Dichotomic Aging Behaviour in a Colloidal Glass
Abstract
An unexpected dichotomic long time aging behaviour is observed in a glassy colloidal clay suspension investigated by X-Ray Photon Correlation Spectroscopy and Dynamic Light Scattering. In the long time aging regime the intensity autocorrelations are non-exponential, following the Kohlrausch-Williams-Watts functional form with exponent bQ. We show that for spontaneously aged samples a stretched behaviour (\beta_Q < 1) is always found. Surprisingly a compressed exponent (\beta_Q > 1) appears only when the system is rejuvenated by application of a shear field. In both cases the relaxation times scale as Q^{-1}. These observations shed light on the origin of compressed exponential behaviour and helps in classifying previous results in the literature on anomalous dynamics.
Cite
@article{arxiv.2308.14425,
title = {Dichotomic Aging Behaviour in a Colloidal Glass},
author = {Roberta Angelini and Laura Zulian and Andrei Fluerasu and Anders Madsen and Giancarlo Ruocco and Barbara Ruzicka},
journal= {arXiv preprint arXiv:2308.14425},
year = {2023}
}
Comments
5 pages, 5 figures