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Measurement of the fractal dimension, D, of colloidal aggregates of small silica particles is reported. We observe power-law decay of the structure factor S (k) k^-D by both light and x-ray scattering showing that the aggregates are fractal. D is found to be 2. 120. 05, which is intermediate between recent numerical results for the kinetic models of diffusion-limited aggregation (D=2. 5) and cluster aggregation (D=1. 75), but is rather close to the value for lattice animals (D=2. 0), which are equilibrium structures.
Schaefer et al. (Mon,) studied this question.
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