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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster Session III
CPP 50.20: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1C
Surfaces of ionic liquid mixtures studied by temperature-dependent ARXPS — •Ulrike Paap, Bettina Heller, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, FAU Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
Ionic liquids (ILs) are characterized by a low melting point, low vapor pressure and low surface tension. Many ILs carrying fluorinated moieties exhibit high gas solubility together with chemical and thermal stability. Such properties are beneficial for a potential substitution of fluorinated organic compounds in many areas such as gas absorbents, refrigerants, lubricants and surfactants.
In this work, we studied various mixed IL systems in the liquid state at different temperatures with angle-resolved X-ray photoelectron spectroscopy (ARXPS). Thereby, we investigated the surface composition of the topmost nanometers of these mixtures. All ILs studied consist of the same hexafluorophosphate anion ([PF6]−) and feature a selection of different fluorinated and non-fluorinated imidazolium cations. Our results allows for a deeper understanding of enrichment and molecular orientation processes at the outermost surface of these mixed IL systems.
U.P., B.H., F.M. and H.P.S. thank the European Research Council (ERC) for financial support of this research in the context of an Advanced Investigator Grant to H.P.S. (693398-ILID).