Abstract
The influence of the interactions between ions on the glass properties of 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids is investigated by measuring the activation volume ΔV at different molecular volumes by varying the length of the cation alkyl chain. The activation volume is determined at room temperature from impedance spectroscopy measurements for increasing pressures maintained below the glass-transition pressure Pg. We show that the energy EΔV required to increase the volume by the amount ΔV against the internal pressure of the ionic liquid is well correlated with Pg, where an almost linear increase in Pg is observed with increasing EΔV. These results highlight the impact of intermolecular interactions on the glass properties, and suggest that the energy associated to ΔV could be related to the energy landscape in which the ions diffuse.
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