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Tytuł:
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A generalized examination of capillary force balance at contact line: On rough surfaces or in two-liquid systems.
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Autorzy:
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Fan J; CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei 230027, China.
De Coninck J; Laboratory of Surface and Interfacial Physics (LPSI), University of Mons, 7000 Mons, Belgium.
Wu H; CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei 230027, China. Electronic address: .
Wang F; CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei 230027, China. Electronic address: .
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Źródło:
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Journal of colloid and interface science [J Colloid Interface Sci] 2021 Mar; Vol. 585, pp. 320-327. Date of Electronic Publication: 2020 Nov 30.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: Orlando, FL : Academic Press
Original Publication: New York.
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Contributed Indexing:
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Keywords: Capillary force; Contact angle; Contact line; Molecular dynamics simulations; Roughness; Surface tension; Wetting; Young’s equation
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Entry Date(s):
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Date Created: 20201210 Latest Revision: 20201229
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Update Code:
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20240104
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DOI:
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10.1016/j.jcis.2020.11.100
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PMID:
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33302048
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We investigate the capillary force balance at the contact line on rough solid surfaces and in two-liquid systems. Our results confirm that solid-liquid interactions perpendicular to the interface have a significant influence on the lateral component of the capillary force exerted on the contact line. Surface roughness of the solid substrate reduces the mobility of liquid and alters how the perpendicular solid-liquid interactions transfer into a force acting parallel to the interface. A quantitative relation between surface roughness and the transfer strategy is proposed. Moreover, when a liquid is in coexistence with another immiscible liquid on a solid, the capillary forces exerted on liquids of both sides are involved in our theoretical model. The contact angle can be predicted by calculating three interfacial tensions. These arguments are then verified by molecular dynamics simulations. Our findings set up the generalized theoretical framework for the capillary force balance at the contact line and broaden its application in more realistic scenarios.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
