Abstract
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 factors respectively of ellipsoids of revolution. The axes of the unsolvated equivalent ellipsoid and the solvation volume can be determined by knowing or assuming the thickness of the solvation shell. Silica particles form elongated aggregates and the method is applied to particles having three different degrees of aggregation.
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