1*/ Viscosity of numerous of liquids or it's mixtures obey to the Arrhenius behavior. it means that the corresponding activation energy (Ea) is constant. How can we explain this constance?
2*/ In other cases, we found the behavior of other liquid deviate to the this Arrhenius-type equation. Some investigators use generally the Vogel-Fulcher-Tammann equation. But few of researchers use the Arrhenius-type equation with the feature that (Ea) depends on temperature. Can we explain how or why the activation energy depends on temperature?
An excellent account of the temperature dependence of viscosity for polar organic liquids is given in a recent paper by Petrowsky, Fleshman and Frech: J Phys Chem B_2013, 117, 2971−2978. This paper also gives a brief but good review of temperature dependent viscosity studies of liquids leading to Arrhenius-like behavior for temperature effects, including free volume theory and transition state theory approaches.
we can justified the deponds of activation energy on tempéraature because of the variation of the interaction between the components and the formation of clusters which vary allow the activation energy
An excellent account of the temperature dependence of viscosity for polar organic liquids is given in a recent paper by Petrowsky, Fleshman and Frech: J Phys Chem B_2013, 117, 2971−2978. This paper also gives a brief but good review of temperature dependent viscosity studies of liquids leading to Arrhenius-like behavior for temperature effects, including free volume theory and transition state theory approaches.
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