Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 64: Nanostructures, Nanostructuring and Nanosized Soft Matter II
CPP 64.5: Vortrag
Donnerstag, 15. März 2018, 10:30–10:45, PC 203
Self-Assembly of Discotic Rings and Nanowires in a Liquid Crystal Confined in Nanopores — •Kathrin Sentker1, Arne Zantop2, Arda Yildirim3, Milena Lippmann4, Tommy Hofmann5, Oliver Seeck4, Andriy Kityk6, Andreas Schönhals3, Marco Mazza2, and Patrick Huber1 — 1Institut für Werkstoffphysik und -technologie, TU Hamburg — 2MPI für Dynamik und Selbstorganisation — 3BAM,Berlin — 4DESY,Hamburg — 5HZG für Materialien und Energie — 6Faculty of Electrical Engineering, TU Czestochowa
Discotic Liquid Crystals (DLC) tend to stack up into linear columns creating charge carrier pathways along the stacking direction due to overlapping pi - electrons. Embedding DLCs into nanoporous membranes enables the preparation of organic molecular nanowires or nanorings. We show by high-resolution optical birefringence and synchrotron-based X-ray diffraction, as well as Monte Carlo simulations, that confining a thermotropic DLC in cylindrical silica nanopores induces a quantized formation of annular layers consisting of concentric circular bent columns, unknown in the bulk state [1]. Starting from the walls this ring self-assembly propagates layer-by-layer towards the pore center. In addition, we found a pore size dependent orientational transition from the circular to axial orientation in anodic aluminum oxide nanopores allowing the preparation of semiconductive organic nanowires. [1] Sentker et al., Quantized Self-Assembly of Discotic Rings in a Liquid Crystal Confined in Nanopores, 2017, submitted