【摘 要】
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The effects of H2O2 pretreatment on the surface characteristics and bioactivity of NaOH-treated NiTi shape memory alloy(SMA) were investigated by scanning elect
【机 构】
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School of Materials Science and Engineering, Southeast University, Nanjing 210096, China;School of P
论文部分内容阅读
The effects of H2O2 pretreatment on the surface characteristics and bioactivity of NaOH-treated NiTi shape memory alloy(SMA) were investigated by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectra,Fourier transform infrared spectroscopy as well as a simulated body fluid(SBF) soaking test. It is found that the H2O2 pretreatment can lead to the direct creation of more Ti-OH groups and the decrease in the amount ofNi2O3, Na2TiO3 and remnant NiTi phases on the surfaces of bioactive NiTi SMA prepared by NaOH treatment. As a result, the induction period of apatite formation is shortened by dispensing with the slow kinetic formation process of Ti-OH groups via an exchange of Na+ ions from Na2TiO3 phase with H3O+ ions in SBF, which indicates that the bioactivity of NaOH-treated NiTi SMA can be further improved by the H2O2pretreatment.
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