Abstract
A new physical quantity N B is proposed to analyze the transport properties of ionic liquids. The quantity, which is defined from our model of viscosity, the bond strength – coordination number fluctuation (BSCNF) model, quantifies the degree of cooperativity among the constituent elements in viscous liquids. It is shown that the new quantity N B provides additional information to the conventional transport coefficients such as viscosity, diffusion coefficient, and ionic conductivity. In the present work, the temperature dependence of the activation energies for the diffusion coefficient and the cooperativity described by N B are discussed for several kinds of ionic liquids. The result obtained suggests that the activation energies for the diffusion coefficient and N B are strongly correlated.
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