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.
TY - JOUR
AU - Janaćković, Đorđe
AU - Janković, Ivana A.
AU - Petrović, R.
AU - Kostić-Gvozdenović, Ljiljana
AU - Milonjić, Slobodan K.
AU - Uskoković, Dragan
PY - 2003
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/507
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.
PB - Proceedings of the 15th International Symposium on Ceramics in Medicine; The Annual Meeting of the International Society for Ceramics in Medicine
T2 - Key Engineering Materials
T1 - Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates
EP - 440
SP - 437
VL - 240-242
UR - https://hdl.handle.net/21.15107/rcub_technorep_507
ER -
@article{
author = "Janaćković, Đorđe and Janković, Ivana A. and Petrović, R. and Kostić-Gvozdenović, Ljiljana and Milonjić, Slobodan K. 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.",
publisher = "Proceedings of the 15th International Symposium on Ceramics in Medicine; The Annual Meeting of the International Society for Ceramics in Medicine",
journal = "Key Engineering Materials",
title = "Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates",
pages = "440-437",
volume = "240-242",
url = "https://hdl.handle.net/21.15107/rcub_technorep_507"
}
Janaćković, Đ., Janković, I. A., Petrović, R., Kostić-Gvozdenović, L., Milonjić, S. K.,& Uskoković, D.. (2003). Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates. in Key Engineering Materials
Proceedings of the 15th International Symposium on Ceramics in Medicine; The Annual Meeting of the International Society for Ceramics in Medicine., 240-242, 437-440.
https://hdl.handle.net/21.15107/rcub_technorep_507
Janaćković Đ, Janković IA, Petrović R, Kostić-Gvozdenović L, Milonjić SK, Uskoković D. Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates. in Key Engineering Materials. 2003;240-242:437-440.
https://hdl.handle.net/21.15107/rcub_technorep_507 .
Janaćković, Đorđe, Janković, Ivana A., Petrović, R., Kostić-Gvozdenović, Ljiljana, Milonjić, Slobodan K., Uskoković, Dragan, "Surface properties of HAP particles obtained by hydrothermal decomposition of urea and calcium-EDTA chelates" in Key Engineering Materials, 240-242 (2003):437-440,
https://hdl.handle.net/21.15107/rcub_technorep_507 .
