Abstract
Invited paper Small-angle neutron scattering (SANS) is used to determine the structure of concentrated AOT (sodium di-2-ethylhexylsulfosuccinate)-water-decane microemulsions containing equal volumes of water and oil. The preferred curvature of the interracial film toward water is demonstrated by performing a contrast variation experiment, and observing the extrapolated zero-angle scattering intensity. Each spectrum exhibits a SANS peak position that is a strong function of the surfactant concentration. These spectra are consistent with an ordered droplet phase, as opposed to a bicontinuous structure. The peak position can be used to determine the microemulsion droplet size. The droplet radius, used in conjunction with the contrast variation results, provides an estimate of the interracial film thickness.
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