Publikation: Dynamic Solid Surface Tension Causes Droplet Pinning and Depinning
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Physical Review Letters. American Physical Society (APS). 2018, 121(20), 208003. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/physrevlett.121.208003
Zusammenfassung
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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VAN GORCUM, Mathijs, Bruno ANDREOTTI, Jacco H. SNOEIJER, Stefan KARPITSCHKA, 2018. Dynamic Solid Surface Tension Causes Droplet Pinning and Depinning. In: Physical Review Letters. American Physical Society (APS). 2018, 121(20), 208003. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/physrevlett.121.208003BibTex
@article{vanGorcum2018Dynam-67430,
year={2018},
doi={10.1103/physrevlett.121.208003},
title={Dynamic Solid Surface Tension Causes Droplet Pinning and Depinning},
number={20},
volume={121},
issn={0031-9007},
journal={Physical Review Letters},
author={van Gorcum, Mathijs and Andreotti, Bruno and Snoeijer, Jacco H. and Karpitschka, Stefan},
note={Article Number: 208003}
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<dcterms: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.</dcterms:abstract>
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