He Liang, Sui Xin, Liang Wenyan, Wang Zhenqing, Akbarzadeh Abdolhamid
College of Aerospace and Civil Engineering, Harbin Engineering University Harbin 150001 China
Department of Bioresource Engineering, McGill University Island of Montreal QC H9X 3V9 Canada
RSC Adv. 2018 Sep 12;8(55):31735-31744. doi: 10.1039/c8ra06626d. eCollection 2018 Sep 5.
In this paper, the measurement process of advancing and receding contact angles (CA) in experiments is simulated using Surface Evolver (SE). The normalized energy of the droplet is calculated by fixing the three-phase contact line that lies at the boundary between stripes and by changing the droplet volume. The most stable wetting state is determined for each stripe configuration. The slip-jump behavior of the three-phase contact line is observed. Furthermore, a small wet stripe width and large dry stripe width is found to be favorable for achieving large stable equilibrium CA. Moreover, the minimum advancing CA and maximum receding CA can be obtained by assigning a value of zero to the normalized energy barrier. The variation of minimum advancing CA and maximum receding CA with wet and dry stripe widths follows the same trend as the stable equilibrium CA. Combined with the existing model in the literature, the approach introduced in this paper can be used to narrow down the predicted range of dynamic CAs and also to provide guidance for designing anisotropic surfaces.
在本文中，使用表面演化器（SE）模拟了实验中前进和后退接触角（CA）的测量过程。通过固定位于条纹边界处的三相接触线并改变液滴体积来计算液滴的归一化能量。针对每种条纹配置确定最稳定的润湿状态。观察到三相接触线的滑移-跳跃行为。此外，发现较小的湿条纹宽度和较大的干条纹宽度有利于实现较大的稳定平衡接触角。而且，通过将归一化能量势垒的值设为零，可以获得最小前进接触角和最大后退接触角。最小前进接触角和最大后退接触角随湿条纹和干条纹宽度的变化趋势与稳定平衡接触角相同。结合文献中现有的模型，本文介绍的方法可用于缩小动态接触角的预测范围，并为设计各向异性表面提供指导。
