SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session II: Poster to Mini-Symposium: Molecular scale investigations of liquid-vapor interfaces I

O 27.1: Poster

Montag, 1. März 2021, 13:30–15:30, P

Temperature-dependent trapping probability measurements of n-butane on ionic liquid surfaces using molecular beam techniques — •Leonhard Winter, Radha G. Bhuin, Matthias Lexow, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

Ionic Liquids (ILs) are room temperature liquids consisting only of cations and anions. IL thin films are the key components in the catalytic concepts Supported Ionic Liquid Phase (SILP) and Solid Catalyst with Ionic Liquid Layer (SCILL), for which the transfer of hydrocarbons through the ionic liquid/gas interface plays a crucial role.

We have built a new ultra-high vacuum apparatus dedicated for the investigations of ILs with molecular beam techniques. It was used to study the first step of the interaction dynamics of n-butane on a series of alkylimidazolium ionic liquids with varying chain lengths and anions ([CnC1Im][X]). Based on the temperature-dependent behavior of the initial trapping probability at low temperatures, measured by the direct method of King and Wells, we found that the binding energy is dominated by the interaction with the alkyl chain of the cation, whereas the ionic headgroups contribute only weakly.

L.W., R.G.B, M.L. 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 (No. 693398-ILID).

Bhuin et al., Angew. Chem. Int. Ed., 2020, 59, 14429-14433.

Winter et al., J. Chem. Phys., 2020, 153, 214706.