title: Calorimetric Studies and Structural Aspects of Ionic Liquids in Designing Sorption Materials for Thermal Energy Storage.
abstract: The thermal properties of a series of twenty-four ionic liquids (ILs) have been determined by isothermal titration calorimetry (ITC) with the aim of simulating processes involving water sorption. For eleven water-free ILs, the molecular structures have been determined by X-ray crystallography in the solid state, which have been used to derive the molecular volumes of the ionic components of the ILs. Moreover, the structures reveal a high prevalence of hydrogen bonding in these compounds. A relationship between the molecular volumes and the experimentally determined energies of dilution could be established. The highest energies of dilution observed in this series were obtained for the acetate-based ILs, which underlines their potential as working fluids in sorption-based thermal energy storage systems.
authors.affiliation: Universität Kassel, Institut für Chemie und CINSaT, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany.
authors.forename: Thorge
authors.initials: T
authors.lastname: Brünig
authors.affiliation: Universität Kassel, Institut für Chemie und CINSaT, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany.
authors.forename: Kristijan
authors.initials: K
authors.lastname: Krekić
authors.affiliation: Universität Kassel, Institut für Chemie und CINSaT, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany.
authors.forename: Clemens
authors.initials: C
authors.lastname: Bruhn
authors.affiliation: Universität Kassel, Institut für Chemie und CINSaT, Heinrich-Plett-Strasse 40, 34132, Kassel, Germany. pietschnig@uni-kassel.de.
authors.forename: Rudolf
authors.initials: R
authors.lastname: Pietschnig
keywords: X-ray diffraction; ionic liquids; isothermal titration calorimetry; molecular volume; water sorption