荷叶表面的复刻及微纳结构对疏水性能的影响

Fast replication method for lotus leaf and effect of micro-nanostructure on hydrophobic properties

结合改进的模板法和ZnO水热生长法在环氧树脂基底上得到了荷叶仿生超疏水结构,该方法工艺流程简单、制作成本低廉,可以实现微观结构的快速复刻。研究了模板法对天然表面复刻的适用范围,其对荷叶和水稻等具有突起类微观结构表面的复刻效果良好,并研究了水热法中ZnO生长液浓度对纳米结构的影响。同时为了研究不同微观结构对表面疏水性能的影响,制作了光滑表面、纳米结构表面和仿荷叶微米结构表面,并测试了表面的疏水性能。结果表明,粗糙结构能够提高低能表面的疏水性能,微纳复合结构更有利于表面形成超疏水;增加表面的粗糙结构能够增加液滴与固体接触面上的气-液占比,进而使得液滴在表面的接触角增加。

Artificial lotus leaves superhydrophobic hierarchical structure was obtained on epoxy resin substrates by improved molding method and zinc oxide hydrothermal growth method.The process of this method is simple and low-cost,and the natural micro-structure can be quickly reproduced on the artificial surface.The molding method is effectively used for lotus and rice leave with protuberant microstructures.And the effect of ZnO growth liquid concentration on nanostructure was also studied.Then,in order to study the influence of microstructures at different scale sizes on the hydrophobic properties of the surface,smooth surface,nanostructure surface and microstructure lotus replica surface were fabricated.the hydrophobic properties of these surfaces were measured.The date shows that the rough structure can improve the hydrophobicity of the surface,and the micro-nano hierarchical structure is more helpful to the formation of superhydrophobicity on the surface.When droplets contact with the surface in Cassie state,the larger the proportion of air on the contact area,the smaller the contact angle and the smaller the sliding angle on the surface.