Drops sitting on a tilted plate: Receding and advancing pinning

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题名:	Drops sitting on a tilted plate: Receding and advancing pinning
作者:	曹恆光;Chou, Tung-He;Hong, Siang-Jie;Sheng, Yu-Jane;Tsao, Heng-Kwong
贡献者:	工學院化學工程與材料工程學系
关键词:	Chemistry;contact angle;deformation;Exact sciences and technology;General and physical chemistry;Gibbs free energy;liquids;mathematical models;Solid-liquid interface;Surface physical chemistry;surface tension
日期:	2012-03-20
上传时间:	2026-04-21 13:53:27 (UTC+8)
出版者:	American Chemical Society;Washington, DC: American Chemical Society
摘要:	摘要： The wetting behavior of a liquid drop sitting on an inclined plane is investigated experimentally and theoretically. Using Surface Evolver, the numerical simulations are performed based on the liquid-induced defect model, in which only two thermodynamic parameters (solid–liquid interfacial tensions before and after wetting) are required. A drop with contact angle (CA) equal to θ is first placed on a horizontal plate, and then the plate is tilted. Two cases are studied: (i) θ is adjusted to the advancing CA (θa) before tilting, and (ii) θ is adjusted to the receding CA (θr) before tilting. In the first case, the uphill CA declines and the downhill CA remains unchanged upon inclination. When the tilted drop stays at rest, the pinning of the receding part of the contact line (receding pinning) and the depinning of the advancing part of the contact line (advancing depinning) are observed. The free energy analysis reveals that upon inclination, the reduction of the solid–liquid free energy dominates over the increment of the liquid–gas free energy associated with shape deformation. In the second case, the downhill CA grows and the uphill CA remains the same upon inclination. Advancing pinning and receding depinning are noted for the tilted drop at rest. The free energy analysis indicates that upon inclination, the decrease of the liquid–gas free energy compensates the increment of the solid–liquid free energy. The experimental results are in good agreement with those of simulations. 其他題名： Langmuir 出版者： Washington, DC: American Chemical Society 出版日期： 2012-03-20 出處： Langmuir, 2012-03, Vol.28 (11), p.5158-5166 資源來源： ACS:American Chemical Society 版權： Copyright © 2012 American Chemical Society 版權： 2015 INIST-CNRS 識別號： ISSN: 0743-7463 識別號： ISSN: 1520-5827 識別號： EISSN: 1520-5827 識別號： DOI: 10.1021/la300257t 識別號： PMID: 22372858 識別號： CODEN: LANGD5
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