Gelation of Colloidal Silica

Abstract
Classical light-scattering studies of colloidal silica gels show that they have a fractal structure for length scales shorter than a concentration-dependent crossover length ξ, and behave like a collection of nearly randomly distributed scattering centers for length scales greater than ξ. Our data show that ξ has a power-law concentration dependence, ξ∝c−1.17±0.1.