Rheology of soft glassy materials

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...

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Bibliographic Details
Published in:Europhysics letters 2002-09, Vol.59 (5), p.786-792
Main Authors: Bonn, D, Coussot, P, Huynh, H. T, Bertrand, F, Debrégeas, G
Format: Article
Language:English
Subjects:
61.43.Fs
83.60.-a
83.80.Ab
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc
Material form
Physics
Rheology
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Summary: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.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2002-00195-4