Dynamics of triple lines at soft interfacesH. Gérardin, E. Verneuil, A. Constant, S. Dubois, J. Clain, X. Noblin, A. Buguin and F. Brochard-Wyart
Laboratoire de Physico-Chimie Curie, Institut Curie, CNRS UMR 168 11 rue Pierre et Marie Curie, 75248 Paris Cedex 05, France
received 6 January 2005; accepted in final form 7 June 2005
published online 13 July 2005
A rubber cylinder (R) is pressed against a glass plate (S) through a liquid drop (L). The liquid film, entrapped between R and S, dewets and a R/S dry contact, consisting in a band bordered by two straight contact lines, is formed. A row of equally spaced defects, graved on the glass plate, is used to pin and to deform periodically the R/L/S triple line. We observe the relaxation of this line by interference microscopy and we study the relaxation time vs. the period of the defects, the viscosity of the liquid, for hard and soft rubbers. A naive model, based on the balance between elastic and viscous forces, gives a plausible picture for these observations.
68.08.Bc - Wetting.
68.08.-p - Liquid-solid interfaces.
68.15.+e - Liquid thin films.
© EDP Sciences 2005