Self-similarity of contact line depinning from textured surfaces.
Self-similarity of contact line depinning from textured surfaces.
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DOI：
10.1038/ncomms2482
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发表时间：
2013
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
液滴在表面的流动性在许多生物和工业过程中是重要的，但由三相接触线的形态决定的控制其附着力的现象仍然不清楚。在这里，我们描述了一种使用环境扫描电子显微镜测量微米级三相接触线动态行为的技术。我们研究了超疏水表面，液滴在表面上的粘附性由后退接触线上的毛细管桥控制。测量了各桥的微尺度后退接触角，结果表明在微尺度上满足Gibbs准则。我们揭示了一种迄今未知的自相似脱钉机制，该机制显示了一些层次纹理(如荷叶)如何导致钉扎减少，以及一些层次纹理如何导致钉扎增加，这与直觉相反。我们开发了一个模型来预测粘附力，并通过实验验证了该模型在合成纹理表面和自然纹理表面上的广泛适用性。液滴在表面的运动是由附着力控制的，但微观机制尚不清楚。Paxson等人。想象液滴在曲面上移动时边缘的动态扭曲，使他们能够预测不同层次纹理曲面的润湿能力。
The mobility of drops on surfaces is important in many biological and industrial processes, but the phenomena governing their adhesion, which is dictated by the morphology of the three-phase contact line, remain unclear. Here we describe a technique for measuring the dynamic behaviour of the three-phase contact line at micron length scales using environmental scanning electron microscopy. We examine a superhydrophobic surface on which a drop’s adhesion is governed by capillary bridges at the receding contact line. We measure the microscale receding contact angle of each bridge and show that the Gibbs criterion is satisfied at the microscale. We reveal a hitherto unknown self-similar depinning mechanism that shows how some hierarchical textures such as lotus leaves lead to reduced pinning, and counter-intuitively, how some lead to increased pinning. We develop a model to predict adhesion force and experimentally verify the model’s broad applicability on both synthetic and natural textured surfaces. The motion of liquid drops on surfaces is governed by adhesion forces, but the microscopic mechanism is unclear. Paxson et al. image the dynamic distortion of the edge of a droplet as it moves across a surface, allowing them to predict the wetting ability of different hierarchically textured surfaces.
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