High-frequency dielectric properties of aerosol sodium bis-2-ethyl-hexylsulfosuccinate (AOT)–H2O–CCl4systems in the reversed micellar phase

The complex permittivity of sodium bis-2-ethyl-hexylsulfosuccinate (AOT)–${\mathrm{H}}_2$O–${\mathrm{CCl}}_4$ microemulsions has been measured by a frequency domain coaxial technique in the range 0.02-3 GHz as a function of molar ratio W=[${\mathrm{H}}_2$O]/[AOT], for small amounts of water (0.2<W<10). A relaxation process has been observed, whose behavior as a function of W has been interpreted in terms of an increasing mobility of AOT ion pairs connected with the hydration process of the micellar aggregates.