Teil eines Buches,
Jamming of a concentrated colloidal suspension under flow
Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)
Zusammenfassung
When a concentrated colloidal suspension is forced to flow at high shear rates, clusters form, that jam the flow, and it becomes necessary to apply high stress values to make the suspension flow again1,2. We study here the fluctuations of the tangential and normal stress and their statistical properties under flow. We obtain that, at high concentrations, it becomes dilatant. Confocal imaging shows that, in that case, organized clusters of particles form, that are responsible for the jamming of the suspension. When the application of stress is stopped, the spatial distribution of the colloids slowly relaxes back to equilibrium. We have thus used diffusing wave spectroscopy to study the relaxation of the clusters after flow cessation3.
1)D.Lootens, H.van Damme, P.Hebraud Physical Review Letters, 90, 178301, 2003.\newline
2)D.Lootens, Y.Hemar, H.van Damme, P.Hebraud, Physical Review Letters 95, 268302, 2005.\newline
3)F.Ianni,D.Lasne, R.Sarcia,P.Hebraud Physical Review E 74, 011401, 2006
