Dielectric Studies on Colloidal Solutions. I. High-frequency Conductivity of Aqueous Solutions of Paraffin-chain Salts

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Abstract
The high-frequency conductivity of solutions of sodium dodecyl sulphate, sodium oleate, and dodecyl amine hydrochloride was measured at frequencies of 15 and 30 Mc./sec. The high-frequency effect remarkably appeared at the concentration corresponding to the critical micelle concentration and the effect can be interpreted in terms of Debye-Falkenhagen’s theory of strong electrolytes. The appearance of maximum and gradual decrease in high-frequency effect may be explained by the shortening of the relaxation time or by the reduction of the electrostatic interaction due to the change of micelle structures with the increase of concentration.