Short-time properties in Colloidal Dispersions by Stokesian Dynamics Simulations

BANCHIO, A. J.; NÄGELE, G.

Aachen

Congreso; International Soft Matter Conference 2007; 2007

We present a detailed study of short-time transport properties in concentrated suspensions of charge-stabilized and of neutral colloidal spheres. The particles in these systems are mostly subject to strong many-body hydrodynamic interactions. A recently developed accelerated Stokesian Dynamics simulation method is used to calculate hydrodynamic functions, wave-number-dependent collective diffusion coefficients, self-diffusion and high-frequency limiting viscosities. Our simulation results are compared with available theoretical predictions and experimental data. We show that the form of the hydrodynamic function in dense charge-stabilized systems at low salinity can be understood without invoking the concept of hydrodynamic screening. We also discuss the validity of generalized Stokes-Einstein relations.