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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Ionic Liquids and Water

CPP 33.6: Vortrag

Mittwoch, 9. März 2016, 11:15–11:30, H40

Impact of water on the charge transport of a glass-forming ionic liquid — •Pit Sippel, Victoria Dietrich, Daniel Reuter, Peter Lunkenheimer, Alois Loidl, and Stephan Krohns — Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany

Ionic liquids are salts showing melting temperatures below 100^∘C. These materials exhibit a variety of technically important physical and chemical properties, like electrochemical stability, low volatility, flame retardancy and ionic conductivity. Together with the immense number of ion combinations available for those ionic liquids, this makes them viable candidates for numerous applications, e.g., as electrolytes in energy applications, where their intrinsic ionic conductivity is an important feature [1]. However, water (and thus also ambient humidity) play a crucial role for the physical properties of ionic liquids, especially for the conductivity when hydrophilic anions are involved [2]. Using broadband dielectric spectroscopy and differential scanning calorimetry, we have investigated in detail the impact of small water volume-fractions on the conductivity and dynamical glass-properties of 1-Butyl-3-methyl-imidazolium chloride. We demonstrate that, by only slightly increasing the water content, glass transition temperature and conductivity are strongly enhanced and the dipolar dynamics are accelerated.

[1] D. R. MacFarlane, et al., Energy Environ. Sci. 7, 232-250 (2014). [2] J. G. Huddleston, et al., Green Chem. 3, 156-164 (2001).