Laser light scattering from concentrated solutions of polystyrene latex spheres: A comparative study

Quasielastic light scattering was used to measure the mutual diffusion coefficient of polystyrene latex spheres over the concentration range 0.004 to 4.46 g per 100 ml. Measurements were made at 25.0 °C in solutions of 0.01 and 0.001 M sodium chloride, with several low sphere concentration measurements also being made in triply distilled water. The diffusion coefficient was found to be ionic strength dependent over the entire concentration range studied. Solutions of polystyrene spheres at moderate concentrations exhibit the phenomenon of multiple scattering. The available literature on multiple scattering is reviewed and criteria adopted for the reliable extraction of data from these solutions. The diffusion coefficients so obtained show substantial agreement with the macroscopic capillary penetration results of Anderson et al. The conclusion reached in this work is that quasielastic light scattering is able to provide a measure of the macroscopic mutual diffusion coefficient at moderate sphere concentra...

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