Abstract
Bioactive CaTiO3 nanobricks were synthesized using a two-step anodization–hydrothermal treatment. TiO2 nanotubes (TNTs) on the Ti substrate surface were first prepared by anodization in a glycerol electrolyte with 0.5% NH4F. Two percent H2O in the electrolyte was required to obtain highly ordered TNTs; the regularity of TNTs was indispensible for further formation of CaTiO3 nanostructures. The TNTs were then hydrothermally treated in saturated Ca(OH)2 solution at 150°C for 12h. The TNTs were transformed to crystalline CaTiO3 nanobricks of width 45–75nm and length 125–275nm. A transformation mechanism was proposed based on a combination of dissolution–precipitation and Ostwald ripening. The bioactivity of the CaTiO3 nanobricks was evaluated using simulated body fluid immersion tests. A hydroxyapatite layer with high coverage was formed within 7days, showing the potential for biomedical applications.
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