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Issue 36, 2013

The phase stacking diagram of colloidal mixtures under gravity

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Abstract

The observation of stacks of distinct layers in a colloidal or liquid mixture in the sedimentation–diffusion equilibrium is a striking consequence of bulk phase separation. Drawing quantitative conclusions about the phase diagram is, however, very delicate. Here we introduce the Legendre transform of the chemical potential representation of the bulk phase diagram to obtain a unique stacking diagram of all possible stacks under gravity. Simple bulk phase diagrams generically lead to complex stacking diagrams. We apply the theory to a binary hard core platelet mixture with only two-phase bulk coexistence, and find that the stacking diagram contains six types of stacks with up to four distinct layers. These results can be tested experimentally in colloidal platelet mixtures. In general, an extended Gibbs phase rule determines the maximum number of sedimented layers as a function of the number of binodals and their inflection points.

Graphical abstract: The phase stacking diagram of colloidal mixtures under gravity

Article information


Submitted
28 May 2013
Accepted
25 Jul 2013
First published
31 Jul 2013

Soft Matter, 2013,9, 8636-8641
Article type
Paper

The phase stacking diagram of colloidal mixtures under gravity

D. D. L. Heras and M. Schmidt, Soft Matter, 2013, 9, 8636 DOI: 10.1039/C3SM51491A

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