Forces and structure in Ionic liquid mixtures Timothy Groves 2 and Susan Perkin 1 1 University Of Oxford Chemistry Department, UK, 2 University of Oxford, UK
Ionic liquids, salts that are liquid at or near to room temperature, are often thought of as ‘designer solvents’; they can be optimized by choosing a cation and an anion, or by mixing liquids, in order to select for specific properties [1] . In light of this, much work has been done to understand the properties of these liquids. In particular, ionic liquids have been shown to adopt layered structures at charged interfaces, with the nature of the structure depending on features within the ions such as the alkyl chain length [2] . We have investigated structural forces of mixtures of short- and long-chain ionic liquids using the surface force balance. We find that the pure liquids can be described using a simple decaying oscillatory force law, however we observed more complex behaviour with liquid mixtures. We interpret these forces as arising from contributions from the pure liquids, and by combining contributions from the pure liquids are able to obtain fits of the forces in the mixtures. These results will be important in the further design of ionic liquids and in the interpretation of liquid mixture behaviour [3] . References 1. H. Niedermeyer, J. P. Hallett, I. J. Villar-Garcia, P. A. Hunt, T. Welton, Chem. Soc. Rev., 41 , 7780-7802 (2012) 2. S. Perkin, L. Crowhurst, N. Niedermeyer, T. Welton, A. M. Smith, N. N. Gosvami, Chem. Commum., 47 , 6572-6574 (2011) 3. R. Kjellander, Phys. Chem. Chem. Phys. , 22 , 23952-23985 (2020)
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