Abstract
Abstract Rehydration of silica gels sintered at 900–1100°C can stimulate apatite crystallization from a metastable calcium phosphate solution on their surfaces. This precipitation reaction is related to the thermal history of the silica. Increasing sintering temperature can retard apatite formation on the silica gel. Sintering at 1200°C can make the silica gel insoluble and thereby unable to induce apatite crystallization. It is believed that apatite crystallization on the silica can be modulated by the rate of hydrolysis on its surface. Certain coverage of silanol group is required to trigger heterogeneous nucleation of apatite from the metastable calcium phosphate solution.
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