title: Long-time dynamics of concentrated charge-stabilized colloids.
abstract: Dynamic light scattering was used to study the dynamic structure factor, S(q,t), of suspensions of charged colloidal silica spheres over the full colloidal time range. We show that a dynamic scaling relation for S(q,t) found by Segrè and Pusey [Phys. Rev. Lett. 77, 771 (1996)10.1103/PhysRevLett.77.771] for hard spheres, relating long-time and short-time dynamics, and collective and self-diffusion, also applies to charged colloids up to the freezing concentration. The universality of this scaling is analyzed theoretically. Our experimental data confirm dynamic freezing criteria proposed for the long-time self- and cage-diffusion coefficients, along with a theoretical prediction for the self-diffusion coefficient.
authors.affiliation: Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany. p.holmqvist@fz-juelich.de
authors.forename: Peter
authors.initials: P
authors.lastname: Holmqvist
authors.forename: Gerhard
authors.initials: G
authors.lastname: Nägele