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Relaxation of Aggregates in a Jamming Colloidal Suspension After Shear Cessation

Published online by Cambridge University Press:  01 February 2011

Francesca Ianni ,
David Lasne ,
Regis Sarcia  and
Pascal Hebraud
Francesca Ianni
Affiliation:
francesca.ianni@phys.uniroma1.it, SOFT-INFM-CNR, Universita' di Roma La Sapienza, P.le Aldo Moro, 2, Rome, 00185, Italy
David Lasne
Affiliation:
david.lasne@espci.fr, P.P.M.D. UMR 7615 ESPCI, 10, rue Vaquelin, Paris, N/A, 75231 Paris Cedex 05, France
Regis Sarcia
Affiliation:
regis.sarcia@espci.fr, P.P.M.D. UMR 7615 ESPCI, 10, rue Vaquelin, Paris, N/A, 75231 Paris Cedex 05, France
Pascal Hebraud
Affiliation:
Pascal.Hebraud@ipcms.u-strasbg.fr, P.P.M.D. UMR 7615 ESPCI, 10, rue Vaquelin, Paris, N/A, 75231 Paris Cedex 05, France
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Abstract

The reversible formation of aggregates in a shear thickening, concentrated colloidal suspension is investigated through speckle visibility spectroscopy, a dynamic light scattering technique recently introduced [1]. Formation of particle aggregates is observed in the jamming regime, and their relaxation after shear cessation is monitored as a function of the applied shear stress. The aggregate relaxation time increases when a larger stress is applied. Several phenomena have been proposed to interpret this behavior: an increase of the aggregate size, or a closer packing of the particles in the aggregates.

1. P.K. Dixon, D.J. Durian, Phys. Rev. Lett. 90, 184302 (2003).

Keywords

colloidfluidcluster assembly
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 942: Symposium W – Colloidal Materials – Synthesis, Structure, and Applications , 2006 , 0942-W09-10
Copyright
Copyright © Materials Research Society 2006

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References

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