Bidirectional motion of droplets on gradient liquid infused surfaces
Bidirectional motion of droplets on gradient liquid infused surfaces
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DOI：
10.1038/s42005-020-00429-8
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发表时间：
2020-09-21
影响因子：
5.5
通讯作者：
Kusumaatmaja, Halim
中科院分区：
文献类型：
--
作者：
Sadullah, Muhammad Subkhi;Launay, Gaby;Kusumaatmaja, Halim
目前，液滴在具有化学或地形润湿梯度的表面上的自推进运动的范例总是单向的。相比之下，在这里，我们展示了双向液滴运动，我们实现使用液体注入表面的地形梯度。沉积的液滴可以朝向更密集或更稀疏的固体部分区域移动。我们严格验证的双向现象，使用各种组合的液滴和润滑剂，和不同形式的结构/地形梯度，采用格子玻尔兹曼模拟和实验。我们还提出了一个简单和物理直观的分析理论，解释了双向运动的起源。决定液滴运动方向的关键因素是液滴在固体表面和润滑油膜上的润湿性差异。具有润湿梯度的表面上的液滴自推进与广泛的实际应用相关，并且这种运动通常是单向的。在这里，作者展示了如何在具有纹理梯度的液体注入表面上实现和控制液滴的双向运动。
The current paradigm of self-propelled motion of liquid droplets on surfaces with chemical or topographical wetting gradients is always mono-directional. In contrast, here, we demonstrate bidirectional droplet motion, which we realize using liquid infused surfaces with topographical gradients. The deposited droplet can move either toward the denser or the sparser solid fraction area. We rigorously validate the bidirectional phenomenon using various combinations of droplets and lubricants, and different forms of structural/topographical gradients, by employing both lattice Boltzmann simulations and experiments. We also present a simple and physically intuitive analytical theory that explains the origin of the bidirectional motion. The key factor determining the direction of motion is the wettability difference of the droplet on the solid surface and on the lubricant film.Droplet self-propulsion on surfaces with wetting gradients is relevant for wide-ranging practical applications, and such motion is typically unidirectional. Here, the authors show how bidirectional motion of droplets can be achieved and controlled on liquid-infused surfaces with texture gradients.