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Issue 22, 2015
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Modelling the rheology of anisotropic particles adsorbed on a two-dimensional fluid interface

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Abstract

We present a general approach based on nonequilibrium thermodynamics for bridging the gap between a well-defined microscopic model and the macroscopic rheology of particle-stabilised interfaces. Our approach is illustrated by starting with a microscopic model of hard ellipsoids confined to a planar surface, which is intended to simply represent a particle-stabilised fluid–fluid interface. More complex microscopic models can be readily handled using the methods outlined in this paper. From the aforementioned microscopic starting point, we obtain the macroscopic, constitutive equations using a combination of systematic coarse-graining, computer experiments and Hamiltonian dynamics. Exemplary numerical solutions of the constitutive equations are given for a variety of experimentally relevant flow situations to explore the rheological behaviour of our model. In particular, we calculate the shear and dilatational moduli of the interface over a wide range of surface coverages, ranging from the dilute isotropic regime, to the concentrated nematic regime.

Graphical abstract: Modelling the rheology of anisotropic particles adsorbed on a two-dimensional fluid interface

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Article information


Submitted
12 Feb 2015
Accepted
31 Mar 2015
First published
29 Apr 2015

Soft Matter, 2015,11, 4383-4395
Article type
Paper
Author version available

Modelling the rheology of anisotropic particles adsorbed on a two-dimensional fluid interface

A. M. Luo, L. M. C. Sagis, H. C. Öttinger, C. De Michele and P. Ilg, Soft Matter, 2015, 11, 4383
DOI: 10.1039/C5SM00372E

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