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The kinetics of the interaction between small colloidal silicic acid (CSA) particles and cationic polymers have been studied with a stopped-flow technique. The cationic polymers used were cationic polyacrylamide (CPAM) and cationic amylopectin (CAP). The CSA particles were slightly aggregated. The size of the primary particles was 5.5 nm and the particles used were, consequently, somewhat larger...
A simple method has been developed to determine the axial ratios and solvation volume of small colloidal silica particles characterised as equivalent ellipsoids of revolution with the same hydrodynamic properties as the actual particles. The method is based on a combination of viscometry and dynamic light scattering and uses the relations of Simha and Perrin for the specific viscosity and frictional...
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