A drop pinned by a designed patch on a tilted superhydrophobic surface: Mimicking desert beetle

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Title:	A drop pinned by a designed patch on a tilted superhydrophobic surface: Mimicking desert beetle
Authors:	曹恆光;Hong, Siang-Jie;Chang, Cheng-Chung;Chou, Tung-He;Sheng, Yu-Jane;Tsao, Heng-Kwong
Contributors:	工學院化學工程與材料工程學系
Keywords:	Biological and medical sciences;Condensed matter: structure, mechanical and thermal properties;Exact sciences and technology;Medical sciences;Physics;Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects);Solid-fluid interfaces;Surfaces and interfaces;thin films and whiskers (structure and nonelectronic properties);Technology. Biomaterials. Equipments. Material. Instrumentation;Wetting
Date:	2012-12-20
Issue Date:	2026-04-21 14:04:53 (UTC+8)
Publisher:	American Chemical Society;Columbus, OH: American Chemical Society
Abstract:	摘要： A desert beetle tilts its body forward into the fog-laden wind to collect water by the hydrophilic patches on its superhydrophobic back. In this study, the pinning and dewetting mechanism of a tilted drop pinned by a designed patch on a superhydrophobic surface with negligible contact angle hysteresis (CAH) is explored both experimentally and theoretically. The patch is designed in different shapes including square, rectangle, and triangle. For a square or rectangular patch, the uphill contact angle (CA) of the tilted drop vary with the inclined angle (α) of the plate. The drop remains pinned until the critical inclined angle (αc) is achieved. As α = αc, the uphill CA of the drop reduces to the receding angle of the patch. The magnitude of αc grows approximately linearly with the pinning length (ωp), which is related to the patch size. It is found that ωp equals the side length (w) of square or rectangular patch perpendicular to the sliding direction. While ωp on square patches remains essentially unchanged before sliding, ωp on the triangular patch grows with increasing α. However, the relation between sin(α) and ωp for the triangular patch is consistent with that between sin(αc) and w for square and rectangular patches. Surface evolver simulations based on free energy minimization are performed to reproduce the wetting and dewetting behavior. The simulation outcomes agree quite well with the experimental results. 其他題名： J. Phys. Chem. C 出版者： Columbus, OH: American Chemical Society 出版日期： 2012-12-20 出處： Journal of physical chemistry. C, 2012-12, Vol.116 (50), p.26487-26495 資源來源： American Chemical Society Journals 版權： Copyright © 2012 American Chemical Society 版權： 2014 INIST-CNRS 識別號： ISSN: 1932-7447 識別號： EISSN: 1932-7455 識別號： DOI: 10.1021/jp310482y
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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