Probing anomalous underscreening with a protic ionic liquid between charged interfaces Y.K. Catherine Fung, Susan Perkin Physical and Theoretical Chemistry Laboratory, University of Oxford, UK The vast possibilities presented by ionic liquids enables them to have diverse applications in areas such as solvent extraction, energy storage, and carbon dioxide capture. Despite the increasing interest in their applications, their properties, in particular, their electrical properties near charged interfaces, are not well understood. An anomalous long-range interaction which deviates from the predictions of the Debye-Hückel theory, has been observed in concentrated electrolytes (termed underscreening), including in ionic liquids. In order to probe the character of these long-range interactions, we present surface forces measurements across thin films of a protic ionic liquid, ethylammonium nitrate, at different concentrations in water between mica surfaces. These results are important for understanding the physics of concentrated electrolytes and aid the interpretation of the anomalous underscreening. References 1. M. Gebbie et al. , Proceedings of the National Academy of Sciences, 2015, 112 , 7432 2. N. Hjalmarsson et al. , Chemical Communications, 2017 , 53, 647
3. A.M. Smith et al. , The Journal of Physical Chemistry Letters, 2016 , 7, 2157 4. S. Kumar et al. , Journal of Colloid and Interface Science, 2022 , 622, 819 5. R. Horn et al. , The Journal of Physical Chemistry, 1988 , 92, 3531
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