Anomalous diffusion in aqueous solutions of gelatin

Abstract

Dynamic-light-scattering experiments on semidilute aqueous solutions of gelatin indicate three relaxation processes: an exponential for times less than ∼50 μsec followed by a power law at intermediate time and then a stretched exponential at long time. The characteristic time of the stretched exponential diverges as the system evolves to a gel. The latter two relaxations can be explained in terms of an anomalous diffusion mechanism where the mean-square displacement behaves as 〈${\mathit{R}}^2$〉∼lnt at intermediate time and 〈${\mathit{R}}^2$〉∼${\mathit{t}}^{\mathrm{\beta }}$ with β