3-D thermodynamic analysis of superhydrophobic surfaces.
3-D thermodynamic analysis of superhydrophobic surfaces.
复制标题
DOI：
10.1016/j.jcis.2008.06.044
复制
发表时间：
2008-10
影响因子：
9.9
通讯作者：
Ken Yamamoto;S. Ogata
中科院分区：
文献类型：
--
作者：
Ken Yamamoto;S. Ogata
一些具有微纹理的表面强烈排斥水。特别是，接触角(CA)大于150°的表面被称为超疏水表面，已有许多关于获得此类表面的研究报道。然而，它们都不能作为实现超疏水的指导，其热力学机制也不是很清楚。在本研究中，选取了两种类型的三维模型-柱状纹理表面和空腔表面-并对其进行了热力学分析，重点是表面自由能。通过计算，得到了平衡CA、自由能壁(少数)和CA滞后。在此基础上，指出了确定滑动角的因素。此外，在这些结果的基础上，提出了一个超疏水表面的最佳几何构型的例子。
Some microtextured surfaces strongly repel water. In particular, surfaces with contact angle (CA) higher than 150° are called superhydrophobic surfaces and many studies to obtain such surfaces have been reported. However, none of them could be a guide to achieve superhydrophobicity and the thermodynamic mechanisms are not well understood. In this study, two types of 3-D models—pillar-textured surfaces and cavity surfaces—were selected and thermodynamically analyzed focusing on the surface free energy. By calculations, equilibrium CA, free energy wall (FEW), and CA hysteresis are obtained. Based on these calculations, the factors to determine the sliding angle are indicated. Additionally, based on these results, one example of the optimal geometry for superhydrophobic surfaces is proposed.