Role of particle orientational order during shear thickening in suspensions of colloidal rods

Rathee, V and Arora, S and Blair, DL and Urbach, JS and Sood, AK and Ganapathy, R (2020) Role of particle orientational order during shear thickening in suspensions of colloidal rods. In: Physical Review E, 101 (4).

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Abstract

Rheology of dense anisotropic colloidal suspensions often exhibits unsteady flow at constant imposed shear stress and/or shear rate. Using simultaneous high-resolution confocal microscopy and rheology, we find that the temporal behavior arises due to a strong coupling between shear flow and particle orientation. At smaller applied stresses, the orientation of rods fluctuates around the flow direction. A transition to an intermittent disordered state is observed at higher stresses when the angle between the flow and the rod orientation reaches a critical value. This disordered state is associated with transient drop in shear rate and an increase in viscosity. Simultaneous visualization of boundary stresses and orientation shows that the disordered regions lead to heterogeneous stresses and positive normal forces at the boundary, indicating the formation of systems spanning disordered particle contact networks.

Item Type:	Journal Article
Publication:	Physical Review E
Publisher:	AMER PHYSICAL SOC
Additional Information:	The copyright of this article belongs to AMER PHYSICAL SOC
Keywords:	Elasticity; Shear deformation; Shear flow; Shear stress, Colloidal suspensions; Disordered regions; Disordered state; Orientational orderings; Particle contacts; Particle orientation; Shear thickening; Temporal behavior, Suspensions (fluids)
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	13 Aug 2020 06:38
Last Modified:	13 Aug 2020 06:38
URI:	http://eprints.iisc.ac.in/id/eprint/65497

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