Volume 59, Number 5, September 2002
|Page(s)||786 - 792|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Rheology of soft glassy materials
Laboratoire de Physique Statistique, Ecole Normale Supérieure
24 Rue Lhomond, 75231 Paris Cedex 05, France
2 Laboratoire des Matériaux et des Structures du Génie Civil 2 Allée Kepler, 77420 Champs sur Marne, France
3 Institut Charles Sadron - 6 rue Boussingault, 67083 Strasbourg Cedex, France
Corresponding author: firstname.lastname@example.org
Accepted: 5 June 2002
We compare the linear and non-linear rheological properties of a typical soft glassy material, the colloidal glass of Laponite, with the predictions of recently developed rheological models based on glassy dynamics, in which particles are trapped in a free-energy landscape with many minima. We find qualitative agreement between theory and experiment for the linear visco-elastic properties. However, for the non-linear response, notably the viscosity under continuous shear flow, important qualitative differences are found. This shows that a developed flow affects the dynamics of relaxation of the material in a more complicated way than what is assumed in the models: not only does the flow alter the energy landscape, but it also modifies the effective temperature controlling the escape rate for a given energy barrier.
PACS: 83.60.-a – Material behavior / 61.43.Fs – Glasses / 83.80.Ab – Solids: e.g., composites, glasses, semicrystalline polymers
© EDP Sciences, 2002
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