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The phase stacking diagram of colloidal mixtures under gravity

Title data

de las Heras, Daniel ; Schmidt, Matthias:
The phase stacking diagram of colloidal mixtures under gravity.
In: Soft Matter. Vol. 9 (2013) Issue 36 . - pp. 8636-8641.
ISSN 1744-6848
DOI: https://doi.org/10.1039/C3SM51491A

Official URL: Volltext

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Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics II > Chair Theoretical Physics II - Univ.-Prof. Dr. Matthias Schmidt
Profile Fields > Advanced Fields > Polymer and Colloid Science
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics II
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 13 Mar 2015 07:15
Last Modified: 13 Mar 2015 07:15
URI: https://eref.uni-bayreuth.de/id/eprint/8109