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In order to form the apatite nuclei on a surface of the substrate, the substrate was placed on or in CaO, SiO2-based glass particles which were soaked in a simulated body fluid with ion concentrations nearly e-qual to those of human blood plasma, and to make the apatite nuclei grow on the substrate in situ, the substrate, was soaked in another solution highly supersaturated with respect to the apatite. The induction period for the apatite nucleation varied from 0 to 4 days depending on the kind of the substrate. The thickness of the apatite layer increases linearly with increasing soaking time in the second solution. The rate of growth of the apatite layer increases with increasing degree of the supersaturation and temperature of the second solution, reaching 7um/d in a solution with ion concentrations which is as 1.5 times as those of the simulated body fluid at 60℃. The adhesive strength of the apatite layer to the substrate varies depending on the kind and roughness of the substrate. Polyethyleneterephth
In order to form the apatite nuclei on a surface of the substrate, the substrate was placed on or in CaO, SiO2-based glass particles which were soaked in a simulated body fluid with ion concentrations nearly e-qual to those of human blood plasma, and to make the apatite nuclei grow on the substrate in situ, the substrate, was soaked in another solution highly supersaturated with respect to the apatite. The induction period for the apatite nucleation varied from 0 to 4 days depending on the kind of the substrate. The thickness of the apatite layer increases linearly with increasing soaking time in the second solution. The rate of growth of the apatite layer increases with increasing degree of the supersaturation and temperature of the second solution, reaching 7um / d in a solution with ion concentrations which is as 1.5 times as those of the simulated body fluid at 60 ° C. The adhesive strength of the apatite layer to the substrate varies depending on the kind and roughness of the substra te. Polyethyleneterephth