Abstract
Electric properties of mixed anionic-nonionic surfactants in aqueous solutions above the CMC have been studied in term of pNa values, electrical conductivities, and dielectric constants. Electrical conductivity and dielectric constant were measured in the frequency range 220 Hz to 1 MHz. The degree of ionic dissociation and the number of effective carriers (Na +) of mixed micelle increase with increasing concentration of nonionic surfactant. In spite of the increase of the number of carriers (Na +), the activation energy for conduction increases with increasing concentration of nonionic surfactant. This may be attributed to the fact that the surface charge densities of counterions of mixed micelles decrease with increasing mixed micellar sizes.
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