The uptake of titanium ions by hydroxyapatite particles-structural changes and possible mechanisms

C. C. Ribeiro, Iain Ronald Gibson, M. A. Barbosa

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Abstract

In order to understand the effect of titanium ions oil the molecular structure of hydroxyapatite (HAp), HAp powders were incubated in solutions with different titanium concentrations. After incubation, the powders obtained were analysed using different techniques, namely X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), X-ray photoelectron spectroscopy (XPS), and energy dispersive spectroscopy (EDS). The results suggest that, depending on the concentration of titanium in solution, two different mechanisms of interaction with HAp occur. For concentrations equal to or smaller than 200 ppm, the titanium uptake by the solid seems to be primarily due to incorporation in the lattice. For higher concentrations, a dissolution-precipitation process seems to occur, leading to formation of a titanium phosphate compound. (C) 2005 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1749-1761
Number of pages12
JournalBiomaterials
Volume27
Issue number9
DOIs
Publication statusPublished - Mar 2006

Keywords

  • hydroxyapatite
  • titanium
  • titanium phosphate
  • TRANSFORM INFRARED-SPECTROSCOPY
  • CALCIUM-PHOSPHATE
  • SUBSTITUTED HYDROXYAPATITE
  • BARIUM HYDROXYAPATITES
  • OCTACALCIUM PHOSPHATE
  • STRUCTURE REFINEMENTS
  • LEAD IMMOBILIZATION
  • SYNTHETIC APATITES
  • EARLY DEPOSITS
  • SOLID-PHASE

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