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Dynamics in dense suspensions of charge-stabilized colloidal particles

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Abstract.

The dynamic behavior of charge-stabilized colloidal particles in suspension was studied by photon correlation spectroscopy with coherent X-rays (XPCS). The short-time diffusion coefficient, D(Q) , was measured for volume concentrations φ ⩽ 0.18 and compared to the free particle diffusion constant D0 and the static structure factor S(Q) . The data show that indirect, hydrodynamic interactions are relevant for the system and hydrodynamic functions were derived. The results are in striking contrast to the predictions of the PA (pairwise-additive approximation) model, but show features typical for a hard-sphere system. The observed mobility is however considerably smaller than the one of a respective hard-sphere system. The hydrodynamic functions can be modelled quantitatively if one allows for an increased effective viscosity relative to the hard-sphere case.

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Authors and Affiliations

  1. European Synchrotron Radiation Facility, B.P. 220, F-38043, Grenoble, France

    A. Robert

  2. Saarland University, Physical Chemistry, 66123, Saarbrücken, Germany

    J. Wagner

  3. Wallburg-Realschule, 97483, Eltmann, Germany

    W. Härtl

  4. Hasylab/DESY, 22607, Hamburg, Germany

    T. Autenrieth & G. Grübel

Authors
  1. A. Robert
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  2. J. Wagner
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  3. W. Härtl
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  4. T. Autenrieth
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  5. G. Grübel
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Correspondence to A. Robert.

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Robert, A., Wagner, J., Härtl, W. et al. Dynamics in dense suspensions of charge-stabilized colloidal particles. Eur. Phys. J. E 25, 77–81 (2008). https://doi.org/10.1140/epje/i2007-10265-5

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  • DOI: https://doi.org/10.1140/epje/i2007-10265-5

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