Plasma hydrophilization under various conditions was carried out on Ti substrates to investigate the effect of the applied parameters on the hydrophilic sustainability. The plasma was discharged from gases comprising Ar and/or O₂ at various ratios using DC and RF modes. Notable differences in the surface morphology by the plasma conditions was hardly found, while the ratio of hydroxide on the surface was influenced by the discharge mode. The hydrophilicity was significantly improved regardless of the treatment conditions, that is, the gas composition and discharge mode. The deterioration of the hydrophilicity was occurred by storing in the ambient atmosphere or distilled water, wherein the deterioration in distilled water was suppressed when using DC as a discharge mode. The hydrophilicity was preserved when the specimens was stored in a physiological solution such as phosphate buffered saline solution due to the adsorption of Na⁺ and Cl⁻ in the solution; its effect was far superior to that contributed by the parameter settings. In conclusion, plasma discharge mode enabled to improve the deterioration of hydrophilicity only slightly.

中文翻译：

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等离子水化钛表面放电方式和气体组成对亲水性可持续性的影响

在Ti基片上进行了各种条件下的等离子体亲水化处理，以研究所应用参数对亲水性可持续性的影响。从包含Ar和/或O _2的气体中释放出等离子体使用DC和RF模式以各种比例变化。几乎没有发现由等离子体条件引起的表面形态的显着差异，而表面上的氢氧化物的比例受放电方式的影响。不管处理条件，即气体组成和排出方式如何，亲水性均得到显着改善。亲水性的降低是通过将其储存在环境气氛或蒸馏水中而发生的，其中当将DC用作放电模式时，抑制了蒸馏水中的劣化。当样品保存在生理溶液（如磷酸盐缓冲盐溶液）中时，由于Na ⁺和Cl-的吸附，亲水性得以保留^。在解决方案中；其效果远远优于参数设置。总之，等离子体放电模式仅能稍微改善亲水性的降低。