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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

Ribeiro, CC (Autor) Outra; Gibson, I (Autor) Outra; Mário Adolfo Barbosa (Autor) FEUP

Revista

Título: Biomaterials

Vol. 27 Nº 31

Páginas: 1749-1761

ISSN: 0142-9612

Editora: Elsevier

Indexação

ISI Web of Knowledge - 75 Citações

Scopus - 77 Citações

Outras Informações

ID Authenticus: P-004-MVT

DOI: 10.1016/j.biomaterials.2005.09.043

Abstract (EN): 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13