Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 21: Morphology Prediction at Interfaces: Theory meets Experiment
O 21.6: Poster
Monday, March 7, 2016, 18:15–20:30, Poster E
Molecular Structures of Dialkylimidazolium Ionic Liquids at the Hydroxylated Solid-Liquid Interface — •Michael Klimczak1, Zlatko Brkljača2,3, David M. Smith2,3, Ana-Sunčana Smith2,3,4, and Andreas Magerl5 — 1Chair of Crystallography and Structural Physics, FAU, Erlangen, Germany — 2Division of Organic Chemistry and Biochemistry, Institut Ruđer Bošković, Zagreb, Croatia — 3Cluster of Excellence Engineering of Advanced Materials, FAU, Erlangen — 4Institute for Theoretical Physics I, FAU, Erlangen, Germany — 5Chair of Biophysics, FAU, Erlangen, Germany
Dialkylimidazolium-based ionic liquids, salts with a melting point well below room temperature, are a fairly novel class of substances with a broad spectrum of potential applications, most notably as solvents or electrolytes in an electrochemical context. Molecalar structuring at the solid liquid interface, oftentimes playing a crucial role in small-scale systems, has previously been observed. Yet, no coherent explanation has been given to provide a better understanding of these phenomena.
Using a complementary approch of experimental X-ray reflectivity and molecular dynamics, we obtain atomic level detail of structuring at the solid-liquid interface of 1-alkyl-3-methylimidazolium bistriflimide ionic liquids. The interface region is dominated by cations, tightly attached to the substrate via hydrogen bonding and a two-dimensional long-range ordering can be observed. This structure is followed by interface normal, monomolecular layering of alternating anion and cation enrichment/depletion, extending about 40 Å into the bulk.