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5 Experimental Verification of Dynamic Scaling Theories and Discussions

where L0 denotes the self diffusion coefficient, with the mole fraction of components A, B, xA,xB and the cross correlation functions and fAB and the auto correlation functions fAA, fBB. Q is a thermodynamic factor. However, an analytical calculations of the self diffusion coefficients of the system (TEA-H2O) are not possible, owning to the nonavailability of the velocity cross correlation functions of the solution. In order to verify the presented results, additional literature data [138] of concentration- dependent broad band ultrasonic have been reevaluated. The results of the low frequency term, relaxation time τD2 versus mole fraction of TEA, are displayed in Fig.(5.39). The values are somewhat lager than previous data. Unfortunately, no information on the purity of TEA used in [138] is given. Furthermore, the critical temperature with (Tc = 17.6 oC) is somewhat smaller than then one of this thesis (Tc = 18.21 oC). Nevertheless, qualitatively this result shows that critical slowing down of chemical relaxation occurs also in that process.

5.7 Ternary system nitroethane-3-methylpentane-cyclohexane

The investigations on binary systems without complex contributions presented in Section (5.3), have motivated to study of ternary mixtures within the framework of Bhattacharjee- Ferrell theory as well as the crossover formalism. Especially, due to the availability of ex- perimental data for the binary systems nitroethane-cyclohexane (NE-CH) and nitroethane- 3-methylpentane (NE-3MP), it is interesting to examine the nature of a critical ternary mixture nitroethane-3-methylpentane-cyclohexane (NE-3MP-CH). The investigated ternary mixture belongs to the phase diagrams of type 2a (Sec.(2.4.2)). The aim of this study, in addition to the verification of the dynamic scaling hypothesis, is to compare the behavior of critical values in dependence of the concentration of the additional third component. Therefore, a careful investigation of the ternary phase diagram was performed, to verify the location of the plait line as well as of the col point. In present thesis the solvent (3MP) plays the role of the additional third component. The significant plait points of investiga- tions are shown in Fig.(5.40) and the corresponding values are listed in Table (5.6) or in Table (5.5), respectively. The procedure of determination of the plait point line is based on the same procedure as for binary mixtures, namely the equal volume criterion. The studies in this thesis focused on the binary mixtures (NE-CH), (NE-3MP) as presented in Section (5.3), as well as on the ternary mixtures with the composition of non-col points α′, α′′,

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