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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

  • This article is part of the themed collection: Colloids
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Publication details

The article was received on 21 Jun 2016, accepted on 23 Aug 2016 and first published on 25 Aug 2016


Article type: Paper
DOI: 10.1039/C6SM01427E
Citation: Soft Matter, 2016,12, 7764-7771
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    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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