Wetting and Dewetting Transitions on Submerged Superhydrophobic Surfaces with Hierarchical Structures

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• 作者：Huaping WuZhe Yang ; Binbin Cao ; Zheng Zhang ; Kai Zhu ; Bingbing Wu ; Shaofei Jiang ; Guozhong Chai
• 刊名：Langmuir
• 出版年：2017
• 出版时间：January 10, 2017
• 年：2017
• 卷：33
• 期：1
• 页码：407-416
• 全文大小：655K
• ISSN：1520-5827

文摘

The wetting transition on submersed superhydrophobic surfaces with hierarchical structures and the influence of trapped air on superhydrophobic stability are predicted based on the thermodynamics and mechanical analyses. The dewetting transition on the hierarchically structured surfaces is investigated, and two necessary thermodynamic conditions and a mechanical balance condition for dewetting transition are proposed. The corresponding thermodynamic phase diagram of reversible transition and the critical reversed pressure well explain the experimental results reported previously. Our theory provides a useful guideline for precise controlling of breaking down and recovering of superhydrophobicity by designing superhydrophobic surfaces with hierarchical structures under water.