Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M37: Suspensions: Rheology
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B409
Chair: Harishankar Manikantan, UCSB
Abstract ID: BAPS.2018.DFD.M37.8
Abstract: M37.00008 : Attractive and Repulsive Particles: Relations Between Microstructure Formation and Yield Behavior of 2D Jammed Clays*
9:31 AM–9:44 AM
Presenter:
Larry Galloway
(University of Pennsylvania)
Authors:
Larry Galloway
(University of Pennsylvania)
Douglas Jerolmack
(University of Pennsylvania)
Paulo E. Arratia
(University of Pennsylvania)
To advance predictive models of bulk behavior of naturally occurring materials, such as clay or mud, it is important to understand the dynamics and structural properties of the material constituents (i.e. particles). Here, we investigate the flow and microstructure of clay suspensions using a custom made interfacial stress rheometer. This device measures suspension rheology (e.g. G’, G”) while simultaneously characterizing the fluid microstructure.
We find the development of system-spanning networks of attractive particles that cause jamming at lower concentrations as compared to repulsive systems. The role of reversibility in yielding of naturally occurring, complex materials is elucidated by studying a system of clay. Kaolinite, a non-swelling plate shaped clay is chosen because these particles have opposite charges on faces as edges, creating bulk attraction. We observe evolution of the microstructure in the form of system-spanning aggregates and persistent voids. Inter-particle attraction is believed to create these aggregates, which in turn impede shear. It is expected that elasticity grows steadily with shear frequency, but at a critical amplitude loss due to viscosity sets in.
*Research was sponsored by the Army Research Laboratory under Grant Number W911-NF-16-1-0290
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M37.8
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