Highly nonlinear dynamics in a slowly sedimenting colloidal gel

Details Highly nonlinear dynamics in a slowly sedimenting colloidal gel Highly nonlinear dynamics in a slowly sedimenting colloidal gel

2011-02-25

arxiv.org/abs/1102.5172v1

Physical Review Letters 106 (2011) 118302

Physics

Condensed Matter

Soft Condensed Matter

Physical Review Letters (2011) xxxx

Scientific paper

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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