2014/01/01 by Tadashi Kajiya, Philippe Brunet, Laurent Royon +3 · 44 citations
Engineering · Materials Science · Mathematics · Physics and Astronomy · #Adhesion, Friction, and Surface Interactions #Coating #Composite material #Contact angle #Dip-coating #Geometry #Line (geometry) #Materials science #Mathematics #Mechanics #Optics #Physics #Pickering emulsions and particle stabilization #Relaxation (psychology) #Rheology #Slip (aerodynamics) #Surface Modification and Superhydrophobicity #Thermodynamics #Wetting #cond-mat.soft #physics.flu-dyn
paper · pdf · doi:10.1039/c4sm01609b
published in Soft Matter 10(44), 8888-8895 (Royal Society of Chemistry) · 8 pages, 9 figures
openalex publication_date 2014/01/01 · arxiv created 2015/11/13 · arxiv updated 2015/11/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.