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5.6 Systems with complex background contributions

Figure 5.39: Relaxation time of the low frequency relaxation term of (TEA-H2O) versus mole fraction of TEA. ((◦) 10 oC, (□) 15 oC, (♦) 17 oC); Results from reevaluation of literature data [138].

cients: self-and mutual diffusion coefficients. The self-diffusion coefficient describes the mobility of individual molecule in the mixtures and it is defined for each component in a mixture. In [137], it was reported that the mutual diffusion coefficient is a collective property, which controls the mixing of the two components of a binary liquid. The pro- tolysis reaction belongs to the types of reactions that are governed by the self diffusion coefficient. Smoluchowski has presented a relation between the forward (or backward) rate constant kdif f , controlled by the self diffusion coefficient DA of components A and DB of component B:

where rAB = rA + rB denotes the minimal distance of interaction. The coupling between the self diffusion and mutual diffusion has been discussed in the literature [137] in the case of the system ethanol-water. According to that coupling, the mutual diffusion coeffi- cient can be expressed as:

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