Self-Organization of Microscale Condensate for Delayed Flooding of Nanostructured Superhydrophobic Surfaces
Self-Organization of Microscale Condensate for Delayed Flooding of Nanostructured Superhydrophobic Surfaces
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DOI：
10.1021/acsami.6b00852
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发表时间：
2016-03-02
影响因子：
9.5
通讯作者：
McCarthy, Matthew
中科院分区：
文献类型：
--
作者：
Oelceroglu, Emre;McCarthy, Matthew
超疏水表面通过抑制绝缘液体层的形成来增强冷凝。虽然这在低过饱和度下产生有效的热传递，但超疏水性已被证明在增加的过饱和度下分解。随着传热的增加，随机分布和高密度的成核位点产生钉扎液滴，这导致不可控制的溢流。在这项工作中，润湿性的工程变化被用来促进微尺度液滴的自组织，这被证明可以有效地延迟洪水。病毒模板化的超疏水表面图案化有超亲水岛阵列，其设计用于最小化表面粘附，同时促进空间秩序。通过使用电子显微镜，在冷凝过程中优化和表征表面。混合润湿性赋予空间秩序，不仅通过优先成核，但更重要的是通过自组织的聚结液滴在高过饱和度。微尺度液滴（直径> 1mm）的自组织被示出有效地延迟溢流并控制表面上的较大液滴（直径> 1mm）的全局润湿行为。随着热传递的增加，表面从跳跃模式过渡到脱落模式去除，没有洪水。这证明了设计表面以抵抗洪水的能力，并且可以作为开发用于冷凝应用的坚固的超疏水表面的基础。光学和
Superhydrophobic surfaces enhance condensation by inhibiting the formation of an insulating liquid layer. While this produces efficient heat transfer at low super saturations, superhydrophobicity has been shown to break down at increased supersaturations. As heat transfer increases, the random distribution and high density of nucleation sites produces pinned droplets, which lead to uncontrollable flooding. In this work, engineered variations in wettability are used to promote the self-Organization of microscale droplets, which is shown to effectively delay flooding. Virus-templated superhydrophobic surfaces are patterned with an array of superhydrophilic islands designed to minimize surface adhesion while promoting spatial order. By use electron microscopy, the surfaces are optimized and characterized during condensation. Mixed wettability imparts spatial order not only through preferential nucleation but more importantly through the self-organization of coalescing droplets at high supersaturations. The self-organization of microscale droplets (diameters of is shown to effectively delay flooding and govern the global wetting behavior of larger droplets (diameters of >1 mm) on the surface. As heat transfer increases, the surfaces transition from jumping-mode to shedding-mode removal with no flooding. This dernonstrates the ability to engineer surfaces to resist flooding and can act as the basis for developing robust superhydrophobic surfaces for condensation applications. of optical and