Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2012-02-29
Physics
Condensed Matter
Soft Condensed Matter
This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics Condensed Matter
Scientific paper
We study the sedimentation of colloidal gels by using a combination of light scattering, polarimetry and video imaging. The asymptotic concentration profiles $\varphi(z,t\rightarrow \infty)$ 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 \textit{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.
Brambilla Giovanni
Buzzaccaro Stefano
Cipelletti Luca
Piazza Roberto
Secchi Eleonora
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