TY - JOUR

T1 - Far-from-equilibrium sheared colloidal liquids

T2 - Disentangling relaxation, advection, and shear-induced diffusion

AU - Lin, Neil Y C

AU - Goyal, Sushmit

AU - Cheng, Xiang

AU - Zia, Roseanna N.

AU - Escobedo, Fernando A.

AU - Cohen, Itai

N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.

PY - 2013/12/18

Y1 - 2013/12/18

N2 - Using high-speed confocal microscopy, we measure the particle positions in a colloidal suspension under large-amplitude oscillatory shear. Using the particle positions, we quantify the in situ anisotropy of the pair-correlation function, a measure of the Brownian stress. From these data we find two distinct types of responses as the system crosses over from equilibrium to far-from-equilibrium states. The first is a nonlinear amplitude saturation that arises from shear-induced advection, while the second is a linear frequency saturation due to competition between suspension relaxation and shear rate. In spite of their different underlying mechanisms, we show that all the data can be scaled onto a master curve that spans the equilibrium and far-from-equilibrium regimes, linking small-amplitude oscillatory to continuous shear. This observation illustrates a colloidal analog of the Cox-Merz rule and its microscopic underpinning. Brownian dynamics simulations show that interparticle interactions are sufficient for generating both experimentally observed saturations.

AB - Using high-speed confocal microscopy, we measure the particle positions in a colloidal suspension under large-amplitude oscillatory shear. Using the particle positions, we quantify the in situ anisotropy of the pair-correlation function, a measure of the Brownian stress. From these data we find two distinct types of responses as the system crosses over from equilibrium to far-from-equilibrium states. The first is a nonlinear amplitude saturation that arises from shear-induced advection, while the second is a linear frequency saturation due to competition between suspension relaxation and shear rate. In spite of their different underlying mechanisms, we show that all the data can be scaled onto a master curve that spans the equilibrium and far-from-equilibrium regimes, linking small-amplitude oscillatory to continuous shear. This observation illustrates a colloidal analog of the Cox-Merz rule and its microscopic underpinning. Brownian dynamics simulations show that interparticle interactions are sufficient for generating both experimentally observed saturations.

UR - http://www.scopus.com/inward/record.url?scp=84891790974&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84891790974&partnerID=8YFLogxK

U2 - 10.1103/PhysRevE.88.062309

DO - 10.1103/PhysRevE.88.062309

M3 - Article

AN - SCOPUS:84891790974

VL - 88

JO - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

JF - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

SN - 1539-3755

IS - 6

M1 - 062309

ER -