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High-bandwidth Viscoelastic Properties of Aging Colloidal Glasses and Gels by Jabbari-Farouji, S.; Atakhorram, M.; Mizuno, D.; Eiser, E.; Wegdam, G. H.; MacKintosh, F. C.; Bonn, Daniel; Schmidt, C. F. is a scholarly article available to read on EtoBox.

What is High-bandwidth Viscoelastic Properties of Aging Colloidal Glasses and Gels about?

We report measurements of the frequency-dependent shear moduli of aging colloidal systems that evolve from a purely low-viscosity liquid to a predominantly elastic glass or gel. Using microrheology, we measure the local complex shear modulus $G^{*}(\omega)$ over a very wide range of frequencies (1 Hz- 100 kHz). The combined use of one- and two-particle microrheology allows us to differentiate between colloidal glasses and gels - the glass is homogenous, whereas the colloidal gel shows a considerable degree of heterogeneity on length scales larger than 0.5 micrometer. Despite this characteristic difference, both systems exhibit similar rheological behavior which evolve in time with aging, showing a crossover from a single power-law frequency dependence of the viscoelastic modulus to a sum of two power laws. The crossover occurs at a time $t_{0}$, which defines a mechanical transition point. We found that the data acquired during the aging of different samples can be collapsed onto a single master curve by scaling the aging time with $t_{0}$. This raises questions about the prior interpretation of two power laws in terms of a superposition of an elastic network embedded in a viscoela

Author

Jabbari-Farouji, S.; Atakhorram, M.; Mizuno, D.; Eiser, E.; Wegdam, G. H.; MacKintosh, F. C.; Bonn, Daniel; Schmidt, C. F.

Published

2007

Language

EN