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17–19 Sept 2018
Fakultät für Maschinenwesen der Technischen Universität München
Europe/Berlin timezone

Structure and Dynamics of Confined Liquids Studied by an X-ray Surface Force Apparatus

17 Sept 2018, 16:30
1h 30m
Fakultät für Maschinenwesen der Technischen Universität München

Fakultät für Maschinenwesen der Technischen Universität München

Boltzmannstraße 15 85748 Garching b. München
Poster P2 Soft matter Poster session 1

Speaker

Markus Mezger (Johannes Gutenberg University Mainz, Institute of Physics)

Description

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, 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 on the structural relaxation of confined liquid crystals (LCs) as reaction to external stimuli. Experiments using high energy x-rays were performed at ID31, ESRF. For the smectic LC 8CB we investigated defect-formation and relaxation processes during subsequent compression and decompression cycles. In the second example, we investigate a thin film of the wet ionic liquid C10mim+Cl- in the columnar LC phase [1]. The observed mesoscopic orientation induced by oscillatory shear is explained by the anisotropic mobility of the amphiphilic cations.
References: [1] H.-W. Cheng et al., Langmuir 34, 2637 (2018)

Primary author

Markus Mezger (Johannes Gutenberg University Mainz, Institute of Physics)

Co-authors

Mrs Claudia Merola (TU Wien, Institute for Applied Physics) Dr Henning Weiss (Max Planck Institut for Polymer Research, Mainz) Dr Hsiu-Wei Cheng (TU Wien, Institute for Applied Physics) Mr Julian Mars (Max Planck Institut for Polymer Research, Mainz) Prof. Markus Valtiner (TU Wien, Institute for Applied Physics) Dr Veijo Honkimäki (ESRF-The European Synchrotron, Grenoble)

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