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Article Dans Une Revue Physical Review Fluids Année : 2017

Elastocapillary levelling of thin viscous films on soft substrates

Marco Rivetti
  • Fonction : Auteur
Vincent Bertin
Thomas Salez
Chung-Yuen Hui
  • Fonction : Auteur
Christine Linne
  • Fonction : Auteur
Maxence Arutkin
  • Fonction : Auteur
Haibin Wu
  • Fonction : Auteur
Elie Raphael
Oliver Bäumchen
  • Fonction : Auteur

Résumé

A thin liquid film with non-zero 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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Dates et versions

hal-03134691 , version 1 (08-02-2021)

Identifiants

Citer

Marco Rivetti, Vincent Bertin, Thomas Salez, Chung-Yuen Hui, Christine Linne, et al.. Elastocapillary levelling of thin viscous films on soft substrates. Physical Review Fluids, 2017, 2 (9), ⟨10.1103/PhysRevFluids.2.094001⟩. ⟨hal-03134691⟩

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