IFEG 20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Short-, intermediate-, and long-time di usion in charged colloidal suspensions
Autor/es:
ADOLFO J. BANCHIO; MARCO HEINEN; PETER HOLMQVIST; GERHARD NÄGELE
Lugar:
La Plata
Reunión:
Workshop; Grand Challenges in Particulate Media: From Granular Media to Colloids to Active Matter; 2014
Institución organizadora:
CONICET-LA PLATA
Resumen:
In this work, we present a comprehensive theoretical-experimental study of collectiveand self-di usion in concentrated suspensions of charge-stabilized colloidal spheres.Correlation times ranging from colloidal short-time to long-time regime are considered.The intermediate, and self-intermediate scattering functions, the mean square displacement,and other dynamic quantities, are calculated by accelerated Stokesian Dynamics(ASD) simulations where many-body hydrodynamic interactions (HIs) are included, andadditionally Brownian Dynamics (BD) simulations and mode-coupling theory (MCT) calculationswithout HIs included. On the basis of this results, the in
uence of HIs on thedynamics, and the accuracy of the MCT method are quati ed. In theory and simulation, the spheres are assumed to interact directly by a hard-core plus screened Coulomb e ectivepair potential. The system size corrected dynamic scattering functions obtained inthe ASD simulations are in decent accord with our dynamic light scattering (DLS) datafor a concentration series of charged silica spheres in an organic solvent mixture, withinthe experimentally accessed time window.We hereby provide a full overview on di usion processes in charge-stabilized suspensions.
