Ultrasonic studies in molten pyridinium chloride solutions

Abstract

Ultrasonic absorptions in the 13-91 Mc/s region and ultrasonic velocities have been measured in molten pyridinium chloride containing various concentrations of anilinium chloride or cetyldimethylbenzylammonium chloride as solutes, at 155º. Adiabatic compressibilities were calculated for both systems. The anilinium chloride system behaved normally, but with the larger cation a sharp change in both absorption and velocity occurred at a concentration of 0.06m, in agreement with measurements of other physico-chemical properties. For more concentrated solutions, a pronounced ultrasonic relaxation was found, having a characteristic frequency of about 40 Mc/s; this may be interpreted in terms of a simple micelle growth mechanism.