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Effect of trisodium citrate on electrolytic deposition of hydroxyapatite coatings.

Authors
  • Lin, Dong-Yang
  • Wang, Xiao-Xiang
  • Jiang, Yong
Type
Published Article
Journal
Journal of Biomedical Materials Research Part B Applied Biomaterials
Publisher
Wiley (John Wiley & Sons)
Publication Date
Jan 01, 2011
Volume
96
Issue
1
Pages
1–8
Identifiers
DOI: 10.1002/jbm.b.31749
PMID: 21086428
Source
Medline
License
Unknown

Abstract

Hydroxyapatite coatings were deposited on the titanium substrate by using various content Na₃Cit as an organic modifier in electrolytes. The influence of the Na₃Cit on the sizes of the HA crystals during electrolytic deposition was investigated under different molar ratio of Na₃Cit to calcium ions. The experimental results showed that the size of HA crystal was well controlled by the addition of Na₃Cit. When the molar ratio of Na₃Cit to calcium ions was equal or greater than five, the obtained HA coating consisted of nanosized crystals. The HA nanoparticles were precipitated without a precursor phase when the molar ratio of Na₃Cit to calcium ions was five; otherwise, the CaP coating experienced a phase conversion from octacalcium phosphate (OCP) to HA during the ELD. The effect of pH on saturation indexes with respect to hydroxyapatite, OCP, and dicalcium dihydrogen phosphate of these electrolytes was calculated by a computer program PHREEQC. The calculation showed the nucleation of OCP as the precursor during the deposition could be inhibited with increasing Na₃Cit content in the electrolytes.

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