An-Najah Staff

Ultrasonic absorption and velocity measurements were made as a function of temperature for the binary mixtures of benzene-coconut oil and hexane-β, β′-dichloroethyl ether. Ultrasonic absorption at 5, 7, 10, 15, 21, and 25 MHz and above T_c is a analyzed by the dynamic scaling theory of Ferrell and Bhattacharjee (FB). The ultrasonic absorption of the two binary mixtures exhibit strong temperature and frequency dependence near T_c. Ultrasonic velocity behaves as a linearly decreasing function of temperature above the critical temperature satisfying linear relation. The observed of α_c/f² Vs. f^−1.06 yields a straight line as predicted by FB theory. Experimental values of α/α_c for the two binary critical mixtures are compared to the scaling function F(ω*).