利用碱热法处理钛表面,部分样品加热到450和700℃进行热处理,获得不同形貌和不同晶型的TiO2薄膜.实验得出,未经热处理的样品表面以非晶态钛凝胶层为主,450℃热处理样品主要以锐钛矿相TiO2存在,700℃热处理样品主要以金红石相TiO2出现.700℃热处理后的样品表面分布有大量50nm左右的纳米颗粒,这些纳米粒子的尺寸效应能较好地诱导HA在样品表面沉积形成,提高细胞的黏附和增殖,因此表现出较高的生物活性.450℃热处理后的样品表面相对于未处理样品有更多的HA沉积,是因为表面层的晶型起了主要作用,即锐钛矿TiO2晶体比无定型凝胶态TiO2更利于诱导HA沉积.但相对于未经任何处理的空白样品,仅用NaOH处理后的样品表面较利于HA沉积,可能是碱处理后钛表面羟基增加,进而提高了其诱导HA沉积的能力.
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