Factors controlling the pinning force of liquid droplets on liquid infused surfaces.,Soft Matter

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Factors controlling the pinning force of liquid droplets on liquid infused surfaces.
Soft Matter ( IF 2.9 ) Pub Date : 2020-07-24 , DOI: 10.1039/d0sm00766h
Muhammad Subkhi Sadullah ₁ , Jack R Panter ₁ , Halim Kusumaatmaja ₁

Affiliation

Liquid infused surfaces with partially wetting lubricants have recently been exploited for numerous intriguing applications, such as for droplet manipulation, droplet collection and spontaneous motion. When partially wetting lubricants are used, the pinning force is a key factor that can strongly affect droplet mobility. Here, we derive an analytical prediction for contact angle hysteresis in the limit where the meniscus size is much smaller than the droplet, and numerically study how it is controlled by the solid fraction, the lubricant wetting angles, and the various fluid surface tensions. We further relate the contact angle hysteresis and the pinning force experienced by a droplet on a liquid infused surface, and our predictions for the critical sliding angles are consistent with existing experimental observations. Finally, we discuss why a droplet on a liquid infused surface with partially wetting lubricants typically experiences stronger pinning compared to a droplet on a classical superhydrophobic surface.

中文翻译：

控制液滴在输液表面上的钉扎力的因素。

具有部分润湿的润滑剂的液体注入表面最近已被用于许多有趣的应用中，例如用于液滴操纵，液滴收集和自发运动。当使用部分润湿的润滑剂时，钉扎力是会严重影响液滴流动性的关键因素。在这里，我们得出了弯月面尺寸比液滴小得多的极限中的接触角滞后的分析预测，并数值研究了它是如何由固体分数，润滑剂润湿角和各种流体表面张力控制的。我们进一步将接触角滞后与液滴在液体注入表面上所经历的钉扎力相关联，我们对临界滑动角的预测与现有的实验观察结果一致。最后，

更新日期：2020-09-16

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