Planar selective Leidenfrost propulsion without physically structured substrates or walls
Planar selective Leidenfrost propulsion without physically structured substrates or walls
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DOI：
10.1063/5.0017699
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发表时间：
2020-08-24
影响因子：
4
通讯作者：
Wood, David
中科院分区：
文献类型：
--
作者：
Dodd, Linzi E.;Agrawal, Prashant;Wood, David
莱顿弗罗斯特效应允许液滴在过热基底上方的几乎无摩擦的蒸汽层上传输。通常使用减成法技术对基材进行形貌结构化，以产生锯齿、人字形和其他图案，并进行整体加热，从而导致能耗和受控操作方面的重大挑战。在这里，我们提出了一种平面光刻方法来悬浮和推进液滴使用温度分布，这可以在空间上图案化和控制的时间。我们表明，微图案化的电极可以被加热，并提供控制的压力分布和蒸汽流量。使用这些几乎没有特征的平面基底，我们实现了液滴的自导向运动，速度约为30 μ m（-1），而没有形貌结构化基底或引入物理壁。我们的方法有可能被集成到应用程序中，如数字微流体，其中无摩擦和非接触式液滴运输可能是有利的。(C)2020年作者。除非另有说明，否则所有文章内容均根据知识共享署名（CC BY）许可证（http：//creativecommons.org/licenses/by/4.0/）进行许可。
The Leidenfrost effect allows droplets to be transported on a virtually frictionless layer of vapor above a superheated substrate. The substrates are normally topographically structured using subtractive techniques to produce saw-tooth, herringbone, and other patterns and bulk heated, leading to significant challenges in energy consumption and controlled operation. Here, we propose a planar lithographic approach to levitate and propel droplets using temperature profiles, which can be spatially patterned and controlled in time. We show that micro-patterned electrodes can be heated and provide control of the pressure profile and the vapor flow. Using these almost featureless planar substrates, we achieve self-directed motion of droplets, with velocities of approximately 30 mms(-1), without topographically structuring the substrate or introducing physical walls. Our approach has the potential to be integrated into applications, such as digital microfluidics, where frictionless and contactless droplet transport may be advantageous. (C) 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).