镍钛合金表面含银二氧化钛薄膜的水热制备与性能  

Hydrothermal Preparation and Properties of Ag-containing TiO_2 Film on NiTi Alloy

作　　者：王宇宁[1] 杨水云[1] 孙见敏 赵军超[1] Alajmi Zafer 付涛[1] 

机构地区：[1]西安交通大学生命科学与技术学院,西安710049

出　　处：《生物医学工程研究》2014年第2期108-112,共5页Journal Of Biomedical Engineering Research

基　　金：国家自然科学基金资助项目(50901058);中央高校基本科研业务费专项资金(xjj2011096)资助项目

摘　　要：采用硝酸银溶液对镍钛合金进行水热处理，表面形成了尺寸60～90 nm颗粒的薄膜，分布有约90 nm的含银颗粒。X射线衍射检测到锐钛矿型二氧化钛和单质银的弱衍射峰。X射线光电子能谱分析表明，水热处理形成的二氧化钛薄膜基本覆盖住了镍钛基体，Ag元素以金属态存在。含银二氧化钛薄膜具有较好的紫外光致亲水性。在无钙Hank’s平衡盐液中的动电位极化实验表明，水热处理试样的耐蚀性高于抛光试样，但银的掺入造成阳极极化电流的波动。抛光镍钛试样对葡萄球菌没有抑菌作用，而水热处理试样在暗环境下具有抑菌功能，周围形成了平均宽度约1．2 mm的抑菌圈。When NiTi alloy was hydrothermally treated in AgNO3 solution,a film with particles of 60~90 nm in size was formed on the surface,and there are Ag-containing particles （about 90 nm）on the film.In X-ray diffraction,weak diffraction peaks of an-atase TiO2 and pure silver were detected.X-ray photoelectron spectroscopy analysis showed that the hydrothermally grown TiO2 film nearly covered the NiTi substrate,and Ag existed in the metallic state.The Ag-TiO2 film had good UV light-induced hydrophilicity. The potentiodynamic polarization test in a Ca-free Hank′s balanced salt solution showed that the hydrothermally treated sample had better corrosion resistance than the polished one,but Ag doping leaded to the change of the anodic polarization current.The polished NiTi sample has no inhibitory effect on Staphylococcus aureus,but the hydrothermally treated sample has antibacterial property in dark-ness,forming an inhibition zone with the average width of ~1 .2 mm.

关 键 词：镍钛合金 水热 二氧化钛 耐蚀性 抗菌 

分 类 号：R318.08[医药卫生—生物医学工程]