Short-time dynamics and sedimentation of charge-stabilized suspensions

  • G. Nägele
  • B. Mandl
  • R. Klein
Supramolecular Structures Under Flow
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 98)

Abstract

In this work, we discuss the combined effects of the electrostatic and hydrodynamic interaction (HI) on the short-time dynamics and the sedimentation velocity of charge-stabilized suspensions. For this purpose the measurable hydrodynamic function H(q) is calculated by using two methods based, respectively, on a renormalized density fluctuation expansion, and on a pairwise-additivity approximation of the hydrodynamic mobility tensors. It is shown that H(q) can deviate considerably from the free diffusion coefficient, D0, for systems of volume fractions Φ as low as 10−3, and that these effects are more pronounced for collective diffusion than for self-diffusion. For deionized suspensions, the sedimentation coefficient, H(0)/D0, and the short-time self-diffusion coefficient, Ds,short, are found at low Φ to scale, respectively, as Φ1/3 and Φ4/3. Furthermore, we analyze the dependence of H(0) and Ds,short on the amount of added electrolyte.

Key words

Short-time dynamics charge-stabilized suspensions hydrodynamic interaction sedimentation 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1995

Authors and Affiliations

  • G. Nägele
    • 1
  • B. Mandl
    • 1
  • R. Klein
    • 1
  1. 1.Fakultät für PhysikUniversität KonstanzKonstanzFRG

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