Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 33: Solid-Liquid Interfaces III

O 33.5: Talk

Tuesday, April 2, 2019, 15:00–15:15, H10

Ion Exchange at the Liquid/Solid Interface in Ultrathin Ionic Liquid Films on Ag(111) — •Matthias Lexow, Bettina Heller, Radha G. Bhuin, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

In the context of ionic liquid (IL) thin film applications, we studied mixed IL systems with respect to surface and interface ion distribution by angle-resolved X-ray photoelectron spectroscopy (ARXPS) as a function of anion, cation, composition, and temperature. By in-situ physical vapor deposition, ultrathin layers of two ILs were successively deposited on Ag(111) as model support. By temperature-dependent ARXPS, we found pronounced surface and interface enrichment effects due to rapid ion exchange processes that are proposed to be driven by the interplay of interface adsorption energy and surface free energy in these films.

Supported by the European Research Council (ERC) through an Advanced Investigator Grant to HPS (No. 693398–ILID).

Lexow et al., ChemPhysChem, 2018, DOI: 10.1002/cphc.201800773.

Lexow et al., Langmuir, 2018, submitted.