesnoj tečnosti koristeći spektroskopiju elektrohemijske impedancije. Prevlaka srebro/hidroksi-apatit obezbeđuje dobru zaštitu od korozije u simuliranoj telesnoj tečnosti.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical impedance spectroscopy of a silver-doped hydroxyapatite coating in simulated body fluid used as a corrosive agent, Spektroskopija elektrohemijske impedancije prevlake hidroksiapatita dopirane srebrom u simuliranoj telesnoj tečnosti korišćenoj kao korozioni agens",
pages = "1623-1609",
number = "11",
volume = "77",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2080"
}

Janković, A., Eraković, S., Dindune, A., Veljović, Đ., Stevanović, T., Janaćković, Đ.,& Mišković-Stanković, V.. (2012). Electrochemical impedance spectroscopy of a silver-doped hydroxyapatite coating in simulated body fluid used as a corrosive agent. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 77(11), 1609-1623.
https://hdl.handle.net/21.15107/rcub_technorep_2080

Janković A, Eraković S, Dindune A, Veljović Đ, Stevanović T, Janaćković Đ, Mišković-Stanković V. Electrochemical impedance spectroscopy of a silver-doped hydroxyapatite coating in simulated body fluid used as a corrosive agent. in Journal of the Serbian Chemical Society. 2012;77(11):1609-1623.
https://hdl.handle.net/21.15107/rcub_technorep_2080 .

Janković, Ana, Eraković, Sanja, Dindune, Antonija, Veljović, Đorđe, Stevanović, Tatjana, Janaćković, Đorđe, Mišković-Stanković, Vesna, "Electrochemical impedance spectroscopy of a silver-doped hydroxyapatite coating in simulated body fluid used as a corrosive agent" in Journal of the Serbian Chemical Society, 77, no. 11 (2012):1609-1623,
https://hdl.handle.net/21.15107/rcub_technorep_2080 .

TY  - JOUR
AU  - Palcevskis, Eriks
AU  - Dindune, Antonija
AU  - Dekhtyar, Y.
AU  - Polyaka, N.
AU  - Veljović, Đorđe
AU  - Sammons, R. L.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1882
AB  - The influence of hydrogenation on the biocompatibility of different hydroxyapatite (HAP) materials was tested. Materials consisted of pure HAP, HAP substituted with manganese (Mn+2) and with magnesium (Mg+2) - all axially pressed and conventionally sintered for 2 h at 1200 degrees C; pure HAP isostatic pressed and sintered by a microwave technique for 15 min at temperature of 1200 degrees C. Biocompatibility was compared by enumeration of the number of osteoblast-like cells to the materials before and after hydrogenation. Obtained results show that the osteoblastic cells demonstrated a higher ability to attach to HAP if its surface was negatively charged. Hydrogenation altered the surface potential; HAP substituted with manganese - HAP(Mn) and with magnesium - HAP(Mg) demonstrated the highest ability to engineer the charge.
PB  - IOP Publishing Ltd, Bristol
T2  - Annual Conference on Functional Materials and Nanotechnologies - FM&NT 2011
T1  - The Influence of Surface Treatment by Hydrogenation on the Biocompatibility of Different Hydroxyapatite Materials
VL  - 23
DO  - 10.1088/1757-899X/23/1/012032
ER  - 

@article{
author = "Palcevskis, Eriks and Dindune, Antonija and Dekhtyar, Y. and Polyaka, N. and Veljović, Đorđe and Sammons, R. L.",
year = "2011",
abstract = "The influence of hydrogenation on the biocompatibility of different hydroxyapatite (HAP) materials was tested. Materials consisted of pure HAP, HAP substituted with manganese (Mn+2) and with magnesium (Mg+2) - all axially pressed and conventionally sintered for 2 h at 1200 degrees C; pure HAP isostatic pressed and sintered by a microwave technique for 15 min at temperature of 1200 degrees C. Biocompatibility was compared by enumeration of the number of osteoblast-like cells to the materials before and after hydrogenation. Obtained results show that the osteoblastic cells demonstrated a higher ability to attach to HAP if its surface was negatively charged. Hydrogenation altered the surface potential; HAP substituted with manganese - HAP(Mn) and with magnesium - HAP(Mg) demonstrated the highest ability to engineer the charge.",
publisher = "IOP Publishing Ltd, Bristol",
journal = "Annual Conference on Functional Materials and Nanotechnologies - FM&NT 2011",
title = "The Influence of Surface Treatment by Hydrogenation on the Biocompatibility of Different Hydroxyapatite Materials",
volume = "23",
doi = "10.1088/1757-899X/23/1/012032"
}

