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Light-scattering correlation spectroscopy measurements were made on a water-in-oil microemulsion at a constant volume fraction of water {φ} as a function of the temperature. The density correlation function shows nonexponential decay, which is analyzed in terms of cooperative or structural motion and of single-particle diffusional motion. The system shows a critical behavior at T=41 ^∘{}C. The fast relaxation rate (cooperative diffusion) gives information about the details of the critical transition via the hypothesis of droplet clustering. The slow relaxation rate is connected to the self-tracer motion.
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Maisano et al. (1989) studied this question.
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