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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Poster Session 1 (joint session with BP)
CPP 19.1: Poster
Dienstag, 1. April 2014, 09:30–13:00, P1
The solid-liquid interface of ionic liquid solutions – Interfacial layering and solvent-induced screening — •Markus Mezger1,4, Heiko Schröder1, Peter Reichert1,4, Roland Roth2, Harald Reichert3, and Diego Pontoni3 — 1Max-Planck-Institut für Polymerforschung, 55128 Mainz, Germany — 2Eberhard Karls Universität, 72076 Tübingen, Germany — 3European Synchrotron Radiation Facility, 38043 Grenoble, France — 4Johannes Gutenberg Universität, 55128 Mainz, Germany
The influence of the polar, aprotic solvent propylene carbonate on the interfacial structure of the ionic liquid 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphat ([bmpy+] [FAP−]) on sapphire was investigated by high-energy x-ray reflectivity. Analysis of our experimental data revealed interfacial profiles comprised of alternating anion and cation enriched regions decaying gradually into the bulk liquid. With increasing solvent concentration, a decrease in the decay length of the interfacial layering structure was observed. Solvent molecules were found to accumulate laterally within the layers, hence screening the charges between like ions. The results are compared with the bulk structure of IL-solvent mixtures.