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Shear thickening and order–disorder effects in concentrated colloids at high shear rates

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Catherall, Alan A., Melrose, John R. and Ball, Robin (2000) Shear thickening and order–disorder effects in concentrated colloids at high shear rates. Journal of Rheology, Vol.44 (No.1). doi:10.1122/1.551072 ISSN 0148-6055.

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Official URL: http://dx.doi.org/10.1122/1.551072

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Abstract

The rheology and microstructure of concentrated colloidal suspensions, within the shear thickening regime, are investigated using Stokesian dynamics. We consider systems stabilized by charge and/or polymer layers, at hard core volume fractions above 40%. At ϕv=0.44, charge stabilized systems show transitions from ordered to disordered flow, with only a small increase in suspension viscosity. At higher ϕv, we observe larger jumps in viscosity with changes between order and disorder and vice versa. At high shear rates, interparticle gaps can become very small. This work investigates two ways in which these gaps may be controlled: by modifying the charge interaction potential [Dratler et al. (1997)], or by including a model for the presence of a polymer brush [Potanin and Russel (1995)]. The thickening observed is dependent on the gaps of closest approach of particles, but only weakly for hard sphere lubrication forces. Strong thickening is only observed with the presence of an enhanced lubricating force, in this article that due to a polymer coat. Models with polymer coats give examples of strong thickening within the disordered branch of flow. The effects of the number of particles used within these systems, the geometry of the computational box, and whether the simulation is two or three dimensional, can have a profound effect on the microstructure.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Rheology, Shear (Mechanics), Order-disorder models, Colloids
Journal or Publication Title: Journal of Rheology
Publisher: Society of Rheology
ISSN: 0148-6055
Official Date: 2000
Dates:
DateEvent
2000Published
Volume: Vol.44
Number: No.1
Number of Pages: 25
DOI: 10.1122/1.551072
Status: Peer Reviewed
Publication Status: Published

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