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We report on the extension of the droplet model to account for static and dynamic light scattering studies of a ternary water-in-oil microemulsion close to its critical point. This model, which assumes that the critical microemulsion droplets are forming transient polydisperse fractal aggregates, reproduces well the usual features of critical phenomena and is also able to account, in a very natural way, for the dynamical background effects evidenced experimentaly.

Experimental results on critical static and dynamic light scattering in C6E3-water micellar solutions are very well explained by a modified version of the dynamical droplet model, which assumes that the supramolecular solutions are made of polydispersed fractal clusters with a fractal dimension df=2.5 and a polydispersity exponent tau =2.2. The model takes into account the finite size of the monomers constituting the clusters, at the origin of dynamical background effects.