Effect of Ionic Surfactants on Ion Vibration Current and Colloid Vibration Current

Abstract

In order to clarify the effect of constituent ions on an electroacoustic phenomenon in an aqueous solution of ionic surfactant, we measured the total vibration current (TVI) as a function of the molarity of aqueous solution of several ionic surfactants at 298.15 K under atmospheric pressure. The different counterion caused the remarkable change in TVI, while the difference in alkyl chain length of surfactant ion hardly affected TVI. This suggests that the size and/or aggregation number of micelle is not a crucial factor contributing to TVI. Employing the fluorocarbon surfactant, on the other hand, there appeared a fairly large change compared to the hydrocarbon surfactant. This implies that the density contrast between medium and micelle is significant for TVI.