Palcevskis, E., Dindune, A., Dekhtyar, Y., Polyaka, N., Veljović, Đ.,& Sammons, R. L.. (2011). The Influence of Surface Treatment by Hydrogenation on the Biocompatibility of Different Hydroxyapatite Materials. in Annual Conference on Functional Materials and Nanotechnologies - FM&NT 2011
IOP Publishing Ltd, Bristol., 23.
https://doi.org/10.1088/1757-899X/23/1/012032

Palcevskis E, Dindune A, Dekhtyar Y, Polyaka N, Veljović Đ, Sammons RL. The Influence of Surface Treatment by Hydrogenation on the Biocompatibility of Different Hydroxyapatite Materials. in Annual Conference on Functional Materials and Nanotechnologies - FM&NT 2011. 2011;23.
doi:10.1088/1757-899X/23/1/012032 .

Palcevskis, Eriks, Dindune, Antonija, Dekhtyar, Y., Polyaka, N., Veljović, Đorđe, Sammons, R. L., "The Influence of Surface Treatment by Hydrogenation on the Biocompatibility of Different Hydroxyapatite Materials" in Annual Conference on Functional Materials and Nanotechnologies - FM&NT 2011, 23 (2011),
https://doi.org/10.1088/1757-899X/23/1/012032 . .

TY  - CONF
AU  - Palcevskis, Eriks
AU  - Dekhtyar, Y.
AU  - Dindune, Antonija
AU  - Kanepe, Z.
AU  - Krastins, J.
AU  - Polyaka, N.
AU  - Veljović, Đorđe
AU  - Sammons, R.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1742
PB  - 24th European Conference on Biomaterials, EBS 2011
C3  - 24th European Conference on Biomaterials - Annual Conference of the European Society for Biomaterial
T1  - Hydrogenated hydroxyapatite materials with improved biocompatibility
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1742
ER  - 

@conference{
author = "Palcevskis, Eriks and Dekhtyar, Y. and Dindune, Antonija and Kanepe, Z. and Krastins, J. and Polyaka, N. and Veljović, Đorđe and Sammons, R.",
year = "2011",
publisher = "24th European Conference on Biomaterials, EBS 2011",
journal = "24th European Conference on Biomaterials - Annual Conference of the European Society for Biomaterial",
title = "Hydrogenated hydroxyapatite materials with improved biocompatibility",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1742"
}

Palcevskis, E., Dekhtyar, Y., Dindune, A., Kanepe, Z., Krastins, J., Polyaka, N., Veljović, Đ.,& Sammons, R.. (2011). Hydrogenated hydroxyapatite materials with improved biocompatibility. in 24th European Conference on Biomaterials - Annual Conference of the European Society for Biomaterial
24th European Conference on Biomaterials, EBS 2011..
https://hdl.handle.net/21.15107/rcub_technorep_1742

Palcevskis E, Dekhtyar Y, Dindune A, Kanepe Z, Krastins J, Polyaka N, Veljović Đ, Sammons R. Hydrogenated hydroxyapatite materials with improved biocompatibility. in 24th European Conference on Biomaterials - Annual Conference of the European Society for Biomaterial. 2011;.
https://hdl.handle.net/21.15107/rcub_technorep_1742 .

Palcevskis, Eriks, Dekhtyar, Y., Dindune, Antonija, Kanepe, Z., Krastins, J., Polyaka, N., Veljović, Đorđe, Sammons, R., "Hydrogenated hydroxyapatite materials with improved biocompatibility" in 24th European Conference on Biomaterials - Annual Conference of the European Society for Biomaterial (2011),
https://hdl.handle.net/21.15107/rcub_technorep_1742 .

TY  - JOUR
AU  - Veljović, Đorđe
AU  - Palcevskis, Eriks
AU  - Dindune, Antonija
AU  - Putić, Slaviša
AU  - Balać, Igor
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1703
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, Eriks and Dindune, Antonija and Putić, Slaviša and Balać, Igor and Petrović, Rada 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, Eriks, Dindune, Antonija, Putić, Slaviša, Balać, Igor, Petrović, Rada, 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 . .

