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5 Experimental Verification of Dynamic Scaling Theories and Discussions

5.8 Summarized parameters and surface tension in critical mixtures

Figure 5.55: Scaling function data of investigated binary and ternary mixtures: ▽ ethanol-dodecane, • methanol-n-hexane, ◦nitroethane-3-methylpentane, □nitroethane- cyclohexane, ▼n-pentanol-nitromethane, ⊛isobutoxyethanol-water, ■triethylalmine-water; ternary mixtures △α′ non-col, ⊡col, ♦α′′ non-col.

Parameters which have been obtained from ultrasonic spectrometry, dynamic light scat- tering and shear viscosity are presented in Table (5.9). It is a fascinating aspect of the dynamic scaling theory of ultrasonic attenuation that, due to scaling of frequency data of different critical mixtures fall on one scaling function, Fig.(5.55). However, the most curious specific system parameter is the characteristic relaxation rate amplitude Γ0, which according to Bhattacharjee-Ferrell theory, corresponds with the mutual diffusion coeffi- cient D and the fluctuation correlation length ξ. In Table (5.9) parameters Γ0 and ξ0 are listed for various binary mixtures with critical demixing point. The isobutoxyethanol- water system exhibits by far the smallest amplitude Γ0 in the relaxation rate of order parameter fluctuations. In comparison, with the system n-pentanol-nitromethane, Γ0 is 35

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