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O: Fachverband Oberflächenphysik

O 6: New Methods: Experiments and Theory

O 6.2: Talk

Monday, March 27, 2023, 10:45–11:00, GER 39

Insights on the Liquid/vacuum interface of ionic liquids by ARXPS and UHV Pendant Drop — Ulrike Paap, •Afra Gezmis, Florian Maier, and Hans-Peter Steinrück — Friedrich-Alexander Universität, Erlangen, Germany

Ionic liquids (ILs) are characterized by a low melting point and a low vapor pressure. Many ILs exhibit high gas solubility along a high chemical and thermal stability. Such properties are beneficial in many areas such as gas absorbents, refrigerants, lubricants, antistatics and surfactants. The low vapor pressure of ILs opens the possibility to investigate them under ultra-high vacuum (UHV) conditions. In this context, angle-resolved X-ray photoelectron spectroscopy (ARXPS) has already proven to be a particularly powerful tool. We now combine information on the surface composition derived from ARXPS and measurements of the surface tension performed under ultraclean conditions with our new pendant drop setup, which operates in UHV. Our results allow for a deeper understanding of enrichment and molecular orientation processes at the outermost surface of these systems on the microscopic and the macroscopic scale. This work was supported by the Collaborative Research Center (CRC) 1452: Catalysis at Liquid Interfaces.