Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.2: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Photonic Crystal Fibres Coated with Ionic Liquids in a Surface Science Approach — •Florian Rietzler1, Till Cremer1, Alexey Deyko1, Florian Maier1, Mathias Schmidt2, Bastian Etzold2, Peter Wasserscheid2, and Hans-Peter Steinrück1 — 1Lehrstuhl für Physikalische Chemie II, Egerlandstr. 3, 91058 Erlangen — 2Lehrstuhl für Chemische Reaktionstechnik, Egerlandstr. 3, 91058 Erlangen
Ionic liquids (ILs), organic salts with melting points below 100 °C, are often denoted as "green" solvents because of their extremely low vapour pressure. In catalysis one major problem of ILs is related to their high viscosity-induced mass transfer limitations. In the so-called Supported Ionic Liquid Phase concept this problem can be overcome by immobilizing a thin layer of IL on a solid support. Transferring this concept to Photonic Crystal Fibres (PCFs), i.e. coating the inner surface of light transmitting PCFs with a thin IL film, potentially allows in-situ monitoring of chemical reactions. Until now, the morphology of the IL film and the IL-glass interface is not well understood. In a surface science approach ultrathin films of the IL 1,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide were evaporated onto flat silica glass (as a model for the PCF surface) and investigated by ARXPS. In order to overcome the observed island formation of the IL on pristine Suprasil, two types of surface modifications were performed, both leading to a better wetting. This work was supported by DFG-SPP1191 and the Cluster of Excellence "Engineering of Advanced Materials".