Coating ofhydroxyapatite on titanium plates using thermal dissociation of calcium-edta chelate complex in phosphate solutions under hydrothermal conditions

Yoshinobu Fujishiro, Akitoshi Fujimoto, Tsugio Sato, Akitsugu Okuwaki

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Hydroxyapatite films were formed on the surfaces of titanium plates by the homogeneous precipitation technique using hydrothermal reactions in Ca(edta)2−-NaH2PO4 solution at 120-200°C and pH 4.0-10.0 for 2-20 h. When titanium plates were directly treated in 0.05 M Ca(edta)2−-0.05 M NaH2PO4 solutions at160°C for 2 h, they were uniformly coated with the films that consisted of mixtures of large plate-like monetite particles and fine needle-like hydroxyapatite particles at pH 5, whereas aggregates consisting of needle-like and/or rod-like hydroxyapatite and plate-like monetite were deposited on the surface as islands above pH 6 and at pH 4, respectively. The plate-like monetite formed in the initial stage of the reaction at pH 5.0 was converted to needle-like hydroxyapatite with time due to increasing solution pH above 5.5. Double-coating, in which titanium plates were successively treated in 0.05 M Ca(edta)2−-0.05 M NaH2PO4solution at pH 5.5 and 160°C for 2 h, to coat the surface entirely with a thin film consisting of monetite and hydroxyapatite, and in 0.05 MCa(edta)2− -0.05 M NaH2PO4 solution at pH 6-9 and 160°C, was useful to promote the formation of hydroxyapatite coating.

Original languageEnglish
Pages (from-to)119-127
Number of pages9
JournalJournal of Colloid And Interface Science
Volume173
Issue number1
DOIs
Publication statusPublished - 1995 Jul

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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