Water impacting on superhydrophobic macrotextures.
Water impacting on superhydrophobic macrotextures.
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DOI：
10.1038/ncomms9001
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发表时间：
2015-08-11
影响因子：
16.6
通讯作者：
Quéré D
中科院分区：
文献类型：
--
作者：
Gauthier A;Symon S;Clanet C;Quéré D
最近的研究表明，与在平面上观察到的情况相比，在超疏水材料上存在宏观织体可以显着改变水影响它们的动力学，特别是显着减少弹跳滴的接触时间。这一发现在最大限度地提高防水性能方面迈出了重要的一步，因为它可以进一步减少固体和液体之间的接触。它还开辟了研究超结构设计的新方向，以诱导诸如防冻、液体破碎和/或重组、引导、捕获等特定功能。在这里，我们证明了当冲击速度变化时，水滴在排斥宏观纹理上弹跳的接触时间取离散值。这使我们能够提出减少接触时间的定量分析，从而理解宏观纹理如何以及为什么可以控制弹跳滴的动态特性。水影响表面的行为对许多应用至关重要，包括防结冰和自清洁。在这里，Gauthier等人证明了水滴在直线上的接触时间随着冲击速度呈阶梯递减，这是由于水在均匀分布的亚单位中破碎造成的。
It has been recently shown that the presence of macrotextures on superhydrophobic materials can markedly modify the dynamics of water impacting them, and in particular significantly reduce the contact time of bouncing drops, compared with what is observed on a flat surface. This finding constitutes a significant step in the maximization of water repellency, since it enables to minimize even further the contact between solid and liquid. It also opens a new axis of research on the design of super-structures to induce specific functions such as anti-freezing, liquid fragmentation and/or recomposition, guiding, trapping and so on. Here we show that the contact time of drops bouncing on a repellent macrotexture takes discrete values when varying the impact speed. This allows us to propose a quantitative analysis of the reduction of contact time and thus to understand how and why macrotextures can control the dynamical properties of bouncing drops. The behaviour of water impacting on surfaces is crucial to many applications, including anti-icings and self-cleaning. Here, Gauthier et al. show that the contact time of drops on a straight wire decreases with impact speed in a step manner due to the fragmentation of water in evenly divided subunits.