Formation of a nano-pattering NiTi surface with Ni-depleted superficial layer to promote corrosion resistance and endothelial cell-material interaction.
Zirconium ion implantation was performed on NiTi alloy to suppress Ni ion release as well as to improve corrosion resistance and cell-material interaction. A thicker Ni-depleted nano-scale composite layer formed after Zr implantation and the corrosion resistance was evidently increased in aspects of increased E(br) - E(corr) (difference between corrosion potential and breakdown potential) and decreased corrosion current density. 2.5/2 NiTi sample possessed the highest E(br) - E(corr), more than 500 mV higher than that of untreated NiTi, suggesting a significant improvement on pitting corrosion resistance. Ni ion release rate of Zr-NiTi was decreased due to the depletion of Ni in the superficial surface layer and the diffusion resistance effect of the ZrO(2)/TiO(2) nano-film. Increased surface wettability induced by increased surface roughness was obtained after Zr implantation. Zr-NiTi samples were found to be favorable to endothelial cells (ECs) proliferation, especially after 5 and 7 days culture.
School of Materials Science and Engineering, Beihang University, Beijing, People's Republic of China.
Tingting
T
Zhao
Yan
Y
Li
Yun
Y
Xia
Subbu S
SS
Venkatraman
Yan
Y
Xiang
Xinqing
X
Zhao
D001672:Biocompatible Materials; D002448:Cell Adhesion; D049109:Cell Proliferation; D002478:Cells, Cultured; D003343:Corrosion; D004730:Endothelium, Vascular / Q000166:cytology*; D006801:Humans; D036103:Nanotechnology; D009532:Nickel / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D001672:Biocompatible Materials; D009532:Nickel; D014025:Titanium