Journal
SOFT MATTER
Volume 10, Issue 44, Pages 8888-8895Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4sm01609b
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Funding
- labex SEAM (Science and Engineering for Advanced Materials), program Future Investment [ANR-11-LABX-086, ANR-11-IDEX-0005-02]
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We studied the dynamics of a liquid contact line receding on a hydrophobic soft gel (SBS-paraffin). In order to realize a well-defined geometry with an accurate control of velocity, a dip-coating setup was implemented. Provided that the elastic modulus is small enough, a significant deformation takes place near the contact line, which in turn drastically influences the wetting behaviour. Depending on the translation velocity of the substrate, the contact line exhibits different regimes of motions. Continuous motions are observed at high and low velocities, meanwhile two types of stick-slip motion - periodic and erratic - appear at intermediate velocities. We suggest that the observed transitions could be explained in terms of the competition between different frequencies, i.e., the frequency of the strain field variation induced by the contact line motion and the crossover frequency of the gel related to the material relaxation. Our results provide systematic views on how the wetting of liquid is modified by the rheological properties of a complex soft substrate.
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