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Abstract
A perturbation theory for the high frequency elastic moduli of colloidal dispersions is developed using an inverse power potential reference fluid. When supplemented by a random phase approximation for the perturbation potential, the theory can be used to determine rheological properties of disordered colloidal dispersions from observed structure factors. The theory is applied to measurements of the structure factor for an aqueous dispersion of polystyrene latex spheres at the order-disorder transition. The calculated properties are found to be in good agreement with independent experimental measurements.