Abstract
Abstract When probe particles are embedded in disordered media such as semidilute polymer solutions or gels, the inner structure of the disordered media has a significant effect on the motion of the probe particles. From the results of the measurement of the diffusion of probe particles, we can indirectly obtain information on the structure of the media. In this review, studies of polymer solutions and gels relating to this technique are discussed and the experimental results are evaluated. In particular, trapping of a particle at the sol-gel transition, the diffusion of particles in semidilute polymer solution and gels, and the topological structure of these systems in the vicinity of the gelation threshold are described.
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