Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Poster Session 1 (joint session with BP)
CPP 19.2: Poster
Dienstag, 1. April 2014, 09:30–13:00, P1
Molecular Scale Structure of Ionic Liquid-Aqueous Solution Interfaces — •Xilin Wu1, Julian Mars1, Binyang Hou1,2, Veijo Honkimäki2, and Markus Mezger1,3 — 1Max-Planck-Institut für Polymerforschung, 55128 Mainz, Germany — 2European Synchrotron Radiation Facility, 38043 Grenoble, France — 3Johannes Guttenberg-Universität, 55128 Mainz, Germany
Ionic liquids (ILs) are widely used as environmental friendly solvents for liquid-liquid extraction processes. However only little is known on their molecular scale structure near fluid interfaces. We employed high energy x-ray reflectivity (XRR) to study the free surface and the buried IL-water interface of 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphat ([bmpy+] [FAP−]). The influence of metal cations on the interfacial structure was probed by adding cobalt ions ([Co2+][Cl2−]) to the aqueous phase. The Electron density profile across the IL-aqueous solution interface was extracted from the experimental XRR data. Its dependence on the interfacial potential was studied by time-resolved XRR measurements recorded during cyclic voltammetry. The data shows clear correlations between the applied voltage and the XRR intensity, indicating potential induced ion rearrangement at the liquid-liquid interface.