Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates
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2003
Authors
Janaćković, Đorđe
Janković, Ivona

Petrović, R
Kostić-Gvozdenović, L.
Milonjić, Slobodan
Uskoković, Dragan

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In this paper surface properties of calcium-hydroxyapatite, synthesized by modified hydrothermal reaction of urea and Ca(EDTA)(2-) in phosphate solutions, as well as the dependence of calcium hydroxyapatite dispersion stability on pH were determined. The specific surface area of calcium-hydroxyapatite was experimentally found to be 67 m(2)/g. The point of zero charge (PZC) of indifferent KCl electrolyte of 6.8 +/- 0.1 was determined by the batch equilibration method. From the dependence of surface charge density on pH and electrolyte concentration, the intrinsic equilibrium constant of surface groups p K-a2(int) was determined to be 8.3 +/- 0.1, while p K-a1(int) calculated from the pK(a2)(int) and point of zero charge values, is 5.3 +/- 0.1. Hydroxyapatite suspension stability was investigated, in the pH range from 7 to 12, it was revealed that the most stable dispersion at pH 10.
Keywords:
hydroxyapatite / surface properties / hydrothermal decomposition / urea / calcium-EDTA chelatesSource:
15th International Symposium on Ceramics in Medicine, Dec 04-08, 2002, Univ Technol, Sydney, Australia, 2003, 437-440Note:
- Key Engineering Materials, Volumes 240-242
DOI: 10.4028/www.scientific.net/KEM.240-242.437
ISSN: 1013-9826 (print)
WoS: 000182706600098
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Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - CONF AU - Janaćković, Đorđe AU - Janković, Ivona AU - Petrović, R AU - Kostić-Gvozdenović, L. AU - Milonjić, Slobodan AU - Uskoković, Dragan PY - 2003 UR - https://dais.sanu.ac.rs/123456789/3285 AB - In this paper surface properties of calcium-hydroxyapatite, synthesized by modified hydrothermal reaction of urea and Ca(EDTA)(2-) in phosphate solutions, as well as the dependence of calcium hydroxyapatite dispersion stability on pH were determined. The specific surface area of calcium-hydroxyapatite was experimentally found to be 67 m(2)/g. The point of zero charge (PZC) of indifferent KCl electrolyte of 6.8 +/- 0.1 was determined by the batch equilibration method. From the dependence of surface charge density on pH and electrolyte concentration, the intrinsic equilibrium constant of surface groups p K-a2(int) was determined to be 8.3 +/- 0.1, while p K-a1(int) calculated from the pK(a2)(int) and point of zero charge values, is 5.3 +/- 0.1. Hydroxyapatite suspension stability was investigated, in the pH range from 7 to 12, it was revealed that the most stable dispersion at pH 10. C3 - 15th International Symposium on Ceramics in Medicine, Dec 04-08, 2002, Univ Technol, Sydney, Australia T1 - Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates SP - 437 EP - 440 DO - 10.4028/www.scientific.net/KEM.240-242.437 UR - https://hdl.handle.net/21.15107/rcub_dais_3285 ER -
@conference{ author = "Janaćković, Đorđe and Janković, Ivona and Petrović, R and Kostić-Gvozdenović, L. and Milonjić, Slobodan and Uskoković, Dragan", year = "2003", abstract = "In this paper surface properties of calcium-hydroxyapatite, synthesized by modified hydrothermal reaction of urea and Ca(EDTA)(2-) in phosphate solutions, as well as the dependence of calcium hydroxyapatite dispersion stability on pH were determined. The specific surface area of calcium-hydroxyapatite was experimentally found to be 67 m(2)/g. The point of zero charge (PZC) of indifferent KCl electrolyte of 6.8 +/- 0.1 was determined by the batch equilibration method. From the dependence of surface charge density on pH and electrolyte concentration, the intrinsic equilibrium constant of surface groups p K-a2(int) was determined to be 8.3 +/- 0.1, while p K-a1(int) calculated from the pK(a2)(int) and point of zero charge values, is 5.3 +/- 0.1. Hydroxyapatite suspension stability was investigated, in the pH range from 7 to 12, it was revealed that the most stable dispersion at pH 10.", journal = "15th International Symposium on Ceramics in Medicine, Dec 04-08, 2002, Univ Technol, Sydney, Australia", title = "Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates", pages = "437-440", doi = "10.4028/www.scientific.net/KEM.240-242.437", url = "https://hdl.handle.net/21.15107/rcub_dais_3285" }
Janaćković, Đ., Janković, I., Petrović, R., Kostić-Gvozdenović, L., Milonjić, S.,& Uskoković, D.. (2003). Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates. in 15th International Symposium on Ceramics in Medicine, Dec 04-08, 2002, Univ Technol, Sydney, Australia, 437-440. https://doi.org/10.4028/www.scientific.net/KEM.240-242.437 https://hdl.handle.net/21.15107/rcub_dais_3285
Janaćković Đ, Janković I, Petrović R, Kostić-Gvozdenović L, Milonjić S, Uskoković D. Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates. in 15th International Symposium on Ceramics in Medicine, Dec 04-08, 2002, Univ Technol, Sydney, Australia. 2003;:437-440. doi:10.4028/www.scientific.net/KEM.240-242.437 https://hdl.handle.net/21.15107/rcub_dais_3285 .
Janaćković, Đorđe, Janković, Ivona, Petrović, R, Kostić-Gvozdenović, L., Milonjić, Slobodan, Uskoković, Dragan, "Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates" in 15th International Symposium on Ceramics in Medicine, Dec 04-08, 2002, Univ Technol, Sydney, Australia (2003):437-440, https://doi.org/10.4028/www.scientific.net/KEM.240-242.437 ., https://hdl.handle.net/21.15107/rcub_dais_3285 .