类蝴蝶翅膀表面微纳结构的制备及其疏水性

在金属表面构筑微纳米粗糙结构后以低表面能物质修饰,可以获得超疏水的金属表面,对实现防水、防腐及表面自清洁等功能具有重要的意义。以钛片为基底,利用简单易行且低成本的喷砂-酸蚀法,对其进行粗糙化处理,并使用低表面能物质氟碳树脂进行表面改性,获得了超疏水性表面。测量了试样表面与蒸馏水的静态接触角,将试样置于空气、模拟海水、质量分数为3%的NaOH和HCl溶液中进行了耐环境测试,观察了试样表面的微观形貌。结果表明:在光滑的钛基底上用氟碳树脂修饰后,得到的疏水表面接触角仅为103°;而钛片表面经喷砂-酸蚀后,再利用氟碳树脂进行疏水化修饰,得到与水接触角为156°的超疏水表面。经表面粗糙化处理和低表面能物质修饰后得到的钛基底上形成了类蝴蝶翅膀表面微纳结构的蜂窝状超疏水表面,具有优异的耐环境性和良好的自清洁效果。

Preparation and Hydrophobic Properties of the Micronano Structure of Butterfly Wing Surface

Superhydrophobic metal surface is very important because of their wide applications, in waterproof, anticorrosion and selfcleaning aspects. These special surfaces can be achieved by combining the micronano structure with the low surface energy material on the metal surface. To prepare superhydrophobic surface, the surface roughening was attained by using sandblasting and acidetching on Ti substrate as a simple and low cost route, and subsequently modified using fluorine carbon resin as low surface energy material. The static contact angle of the specimen surface and the distilled water was measured. The environmental testing was taken under the air, the simulated seawater and the mass fraction of 3% NaOH and HCl solution, and the microstructure of the sample surface was observed. The results show that the surface contact angle of fluorine carbon resin modified original Ti substrate is 103°; while the hydrophobic surface contact angle is 156°, as for the fluorocarbon resin modified Ti substrate with sand blasting and acid etching preroughening treatment. According to the SEM results, the honeycomb structure of superhydrophobic surface is similar to the micronano structure of butterfly wing, which exhibits an excellent environment resistance and a good selfcleaning effect.