2002/10/29 by Virgile Viasnoff, V. Viasnoff, Viasnoff, V. +6
Computer Science · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Liquid Crystal Research Advancements #Material Dynamics and Properties #Nonlinear Dynamics and Pattern Formation #Soft Condensed Matter (cond-mat.soft) #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.cond-mat/0210636
9 pages 10 figures to appear in Faraday Discussion 123
arxiv created 2002/10/29 · openalex publication_date 2002/10/29 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present here a microscopic study of the effect of shear on a dense purely repulsive colloidal suspension. We use Multispeckle Diffusing Wave Spectroscopy to monitor the transient motions of colloidal particles after being submitted to an oscillatory strain. This technique proves efficient to record the time evolution of the relaxation times distribution. After a high oscillatory shear, we show that this distribution displays a full aging behavior. Oppositely, when a moderate shear is applied the distribution is modified in a non trivial way. Whereas high shear is able to erase all the sample history and rejuvenate it, a moderate shear helps it to age. We call this phenomena overaging. We demonstrate that overaging can be understood if the complete shape of the relaxation time distribution is taken into account. We finally report how the Soft Glassy Rheology model accounts for this effect.