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In order to obtain a fast biomimetic coating on titanium substrates, calcium enriched silica films were prepared on pure titanium substrates by sol-gel method under the following conditions: pH = 3 and the molar ratio of tetraethyl orthosilicate (TEOS)/H2O/EtOH/Ca2+ = 1∶4∶11∶0·08. The titanium base calcium enriched silica film is soaked in a slightly supersaturated Ca/P solution, with the concentration of calcium ion and phosphate group being 1·5 times of that of simulated body fluid, for seven days, a uniform apatite layer is precipitated onto the surfaces of calcium enriched silica films, which is quite rapidly. The investigation adopted SEM, EDX, Fourier transform infrared spectroscope and XRD to indicate that the coating was carbonate hydroxyapatite. The results show that it is a feasible way to obtain carbonate hydroxyapatite through functionalising the pure titanium substrates by preparing calcium enriched silica films on it from a sol-gel method. [ABSTRACT FROM AUTHOR]

Embedded-style hydroxyapatite-titania nanotube arrays were successfully prepared by anodic oxidation of titanium substrate and centrifugal filling hydroxyapatite precursor sol into hollow nanotubes. The morphology, microstructure and thermal stability of the samples were characterized by X-ray diffraction, environmental scanning electron microscopy, and energy dispersive X-ray analysis. The results show that the structure of titania nanotube arrays is stable at 500 °C or below, and the crystallized hydroxyapatite could be formed from hydroxyapatite precursor sol after calcining at 500 °C for 4 h. The optimum calcining temperature for this material is 500 °C. An obvious apatite layer formed on the surface of the embedded-style material after soaking in simulated body fluid for 5 days, indicating that the material possesses a good in vitro apatite forming ability on its surface. [ABSTRACT FROM AUTHOR]