The behavior of sound absorption coefficient for binary mixture nitroethane-isooctane above critical temperature and concentration

Abstract

The temperature dependence of the sound absorption coefficient at critical composition and above critical temperature Tc for the binary mixture nitroethane-isooctane at 5, 7, 10, 15, 21, and 25 MHz frequencies (f) is investigated. The frequency dependence of the absorption coefficient (α) for the same critical binary mixture at different temperatures above critical temperature is studied. In addition, the linear relation of the sound absorption coefficient at critical point (αc)/f2 versus f−1.06 showed an excellent agreement with the dynamic scaling theory of Ferrell and Bhattacharjee, Physical Review A 31, 1788 (1985). The experimental values of (αf−2αcf−2) for nitroethane-isooctane binary mixture are plotted as a function of reduced frequency Ω and it showed a good agreement with the theoretical scaling function F(Ω).