Preparation, characterization, corrosion behavior and bioactivity of Ni₂O₃-doped TiO₂ nanotubes on NiTi alloy

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• 作者：Ruiqiang Hang ; Xiaobo Huang ; Linhai Tian ; Zhiyong He ; Bin Tang ; ^{tangbin@tyut.edu.cn} ; ^{tangbin6405@sina.com}
• 关键词：Corrosion ; Bioactivity ; Nanotubes ; Nickel&ndash ; titanium ; Wettability
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：30 May, 2012
• 卷：70
• 期：Complete
• 页码：382-393
• 文件大小：2232 K

摘要

Electrochemical anodization has become a prevalent surface modification method for biomaterials nowadays. In this study we prepared Ni₂O₃-doped TiO₂ nanotubes (NTs) on NiTi alloy using electrochemical anodization method and explored its suitability for biomedical applications. Morphology, composition and microstructure of NT films were found to depend on preparation conditions. NT film prepared at 35 V, 45 掳C and 10 min had well-defined nanotubular architecture and were composed of TiO₂ and a small amount of Ni₂O₃. Annealing at 450 掳C, the film remained amorphous structure, with excellent corrosion resistance. At annealing temperatures of 600 掳C, rutile crystalline was formed thus enhanced the bioactivity of the film. Formation of NT film on the surface of NiTi alloy also increased its wettability, especially for 600 掳C annealed sample, so the biological response is expected to be improved. Our results indicate that annealing the NT film coated NiTi alloy at 450 掳C is desirable for cardiovascular applications. This attributes to its advantages such as the eliminated toxic F species, enhanced corrosion resistance and reduced risk of calcification. For orthopedic applications, annealing at 600 掳C is preferred due to its enhanced corrosion resistance and bioactivity.