Critical behavior of the ultrasonic attenuation and velocity and shear viscosity for the binary mixture of nitrobenzene-<i>n</i>-hexane

Ultrasonic velocity and absorption and shear viscosity as a function of temperature and frequency are reported for the binary mixture nitrobenzene-n-hexane in the homogeneous phase above Tc. The observed absorption αc/f2 vsf f−1.06 yields a straight line as predicted by the dynamic scaling theory of Ferrell and Bhattacharjee. The critical amplitudes of the thermal expansion and specific heat have been calculated using the two-scale factor universality relation. The adiabatic coupling constant g is calculated and compared to the experimental value. The experimental values of α/αc for nitrobenzene-n-hexane are compared to the scaling function F(ω*) and show a good agreement with the theory. The velocity for the system at the critical concentration above the critical temperature appears to linearly decrease with increasing temperature.

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