Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.10: Poster
Montag, 1. April 2019, 17:30–19:30, Poster B1
Influence of hydrocarbons on the bulk and surface structure of ionic liquids — •Julian Mars1,2, Henning Weiss1, Veijo Honkimäki3, Bridget Murphy4,5, Markus Bier6,7, and Markus Mezger1,2 — 1Max Planck Institute for Polymer Research, Mainz — 2Institute of Physics and MAINZ Graduate School, Johannes Gutenberg University Mainz — 3ESRF The European Synchrotron, Grenoble — 4Institute of Experimental and Applied Physics, Kiel University — 5Ruprecht Haensel Laboratory, Kiel University — 6Max Planck Institute for Intelligent Systems, Stuttgart — 7University of Applied Sciences Würzburg-Schweinfurt
In supported ionic liquid (IL) phase catalysis, knowledge of the interfacial structure is essential to understand diffusion of reactants and products across IL/vapor interfaces. ILs composed of cations with long aliphatic side chains exhibit mesoscopic order and liquid crystalline mesophases. The solvate affinity to the ionic- and aliphatic domains of such ILs can strongly affect their structures adjacent to IL/vapor interfaces. We employ X-ray scattering techniques to investigate the bulk and near surface structure on the molecular length scale. For increasing alkane concentrations, we observe a shift of the first sharp diffraction peak to lower q-values. Originating from the mesoscopic order, this signature indicates aggregation of the non-polar alkanes in the aliphatic domains. Simultaneously, ionic liquid crystal transition temperatures decrease. At the surface, we observe the formation of adsorbate layers and surface induced smectic order.