Ven 21.09.2012 11:30 Petite Salle du L2C, Bâtiment 13, 1 Etage
LE MERRER Marie (Université Paris 6) Viscous dissipation at interfaces: threads and bubbles (Matière Molle)
We study in different experiments the link between viscous dissipation and interfaces. First, we investigate the deformations of viscous threads under compression, which we compare to the buckling of elastic rods. In the second part, we study the dynamics of bubbles in wet foams, close to the jamming point. Bubble rearrangements in coarsening foams are investigated with a multiple light scattering probe. Their duration appears very dependent on interfacial rigidity (tuned by surfactant physico-chemistry) and confinement pressure, i.e. distance to jamming. We also study how bubble layers slide along an inclined plane, providing insight on the mechanisms of wall slip for foams in the wet limit.