Loss of superhydrophobicity of hydrophobic micro/nano structures during condensation.
Loss of superhydrophobicity of hydrophobic micro/nano structures during condensation.
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DOI：
10.1038/srep09901
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发表时间：
2015-04-23
影响因子：
4.6
通讯作者：
Ahn HS
中科院分区：
文献类型：
--
作者：
Jo H;Hwang KW;Kim D;Kiyofumi M;Park HS;Kim MH;Ahn HS
疏水微/纳米结构表面上的冷凝液行为是一个具有多种实际应用的主题，但仍然知之甚少。特别是，超疏水性的疏水性的微/纳米结构在冷凝过程中的损失，即使当相同的表面显示防水特性时，暴露于空气中，需要深入的调查，以提高和应用我们的冷凝的基本物理的理解。在这里，我们假设的标准所需的冷凝形成从内部的表面结构，通过检查冷凝系统的大电位，包括冷凝液体的性质和冷凝所需的条件。结果表明，相同的疏水微/纳结构表面在不同的条件下会表现出不同的液滴行为。我们的研究结果是支持所观察到的现象：从内部的疏水腔，表观润湿状态的变化，和疏水微/纳米结构的表面上的粘性凝聚液滴的存在下的冷凝液滴的启动。
Condensed liquid behavior on hydrophobic micro/nano-structured surfaces is a subject with multiple practical applications, but remains poorly understood. In particular, the loss of superhydrophobicity of hydrophobic micro/nanostructures during condensation, even when the same surface shows water-repellant characteristics when exposed to air, requires intensive investigation to improve and apply our understanding of the fundamental physics of condensation. Here, we postulate the criterion required for condensation to form from inside the surface structures by examining the grand potentials of a condensation system, including the properties of the condensed liquid and the conditions required for condensation. The results imply that the same hydrophobic micro/nano-structured surface could exhibit different liquid droplet behavior depending on the conditions. Our findings are supported by the observed phenomena: the initiation of a condensed droplet from inside a hydrophobic cavity, the apparent wetted state changes, and the presence of sticky condensed droplets on the hydrophobic micro/nano-structured surface.