Europhys. Lett, 48 (4), pp. 397-402 (1999)
Theory of long-time wave number dependent diffusion coefficients in concentrated neutral colloidal suspensions
R. Verberg 1, I. M. de Schepper 1 and E. G. D. Cohen 2
1 I. R. I. Delft University of Technology - 2629 JB Delft, The Netherlands
2 The Rockefeller University - New York, New York 10021, USA
(received 19 April 1999; accepted in final form 9 September 1999)
- Fluid dynamics: General theory.
PACS. 82.70Dd - Colloids.
PACS. 83.10Ff - Continuum mechanics.
We present for the first time a theory for the long-time wave number (k-) dependent collective and self-diffusion coefficients and , respectively, of neutral colloidal suspensions at high volume fractions . This theory is based on the Smoluchowski equation with mean-field-like hydrodynamic interactions, cage-diffusion and is free of adjustable parameters. The results provide a molecular interpretation of the experiments by Segrè et al. ( SEGR`E P. N. AND PUSEY P. N., Phys. Rev. Lett., 77 (1996) 771), who recently measured of a concentrated neutral colloidal suspension.
Copyright EDP Sciences