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18 April 2024 |
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Equilibrium concentration profiles and sedimentation kinetics of colloidal gels under gravitational stress | Stefano Buzzaccaro
; Eleonora Secchi
; Giovanni Brambilla
; R. Piazza
; Luca Cipelletti
; | Date: |
29 Feb 2012 | Abstract: | We study the sedimentation of colloidal gels by using a combination of light
scattering, polarimetry and video imaging. The asymptotic concentration
profiles $varphi(z,t
ightarrow infty)$ exhibit remarkable scaling
properties: profiles for gels prepared at different initial volume fractions
and particle interactions can be superimposed onto a single master curve by
using suitable reduced variables. We show theoretically that this behavior
stems from a power law dependence of the compressive elastic modulus
extit{vs} $varphi$, which we directly test experimentally. The sedimentation
kinetics comprises an initial latency stage, followed by a rapid collapse where
the gel height $h$ decreases at constant velocity, and a final compaction stage
characterized by a stretched exponential relaxation of $h$ towards a plateau.
Analogies and differences with previous works are briefly discussed. | Source: | arXiv, 1202.6474 | Services: | Forum | Review | PDF | Favorites |
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