Abstract
The ultrasonic absorption and sound velocity in the water/bis(2-ethylhexyl) sulfosuccinate (AOT)/n-heptane system have been measured as a function of the molar concentration ratio R (R = (water)/(AOT)) at 15, 25, and 35{degree}C. The ultrasonic relaxation spectra in the frequency range between 15 and 250 MHz are described by a single time relaxation equation. The analysis of the fitting parameters indicates the different processes probed by the acoustic waves: in particular, the exchange of the surfactant molecules between bulk hydrocarbon and micelles, the shape fluctuation of the reversed AOT micelles, and the exchange of water molecules between the polar sheath of the micelles and the water pool. Sound velocity results show that water-filled micelles are more floppy than bulk water.
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