We present experimental results showing that colloidal silica spheres can be induced to aggregate either slowly or very rapidly. The slow process always yields clusters with a fractal dimensionality df=2.08±{}0.05, but the rapid process can produce clusters with either df=1.75±{}0.05 or df=2.08±{}0.05. However, clusters with df=1.75 are always observed to restructure so as to yield df=2.08±{}0.05.
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Aubert et al. (1986) studied this question.
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