Studies on the Conductivity of Mixed Reverse Micelles of Anionic and Non-Ionic Surfactants

In the SDS/Tween60/hexanol/cyclohexane/water system, a conductivity maximum was observed in the conductivity (kappa) and molar ratio of water to surfactants (W-0) curves for mixed reverse micelles. The W-0, max moved to a bigger W-0 value as the x(SDS) (molar fraction of anionic surfactant) value increased. At x(SDS)<= 0.5, the conductivity values that correspond with W-0.max max increased as x(SDS) increased; and at xSDS >= 0.5, the conductivity values decreased. In the AOT/Tween60/cyclohexane/water system, the observed phenomenon was similar to the SDS/Tween60/hexanol/cyclohexane/water system. However, conductivity values that correspond with W-0.max increased with increasing x(AOT) and there was no maximum value. The difference is mainly due to cosurfactant effects, which was confirmed by the SDS/TritionX. 100/ hexanol/cyclohexane/water system.