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Verlagslink: http://arxiv.org/abs/1801.07605v1
Verlagslink DOI: 10.1103/PhysRevLett.120.067801
Titel: Quantized self-assembly of discotic rings in a liquid crystal confined in nanopores
Sprache: English
Autor/Autorin: Sentker, Kathrin 
Zantop, Arne 
Lippmann, Milena 
Hofmann, Tommy 
Seeck, Oliver H. 
Kityk, Andriy V. 
Yildirim, Arda 
Schoenhals, Andreas 
Mazza, Marco G. 
Huber, Patrick 
Schlagwörter: Soft Condensed Matter;Mesoscopic Systems and Quantum Hall Effect;Materials Science;Statistical Mechanics;Chemical Physics
Erscheinungsdatum: 5-Feb-2018
Verlag: American Physical Society
Quellenangabe: Physical Review Letters 120, 067801 (2018) 6
Zeitschrift oder Schriftenreihe: Physical Review Letters 
Zusammenfassung (englisch): Disklike molecules with aromatic cores spontaneously stack up in linear columns with high, one-dimensional charge carrier mobilities along the columnar axes making them prominent model systems for functional, self-organized matter. We show by high-resolution optical birefringence and synchrotron-based X-ray diffraction that confining a thermotropic discotic liquid crystal in cylindrical nanopores induces a quantized formation of annular layers consisting of concentric circular bent columns, unknown in the bulk state. Starting from the walls this ring self-assembly propagates layer by layer towards the pore center in the supercooled domain of the bulk isotropic-columnar transition and thus allows one to switch on and off reversibly single, nanosized rings through small temperature variations. By establishing a Gibbs free energy phase diagram we trace the phase transition quantization to the discreteness of the layers' excess bend deformation energies in comparison to the thermal energy, even for this near room-temperature system. Monte Carlo simulations yielding spatially resolved nematic order parameters, density maps and bond-forientational order parameters corroborate the universality and robustness of the confinement-induced columnar ring formation as well as its quantized nature.
URI: http://tubdok.tub.tuhh.de/handle/11420/1546
DOI: 10.15480/882.1543
ISSN: 0031-9007
Institut: Werkstoffphysik und -technologie M-22 
Dokumenttyp: (wissenschaftlicher) Artikel
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