Abstract
Micellization behavior of aqueous solutions of dodecylethyldimethylammonium bromide has been studied as a function of concentration and temperature employing densiometry, viscometry, ultrasound velocity measurements and conductometry. Density data has been used to evaluate apparent molar volumes and apparent molar expansion of surfactant monomers and micelles. Isoentropic compressibility, apparent molar isoentropic compressibility and apparent molar compression values and various acoustic interaction parameters like molar sound velocity, acoustic impedance and Wada's constant, have also been calculated using ultrasound velocity data. Conductivity measurements have been used to evaluate the degree of counterion binding. All methods yielded almost similar critical micellar concentration values. The data was used to discuss thermodynamics of micellization based on phase separation and mass action models. Micellization process of the surfactant was found to be spontaneous.
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