目的 研究氧化处理对镍钛合金表面亲水性的影响.方法试验分为2组,即经体积分数30％的过氧化氢氧化处理后的镍钛合金组和未经氧化处理过的镍钛合金组,二者皆分别滴加去离子水和α-溴萘液滴,采用接触角测量仪行静态接触角测量.结果镍钛合金经表面氧化处理后,水与其表面的接触角和界面张力变小,合金的表面张力增加,表面润湿性、表面能以及合金与水之间的界面能等物理性能均向着有利于提高材料血液相容性的方向改善.结论氧化处理能够有效地改善镍钛合金表面热力学性质,表面润湿性、表面能以及合金与血液之间的界面能等物理性能均向着有利于提高材料血液相容性能的方向改善.%Objective To evaluate the effect of oxidation on the hydrophilic property of the medical- nickel titanium (NiTi) alloy. Methods The test samples were divided into two groups as a oxidized group and a non-oxidized group. NiTi alloy with nearly equiatomic ratio of nickel and titanium elements was selective oxidized in boiled 30% hydrogen peroxide solution solution. Then, the oxidized alloy was ultrasonically rinsed with deionized water and dried at 37 ℃. Static contact angle was measured using contact angle measuring instrument by stop drop method. The samples were placed in the sample room. Deionized water and α-bromonaphthalene were dropped on the samples surface. Then the measured pictures were acquired and the contact was evaluated by the accompanying software. Results The surface contact and interfacial tension of the oxidized NiTi alloy was lower than those of the non-oxidized while the surface tension was higher. The blood compatibility of the NiTi alloy will be improved by surface oxidation concerning wetting ability, interfacial tension and surface tension. Conclusion Surface thermodynamics properties including wetting ability, surface tension and interfacial tension are improved by oxidation treatment which leads to the improvement of blood compatibility of the NiTi alloy.
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