Ultrasonic Absorption in Triethylamine-Water Solution near its Critical Solution Temperature

Abstract

Ultrasonic absorption and velocity (1, 5, 10 MHz) in triethylamine-water binary liquid system were investigated through the critical solution temperature by means of the pulse-echo method. The results were obtained for the variation of velocity with temperature and also for the behavior of the attenuation near the critical point. For each frequency investigated, the absorption exhibited a marked maximum at the critical solution temperature similar to the results shown in the earlier work at 600 KHz [A. G. Chynoworth and W. G. Schneider, J. Chem. Phys. 19, 1566 (1952)]. However, the temperature dependence of the attenuation near the critical temperature is quite different from the observations made earlier at higher frequencies (1–9 MHz) [G. F. Alfray and W. G. Schneider, Discussions Faraday Soc. No. 15, 218 (1953)]. The differences between the present and the earlier work are compared and discussed. [The work was supported in part by an Ohio University Research Grant and a National Science Foundation Grant.]