Coexistence of Pinning and Moving on a Contact Line
Name
Coexistence of Pinning with SI.pdf
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1.33 MB
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Author(s)
Lu, Zhengmao
Preston, Daniel John
Antao, Dion Savio
Zhu, Yangying
Wang, Evelyn
Date Issued
September 2017
Journal
Langmuir
Publisher
American Chemical Society (ACS)
Citation
Lu, Zhengmao et al. “Coexistence of Pinning and Moving on a Contact Line.” Langmuir 33, 36 (August 2017): 8970–8975 © 2017 American Chemical Society
Version
Author's final manuscript
Abstract
Textured surfaces are instrumental in water repellency or fluid wicking applications, where the pinning and depinning of the liquid–gas interface plays an important role. Previous work showed that a contact line can exhibit nonuniform behavior due to heterogeneities in surface chemistry or roughness. We demonstrate that such nonuniformities can be achieved even without varying the local energy barrier. Around a cylindrical pillar, an interface can reside in an intermediate state where segments of the contact line are pinned to the pillar top while the rest of the contact line moves along the sidewall. This partially pinned mode is due to the global nonaxisymmetric pattern of the surface features and exists for all textured surfaces, especially when superhydrophobic surfaces are about to be flooded or when capillary wicks are close to dryout.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/acs.langmuir.7b02070
