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Dynamics of density fluctuations in colloidal gels

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

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.

Suggested Citation

  • Krall, A.H. & Huang, Z. & Weitz, D.A., 1997. "Dynamics of density fluctuations in colloidal gels," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 235(1), pages 19-33.
    • Handle: RePEc:eee:phsmap:v:235:y:1997:i:1:p:19-33
    DOI: 10.1016/S0378-4371(96)00325-1
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    References listed on IDEAS

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    1. Pusey, P.N. & Van Megen, W. & Underwood, S.M. & Bartlett, P. & Ottewill, R.H., 1991. "Colloidal fluids, crystals and glasses," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 176(1), pages 16-27.
    2. Asch, Peter & Gigliotti, Gary A & Polito, James A, 1993. "Free Riding with Discrete and Continuous Public Goods: Some Experimental Evidence," Public Choice, Springer, vol. 77(2), pages 293-305, October.
    3. Pusey, P.N. & Van Megen, W., 1989. "Dynamic light scattering by non-ergodic media," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 157(2), pages 705-741.
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