TY  - JOUR
AU  - Veljović, Đorđe
AU  - Jokić, Bojan
AU  - Petrović, Rada
AU  - Palcevskis, Eriks
AU  - Dindune, Antonija
AU  - Mihailescu, Ion N.
AU  - Janaćković, Đorđe
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1504
AB  - A nanosized HAP powder was sintered and hot pressed, in order to obtain dense HAP ceramics. In a first series of experiments, the powder was isostatically pressed into uniform green compacts and sintered at temperatures ranging from 1000 degrees C to 1200 degrees C in air atmosphere for different times. In a second series, the isostatically pressed green compacts were hot pressed in argon atmosphere at 900 degrees C, 950 degrees C and 1000 degrees C. The SEM micrograph of the sample sintered at 1200 degrees C for 2 h showed a uniform 3 mu m mean grain size dense microstructure. In the case of hot pressed HAP compacts, full dense, translucent nanostructures were obtained having mean grain size below 100 nm and improved mechanical properties. With the grain size decreasing from 3 mu m to 50 nm, the fracture toughness of pure HAP ceramics increased from 0.28 MPa m(1/2) to 1.52 MPa m(1/2).
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Processing of dense nanostructured HAP ceramics by sintering and hot pressing
EP  - 1413
IS  - 4
SP  - 1407
VL  - 35
DO  - 10.1016/j.ceramint.2008.07.007
ER  - 

@article{
author = "Veljović, Đorđe and Jokić, Bojan and Petrović, Rada and Palcevskis, Eriks and Dindune, Antonija and Mihailescu, Ion N. and Janaćković, Đorđe",
year = "2009",
abstract = "A nanosized HAP powder was sintered and hot pressed, in order to obtain dense HAP ceramics. In a first series of experiments, the powder was isostatically pressed into uniform green compacts and sintered at temperatures ranging from 1000 degrees C to 1200 degrees C in air atmosphere for different times. In a second series, the isostatically pressed green compacts were hot pressed in argon atmosphere at 900 degrees C, 950 degrees C and 1000 degrees C. The SEM micrograph of the sample sintered at 1200 degrees C for 2 h showed a uniform 3 mu m mean grain size dense microstructure. In the case of hot pressed HAP compacts, full dense, translucent nanostructures were obtained having mean grain size below 100 nm and improved mechanical properties. With the grain size decreasing from 3 mu m to 50 nm, the fracture toughness of pure HAP ceramics increased from 0.28 MPa m(1/2) to 1.52 MPa m(1/2).",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Processing of dense nanostructured HAP ceramics by sintering and hot pressing",
pages = "1413-1407",
number = "4",
volume = "35",
doi = "10.1016/j.ceramint.2008.07.007"
}

Veljović, Đ., Jokić, B., Petrović, R., Palcevskis, E., Dindune, A., Mihailescu, I. N.,& Janaćković, Đ.. (2009). Processing of dense nanostructured HAP ceramics by sintering and hot pressing. in Ceramics International
Elsevier Sci Ltd, Oxford., 35(4), 1407-1413.
https://doi.org/10.1016/j.ceramint.2008.07.007

Veljović Đ, Jokić B, Petrović R, Palcevskis E, Dindune A, Mihailescu IN, Janaćković Đ. Processing of dense nanostructured HAP ceramics by sintering and hot pressing. in Ceramics International. 2009;35(4):1407-1413.
doi:10.1016/j.ceramint.2008.07.007 .

Veljović, Đorđe, Jokić, Bojan, Petrović, Rada, Palcevskis, Eriks, Dindune, Antonija, Mihailescu, Ion N., Janaćković, Đorđe, "Processing of dense nanostructured HAP ceramics by sintering and hot pressing" in Ceramics International, 35, no. 4 (2009):1407-1413,
https://doi.org/10.1016/j.ceramint.2008.07.007 . .

