期刊
ACTA BIOMATERIALIA
卷 5, 期 5, 页码 1678-1685出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2008.11.032
关键词
Solid titration; Solubility; Strontium-substituted apatite; Hydroxyapatite
资金
- Hong Kong ITF [GHP/009/06]
- HKRGC [HKU7147/07E]
Solid titration was used to explore the solubility isotherms of partially (Srx-HAp, x = 1, 5, 10, 40, 60 mol.%) and fully substituted hydroxyapatite (Sr-HAp). Solubility increased with increasing strontium content. No phase other than strontium-substituted HAp, corresponding to the original titrant, was detected in the solid present at equilibrium; in particular, dicalcium hydrogen phosphate was not detected at low pH. The increase in solubility with strontium content is interpreted as a destabilization of the crystal structure by the larger strontium ion. Carbonated HAp was formed in simulated body fluid containing carbonate on seeding with Sr10-HAp, but the precipitate was strontium-substituted on seeding with Sr-HAp. Strontium-substituted HAp might be usable as a template for the growth of bone, since nucleation appears to be facilitated. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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