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  Elastocapillary levelling of thin viscous films on soft substrates

Rivetti, M., Bertin, V., Salez, T., Hui, C.-Y., Linne, C., Arutkin, M., et al. (2017). Elastocapillary levelling of thin viscous films on soft substrates. Physical Review Fluids, 2(9): 094001. doi:10.1103/PhysRevFluids.2.094001.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-DFF9-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-989B-4
Genre: Journal Article

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 Creators:
Rivetti, Marco1, Author              
Bertin, Vincent, Author
Salez, Thomas, Author
Hui, Chung-Yuen, Author
Linne, Christine1, Author              
Arutkin, Maxence, Author
Wu, Haibin, Author
Raphael, Elie, Author
Bäumchen, Oliver1, Author              
Affiliations:
1Group Dynamics of fluid and biological interfaces, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063300              

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Free keywords: Capillary interactions, Elastic forces, Free-surface flows, Interfacial flows, Lubrication, Nanoscale flows, Surface & interfacial phenomena, Aromic force microscopy, Navier-Stokes equation
 Abstract: A thin liquid film with nonzero curvature at its free surface spontaneously flows to reach a flat configuration, a process driven by Laplace pressure gradients and resisted by the liquid’s viscosity. Inspired by recent progresses on the dynamics of liquid droplets on soft substrates, we here study the relaxation of a viscous film supported by an elastic foundation. Experiments involve thin polymer films on elastomeric substrates, where the dynamics of the liquid-air interface is monitored using atomic force microscopy. A theoretical model that describes the coupled evolution of the solid-liquid and the liquid-air interfaces is also provided. In this soft-levelling configuration, Laplace pressure gradients not only drive the flow, but they also induce elastic deformations on the substrate that affect the flow and the shape of the liquid-air interface itself. This process represents an original example of elastocapillarity that is not mediated by the presence of a contact line. We discuss the impact of the elastic contribution on the levelling dynamics and show the departure from the classical self-similarities and power laws observed for capillary levelling on rigid substrates.

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Language(s): eng - English
 Dates: 2017-09-012017
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevFluids.2.094001
 Degree: -

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Title: Physical Review Fluids
Source Genre: Journal
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Pages: 13 Volume / Issue: 2 (9) Sequence Number: 094001 Start / End Page: - Identifier: ISSN: 2469-990X