Far-from-equilibrium sheared colloidal liquids: Disentangling relaxation, advection, and shear-induced diffusion
KAUST Grant NumberKUS-C1-018-02
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AbstractUsing 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. © 2013 American Physical Society.
CitationLin NYC, Goyal S, Cheng X, Zia RN, Escobedo FA, et al. (2013) Far-from-equilibrium sheared colloidal liquids: Disentangling relaxation, advection, and shear-induced diffusion. Phys Rev E 88. Available: http://dx.doi.org/10.1103/PhysRevE.88.062309.
SponsorsWe thank D. Koch, L. Archer, I. Procaccia, G. Henchel, E. Bochbinder, B. Leahy, and J. L. Silverberg for helpful conversations. This work was supported in part by Award No. KUS-C1-018-02 from King Abdullah University of Science and Technology; the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. ER46517 (X.C.); and the National Science Foundation CBET-PMP Award No. 1232666. F.A.E. is grateful for computer cycles supplied by the Extreme Science and Engineering Discovery Environment, which is supported by National Science Foundation Grant No. OCI-1053575.
PublisherAmerican Physical Society (APS)
JournalPhysical Review E
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