Ultrasonic absorption in aqueous binary mixtures. II. p-Dioxan–water at 11° and 25 °C

Ultrasonic absorption has been measured in the p-dioxane/water system at 25° and 11 °C at nine concentrations over the frequency range 0.3–630 MHz.It is shown that the frequency dependence can be fitted quantitatively by the ’’fluctuation’’ theory of Romanov and Solovev if NMR determined diffusion data are available. The experimentally determined amplitude of absorption agrees very well with that calculated using experimental thermodynamic data and the R–S theory. The ultrasonic relaxation times show the same concentration dependence as the high frequency dielectric relaxation measured by Garg and Smyth. The discussion considers the ultrasonic fluctuations as a dynamic analog of the clathrate hydrate forming proclivities of such solutes.