接触角
曲率
磁滞
微观结构
表面张力
材料科学
润湿
曲面(拓扑)
表面能
单层
机械
复合材料
热力学
凝聚态物理
物理
几何学
数学
作者
Yue-lan Di,Junhong Qiu,Gang Wang,Hai-dou Wang,Ling Lan,Zheng Boyuan
出处
期刊:Langmuir
[American Chemical Society]
日期:2021-06-03
卷期号:37 (23): 7078-7086
被引量:6
标识
DOI:10.1021/acs.langmuir.1c00676
摘要
It is confirmed that surfaces with specific microstructures could exhibit good superhydrophobic properties, and there are also a lot of conclusions about droplet hysteresis behavior. However, most of the research methods are based on two-dimensional ideal model and experimental observation at the macroscale. Further research needs to be conducted about the hysteresis behavior of droplets on the microstructure surface under three-dimensional conditions. In this paper, the influence of curvature variation of the liquid surface between pillars on the contact angle hysteresis (CAH) has been investigated. The simulation results were in good agreement with the experimental measurements. Analyses were conducted on the morphology change and force of the liquid surface between pillars, and an index was proposed to describe the degree of difficulty of liquid surface movement. It was revealed that a change in the direction of the surface tension at the three-phase interface caused by curvature variation of the liquid surface between pillars played an important role in the movement of the liquid surface. The greater the surface tension component in the normal direction of the liquid surface, the more likely it was for the liquid surface to advance or recede. The local curvature of the liquid surface increased or the angles between the pillars increased, and the effect of the CAH would be weakened.
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