冻结-融化介导的去湿转变：在具有冷凝的超疏水表面上的液滴行为
Freezing-Melting Mediated Dewetting Transition for Droplets on Superhydrophobic Surfaces with Condensation
AI总结：
本研究提出冻结-融化策略，实现超疏水表面液滴从Wenzel到Cassie-Baxter状态的去湿转变，分析了冷凝引发的湿性转变及不同表面结构对液滴行为的影响。
摘要：
超疏水表面的水排斥性能使其在许多应用中具有前景。然而，在一些极端环境中，如高湿度和低温条件下，表面冷凝是不可避免的，这会引发表面超疏水性的丧失。在本研究中，我们提出了一种冻结-融化策略，以实现从Wenzel状态到Cassie-Baxter状态的去湿转变。该策略要求通过降低基底温度冻结液滴，然后通过加热基底融化液滴。首先分析了由冷凝引发的从Cassie-Baxter状态到Wenzel状态的湿性转变。比较了两种类型的超疏水表面，即单尺度纳米结构超疏水表面和分层尺度微纳结构超疏水表面，并分析了它们对液滴静态接触状态和冲击过程的影响。通过探讨表面微/纳米结构的差异，分析了去湿转变的机制，并将其归因于超疏水表面的独特结构和强度。这些发现将丰富我们对涉及相变的液滴-表面相互作用的理解，并为超疏水表面的设计具有广阔的应用前景。
英文摘要：
The water-repellence properties of superhydrophobic surfaces make them promising for many applications. However, in some extreme environments, such as high humidities and low temperatures, condensation on the surface is inevitable, which induces the loss of surface superhydrophobicity. In this study, we propose a freezing-melting strategy to achieve the dewetting transition from the Wenzel state to the Cassie-Baxter state. It requires freezing the droplet by reducing the substrate temperature and then melting the droplet by heating the substrate. The condensation-induced wetting transition from the Cassie-Baxter state to the Wenzel state is analyzed first. Two kinds of superhydrophobic surfaces, i.e., single-scale nano-structured superhydrophobic surface and hierarchical-scale micro-nano-structured superhydrophobic surface, are compared and their effects on the static contact states and impact processes of droplets are analyzed. The mechanism for the dewetting transition is analyzed by exploring the differences in the micro/nano-structures of the surfaces and it is attributed to the unique structure and strength of the superhydrophobic surface. These findings will enrich our understanding of the droplet-surface interaction involving phase changes and have great application prospects for the design of superhydrophobic surfaces.
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