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  Quantized self-assembly of discotic rings in a liquid crystal confined in nanopores

Sentker, K., Zantop, A. W., Lippmann, M., Hofmann, T., Seeck, O. H., Kityk, A. V., et al. (2018). Quantized self-assembly of discotic rings in a liquid crystal confined in nanopores. Physical Review Letters, 120(6): 067801. doi:10.1103/PhysRevLett.120.067801.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-6E29-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-6E2A-7
Genre: Journal Article

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 Creators:
Sentker, Kathrin, Author
Zantop, Arne Wolf1, Author              
Lippmann, Milena, Author
Hofmann, Tommy, Author
Seeck, Oliver H., Author
Kityk, Andriy V., Author
Yildirim, Arda, Author
Schönhals, Andreas, Author
Mazza, Marco G.1, Author              
Huber, Patrick, Author
Affiliations:
1Group Non-equilibrium soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063308              

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 Abstract: Disklike molecules with aromatic cores spontaneously stack up in linear columns with high, onedimensional 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 bondorientational order parameters corroborate the universality and robustness of the confinement-induced columnar ring formation as well as its quantized nature.

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Language(s): eng - English
 Dates: 2018-02-052018-02-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.120.067801
 Degree: -

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Title: Physical Review Letters
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: 7 Volume / Issue: 120 (6) Sequence Number: 067801 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1