Journal
APPLIED SURFACE SCIENCE
Volume 257, Issue 21, Pages 9086-9093Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.05.105
Keywords
Ultrafine-grained alloy; Surface modification; Corrosion resistance; Cytocompatibility
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Funding
- National High Technology Research and Development Program of China (863 Program) [2011AA030101, 2011AA030103]
- NSFC-RFBR [31011120091]
- National Natural Science Foundation of China [51041004]
- Ministry of Science and Technology of China [2007CB936103]
- Research Funds for the Central Universities [PKUJC2009001]
- Program for New Century Excellent Talents in University [NCET-07-0033]
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Bulk ultrafine-grained Ni(50.8)Ti(49.2) alloy (UFG-NiTi) was successfully fabricated by equal-channel angular pressing (ECAP) technique in the present study, and to further improve its surface biocompatibility, surface modification techniques including sandblasting, acid etching and alkali treatment were employed to produce either irregularly roughened surface or microporous surface or hierarchical porous surface with bioactivity. The effect of the above surface treatments on the surface roughness, wettability, corrosion behavior, ion release, apatite forming ability and cytocompatibility of UFG-NiTi alloy were systematically investigated with the coarse-grained NiTi alloy as control. The pitting corrosion potential (E(pit)) was increased from 393 mV (SCE) to 704 mV (SCE) with sandblasting and further increased to 1539 mV (SCE) with following acid etching in HF/HNO(3) solution. All the above surface treatment increased the apatite forming ability of UFG-NiTi in varying degrees when soaked them in simulated body fluid (SBF). Meanwhile, both sandblasting and acid etching could promote the cytocompatibility for osteoblasts: sandblasting enhanced cell attachment and acid etching increased cell proliferation. The different corrosion behavior, apatite forming ability and cellular response of UFG-NiTi after different surface modifications are attributed to the topography and wettability of the resulting surface oxide layer. (C) 2011 Elsevier B.V. All rights reserved.
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