Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-10-05
Journal of Statistical Mechanics: Theory and Experiment (2007-02-09) P02010
Physics
Condensed Matter
Soft Condensed Matter
13 pages, 5 figures. Submitted to JSTAT
Scientific paper
10.1088/1742-5468/2007/02/P02010
We study experimentally and theoretically the sedimentation of gels made of strongly aggregated colloidal particles, focussing on the long time behavior, when mechanical equilibrium is asymptotically reached. The asymptotic gel height is found to vary linearly with the initial height, a finding in stark contrast with a recent study on similar gels [Manley \textit{et al.} 2005 \textit{Phys. Rev. Lett.} \textbf{94} 218302]. We show that the asymptotic compaction results from the balance between gravity pull, network elasticity, and solid friction between the gel and the container walls. Based on these ingredients, we propose a simple model to account for the dependence of the height loss on the initial height and volume fraction. As a result of our analysis, we show that the static friction coefficient between the gel and the container walls strongly depends on volume fraction: the higher the volume fraction, the weaker the solid friction. This nonintuitive behavior is explained using simple scaling arguments.
Cipelletti Luca
Condre Jean-Michel
Ligoure Christian
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