Highly nonlinear dynamics in a slowly sedimenting colloidal gel
arXiv:1102.5172 · doi:10.1103/PhysRevLett.106.118302
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 strain rate, showing that the gel microscopic restructuring is dominated by its macroscopic deformation.
Physical Review Letters (2011) xxxx
References in corpus (4)
- Colloidal Gels: Equilibrium and Non-Equilibrium Routes
- Three-dimensional imaging of colloidal glasses under steady shear
- Resolving long-range spatial correlations in jammed colloidal systems using photon correlation imaging
- The Role of Solid Friction in the Sedimentation of Strongly Attractive Colloidal Gels
Cited by in corpus (19)
- Sudden collapse of a colloidal gel
- Strong and weak chaos in weakly nonintegrable many-body Hamiltonian systems
- Avalanche-like fluidization of a non-Brownian particle gel
- Nonequilibrium Ornstein-Zernike relation for Brownian many-body dynamics
- Floating nematic phase in colloidal platelet-sphere mixtures
- Compressive consolidation of strongly aggregated particle gels
- Simultaneous measurement of the microscopic dynamics and the mesoscopic displacement field in soft systems by speckle imaging
- Space-resolved diffusing wave spectroscopy measurements of the macroscopic deformation and the microscopic dynamics in tensile strain tests
- Analogies between growing dense active matter and soft driven glasses
- Modelling a Hydrodynamic Instability in Freely Settling Colloidal Gels
- Equilibrium concentration profiles and sedimentation kinetics of colloidal gels under gravitational stress
- Simultaneous concentration and velocity maps in particle suspensions under shear from rheo-ultrasonic imaging
- Soft repulsive mixtures under gravity: brazil-nut effect, depletion bubbles, boundary layering, nonequilibrium shaking
- Colloidal Brazil nut effect in microswimmer mixtures induced by motility contrast
- A double rigidity transition rules the fate of drying colloidal drops
- Micro-mechanical insights into the stress transmission in strongly aggregating colloidal gel
- Hydrodynamic Stability Criterion for Colloidal Gelation under Gravity
- Spatial stress correlations in strong colloidal gel
- Decoupling Structure and Elasticity in Colloidal Gels Under Isotropic Compression