Abstract
We report results of a detailed dielectric, IR and elastic neutron scattering study of bis(2-ethylhexyl)sulfosuccinate (AOT) based micellar systems in CCl 4 as a function of the molar ratio W=[H 2O]/[AOT]. The aim is to explore the connection between hydration and dynamical properties of the reverse AOT micelles. We restricted our analysis to the region of small amounts of water added (0<W<10) where the properties of the system depend strongly upon W. The hydration has been studied by means of IR absorption of OH stretching modes in the 3800-3000 cm −1 frequency range. The dynamical properties of the systems have been investigated by dielectric permittivity measurements performed in the range 0.02–3 GHz to provide information on the nature of dynamics of polar AOT head-groups, and by elastic neutron scattering measurements to provide information on the dynamics of hydrogen atoms of AOT molecules. The data indicate an increasing mobility of both polar head-groups and surfactant chain as a function of the hydration degree. Above W∼1 a marked departure from low hydration condition is observed. The results have been explained by taking into account for the existence of two different dynamical contributions from more mobile completely-hydrated and less mobile partially-hydrated head-groups. The main results of these investigations are here reviewed and discussed.
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