在粗糙表面固液接触角的Wenzel模型和Cassie模型的基础上,考虑规则粗糙形貌中液体浸润性对表观接触角的影响,推导出了一种新的规则粗糙表面的表观接触角模型。数值分析结果表明,规则形貌的设计可以控制液体的浸润特性,以及固液表观接触角,其中微孔的孔深和孔分辨率等几何参数成为重要的控制参数。同时,我们进行了相关的实验验证。这种考虑液体浸润性的表观接触角模型,也提供了对表观接触角滞后现象解释的可能。
Following the solid-liquid contact angle models of rough surface, namely the Wenzel model and the Cassie model, and considering the influence of liquid wetting properties of the regular topography of a rough surface on the apparent contact angle, we derive a novel apparent contact angle model for the regular rough surface. Numerical analysis results show that the design of the regular topography can control the liquid wetting properties and the solidliquid apparent contact angle. The geometrical parameters of the depth and resolution of a microimple are important control parameters. The experiments on the apparent contact angle model verify that it can also explain the hysteresis of the apparent contact angle.