期刊
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS
卷 28, 期 8, 页码 1430-1434出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2008.03.009
关键词
NiTi shape memory alloy; Electropolishing; Surface structure; Biomedical properties
资金
- University of Ministry of Education of China [NCET-06-0464]
- National Natural Science Foundation of China [50501007]
- Natural Science Foundation of Jiangsu Province [BK2007515]
- National High-tech Program-863 Projects of China [2006AA03Z445]
- NSG Foundation
- City University of Hong Kong Strategic Research Grant [7001999]
- Hong Kong Research Grants Council (RGC) [8730021]
- City University of Hong Kong Applied Research [9667002]
The surface structure and biomedical properties of NiTi shape memory alloy (SMA) samples after undergoing electropolishing and chemical polishing are determined and compared employing scanning electron microscopy, X-ray photoelectron spectroscopy, inductively-coupled plasma mass spectrometry, hemolysis analysis. blood platelet adhesion test, and MTT test. The results indicate that after chemical polishing, there is still a high Ni concentration on the surface of the NiTi SMA. On the other hand, electropolishing can form a thin Surface titanium oxide film (about 10 nm thickness) with depleted Ni. In addition to the TiO(2) phase, some titanium suboxides (TiO and Ti(2)O(3)) are found in the surface film. Compared to chemical polishing, electropolishing can more effectively mitigate out-diffusion of Ni ions and the wettability, blood compatibility, and thromboresistance are also better. However, no difference on the cytocompatibility can be observed from samples that have been chemically polished or electropolished. (c) 2008 Elsevier B.V. All rights reserved
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