Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session R61: Steerable Colloids I
8:00 AM–11:00 AM,
Thursday, March 7, 2019
BCEC
Room: 258B
Sponsoring
Units:
GSOFT DFD
Chair: Naomi Oppenheimer, Simons Foundation
Abstract: R61.00008 : Shear Induced Particle Migration in Locally Driven Brownian Suspensions
9:48 AM–10:00 AM
Presenter:
Ilya Svetlizky
(School of Chemistry, Tel Aviv University)
Authors:
Ilya Svetlizky
(School of Chemistry, Tel Aviv University)
Yael Roichman
(School of Chemistry, Tel Aviv University)
While complex fluids are traditionally studied by imposing bulk forces on a macroscopic samples, here we explore the response of a colloidal dispersion to a local, microscopic driving; a microscale version of rheometry. In particular, we examine the response of a two dimensional layer of Brownian particles to a flow field induced by a circular motion of a probe particle driven by optical tweezers. We observe that particles migrate from high to low strain rate regions and form strong gradients in the density profiles. This non-homogeneity in the density profile is localized and the emerging length scale is set by the competition between the Brownian and shear forces. We further demonstrate that our measurements are quantitatively described, over a large range of strain rates and particle densities, by a phenomenological two phase fluid constitutive model previously discussed in the literature.
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