PRECIPITATION OF HYDROXYAPATITE FILM UNDER DYNAMIC CONDITIONS

摘要

Hydroxyapatite was synthesized by reacting Ca(HCO_3)_2 with (NH)_2HPO_4 at 25 C. It was demonstrated that, for the crystallization of hydroxyapatite on a substrate as a coating, it is important to suppress the homogeneous nucleation in the bulk volume of the precursor solution. Heterogeneous nucleation on a sol-gel derived SiO_2 surface was advantageous for the deposition of film on a substrate under dynamic conditions. This approach led to the formation of a homogeneous, transparent coating (～ l um) of hydroxyapatite on the sol-gel derived SiO_2 surface on the glass.