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5.3 Binary systems without and with one additional noncritical relaxation term

Figure 5.8: Plot of the diffusion coefficient D of the binary system (n-PE-NM) versus reduced temperature ε. The line is the graph of Eq.(4.35).

plots of the correlation length ξ versus ε of the systems (NE-CH), (NE-3MP), and (ET- DOD) are compared with each other. According to, the frequently used power law:

with the critical exponent ˜ν, and the amplitudes ξ0 = 0.160 nm for (NE-CH), ξ0 = 0.230 nm for (NE-3MP) and ξ0 = 0.370 nm for (ET-DOD). A plot of the diffusion coefficient versus reduced temperature of the example (n-PE-NM) is given in Fig.(5.8). The mutual diffusion coefficient, is also assumed to consist of a singular part ∆D and a background part Dbg, as was presented in Eq.(4.33), and likewise depends on parameters ξ, qD, and qc. Another bilogarithmic plot of the diffusion coefficient of the same mixture versus reduced temperature ε is given in Fig.(5.6), where also the power law:

is shown . Here ν∗= 0.664 denotes the critical exponent from mode coupling theory.

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