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  Role of stringlike, supramolecular assemblies in reentrant supernematic liquid crystals

Mazza, M. G., Greschek, M., Valiullin, R., & Schoen, M. (2011). Role of stringlike, supramolecular assemblies in reentrant supernematic liquid crystals. Physical Review E, 83(5): 051704. doi:10.1103/PhysRevE.83.051704.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-B43F-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-22AA-F
Genre: Journal Article

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 Creators:
Mazza, Marco G.1, Author              
Greschek, Manuel, Author
Valiullin, Rustem, Author
Schoen, Martin, 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: Using a combination of isothermal-isobaric Monte Carlo and microcanonical molecular dynamics we investigate the relation between structure and self-diffusion in various phases of a model liquid crystal using the Gay-Berne-Kihara potential. These molecules are confined to a mesoscopic slit pore with atomically smooth substrate surfaces. As reported recently [seeM. G. Mazza et al., Phys. Rev. Lett. 105, 227802 (2010)], a reentrant nematic (RN) phase may form at sufficiently high pressures and densities. This phase is characterized by a high degree of nematic order and a substantially enhanced self-diffusivity in the direction of the director n∧ that exceeds that of the lower-density nematic and an intermittent smectic-A phase by about an order of magnitude. Here we demonstrate that the unique transport behavior in the RN phase may be linked to a confinement-induced packing effect that causes the formation of supramolecular, stringlike conformations. The strings consist of several molecules traveling in the direction of n∧ as individual “trains” consisting of chains of molecular “cars.”

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Language(s): eng - English
 Dates: 2011-05-132011
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1103/PhysRevE.83.051704
BibTex Citekey: mazza_role_2011
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Title: Physical Review E
Source Genre: Journal
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Publ. Info: Melville, NY : American Physical Society
Pages: 14 Volume / Issue: 83 (5) Sequence Number: 051704 Start / End Page: - Identifier: ISSN: 1539-3755
CoNE: /journals/resource/954925225012