Polystyrene latex spheres diffusion studies

Newman, et al. used QELSS to moiutor the diffusion of polystyrene latex spheres through F-actin solutions(106). Four probe species with radii of 55, 110, 270, and 470 nm were employed. Actins were polymerized with MgCh, KCl, or CaCl2 however, all samples studied were liquids, not gels. Prior to polymerization. Dp in the actin solutions was not sigiuficantly different from Dp of the same probe in pure water. On addition of salt to start the polymerization process. Dp of the... 

W. Brown and R. Rymden. Diffusion of polystyrene latex spheres in polymer solutions studied by dynamic light scattering. Macromolecules, 19 (1986), 2942-2952. 

Brown and Rymden used light scattering spectroscopy to examine the diffusion of PSL spheres through carboxymethylcellulose (CMC) solutions(15). The primary interest was to study how the latex spheres adsorb this polymer. Brown and Rymden concluded that CMC goes down on the surface in a relatively fiat conformation. CMC is a weak polyelectrolyte. The extent of its binding to polystyrene latex is complexly influenced by factors including salt concentration, pH, and probe size and surface chemistry. 

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