Tip-induced flipping of droplets on Janus pillars: From local reconfiguration to global transport
Tip-induced flipping of droplets on Janus pillars: From local reconfiguration to global transport
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DOI：
10.1126/sciadv.abb4540
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发表时间：
2020-07-01
期刊：
影响因子：
13.6
通讯作者：
Wang, Zuankai
中科院分区：
文献类型：
--
作者：
Feng, Shile;Delannoy, Joachim;Wang, Zuankai
尽管水滴很简单，但它们表现出广泛的形式和动力学，可以使用固体表面的特殊纹理来实现所需的功能。沿着这条脉络，天然或合成材料可以呈现防水、疏油、防雾、各向异性等。所有的性质都是由基底的原始设计和/或由在液滴尺度上促进毛细力或弹性力的特殊材料的使用产生的。在这里，我们报告了一个原始的现象发生在尖端的不对称（半平，半弯曲）支柱：液滴重新配置，并获得这些Janus提示的弯曲侧的方向。这种局部的几何驱动效应，即尖端诱导的液滴翻转，被认为是通用的，并具有壮观的全球性后果：Janus柱的巨大组件使从雾中收集的水能够连续，长距离和快速的自我运输，这使得收集和浓缩不同尺度的液滴成为可能。
Despite their simplicity, water droplets manifest a wide spectrum of forms and dynamics, which can be actuated using special texture at solid surfaces to achieve desired functions. Along this vein, natural or synthetic materials can be rendered water repellent, oleophobic, antifogging, anisotropic, etc.-all properties arising from an original design of the substrate and/or from the use of special materials promoting capillary or elastic forces at the droplet scale. Here, we report an original phenomenon occurring at the tip of asymmetric (half-flat, half-curved) pillars: Droplets reconfigure and get oriented on the curved side of these Janus tips. This local, geometry-driven effect, namely, tip-induced flipping of droplets, is found to be generic and have spectacular global consequences: Vast assemblies of Janus pillars enable a continuous, long-range, and fast self-transport of water harvested from fogs, which makes it possible to collect and concentrate droplets at different scales.