Chu C L, Wang R M, Hu T, Yin L H, Pu Y P, Lin P H, Dong Y S, Guo C, Chung C Y, Yeung K W K, Chu Paul K
Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, 211189, China.
J Mater Sci Mater Med. 2009 Jan;20(1):223-8. doi: 10.1007/s10856-008-3563-6. Epub 2008 Aug 30.
A dense titania film is fabricated in situ on NiTi shape memory alloy (SMA) by anodic oxidation in a Na(2)SO(4) 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.
通过在Na₂SO₄电解液中进行阳极氧化，在NiTi形状记忆合金（SMA）上原位制备了致密的二氧化钛薄膜。通过扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、电感耦合等离子体质谱（ICPMS）、溶血分析和血小板黏附试验，研究了二氧化钛薄膜的微观结构及其对NiTi SMA生物相容性的影响。结果表明，二氧化钛薄膜在表面附近有一个无镍区，并且在模拟体液中能够有效阻止有害镍离子从NiTi基体中释放出来。此外，通过这种阳极氧化方法，NiTi样品的润湿性、抗溶血性能和抗血栓性能都得到了改善。
