Dynamics of charge-stabilized colloidal particles: hydrodynamic and electrokinetic effects

NÄGELE, G.; M. G. MCPHIE; BANCHIO, A. J.; PATKOWSKI, A.; GAPINSKI, J.

Aachen

Congreso; International Soft Matter Conference 2007; 2007

We report on a joint experimental-theoretical study of dynamic processes in suspensions of charge-stabilized colloidal particles. Various transport properties like diffusion coefficients and viscosities, and dynamic scattering functions have been calculated by means of a recently developed accelerated Stokesian dynamics simulation tool, and using methods of many-body theory adapted to colloidal soft matter systems. Results obtained from the theory and simulations are compared with static and dynamic scattering experiments on colloidal spheres, globular proteins and DNA fragments. Salient results of this study comprise the absence of screening of hydrodynamic flow in salt-free fluid suspensions, the influence of the electrolyte ion kinetics on the colloid diffusion in non-dilute systems, and a hydrodynamic explanation for the unexpected non-monotonic concentration dependence of long-time self-diffusion in suspensions of moderately charged particles.