Dynamics of Fractal Colloidal Aggregates

Abstract

Dynamic light-scattering measurements on fractal aggregates of colloidal silica show that the mean decay rate (Rayleigh linewidth) of the intensity autocorrelation function scales like $q^{2.7}$, where $q$ is the momentum transfer. This result is compared to the $q^3$ prediction for percolation clusters and the more complex results derived here for cluster-cluster aggregation.