钛及其合金具有较好的生物相容性、耐腐蚀性和优异的力学性能,已广泛用作人体硬组织种植材料,并成功应用于骨、牙齿及整形外科等领域.近年来,通过阳极氧化法在钛表面构筑具有生物活性TiO2纳米管阵列的研究备受关注.在水热条件下,以TiO2纳米管阵列于饱和Ca(OH)2和0.01mol/L Na2HPO4溶液中诱导沉积羟基磷灰石(HAp)涂层,并采用SEM、XRD、HR-TEM、Raman等进行表征.结果表明,TiO2纳米管阵列在适宜的水热条件下,所沉积的HAp涂层呈现特殊双层结构,底层为短棒状呈"十字"交叉排列,上层为长棒状结构.体外生物矿化实验表明,TiO2纳米管阵列诱导水热沉积HAp涂层后可大大提高其生物活性.该方法具有设备简单、易于操作、温度低等优点,有利于在骨、关节及牙齿等硬组织植入物生物活化改性方面的推广应用.
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