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Dissolution of calcium-deficient hydroxyapatite synthesized at different conditions

The dissolution characteristics of several calcium-deficient hydroxyapatites (HA) have been investigated. Eleven samples were produced by varying synthesis parameters like temperature, pH, digestion time, reagent concentration and velocity of addition. Powder characterization was conducted using X-r...

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Bibliographic Details
Published in:Materials characterization 2003-03, Vol.50 (2), p.203-207
Main Authors: Mavropoulos, Elena, Rossi, Alexandre M., da Rocha, Nilce C.C., Soares, Gloria A., Moreira, Josino C., Moure, Gustavo T.
Format: Article
Language:English
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Summary:The dissolution characteristics of several calcium-deficient hydroxyapatites (HA) have been investigated. Eleven samples were produced by varying synthesis parameters like temperature, pH, digestion time, reagent concentration and velocity of addition. Powder characterization was conducted using X-ray diffraction. Sample crystallinity was variable and samples examined by transmission electron microscopy showed acicular or plate-like morphology. After sample dissolution in Milli-Q water for 168 h, the calcium and phosphate contents in solution were measured by induced coupled plasma optical emission spectrometry (OES). The dissolution behavior of calcium-deficient HA was highly dependent on the sample calcium/phosphorus (Ca/P) molar ratio of the original HA. Dissolution in water was enhanced with decreasing HA sample molar ratio. However, the dissolution process equilibrium was not achieved at the end of 168 h (7 days).
ISSN:1044-5803
1873-4189
DOI:10.1016/S1044-5803(03)00093-7