Abstract
A new system of highly charged colloids consisting of polybutylacrylate was prepared by means of emulsion polymerization. The static structure factor of the complex liquids formed by self-organization of these systems was studied by means of light scattering experiments and compared to hypernetted chain (HNC) and Rogers-Young (RY) approximations. In addition, the long-time self-diffusion coefficients in concentrated colloidal liquids were determined by Pulsed Field Gradient NMR (PFGNMR) in dependence on the effective interaction potential of the colloidal particles, which was tuned by the ionic strength of the suspending medium. The obtained diffusion coefficients are compared to those obtained by Brownian Dynamics (BD) simulations. Systems close to the freezing point and less ordered systems with high ionic strengths can be well described by direct interactions. The dynamics of systems at intermediate ionic strength, however, exhibit deviations from the predictions of BD. These deviations are hints for additional indirect, hydrodynamic interactions which are not taken into account by our BD algorithm.
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