Trapping of drops by wetting defects.
Trapping of drops by wetting defects.
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DOI：
10.1038/ncomms4559
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发表时间：
2014-04-11
影响因子：
16.6
通讯作者：
Mugele, Frieder
中科院分区：
文献类型：
--
作者：
't Mannetje, Dieter;Ghosh, Somnath;Lagraauw, Rudy;Otten, Simon;Pit, Arjen;Berendsen, Christian;Zeegers, Jos;van den Ende, Dirk;Mugele, Frieder
控制水滴在固体表面上的运动在许多自然现象和技术过程中至关重要，包括雨滴的收集和去除，清洁技术和热交换器。固体表面的地形和化学不均匀性会产生钉扎力，可以捕获液滴并将其引导到所需的方向。在这里，我们确定一般的物理条件所需的捕获滑动滴在一个倾斜的平面上，配备了电可调的润湿缺陷。通过映射点质量的一维运动的液滴动力学，我们证明了捕获过程是由两个无量纲参数，捕获强度测量的驱动力的单位和粘性和惯性时间尺度之间的比率。涉及超疏水表面润湿缺陷的补充实验证明了这一概念的普遍适用性。此外，我们表明，电可调缺陷可以用来引导滑动滴沿着积极可切换的轨道，在微流体的潜在应用。 精确控制表面缺陷上的移动液滴对于微流体应用是必不可少的。在这里，作者正式提出了一个通用的规则来描述液滴捕获使用两个无量纲参数，并显示如何电可调缺陷引导微流体通道中的滑动液滴。
Controlling the motion of drops on solid surfaces is crucial in many natural phenomena and technological processes including the collection and removal of rain drops, cleaning technology and heat exchangers. Topographic and chemical heterogeneities on solid surfaces give rise to pinning forces that can capture and steer drops in desired directions. Here we determine general physical conditions required for capturing sliding drops on an inclined plane that is equipped with electrically tunable wetting defects. By mapping the drop dynamics on the one-dimensional motion of a point mass, we demonstrate that the trapping process is controlled by two dimensionless parameters, the trapping strength measured in units of the driving force and the ratio between a viscous and an inertial time scale. Complementary experiments involving superhydrophobic surfaces with wetting defects demonstrate the general applicability of the concept. Moreover, we show that electrically tunable defects can be used to guide sliding drops along actively switchable tracks—with potential applications in microfluidics. Precise control of moving droplets on surface defects is essential for microfluidic applications. Here the authors formalize a generic rule to describe droplet trapping using two dimensionless parameters and show how electrically tunable defects guide sliding drops in microfluidic channels.
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