Effects of interparticle attractions on colloidal sedimentation

A. Moncho-Jordá, A.A. Louis, J.T. Padding

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    We use a mesoscopic simulation technique to study the effect of short-ranged interparticle attractions on the steady-state sedimentation of colloidal suspensions. Attractions increase the average sedimentation velocity vs compared to the pure hard-sphere case, and for strong enough attractions, a nonmonotonic dependence on the packing fraction f with a maximum velocity at intermediate f is observed. Attractions also strongly enhance hydrodynamic velocity fluctuations, which show a pronounced maximum size as a function of f. These phenomena arise from a complex interplay between nonequilibrium hydrodynamic effects and the thermodynamics of transient cluster formation. © 2010 The American Physical Society.
    Original languageEnglish
    Article number068301
    Pages (from-to)068301-1/4
    JournalPhysical Review Letters
    Issue number6
    Publication statusPublished - 2010


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