CONICET | Buscador de Institutos y Recursos Humanos

We explore dynamic processes in suspensions of charge-stabilized colloidalparticles and biological macromolecules. Various short-time transport propertiesincluding diffusion functions and the high-frequency viscosity, have been calculated bymeans of a recently developed accelerated Stokesian Dynamics simulation tool. Thishas allowed us to study dense suspensions with many-body hydrodynamic interactions.The results of this study are used to explore the validity of generalized Stokes-Einstein relations, and the possibility of measuring self-diffusion at a finite scatteringwave number. The influence of the electrolyte ion dynamics on the colloidal longtimeself-diffusion in non-dilute suspensions of small colloids is determined using amany-component mode-coupling theory that accounts for the inter-ionic hydrodynamicinteractions. We investigate the influence of the asymmetry in the electrolyte ioncharges and mobilities on the friction experienced by the charged colloids. It isshown that these asymmetries affect the electrolyte friction significantly, and thatthe electrolyte friction contribution to self-diffusion decreases with increasing colloidconcentration.