Abstract
A dense titania film is fabricated in situ on NiTi shape memory alloy (SMA) by anodic oxidation in a Na2SO4 electrolyte. The microstructure of the titania film and its influence on the biocompatibility of NiTi SMA are investigated by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICPMS), hemolysis analysis, and platelet adhesion test. The results indicate that the titania film has a Ni-free zone near the surface and can effectively block the release of harmful Ni ions from the NiTi substrate in simulated body fluids. Moreover, the wettability, hemolysis resistance, and thromboresistance of the NiTi sample are improved by this anodic oxidation method.
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Acknowledgments
The work described in this article was supported by Program for New Century Excellent Talents (NCET-06-0464) in University of Ministry of Education of China, National Natural Science Foundation of China (Project No.: 50501007), Natural Science Foundation of Jiangsu Province (Project No.: BK2007515), National High-tech Program-863 Projects of China (Project No.: 2006AA03Z445), Nippon Sheet Glass Foundation for Materials Science and Engineering (NSG Foundation), City University of Hong Kong Strategic Research Grant (SRG) No. 7001999, Hong Kong Research Grants Council (RGC), Central Allocation Grant No. 8730021.
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Chu, C.L., Wang, R.M., Hu, T. et al. XPS and biocompatibility studies of titania film on anodized NiTi shape memory alloy. J Mater Sci: Mater Med 20, 223–228 (2009). https://doi.org/10.1007/s10856-008-3563-6
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DOI: https://doi.org/10.1007/s10856-008-3563-6