Volume 65, Number 5, March 2004
|Page(s)||719 - 725|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 February 2004|
Sedimentation profiles of charged colloids: Entropic lift and charge separation
Debye Institute, Soft Condensed Matter, Utrecht University Princetonplein 5, 3584 CC Utrecht, The Netherlands
2 Institute for Theoretical Physics, Utrecht University Leuvenlaan 4, 3584 CE Utrecht, The Netherlands
Accepted: 5 January 2004
We present Molecular Dynamics simulations and Poisson-Boltzmann theory of sedimentation equilibrium of suspensions of charged colloids, treated at the level of the primitive model, including the co- and counterions (microions) explicitly. The simulations provide the first direct confirmation of the theoretical low-salt predictions of i) a macroscopic separation of colloidal and microionic charge, ii) an almost homogeneous electric field in the suspension, iii) a highly non-barometric colloid density distribution. These effects, which cannot be explained within the usual effective one-component picture, should be measurable experimentally.
PACS: 82.70.Dd – Colloids / 05.20.Jj – Statistical mechanics of classical fluids / 61.20.Ja – Computer simulation of liquid structure
© EDP Sciences, 2004
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