Study of Acoustic Parameters in Binary Mixture at Variable Frequencies

Abstract

The acoustical parameters for two binary liquid mixtures, acetone–toluene and acetone–xylene, have been determined for three different frequencies (1 MHz, 3 MHz, and 5 MHz) at 303 K. The acoustical parameters such as isentropic compressibility ($\beta$), intermolecular free length ($L_\mathrm{f}$), acoustic impedance ($Z$), and their excess values are computed for the two systems from the measured ultrasonic velocity and density values. The extent of interactions between the component molecules has been investigated. For the acetone–toluene system, the more negative values of the different excess parameters suggest that the interactions between acetone–toluene molecules are greater compared to the acetone–xylene system. With an increase of frequency, the extent of the interactions becomes weaker in both systems due to thermal relaxation and agitation of the component molecules.