Short-time dynamics and sedimentation of charge-stabilized suspensions
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 wordsShort-time dynamics charge-stabilized suspensions hydrodynamic interaction sedimentation
Unable to display preview. Download preview PDF.
- 4.Nägele G (1994) habilitation thesis, University of KonstanzGoogle Scholar
- 8.Kim S, Karrila SJ (1991) “Microhydrodynamics” Butterworth-Heinemann, BostonGoogle Scholar
- 14.Klein R, Nägele G, Nuevo Cimento, in pressGoogle Scholar
- 15.Krause R, D'Aguanno B, Mendez-Alcaraz JM, Nägele G, Klein R, Weber R, (1991) J Phys C 3:4459Google Scholar
- 16.Thies-Weesie D, Philipse AP, Nägele G, Mandl B, Klein R, submittedGoogle Scholar