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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Charged Soft Matter - organized by Joachim Dzubiella (Albert Ludwigs University Freiburg, Freiburg)
CPP 16.2: Talk
Wednesday, March 24, 2021, 09:40–10:00, CPPa
Structure and Relaxation Dynamics of an Ionic Liquid in Molecular Scale Confinement. — •Markus Mezger1, Henning Weiss1, Julian Mars1, Hsiu-Wei Cheng2, Markus Valtiner2, and Veijo Honkimaeki3 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2TU Wien, Institute for Applied Physics, Vienna, Austria — 3ESRF-The European Synchrotron, Grenoble, France
Structure and dynamics of a confined ionic liquids were probed by an in-situ X-ray surface force apparatus in plane-cylinder geometry. Our novel device can shear, compress and decompress soft matter within a precisely controlled slit pore confinement. Complementary structural information is obtained by X-ray scattering and simultaneous force measurements. Here, we present results from the wet ionic liquid C10mim+Cl− in its columnar liquid crystalline mesophase. Defect-formation and structural relaxation processes in confinement were studied as reaction to external stimuli. The observed mesoscopic orientation induced by oscillatory shear is explained by the anisotropic mobility of the amphiphilic cations.
Reference: H. Weiss et al., Structure and Dynamics of Confined Liquids - Challenges and Perspectives for the X-Ray Surface Force Apparatus. Langmuir, DOI: 10.1021/acs.langmuir.9b01215 (2019).