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采用溶胶 -凝胶法在医用NiTi形状记忆合金表面制备了TiO2 与TiO2 -SiO2 薄膜 .用X射线 (XRD) ,红外光谱 (FT -IR) ,X射线光电子能谱 (XPS)和原子力显微镜 (AFM)对薄膜的表面组成、结构与形貌进行了研究 .将表面涂有薄膜的试样浸入模拟体液 (SBF) ,用XPS分析Ca ,P在薄膜表面的沉积情况 .结果表明 :TiO2 -SiO2 膜具有比TiO2 膜更高的生物活性 ,主要原因是TiO2 -SiO2 薄膜表面存在较多的羟基基团 ,在模拟体液中诱导磷灰石沉积的能力较高 ;此外 ,薄膜的表面形貌对其生物活性也有一定的影响
TiO2 and TiO2-SiO2 films were prepared on the surface of medical NiTi shape memory alloy by sol-gel method. XRD, X-ray photoelectron spectroscopy (XPS) and atomic force microscope The surface composition, structure and morphology of the films were studied.The samples coated with thin films were immersed in simulated body fluid (SBF), and the deposition of Ca and P on the thin films was analyzed by XPS.The results showed that TiO2-SiO2 films Has higher biological activity than TiO2 film, mainly due to the presence of more hydroxyl groups on the surface of TiO2-SiO2 film and higher ability of inducing apatite deposition in simulated body fluids. In addition, Activity also has a certain impact