Impact of water on the charge transport of a glass-forming ionic liquid
2016
Abstract Using
dielectric spectroscopyand differential scanning calorimetry, we have performed a detailed investigation of the influence of water uptake on the translational and reorientational glassy dynamics in the typical ionic liquid 1-Butyl-3-methyl-
imidazolium chloride. From a careful analysis of the measured dielectric permittivity and conductivity spectra, we find a significant acceleration of cation reorientation and a marked increase of the ionic conductivity for higher
water contents. The latter effect mainly arises due to a strong impact of
water contenton the glass temperature, which for the well-dried material is found to be larger than any values reported in literature for this system. The fragility, characterizing the non-Arrhenius glassy dynamics of the ionic subsystem, also changes with varying
water content. Decoupling of the ionic motion from the
structural dynamicshas to be considered to explain the results.
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