CONDUCTIVITY OF REVERSE MICELLAR SYSTEMS OF AOT–n-HEPTANE–WATER+DIMETHYLSULFOXIDE OR DIETHYLSULFOXIDE AT TEMPERATURE RANGE 20–50ºC

Abstract

Dependence of conductivity on temperature of sodium bis(2-ethylhexyl) sulfosuccinate (AOT)–n-heptane–water+dimethylsulfoxide (DMSO) or diethylsulfoxide (DESO) reverse micellar system has been studied at fixed ratio of molal concentrations of polar phase (water, water+DMSO, water+DESO) to surfactant and at different volume ratios of DMSO (DESO) and water. The threshold percolation temperatures (T_p) for each system have been estimated, the effects of both DMSO and DESO on threshold percolation temperature and percolation process have been discussed. Both DMSO and DESO act as percolation-resisting additives. The presence of mixed solvent has shown a decrease of T_p and tendency to transfer a system from percolating to non-percolating. The activation energy (E_p) for percolation of conductance has also been determined according to Arrhenius equation. The results show that E_p decreases with addition of DMSO or DESO and with an increase of concentration of DMSO.