Enhanced structural correlations accelerate diffusion in charge-stabilized colloidal suspensions.
Theoretical calculations for colloidal charge-stabilized suspensions and hard-sphere suspensions show that hydrodynamic interactions yield a qualitatively different particle concentration dependence of the short-time self-diffusion coefficient. The effect, however, is numerically small and hardly accessible by conventional light-scattering experiments. By applying multiple-scattering decorrelation equipment and a careful data analysis we show that the theoretical prediction for charged particles is in agreement with our experimental results from aqueous polystyrene latex suspensions.
Overbeck
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E
Institut für Physik der Johannes-Gutenberg-Universität, 55099 Mainz, Germany.
Sinn
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C
Watzlawek
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M