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Continuous shear thickening transitions in model concentrated colloids - the role of interparticle forces

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Melrose, John R. and Ball, Robin (2004) Continuous shear thickening transitions in model concentrated colloids - the role of interparticle forces. Journal of Rheology, Vol.48 (No.5). pp. 937-960. doi:10.1122/1.1784783

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Official URL: http://dx.doi.org/10.1122/1.1784783

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Abstract

The role of interactions between close particles in the shear thickening of concentrated colloids is examined by using a Stokesian dynamics simulation of model systems. The interactions are repulsive thermodynamic forces and lubrication forces. Three different models are contrasted in their thickening behavior: Brownian spheres, polymer coated spheres, and Hookian spheres. Respectively, they show: a "mild" continuous thickening, a "strong" continuous thickening, and a strain thickening with loss of steady state. The relationship of order-disorder transitions and thickening is examined. Depending on the volume fraction and range of repulsive forces, thickening can be observed with or without an order-disorder transition at its onset. The different thickening responses arise from the dependence of the relaxation time of close particle contacts on interparticle gap. A time-scale based criterion for strong thickening is proposed and supported by the simulations. A simple theoretical model based the motion of a pair of particles leads to this criterion, but also predicts the mild thickening of Brownian spheres. It gives a simple fitting of flow curves which includes the details of the interparticle interactions. (C) 2004 The Society of Rheology.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Colloids, Shear flow -- Simulation methods, Rheology
Journal or Publication Title: Journal of Rheology
Publisher: Society of Rheology
ISSN: 0148-6055
Official Date: September 2004
Dates:
DateEvent
September 2004Published
Volume: Vol.48
Number: No.5
Number of Pages: 24
Page Range: pp. 937-960
DOI: 10.1122/1.1784783
Status: Peer Reviewed
Publication Status: Published

Data sourced from Thomson Reuters' Web of Knowledge

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