Dynamics of density fluctuations in colloidal gels

A.H. Krall, Z. Huang and D.A. Weitz

Physica A: Statistical Mechanics and its Applications, 1997, vol. 235, issue 1, 19-33

Abstract: We use dynamic light scattering to measure the dynamic structure factor of density fluctuations occurring in colloidal suspensions that have attained a quiscent state long after aggregation. We find a stretched-exponential decay to a finite plateau. Our interpretation of the arrested decay is that these systems are gels, i.e., systems possessing a finite elastic modulus G. We develop a theory for the internal elastic modes of a fractal cluster and use it to derive G and the arrested, stretched-exponential behavior of colloidal gel dynamics. Good agreement between experiment and theory is obtained.

Keywords: Gels; Colloidal aggregation; Fractal dynamics (search for similar items in EconPapers)
Date: 1997
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:235:y:1997:i:1:p:19-33

DOI: 10.1016/S0378-4371(96)00325-1

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