Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Nonaqueous Liquid/Solid Interfaces
O 45.3: Talk
Wednesday, March 18, 2015, 12:00–12:15, HE 101
Alternating Ion Monolayering in Alkylimidazolium Ionic Liquids at the Solid-Liquid Interface — •Michael Klimczak1, Nicola Taccardi2, Johannes Will1, Matthias Weißer1, Peter Wasserscheid2 und Andreas Magerl1 — 1Lehrstuhl für Kristallographie und Strukturphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 2Lehrstuhl für Chemische Reaktionstechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
Room temperature ionic liquids (RTILs) in general – and molten alkylimidazolium–bis(trifluoromethylsulfonyl)imide ([CnMim][NTf2]) salts in particular – are promising chemicals in electrochemical application. With the current trend of downsizing technology, interfacial effects take over a dominant role in these systems.
Using specular X-ray reflectivity (XRR) we have therefore systematically studied the solid–ionic liquid interface of [CnMim][NTf2] RTILs and sapphire (0001) in dependance of the alkyl chainlength and temperature. We observe alternating cation/anion monolayers with an enrichment of [CnMim]+ cations close to the interface in all cases. However, the definition and extent of the observed structures varies with chainlength which can be attributed to a size match/mismatch between the anion and cation, leading to more/less compact packing of the molecules.