液滴在柔软的拉伸基底上各向异性地滑动
Droplets sit and slide anisotropically on soft, stretched substrates
摘要：
各向异性润湿基底使得能够在一系列应用中有效地控制液滴行为。通常，这些涉及化学或物理图案化衬底表面，或应用温度或电场等性质的梯度。在这里，我们表明，一个平坦的，拉伸的，均匀的软基板也表现出不对称的润湿，无论是在如何液滴滑动，并在其静态形状。液滴动力学受到拉伸的强烈影响：在硅树脂基底上的甘油液滴，在平行于所施加拉伸的方向上比在垂直方向上拉伸滑动23\%快67\%。与经典的润湿理论相反，处于平衡状态的静态液滴呈细长状，取向平行于拉伸方向。这两种效应都是由接触线附近的基板的液滴引起的变形引起的。
英文摘要：
Anisotropically wetting substrates enable useful control of droplet behavior across a range of applications. Usually, these involve chemically or physically patterning the substrate surface, or applying gradients in properties like temperature or electrical field. Here, we show that a flat, stretched, uniform soft substrate also exhibits asymmetric wetting, both in terms of how droplets slide and in their static shape. Droplet dynamics are strongly affected by stretch: glycerol droplets on silicone substrates with a 23\% stretch slide 67\% faster in the direction parallel to the applied stretch than in the perpendicular direction. Contrary to classical wetting theory, static droplets in equilibrium appear elongated, oriented parallel to the stretch direction. Both effects arise from droplet-induced deformations of the substrate near the contact line.
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