Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.1543
Publisher DOI: 10.1103/PhysRevLett.120.067801
arXiv ID: 1801.07605v1
Title: Quantized self-assembly of discotic rings in a liquid crystal confined in nanopores
Language: English
Authors: Sentker, Kathrin 
Zantop, Arne 
Lippmann, Milena 
Hofmann, Tommy 
Seeck, Oliver H. 
Kityk, Andriy V. 
Yildirim, Arda 
Schönhals, Andreas 
Mazza, Marco G. 
Huber, Patrick 
Keywords: Soft Condensed Matter;Mesoscopic Systems and Quantum Hall Effect;Materials Science;Statistical Mechanics;Chemical Physics
Issue Date: 5-Feb-2018
Publisher: American Physical Society
Source: Physical Review Letters 120, 067801 (2018) 6
Journal or Series Name: Physical Review Letters 
Abstract (english): 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
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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