Quasielastic light-scattering study of the movement of particles in gels

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Abstract
Quasielastic light scattering of polystyrene latex spheres incorporated in polyacrylamide solutions whose cross-link content was varied through the gelation threshold was performed over a range of k values. From the initial amplitude of the correlation functions we obtain the fraction of moving particles, which decreases monotonically with 1/k and cross-link content. The measured pore size distribution of the gel is sharply peaked. The results suggest that the gel has a large interconnected space as well as many small pores.