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  Spreading on viscoelastic solids: Are contact angles selected by Neumann's law?

van Gorcum, M., Karpitschka, S. A., Andreotti, B., & Snoeijer, J. H. (2020). Spreading on viscoelastic solids: Are contact angles selected by Neumann's law? Soft Matter, 16, 1306-1322. doi:10.1039/c9sm01453e.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-7B02-F Version Permalink: http://hdl.handle.net/21.11116/0000-0005-F1C3-E
Genre: Journal Article

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van Gorcum, M., Author
Karpitschka, Stefan A.1, Author              
Andreotti, B., Author
Snoeijer, J. H., Author
Affiliations:
1Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2466703              

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 Abstract: The spreading of liquid drops on soft substrates is extremely slow, owing to strong viscoelastic dissipation inside the solid. A detailed understanding of the spreading dynamics has remained elusive, partly owing to the difficulty in quantifying the strong viscoelastic deformations below the contact line that determine the shape of moving wetting ridges. Here we present direct experimental visualisations of the dynamic wetting ridge using shadowgraphic imaging, complemented with measurements of the liquid contact angle. It is observed that the wetting ridge exhibits a rotation that follows exactly the dynamic liquid contact angle - as was previously hypothesized [Karpitschka et al., Nat. Commun., 2015, 6, 7891]. This experimentally proves that, despite the contact line motion, the wetting ridge is still governed by Neumann's law. Furthermore, our experiments suggest that moving contact lines lead to a variable surface tension of the substrate. We therefore set up a new theory that incorporates the influence of surface strain, for the first time including the so-called Shuttleworth effect into the dynamical theory for soft wetting. It includes a detailed analysis of the boundary conditions at the contact line, complemented by a dissipation analysis, which shows, again, the validity of Neumann's balance.

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Language(s): eng - English
 Dates: 2019-12-262020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c9sm01453e
 Degree: -

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Title: Soft Matter
  Abbreviation : Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 16 Sequence Number: - Start / End Page: 1306 - 1322 Identifier: ISSN: 1744-683X
CoNE: https://pure.mpg.de/cone/journals/resource/1744-683X