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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 62: Charged Soft Matter, Polyelectrolytes and Ionic Liquids III

CPP 62.10: Vortrag

Donnerstag, 15. März 2018, 12:00–12:15, C 243

Ionic Liquids in Nano-Confinement: Tuning and Suppressing Their Conduction in Nanoporous Metal-Organic Frameworks — Anemar Bruno Kanj, Rupal Verma, Modan Liu, Julian Helfferich, Wolfgang Wenzel, and •Lars Heinke — Karlsruhe Institute of Technology (KIT), Karlsruhe

Room-temperature ionic liquids (IL) are molten salts of organic molecules and possess outstanding physical and chemical properties. In addition to uses as unique solvents and in catalysis, it may find applications in electronics, sensors and batteries, where the properties under confinement are important. Metal-organic frameworks (MOFs) are nanoporous, crystalline hybrid materials composed of metal ions connected by organic linker molecules.

Here, we investigate the conduction properties of 1-butyl-3-methylimidazolinium bis(trifluoronethylsulfonyl)-imide, referred to as [BMIM][NTf2], ionic liquid under nano-confinement in nanoporous MOFs of type HKUST-1. We use MOFs in form of well-defined, dense films prepared in a layer-by-layer manner, also referred to as SURMOFs.

It was experimentally found that the percentage of pore filling of [BMIM][NTf2] in HKUST-1 has a tremendous impact on the IL conduction properties. The conductivity and ion mobility decreases by three orders of magnitude when the pores of the MOFs are filled. Details of the conduction of IL in the nanopores are unveiled by detailed molecular dynamic (MD) simulations. Mutual pore blockage and transient jamming was found to be responsible for the conductivity drop.