Relaxation of jammed colloidal suspensions after shear cessation

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Francesca Ianni,^1,2 David Lasne,^1,3 Régis Sarcia,¹ and Pascal Hébraud^1,4
¹P.P.M.D., UMR 7615 ESPCI, 10 rue Vauquelin 75231, Paris Cedex 05, France
²SOFT-INFM-CNR, c/o Università di Roma "La Sapienza," I-00185, Roma, Italy
³C.P.M.O.H., UMR 5798, 351 cours de la Libération, 33405 Talence, France
⁴IPCMS, UMR 7504, 23 rue du Loess 67034, Strasbourg Cedex 02, France

Received 5 December 2005; revised 12 May 2006; published 20 July 2006

Thedynamics of heterogeneities in a shear thickening, concentrated colloidal suspensionis investigated through speckle visibility spectroscopy, a dynamic light scatteringtechnique recently introduced [P. K. Dixon and D. J. Durian,Phys. Rev. Lett. 90, 184302 (2003)]. Formation of shear-induced heterogeneitiesis observed in the jamming regime, and their relaxation aftershear cessation is monitored as a function of the appliedshear stress. The relaxation time of these heterogeneities increases whena higher stress is applied.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.74.011401
DOI:	10.1103/PhysRevE.74.011401
PACS:	83.80.Hj; 83.85.Ei; 42.25.Fx 83.80.Hj Suspensions, dispersions, pastes, slurries, colloids (rheology) 83.85.Ei Optical methods; rheo-optics 42.25.Fx Optical diffraction and scattering YEAR: 2006
KEYWORDS:	colloids, suspensions, rheology, speckle, stress effects, visible spectra, light scattering

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