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首页> 外文期刊>Applied Surface Science >Surface characteristics, Ni ion release, and antibacterial efficacy of anodized NiTi alloy using HNO_3 electrolyte of various concentrations
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Surface characteristics, Ni ion release, and antibacterial efficacy of anodized NiTi alloy using HNO_3 electrolyte of various concentrations

机译：使用不同浓度的HNO_3电解质的阳极氧化NiTi合金的表面特性，Ni离子释放和抗菌功效

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摘要

A titanium oxide layer containing a small amount of Ni can be formed on a NiTi surface through anodization when using HNO3 as an electrolyte. In this study, the effect of different HNO3 concentrations on the surface characteristics of the alloy, including hydrophilicity, Ni-ion release, and antibacterial efficacy, was investigated. An oxide layer was fabricated, in which tiny pores were generated by pitting corrosion. The layer thickness and pore size varied with the concentration of the HNO3 electrolyte. The hydrophilicity of the NiTi surface was dramatically improved through anodization owing to the formation of the oxide layer. The layer formed was expected to serve as a corrosion protection barrier; however, the Ni release rate from the anodized surface was higher than that of an untreated surface due to the generation of pores. The Ni release rate from the anodized surfaces varied depending on the electrolyte concentrations used, owing to the balance between the layer thickness and pore size. Ni ion release was advantageous from the view of antibacterial efficacies; the efficacies of NiTi alloy against E. coli and S. aureus were actually enhanced by anodization. Ni ion release was not beneficial with regards to allergenic reaction and cytotoxicity; the Ni ion release rate decreased rapidly when the alloy was soaked in a simulated body fluid. Thus, we concluded that anodization in HNO3 is one possible approach to fabricate ideal NiTi medical devices with excellent antibacterial performance and biosafety.
机译：当使用HNO 3作为电解质时，可以通过阳极氧化在NiTi表面上形成包含少量Ni的钛氧化物层。在这项研究中，研究了不同浓度的HNO3对合金表面特性（包括亲水性，Ni离子释放和抗菌功效）的影响。制作了一个氧化层，其中通过点蚀产生了微小的孔。层厚度和孔径随HNO 3电解质的浓度而变化。由于氧化层的形成，通过阳极氧化显着改善了NiTi表面的亲水性。预期所形成的层将用作腐蚀防护层；然而，由于气孔的产生，Ni从阳极氧化表面的释放速率高于未处理表面。由于层厚度和孔尺寸之间的平衡，从阳极氧化表面释放的Ni取决于所用的电解质浓度而变化。从抗菌效果的角度来看，释放镍离子是有利的。 NiTi合金对大肠杆菌和金黄色葡萄球菌的功效实际上通过阳极氧化得到了增强。镍离子释放对过敏反应和细胞毒性无益。当合金浸泡在模拟体液中时，镍离子释放速率迅速降低。因此，我们得出结论，在HNO3中进行阳极氧化是制造具有出色抗菌性能和生物安全性的理想NiTi医疗器械的一种可能方法。

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