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Highly Nonlinear Dynamics in a Slowly Sedimenting Colloidal Gel by Brambilla, Giovanni; Buzzaccaro, Stefano; Piazza, R.; Berthier, Ludovic; Cipelletti, Luca is a scholarly article available to read on EtoBox.

What is Highly Nonlinear Dynamics in a Slowly Sedimenting Colloidal Gel about?

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.

Author

Brambilla, Giovanni; Buzzaccaro, Stefano; Piazza, R.; Berthier, Ludovic; Cipelletti, Luca

Published

2011

Language

EN