Abstract
Neutron small angle scattering has been used to study two microemulsions which show a critical behavior. The systems differ in that one is of the dilute oil-in-water type and monophasic, whilst the other is concentrated and passes through Winsor I to Winsor III to Winsor II phase transitions. Experiments on the dilute microemulsion show that the droplet structure is retained as the critical region is crossed and that the critical scattering arises from fluctuations in the local concentration of these droplets. In the concentrated system, critical scattering is observed close to the Winsor I to Winsor III and to the Winsor II to Winsor III phase transitions. The structure of the Winsor I and Winsor II phases is confirmed as being, respectively, dispersions of oil droplets in water, and water droplets in oil. For the Winsor III phase, where the volume fractions of oil and water are comparable, experimental results are presented which provide strong evidence in favour of a cubic oil and water inter-contiguous structure.
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