Supramolecular Structures Under Flow

Trends in Colloid and Interface Science IX

Volume 98 of the series Progress in Colloid & Polymer Science pp 117-123


Short-time dynamics and sedimentation of charge-stabilized suspensions

  • G. NägeleAffiliated withFakultät für Physik, Universität Konstanz
  • , B. MandlAffiliated withFakultät für Physik, Universität Konstanz
  • , R. KleinAffiliated withFakultät für Physik, Universität Konstanz

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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, D 0, 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)/D 0, and the short-time self-diffusion coefficient, D s,short, are found at low Φ to scale, respectively, as Φ 1/3 and Φ 4/3. Furthermore, we analyze the dependence of H(0) and D s,short on the amount of added electrolyte.

Key words

Short-time dynamics charge-stabilized suspensions hydrodynamic interaction sedimentation