Original English dissertation · scientific equations reproduced directly from the source PDF.

do not confirm the conclusion by Mistura that close to the col point the critical absorp- tion should decrease with increasing number of components. In the case of the ternary systems of the present thesis this quantities corresponds rather with the fluctuation corre- lation length from dynamic light scattering. The same correspondence can be found with the critical amplitude SBF, which seems to demonstrate the same anomaly as the well known binary system nitroethane-cyclohexane.

Additionally, in order to more closely consider the large variation of characteristic re- laxation rate amplitude Γ0 of various binary systems, its dependence on surface tension of that quantity has been considered. Unfortunately, there are only insufficient surface tension data at the critical point. Therefore only a qualitative analysis of such correlation could be done. This analysis revealed a dependence of Γ0 on the surface tension.

In summary, the results clearly demonstrate that the Bhattacharjee-Ferrell theory and the crossover theory nicely represent the experimental ultrasonic attenuation data as well as the shear viscosity and dynamic light scattering data. This is true for binary and also for ternary mixtures. Experimental critical exponents agree with those from theory. There is, however, a necessity for the development of new theories treating the coupling be- tween chemical relaxations and critical fluctuations. Furthermore, more investigations on ternary mixtures with the aid of broad-band ultrasonic are necessary to show that the dy- namic scaling theory of Bhattacharjee-Ferrell applies also to those systems.

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