Research on Acoustical Parameters and Apparent Molar Volume of Lithium Soaps in Methanol

Ultrasonic velocity and density measurements of lithium soaps (abietate, oleate and myristate) were
measured in methanol at different frequencies (1-5 MHz) and under different conditions to determine
critical micelle concentration and various acoustical parameters for the soap solutions. There are
many factors, which contribute to changes in apparent molar volume such as solvation of amphiphilic
solutes, nature of the ionic head group and the length of the non-polar portion of amphiphilic solutes.
The evaluated parameters of ultrasonic velocity and the density data suggest a significant solutesolvent
interaction in dilute solution and micellar aggregation at higher concentration.