TY  - JOUR
AU  - Gyorgy, E.
AU  - Grigorescu, S.
AU  - Socol, Gabriel
AU  - Mihailescu, Ion N.
AU  - Janaćković, Đorđe
AU  - Dindune, Antonija
AU  - Kanepe, Z.
AU  - Palcevskis, Eriks
AU  - Zdrentu, E. L.
AU  - Petrescu, S. M.
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1170
AB  - Bioactive glass (BG), calcium hydroxyapatite (HA), and ZrO2 doped HA thin films were grown by pulsed laser deposition on Ti substrates. An UV KrF* (lambda = 248 nm, tau  gt = 7 ns) excimer laser was used for the multi-pulse irradiation of the targets. The substrates were kept at room temperature or heated during the film deposition at values within the (400-550 degrees C) range. The depositions were performed in oxygen and water vapor atmospheres, at pressure values in the range (5-40 Pa). The HA coatings were heat post-treated for 6 h in a flux of hot water vapors at the same temperature as applied during deposition. The surface morphology, chemical composition, and crystalline quality of the obtained thin films were studied by scanning electron microscopy, atomic force microscopy, and X-ray diffractometry. The films were seeded for in vitro tests with Hek293 (human embryonic kidney) cells that revealed a good adherence on the deposited layers. Biocompatibility tests showed that cell growth was better on HA than on BG thin films.
PB  - Elsevier, Amsterdam
T2  - Applied Surface Science
T1  - Bioactive glass and hydroxyapatite thin films obtained by pulsed laser deposition
EP  - 7986
IS  - 19
SP  - 7981
VL  - 253
DO  - 10.1016/j.apsusc.2007.02.146
ER  - 

@article{
author = "Gyorgy, E. and Grigorescu, S. and Socol, Gabriel and Mihailescu, Ion N. and Janaćković, Đorđe and Dindune, Antonija and Kanepe, Z. and Palcevskis, Eriks and Zdrentu, E. L. and Petrescu, S. M.",
year = "2007",
abstract = "Bioactive glass (BG), calcium hydroxyapatite (HA), and ZrO2 doped HA thin films were grown by pulsed laser deposition on Ti substrates. An UV KrF* (lambda = 248 nm, tau  gt = 7 ns) excimer laser was used for the multi-pulse irradiation of the targets. The substrates were kept at room temperature or heated during the film deposition at values within the (400-550 degrees C) range. The depositions were performed in oxygen and water vapor atmospheres, at pressure values in the range (5-40 Pa). The HA coatings were heat post-treated for 6 h in a flux of hot water vapors at the same temperature as applied during deposition. The surface morphology, chemical composition, and crystalline quality of the obtained thin films were studied by scanning electron microscopy, atomic force microscopy, and X-ray diffractometry. The films were seeded for in vitro tests with Hek293 (human embryonic kidney) cells that revealed a good adherence on the deposited layers. Biocompatibility tests showed that cell growth was better on HA than on BG thin films.",
publisher = "Elsevier, Amsterdam",
journal = "Applied Surface Science",
title = "Bioactive glass and hydroxyapatite thin films obtained by pulsed laser deposition",
pages = "7986-7981",
number = "19",
volume = "253",
doi = "10.1016/j.apsusc.2007.02.146"
}

Gyorgy, E., Grigorescu, S., Socol, G., Mihailescu, I. N., Janaćković, Đ., Dindune, A., Kanepe, Z., Palcevskis, E., Zdrentu, E. L.,& Petrescu, S. M.. (2007). Bioactive glass and hydroxyapatite thin films obtained by pulsed laser deposition. in Applied Surface Science
Elsevier, Amsterdam., 253(19), 7981-7986.
https://doi.org/10.1016/j.apsusc.2007.02.146

Gyorgy E, Grigorescu S, Socol G, Mihailescu IN, Janaćković Đ, Dindune A, Kanepe Z, Palcevskis E, Zdrentu EL, Petrescu SM. Bioactive glass and hydroxyapatite thin films obtained by pulsed laser deposition. in Applied Surface Science. 2007;253(19):7981-7986.
doi:10.1016/j.apsusc.2007.02.146 .

Gyorgy, E., Grigorescu, S., Socol, Gabriel, Mihailescu, Ion N., Janaćković, Đorđe, Dindune, Antonija, Kanepe, Z., Palcevskis, Eriks, Zdrentu, E. L., Petrescu, S. M., "Bioactive glass and hydroxyapatite thin films obtained by pulsed laser deposition" in Applied Surface Science, 253, no. 19 (2007):7981-7986,
https://doi.org/10.1016/j.apsusc.2007.02.146 . .