Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Charged Soft Matter, Polyelectrolytes and Ionic Liquids II
CPP 50.3: Vortrag
Mittwoch, 14. März 2018, 15:30–15:45, C 243
Solvate induced surface order in ionic liquids — •Julian Mars1,2, Henning Weiss2, Sven Festersen3, Bridget Murphy3, Veijo Honkimäki4, Markus Bier5, and Markus Mezger1,2 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2Institute of Physics and MAINZ Graduate School, Johannes Gutenberg University Mainz, Germany — 3Institute of Experimental and Applied Physics, Kiel University, Germany — 4ESRF The European Synchrotron, Grenoble, France — 5Max Planck Institute for Intelligent Systems, Stuttgart, Germany
In supported ionic liquid (IL) phase catalysis, the chemical reaction takes place in a sub-micrometer IL film, wetting a solid support material with high surface area. To understand diffusion of reactants and products across the IL/vapor interface, knowledge of the interfacial structure is crucial. We employ X-ray scattering techniques to investigate the near surface structure on the molecular length scale. In microheterogeneous ILs, solvates aggregates site-specifically within high affinity domains. Non-polar molecules are preferentially situated in the aliphatic regions, affecting the near surface structure. For different classes of binary model systems, we observe the formation of adsorbate layers and solvate induced surface phase transitions.