Highly nonlinear dynamics in a slowly sedimenting colloidal gel - Archive ouverte HAL
Article Dans Une Revue Physical Review Letters Année : 2011

Highly nonlinear dynamics in a slowly sedimenting colloidal gel

Giovanni Brambilla
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Ludovic Berthier
Luca Cipelletti

Résumé

We use a combination of original light scattering techniques and particles with unique optical properties to investigate the behavior of suspensions of attractive colloids under gravitational stress, following over time the concentration profile, the velocity profile, and the microscopic dynamics. During the compression regime, the sedimentation velocity grows nearly linearly with height, implying that the gel settling may be fully described by a (time-dependent) strain rate. We find that the microscopic dynamics exhibit remarkable scaling properties when time is normalized by strain rate, showing that the gel microscopic restructuring is dominated by its macroscopic deformation.
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Dates et versions

hal-00569378 , version 1 (24-02-2011)

Identifiants

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Giovanni Brambilla, Stefano Buzzaccaro, R. Piazza, Ludovic Berthier, Luca Cipelletti. Highly nonlinear dynamics in a slowly sedimenting colloidal gel. Physical Review Letters, 2011, 106, pp.118302. ⟨10.1103/PhysRevLett.106.118302⟩. ⟨hal-00569378⟩
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