Ref HAL: hal-00569378_v1
Ref Arxiv: 1102.5172
DOI: 10.1103/PhysRevLett.106.118302
WoS: 000288326700015
Ref. & Cit.: NASA ADS
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45 Citations
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.