title: Rigidity percolation in particle-laden foams.
abstract: We study the viscoelastic behavior of aqueous foam mixed with solid noncolloidal particles. We show that adding a tiny amount of grains can enhance the elastic and loss shear moduli by more than 1 order of magnitude. The scaling of these moduli with solid volume fraction is in qualitative agreement with that predicted by an effective-medium rigidity percolation model. We present a simple model, based on capillary attraction, to explain the particle-size dependence of the threshold.
authors.affiliation: Université Paris-Est, Laboratoire de Physique des Matériaux Divisés et des Interfaces, UMR CNRS 8108, 5 Bd Descartes, 77454 Marne-la-Vallée cedex 2, France. sylvie.cohen-addad@univ-mlv.fr
authors.forename: Sylvie
authors.initials: S
authors.lastname: Cohen-Addad
authors.forename: Marcel
authors.initials: M
authors.lastname: Krzan
authors.forename: Reinhard
authors.initials: R
authors.lastname: Höhler
authors.forename: Benjamin
authors.initials: B
authors.lastname: Herzhaft