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  Dynamic solid surface tension causes droplet pinning and depinning

van Gorcum, M., Andreotti, B., Snoeijer, J. H., & Karpitschka, S. A. (2018). Dynamic solid surface tension causes droplet pinning and depinning. Physical Review Letters, 121(20): 208003. doi:10.1103/PhysRevLett.121.208003.

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Genre: Journal Article

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 Creators:
van Gorcum, M., Author
Andreotti, B., Author
Snoeijer, J. H., Author
Karpitschka, Stefan A.1, 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 contact line of a liquid drop on a solid exerts a nanometrically sharp surface traction. This provides an unprecedented tool to study highly localized and dynamic surface deformations of soft polymer networks. One of the outstanding problems in this context is the stick-slip instability, observed above a critical velocity, during which the contact line periodically depins from its own wetting ridge. Time- resolved measurements of the solid deformation are challenging, and the mechanism of dynamical depinning has remained elusive. Here we present direct visualisations of the dynamic wetting ridge formed by water spreading on a PDMS gel. Unexpectedly, it is found that the opening angle of the wetting ridge increases with speed, which cannot be attributed to bulk rheology, but points to a dynamical increase of the solid ’ s surface tensions. From this we derive the criterion for depinning that is confirmed experimentally. Our findings reveal a deep connection between stick-slip processes and newly identified dynamical surface effects.

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Language(s): eng - English
 Dates: 2018-11-162018-11
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.121.208003
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Title: Physical Review Letters
Source Genre: Journal
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Pages: 5 Volume / Issue: 121 (20) Sequence Number: 208003 Start / End Page: - Identifier: ISSN: 0003-6951