Wetting failure of hydrophilic surfaces promoted by surface roughness.

Wetting failure of hydrophilic surfaces promoted by surface roughness.
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表面粗糙度促进亲水表面润湿失效

DOI:
10.1038/srep05376
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发表时间:
2014-06-20
期刊:
影响因子:
4.6
通讯作者:
Wang Q
Wang Q
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhao MH;Chen XP;Wang Q

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润湿失效对于许多物理现象至关重要,例如工业涂层和液滴发射。在这里,我们展示了表面粗糙度何时以及如何促进亲水表面上移动接触线的不稳定。除了维持稳定的润湿界面的驱动力和粘性阻力的平衡之外,润湿失效会发生并被表面粗糙度所改变。仅当润湿速度足够高以在移动接触线附近形成气-液-固复合界面时才会产生促进效果,并且它是固有接触角和固体顶部比例的函数。我们提出了一个模型来解释粗糙固体球撞击液体的飞溅。它揭示了一个新概念,即亲水粗糙表面上的动态润湿可以与疏水表面上的动态润湿相似,并为设计具有特定润湿特性的表面提供了一种新方法。
Wetting failure is of vital importance to many physical phenomena, such as industrial coating and drop emission. Here we show when and how the surface roughness promotes the destabilization of a moving contact line on a hydrophilic surface. Beyond the balance of the driving force and viscous resistance where a stable wetting interface is sustained, wetting failure occurs and is modified by the roughness of the surface. The promoting effect arises only when the wetting velocity is high enough to create a gas-liquid-solid composite interface in the vicinity of the moving contact line and it is a function of the intrinsic contact angle and proportion of solid tops. We propose a model to explain splashes of rough solid spheres impacting into liquids. It reveals a novel concept that dynamic wetting on hydrophilic rough surfaces can be similar to that on hydrophobic surfaces and brings a new way to design surfaces with specific wetting properties.
DOI: 10.1038/35102108
发表时间: 2001-11-01
期刊: NATURE
影响因子: 64.8
作者:
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