4.6 Article

The wetting transition of low surface tension droplet on the special-shaped microstructure surface

期刊

出版社

ELSEVIER
DOI: 10.1016/j.colcom.2022.100649

关键词

Low surface tension droplet; Reentrant microstructure; Wetting transition; Breakthrough pressure; Energy barrier

资金

  1. National Natural Science Foundation of China [52036001]

向作者/读者索取更多资源

Hydrophobic surfaces are widely used due to their excellent properties. This study investigates the wetting behavior of droplets on reentrant microstructure surfaces using numerical simulations. The results show that the reentrant structure can effectively inhibit wetting transition and maintain a large apparent contact angle. The geometric parameters of the reentrant structure have a significant impact on the wetting behavior.
The hydrophobic surfaces have been widely used in many field due to their excellent properties. However, the droplet with low surface tension can easily undergo wetting transition and highly infiltrate on a surface with conventional structure, so it is difficult to achieve the hydrophobic state. Preliminary bionics studies showed that the microstructure surface with a reentrant angle could suspend the droplet with low surface tension to achieve the hydrophobic property. But, the wetting mechanism of droplet on the reentrant microstructure surface was not clear. The wettability of the droplet on the reentrant microstructure surface was studied with the numerical method of VOF-CSF in this paper. It was found that the reentrant structure could effectively inhibit the occurrence of wetting transition compared with the conventional columnar-shaped structure, so that the hydrophilic droplet remained suspended and showed a large apparent contact angle. The mechanical model and the relative surface free energy of the droplet in the wetting process on the reentrant microstructure surface were analyzed theoretically. It was found that the geometrical parameters of reentrant structure affected the breakthrough pressure and energy barrier, and then affected the wetting transition. The results showed that the performance of doubly-reentrant structure was better than that of singly-reentrant structure in inhibiting wetting transition. For the reentrant structure with larger width and smaller spacing, the advantage of inhibiting wetting transition was more obvious, and the effect of width gradually disappeared with the increase of spacing. For the droplet that has been suspended on the reentrant structure surface, a slight change of structure width will greatly affect the stability of the small droplet.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据