采用电化学阳极氧化法在钛金属表面制备了具有不同管径尺寸的TiO2纳米管阵列(TiO2nano tube array,TNT)涂层.实验中通过模拟体液(simulated body fluid,SBF)浸泡法制备了纳米羟基磷灰石(nanohydroxyapatite,nHA)/TNT复合涂层,并研究了nHA在纳米管表面生成的过程和机理.Ti--OH基团是HA在TNT表面成核的诱因,TiO2与HA晶体构成的晶格匹配结构能够促进HA的成核速率,锐钛矿和金红石混合相的TNT涂层诱导nHA生成的能力明显强于无定型的TNT涂层.涂层的润湿性受控于纳米管的管径尺寸,并能够影响nHA形成的速率,增强纳米管的亲水性有利于HA的沉积.
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