title: Laponite: aging and shear rejuvenation of a colloidal glass.
abstract: We study the nonlinear rheological behavior and the microscopic particle dynamics for a colloidal glass, to see whether recently developed models for driven glassy systems can be applied to predict the rheology. Qualitatively, all the findings predicted by the models can be retrieved in our system. Notably, the viscosity decreases strongly with the shear rate. Since it is difficult to predict non-Newtonian viscosities of colloidal systems due to long-ranged hydrodynamic interactions, this shows the promise of this approach for predicting flow behavior. In addition, the measurements allow us to relate the microscopic diffusion dynamics to the macroscopic viscosity of the system.
authors.affiliation: Laboratoire de Physique Statistique, Ecole Normale Supérieure, 24, rue Lhomond, 75005 Paris, France. bonn@lps.ens.fr
authors.forename: Daniel
authors.initials: D
authors.lastname: Bonn
authors.forename: Sorin
authors.initials: S
authors.lastname: Tanase
authors.forename: Bérengère
authors.initials: B
authors.lastname: Abou
authors.forename: Hajime
authors.initials: H
authors.lastname: Tanaka
authors.forename: Jacques
authors.initials: J
authors.lastname: Meunier