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Mechanisms of hydroxyapatite formation on porous gel-silica substrates

✍ Scribed by Marivalda M. Pereira; Larry L. Hench

Publisher
Springer
Year
1996
Tongue
English
Weight
917 KB
Volume
7
Category
Article
ISSN
0928-0707

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✦ Synopsis

The variables affecting the nucleation and crystallization of biological hydroxy carbonate apatite (HCA) on porous gel-silica substrates are examined. Texture is the critical variable with the rate of HCA formation increasing as pore size and pore volume increase, with pore sizes >2 nm required to achieve rapid kinetics (4-6 days) of fully crystallized HCA. The concentration of silanol groups on the silica surface does not control the rate of HCA formation although metastable surface defects, such as trisiloxane rings, may be involved in HCA nucleation.

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