Abstract
Precise resistivity ρ (Ω cm) and viscosity η (10 −2 P) measurements for isobutyric acid–water (IBAW) critical mixtures with added K + and Cl − ions have been performed in the Arrhenius temperature domain of the electrolyte. From the activation energy, the resistivity–viscosity relation reveals a fraction power character over the whole range of parameters investigated. To analyze our data we have used an exponential formula derived from the equivalent Arrhenius law: ρ/ T is proportional to ( η/ T) R , where R = E ρ / E η is the ratio between the resistivity and viscosity activation energies. In the case of the pure system (IBAW), the value of R is in vicinity of 1, but when the salt is added, the ratio R shows dependence on the (K +, Cl −) concentrations: 0.6 < R < 1. The domain of the validity of R is in conformity with the theoretical prediction. The Coulombic interaction is the origin of the deviation.
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