The behavior of conductivity dynamic modulus and its connection to thermodynamic bulk modulus in ionic liquids

摘要

In this paper, we investigate the interplay between the dynamics and thermodynamics of aprotic ionic liquids in the supercooled and normal liquid states. For this purpose, the conductivity dynamic modulusM sigma p-T, being defined as the ratio of activation energy (E-p) and activation volume (V-T), and its relation to bulk modulusB(T)under isobaric and isothermal conditions is examined. We found that both isobaric cooling and isothermal compression lead to an increase inM sigma p-T. Specifically,M sigma p-T(P)(T)rises linearly similar toB(T). Consequently, a direct linear relationship betweenM sigma p-T(P)(T)andB(T)is established under isothermal conditions.