Wetting transition energy curves for a droplet on a square-post patterned surface
Wetting transition energy curves for a droplet on a square-post patterned surface
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DOI：
10.1016/j.scib.2016.12.003
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发表时间：
2017-01-30
期刊：
影响因子：
18.9
通讯作者：
Yan, Yuying
中科院分区：
文献类型：
--
作者：
Gong, Wei;Zu, Yingqing;Yan, Yuying
仿生超疏水表面由于其良好的疏水性能在绿色技术中得到了广泛的应用，从而引发了对超疏水表面的广泛而深入的研究。尽管人们对润湿转变进行了理论、实验和数值模拟研究，但Cassie-巴克斯特态和Wenzel态之间的润湿转变机制仍然没有完全弄清楚，这对形成稳定的超疏水表面至关重要。本文提出并详细讨论了基于过渡过程的自由能曲线。根据给出的能量曲线，讨论了考虑重力效应和不考虑重力效应时能垒的存在性以及润湿转变的不可逆性。能量曲线表明，Cassie-to-Wenzel跃迁和反向跃迁的不同路径是导致不可逆性的主要原因。采用大密度比相场格子Boltzmann方法进行了数值模拟，模拟结果与理论分析吻合较好。(C)中国科学出版社.爱思唯尔公司、科学中国出版社出版。All rights reserved.
Due to the property of water repellence, biomimetic superhydrophobic surfaces have been widely applied to green technologies, in turn inducing wider and deeper investigations on superhydrophobic surfaces. Theoretical, experimental and numerical studies on wetting transitions have been carried out by researchers, but the mechanism of wetting transitions between Cassie- Baxter state and Wenzel state, which is crucial to develop a stable superhydrophobic surface, is still not fully understood. In this paper, the free energy curves based on the transition processes are presented and discussed in detail. The existence of energy barriers with or without consideration of the gravity effect, and the irreversibility of wetting transition are discussed based on the presented energy curves. The energy curves show that different routes of the Cassie-to-Wenzel transition and the reverse transition are the main reason for the irreversibility. Numerical simulations are implemented via a phase field lattice Boltzmann method of large density ratio, and the simulation results show good consistency with the theoretical analysis. (C) 2016 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.