Molecular investigation on the formation and transition of condensation mode on the surface with nanostructure
Molecular investigation on the formation and transition of condensation mode on the surface with nanostructure
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纳米结构表面凝聚态形成与转变的分子研究
DOI：
10.1016/j.molliq.2022.120848
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发表时间：
2022-11
影响因子：
6
通讯作者：
Dong-Ming Mo
中科院分区：
文献类型：
--
作者：
Jun-Feng Shen;Chun-Mei Wu;Dong-Ming Mo
为了研究纳米结构表面上蒸汽冷凝的润湿转变过程，进行了一系列的分子动力学模拟。在不同的表面润湿性和温度差下，绘制了凝结的起始和模式转变。与光滑表面相比，纳米结构表面在较小的温差或较弱的润湿性下即可引发冷凝。当n * < 0.35时，冷凝液克服纳米柱的粘性力形成Cassie液滴，当n *<0.35时，冷凝液浸入纳米柱中形成Wenzel液滴或液膜。Cassie液滴是由凝结水通过自发脱湿转变（SDT）演化而来的。三种模式的SDT观察和潜在的微观机制进行了讨论。对于去湿转变过程的模式I，它被呈现为单个液滴自发地克服纳米结构的钉扎力而悬浮。对于模式II，液滴在纳米柱内部聚结并在多个纳米柱上逐渐去湿，或者相邻的Wenzel液滴接触以在纳米结构的上部形成液桥，从而促进SDT。对于模式III，生长的Wenzel液滴与悬浮的Cassie液滴合并以完成SDT。同时，液滴SDT过程伴随着势能的降低，这主要是由表面张力驱动的。对于一个小的n * 和冷凝率，模式I占主导地位的液滴去湿过程。随着表面润湿性的增加，模式I的比例减少，而模式II和模式III的比例相应增加。
To investigate the wetting transition process of vapor condensation on a nanostructured surface, a series of molecular dynamics simulations are performed. With different surface wettabilityn* and temperature difference, the initiation of condensation and mode transitions are mapped. Compared with smooth surface, the condensation on the nanostructured surface can be initiated at a smaller temperature difference or weaker wettability. Whenn* < 0.35, the condensate overcomes the viscous force from nanopillars to form Cassie droplets, otherwise, it will immerse into the nanopillars to form Wenzel droplet or liquid film. Cassie droplet is evolved from condensate through spontaneously dewetting transition (SDT). Three modes of SDT are observed and the underlying microscopic mechanisms are discussed. For the mode I of dewetting transition process, it is presented as a single droplet spontaneously overcoming the pinning force of nanostructure to be suspended. For mode II, droplets coalesce inside the nanopillars and gradually dewet over multiple nanopillars, or the adjacent Wenzel droplets contact to form a liquid bridge on the upper of the nanostructures, promoting the SDT. For the mode III, the growing Wenzel droplets coalesce with the suspended Cassie droplets to complete SDT. Meanwhile, the droplet SDT process is accompanied by a decrease in potential energy, which is mainly driven by the surface tension. For a smalln* and condensation rates, mode I dominates the droplet dewetting process. With the increase of surface wettability, the proportion of mode I decreases, while the proportion of mode II and mode III increases accordingly.
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DOI：
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DOI：
10.1021/acs.langmuir.9b03339
发表时间：
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期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
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作者：
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通讯作者：
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