Rheology and dynamics of sheared arrays of colloidal particles

Jeffrey J Gray, Roger T. Bonnecaze

Research output: Contribution to journalArticle

Abstract

Concentrated suspensions of colloidal particles undergo dynamical microstructural transitions under shear. During the transition from oscillating face-centered cubic twin structures to sliding layer structures, the system can exhibit hysteretic and discontinuous rheology as the shear rate is varied. We capture this behavior with a dynamic simulation of a sheared lattice of non-Brownian spherical particles with screened electrostatic interactions and hydrodynamic interactions determined using the Stokesian dynamics approximation. Rheological data are determined for a range of volume fractions, electrostatic screening lengths and shear rates or shear stresses. In controlled stress simulations, static yield stresses are observed. In controlled shear rate simulations of certain lattice orientations, plateau viscosities are observed at high and low shear rates with a high to low shear rate plateau viscosity ratio ranging from 1.4 to 2.2. Large viscosity transitions with hysteretic-like rheology are observed only in controlled shear rate simulations of face-centered cubic (111) layers sheared parallel to the (211) direction with full representation of the hydrodynamic particle interactions. Rheological curves collapse when stresses are scaled by the elastic modulus and shear rates by the elastic modulus divided by the high-shear-rate limiting viscosity. The magnitude of the hysteretic viscosity jump and the scaled critical stresses match experimental values.

Original languageEnglish (US)
Pages (from-to)1121-1151
Number of pages31
JournalJournal of Rheology
Volume42
Issue number5
StatePublished - Sep 1998
Externally publishedYes

Fingerprint

Rheology
rheology
Shear deformation
shear
Viscosity
viscosity
Hydrodynamics
Elastic moduli
plateaus
modulus of elasticity
simulation
hydrodynamics
electrostatics
Particle interactions
critical loading
Coulomb interactions
particle interactions
Yield stress
Shear stress
Electrostatics

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)

Cite this

Rheology and dynamics of sheared arrays of colloidal particles. / Gray, Jeffrey J; Bonnecaze, Roger T.

In: Journal of Rheology, Vol. 42, No. 5, 09.1998, p. 1121-1151.

Research output: Contribution to journalArticle

Gray, Jeffrey J ; Bonnecaze, Roger T. / Rheology and dynamics of sheared arrays of colloidal particles. In: Journal of Rheology. 1998 ; Vol. 42, No. 5. pp. 1121-1151.
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