在磷酸钠碱性电解质中对单晶硅(100)进行阳极氧化处理,并将阳极氧化处理后的样品在模拟体液(simulated body fluid,SBF)中浸泡以考察其体外诱导骨状磷灰石沉积能力。用扫描电子显微镜观测体外浸泡前后样品的表面形貌,用电子能谱仪和X射线衍射仪研究阳极氧化后与体外浸泡不同时间后样品表面的成分。结果表明:单晶硅在10%的磷酸钠电解质中于5～20mA/cm2阳极氧化后,其表面原位形成火山口状结构,在SBF中浸泡1d后有磷灰石在单晶硅的阳极氧化层表面成核,浸泡6d后诱导形成了纳米骨状缺钙磷灰石层,体现出良好的体外诱导活性,表明阳极氧化处理是一种有希望应用于改善生物学与医学用单晶硅表面生物相容性的有效途径。
Perovskite ZnTiO3 was prepared through a new method which contained a hydrothermal process for the preparation of titanate nanotubes and an ion-exchange process.The titanate nanotubes were inferred to be H2Ti3O7·3H2O.X-ray diffraction（XRD）result revealed the presence of cubic perovskite phase of ZnTiO3.The unique chain-like morphology of ZnTiO3 was observed by scanning electron microscopy（SEM） and transmission electron microscopy（TEM）.UV-Vis diffusive reflection spectra of ZnTiO3indicated that the absorbance obviously increased in the visible light region.The degradation rate of methyl orange solution（15 mg/L）reached 95.3%over ZnTiO3（0.3 g/L） after 20 min xenon light irradiation,which was higher than that using the commercial catalyst P25 under the same reaction condition.The degradation kinetic results follow the first-order equation and the rate constant is 0.1020.
