Volume 68, Number 1, October 2004
|Page(s)||120 - 126|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2004|
Colloidal Brazil-nut effect in sediments of binary charged suspensions
Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1, D-40225 Düsseldorf, Germany
Accepted: 30 July 2004
Equilibrium sedimentation density profiles of charged binary colloidal suspensions are calculated by computer simulations and density-functional theory. For deionized samples, we predict a colloidal “Brazil nut” effect: heavy colloidal particles sediment on top of the lighter ones provided that their mass per charge is smaller than that of the lighter ones. This effect is verifiable in settling experiments.
PACS: 82.70.Dd – Colloids / 61.20.Ja – Computer simulation of liquid structure / 05.20.Jj – Statistical mechanics of classical fluids
© EDP Sciences, 2004
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