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Issue 37, 2016
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Torsional stiffness determines aggregate structure in sheared colloidal rod suspensions

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Abstract

We report the results of simulations of suspensions of sheared rigid rods in the presence of strong attractive inter-particle interactions, using dissipative particle dynamics for a coarse-grained representation of the suspending fluid. We find that the combined effect of the attractive interactions and shear-induced alignment generically produces aggregates of aligned bundles when the contact points between rods are free to rotate. However, the introduction of substantial torsional stiffness to the inter-particle contacts recapitulates the disordered aggregates often observed in suspensions of high aspect ratio particles. We show that the degree of alignment within the aggregates depends on the strength of the torsional stiffness, while the stability of the aggregates and their impact on system viscosity depend on the competition between the attractive interaction and the shear stresses.

Graphical abstract: Torsional stiffness determines aggregate structure in sheared colloidal rod suspensions

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Article information


Submitted
21 Jun 2016
Accepted
23 Aug 2016
First published
25 Aug 2016

Soft Matter, 2016,12, 7764-7771
Article type
Paper

Torsional stiffness determines aggregate structure in sheared colloidal rod suspensions

J. T. Stimatze, D. A. Egolf and J. S. Urbach, Soft Matter, 2016, 12, 7764
DOI: 10.1039/C6SM01427E

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