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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 58: Fluids and Interfaces II

CPP 58.4: Hauptvortrag

Donnerstag, 23. März 2017, 11:00–11:30, ZEU 255

Molecular Scale Structure of Ionic Liquid Surfaces — •Markus Mezger — Institut für Physik, Johannes Gutenberg-Universität Mainz — Max-Planck-Institut für Polymerforschung, Mainz

Ionic Liquids (ILs) are promising candidates in a variety of applications such as heterogeneous catalysis. For understanding and optimizing the transport properties of reactants and products at IL interfaces, knowledge of their interfacial structure on the molecular length scale is highly desirable. Our x-ray reflectivity (XRR) studies of IL based electrolytes provide density profiles across liquid/vapor interfaces with sub-nanometer resolution. Depending on the molecular architecture of anions and cations, we observe the pinning of bulk correlations at the surface and surface induced smectic order. As model system for blends containing dielectric solvents, we studied the near surface structure of an alkane containing IL. Analysis of the experimental data revealed surface segregation of the alkanes that induce ordered structures, affecting the interfacial ion profiles over a length scale up to 50 nm.
M. Mezger et al., Proc. Natl. Acad. Sci. USA 110, 3733 (2013).
M. Mezger, et al., J. Chem. Phys. 142, 164707 (2015).