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Scale invariance in two-dimensional reaction-limited colloidal aggregation

Experimental studies of reaction-limited cluster-cluster aggregation in dense colloidal monolayers at liquid surfaces demonstrate that the system evolves to a state lacking any characteristic length scale. In particular, the structure function S(q, t) diverges in the limit t to infinity and q to 0, suggestive of self-organized criticality. The self-organization is reflected in the cooperative nature of the divergence.