A ˚) is regulated mainly by the molar ratio of water to Na-Measurements of some physicochemical properties (density, vis- . cosity, conductance, UV-vis spectra, IR spectra) of the water/ As a consequence of the high surface / volume ratio of copper(II) bis(2-ethylhexyl) sulfosuccinate (Cu(DEHSS) 2 )/CCl 4 the aqueous nanodroplets, the state of the water solubimicroemulsions, at a fixed surfactant molal concentration ([Cu lized in NaDEHSS reversed micelles was different from (DEHSS) 2 ] Å 0.05003 mol kg 01 ), as function of the molar ratio the bulk. However, it has been shown that a simple model R (R Å [water]/[DEHSS 0 ]) have been performed at 25ЊC. Inforbased on two types of water ( ''interfacial'' water located mation on some structural and dynamical properties of the watercontaining Cu(DEHSS) 2 reversed micelles and of their evolution near the water / NaDEHSS interface and ''bulk'' water lowith R are derived from the experimental results. The comparison cated in the core of the water droplets ) reproduces consiswith the same properties of water-containing sodium bis(2-ethyltently the thermodynamic and spectroscopic properties of hexyl) sulfosuccinate reversed micelles allows to evidence the pivthe confined water as well as their evolution with the otal role of the water-triggered interactions between the counterion micellar radius ( 9 -12 ) . and the surfactant anion on driving the structural and dynamical Water solubilization in the micellar core not only swells evolution of reversed micelles. ᭧ 1998 Academic Press the NaDEHSS reversed micelles but also progressively Key Words: reversed micelles; copper(II) bis(2-ethylhexyl) suldissociates the surfactant molecules, leaving hydrated fosuccinate; intermicellar interactions.
charged heads at the micellar surface and hydrated Na / counterions in the aqueous core. Both of these effects have strong influence on the wide variety of dynamical