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Dynamic light scattering by non-ergodic media

Author

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  • Pusey, P.N.
  • Van Megen, W.

Abstract

We consider dynamic light scattering (DLS) by non-ergodic media, such as glasses or gels, in which the scattering elements are able only to make limited Brownian excursions about fixed average positions. We point out that, for such media, the time-averaged correlation function of the intensity of scattered light, the quantity obtained from a single DLS measurement, is different from the ensemble-averaged function. An expression for this time-averaged intensity correlation function is derived and its properties and experimental analysis are discussed. Some of the literature on DLS by polymer gels is re-evaluated in the light of these new theoretical predictions.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:phsmap:v:157:y:1989:i:2:p:705-741
    DOI: 10.1016/0378-4371(89)90063-0
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    Cited by:

    1. 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.
    2. Voigt, Harald & Hess, Siegfried, 1994. "Comparison of the intensity correlation function and the intermediate scattering function of fluids: a molecular dynamics study of the Siegert relation," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 202(1), pages 145-164.
    3. Lekkerkerker, H.N.W. & Dhont, J.K.G. & Verduin, H. & Smits, C. & van Duijneveldt, J.S., 1995. "Interactions, phase transitions and metastable states in concentrated colloidal dispersions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 213(1), pages 18-29.
    4. Bartsch, E. & Frenz, V. & Möller, S. & Sillescu, H., 1993. "Colloidal polystyrene micronetwork spheres — a new mesoscopic model of the glass transition in simple liquids," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 201(1), pages 363-371.
    5. Jing, Dengwei & Song, Dongxing, 2017. "Optical properties of nanofluids considering particle size distribution: Experimental and theoretical investigations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 452-465.

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