Abstract
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 the strain rate, showing that the gel microscopic restructuring is dominated by its macroscopic deformation.
- Received 1 December 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.118302
© 2011 American Physical Society
Synopsis
Gels settle down
Published 18 March 2011
Light scattering measurements provide a microscopic picture of particle motion in a slowly sedimenting gel.
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