Nonanomalous diffusion in Vycor porous glass

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Abstract
The diffusion of polystyrene in solution in the pore space of Vycor porous glass has been studied by the method of dynamic light scattering. In contrast to diffusion rates reported by others, we find results that are completely consistent with our previous measurements in other porous glass systems and that are in agreement with predictions of hydrodynamic theories and a model of chaotically connected pores. The anomalously slow diffusion of azobenzene in Vycor reported by others is possibly attributable to the residual effects of surface adsorption, which we have carefully eliminated in our experiment.