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Complex behavior of colloidal suspensions under
shear: dynamics investigation through light scattering
techniques.

Abstract : The aim of this experimental work is to
characterize, through light scattering techniques, the dynamics of
some colloidal systems exhibiting a complex rheological behaviour.
The thesis is developed around two topics: rejuvenation and shear
banding in a glassy colloidal system, and the jamming phenomenon
in a concentrated suspension of charged particles. In a Laponite
suspension -a model system for glassy colloidal systems- the
competition between shear rejuvenation and aging have been
investigated during the flow, while two regimes of aging have been
evidenced after flow cessation. Shear localization have been
observed at low shear rates by monitoring the velocity profiles
and a stick-slip behaviour has been evidenced by the oscillations
of the banded velocity profile. In a concentrated suspension of
silica particles in the jamming regime, we have investigated the
dynamics of flow-induced structures. The presence of particles
moving slower than at rest has been evidenced during the flow and
the relaxation of the particle dynamics has been studied after
flow cessation as a function of the applied shear stress.
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https://tel.archives-ouvertes.fr/tel-00142056
Contributor : Francesca Ianni <>
Submitted on : Tuesday, April 17, 2007 - 11:16:57 AM
Last modification on : Thursday, December 10, 2020 - 10:51:54 AM
Long-term archiving on: : Friday, September 21, 2012 - 2:10:34 PM

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  • HAL Id : tel-00142056, version 1

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Francesca Ianni. Complex behavior of colloidal suspensions under
shear: dynamics investigation through light scattering
techniques.. Data Analysis, Statistics and Probability [physics.data-an]. Università degli studi di Roma I; Université Pierre et Marie Curie - Paris VI, 2007. English. ⟨tel-00142056⟩

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