Internal-Flow-Mediated, Tunable One-dimensional Cassie-to-Wenzel Wetting Transition on Superhydrophobic Microcavity Surfaces during Evaporation

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Nanoscale and Microscale Thermophysical Engineering Pub Date : 2019-08-30 DOI:10.1080/15567265.2019.1660439

P. Pendyala, H. Kim, H. Grewal, Uikyu Chae, Sungwook Yang, Il-Joo Cho, Simon Song, E. Yoon

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引用次数: 3

Abstract

ABSTRACT Superhydrophobic textured surfaces are known to maintain a nonwetted state unless external stimuli are applied since they can withstand high wetting pressure. Herein, we report a new category of tunable, one-dimensional (1D) Cassie-to-Wenzel wetting transitions during evaporation, even on superhydrophobic surfaces. The transition initiates at the periphery of the evaporating drop, and the wetting transition propagates toward the center of the drop. The transitions are observed for surfaces with wetting pressures as high as ~ 7,568 Pa, which is much higher than the Laplace pressure, i.e., ~200 Pa. In situ high-contrast fluorescence microscopy images of the evaporating drop show that the transition is induced by preferential depinning of the air-water interface and subsequent formation of air bubbles in the cavities near the three-phase contact line. The evaporation-induced internal flow enhances the pressure within the water droplet and subsequently causes a Cassie-to-Wenzel wetting transition.

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超疏水微腔表面蒸发过程中内部流动介导的可调一维Cassie-to-Wenzel润湿转变

众所周知，超疏水纹理表面可以承受高润湿压力，因此除非施加外部刺激，否则它们可以保持非润湿状态。在此，我们报告了一种新的可调，一维(1D) Cassie-to-Wenzel润湿转变在蒸发过程中，甚至在超疏水表面上。转变始于蒸发液滴的外围，湿润转变向液滴中心扩散。当润湿压力高达~ 7,568 Pa时，观察到表面的转变，该压力远高于拉普拉斯压力，即~200 Pa。蒸发滴的原位高对比度荧光显微镜图像显示，这种转变是由空气-水界面的优先脱落和随后在三相接触线附近的空腔中形成气泡引起的。蒸发引起的内部流动增加了水滴内部的压力，从而导致Cassie-to-Wenzel润湿转变。

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来源期刊

Nanoscale and Microscale Thermophysical Engineering 工程技术-材料科学：表征与测试

CiteScore

5.90

自引率

2.40%

发文量

审稿时长

3.3 months

期刊介绍： Nanoscale and Microscale Thermophysical Engineering is a journal covering the basic science and engineering of nanoscale and microscale energy and mass transport, conversion, and storage processes. In addition, the journal addresses the uses of these principles for device and system applications in the fields of energy, environment, information, medicine, and transportation. The journal publishes both original research articles and reviews of historical accounts, latest progresses, and future directions in this rapidly advancing field. Papers deal with such topics as: transport and interactions of electrons, phonons, photons, and spins in solids, interfacial energy transport and phase change processes, microscale and nanoscale fluid and mass transport and chemical reaction, molecular-level energy transport, storage, conversion, reaction, and phase transition, near field thermal radiation and plasmonic effects, ultrafast and high spatial resolution measurements, multi length and time scale modeling and computations, processing of nanostructured materials, including composites, micro and nanoscale manufacturing, energy conversion and storage devices and systems, thermal management devices and systems, microfluidic and nanofluidic devices and systems, molecular analysis devices and systems.