Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 79: Wetting, Microfluidics and Confined Liquids II
CPP 79.3: Vortrag
Freitag, 16. März 2018, 10:00–10:15, PC 203
Structure and Dynamics of Confined Liquids Studied by an X-ray Surface Force Apparatus — •Henning Weiss1, Hsiu-Wei Cheng2, Julian Mars1,3, Claudia Merola2, Veijo Honkimäki4, Markus Valtiner2, and Markus Mezger1,3 — 1Max Planck Institut for Polymer Research, Mainz, Germany — 2TU Wien, Institute for Applied Physics, Wien, Austria — 3Johannes Gutenberg University Mainz, Institute of Physics, Mainz, Germany — 4ESRF-The European Synchrotron, Grenoble, France
Structure and dynamics of confined liquids were probed by an in-situ X-ray surface force apparatus in plane-cylinder geometry. Our novel device can shear and compress/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 on the structural relaxation of confined liquid crystals (LCs) as reaction to external stimuli. For the smectic LC 8CB we investigated defect-formation and relaxation processes during subsequent compression and decompression cycles. In the second example, an 80 nm thin film of the wet ionic liquid [ C10 mim ]+ [ Cl ]− in the columnar LC phase was sheared. The observed mesoscopic orientation induced by oscillatory shear is explained by the anisotropic mobility of the mesogens.