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Title: Defect topologies in chiral liquid crystals confined to mesoscopic channels

Abstract

We present Monte Carlo simulations in the grand canonical and canonical ensembles of a chiral liquid crystal confined to mesochannels of variable sizes and geometries. The mesochannels are taken to be quasi-infinite in one dimension but finite in the two other directions. Under thermodynamic conditions chosen and for a selected value of the chirality coupling constant, the bulk liquid crystal exhibits structural characteristics of a blue phase II. This is established through the tetrahedral symmetry of disclination lines and the characteristic simple-cubic arrangement of double-twist helices formed by the liquid-crystal molecules along all three axes of a Cartesian coordinate system. If the blue phase II is then exposed to confinement, the interplay between its helical structure, various anchoring conditions at the walls of the mesochannels, and the shape of the mesochannels gives rise to a broad variety of novel, qualitative disclination-line structures that are reported here for the first time.

Authors:
; ;  [1];  [1];  [2]
  1. Stranski-Laboratorium für Physikalische und Theoretische Chemie, Technische Universität Berlin, Sekr. C7, Straße des 17. Juni 135, Berlin 10623 (Germany)
  2. (United States)
Publication Date:
OSTI Identifier:
22415807
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 142; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CARTESIAN COORDINATES; CHIRALITY; COMPUTERIZED SIMULATION; CONFINEMENT; COUPLING CONSTANTS; LIQUID CRYSTALS; MOLECULES; MONTE CARLO METHOD; SYMMETRY; THERMODYNAMICS; TOPOLOGY

Citation Formats

Schlotthauer, Sergej, E-mail: s.schlotthauer@mailbox.tu-berlin.de, Skutnik, Robert A., Stieger, Tillmann, Schoen, Martin, and Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695. Defect topologies in chiral liquid crystals confined to mesoscopic channels. United States: N. p., 2015. Web. doi:10.1063/1.4920979.
Schlotthauer, Sergej, E-mail: s.schlotthauer@mailbox.tu-berlin.de, Skutnik, Robert A., Stieger, Tillmann, Schoen, Martin, & Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695. Defect topologies in chiral liquid crystals confined to mesoscopic channels. United States. doi:10.1063/1.4920979.
Schlotthauer, Sergej, E-mail: s.schlotthauer@mailbox.tu-berlin.de, Skutnik, Robert A., Stieger, Tillmann, Schoen, Martin, and Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695. Thu . "Defect topologies in chiral liquid crystals confined to mesoscopic channels". United States. doi:10.1063/1.4920979.
@article{osti_22415807,
title = {Defect topologies in chiral liquid crystals confined to mesoscopic channels},
author = {Schlotthauer, Sergej, E-mail: s.schlotthauer@mailbox.tu-berlin.de and Skutnik, Robert A. and Stieger, Tillmann and Schoen, Martin and Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27695},
abstractNote = {We present Monte Carlo simulations in the grand canonical and canonical ensembles of a chiral liquid crystal confined to mesochannels of variable sizes and geometries. The mesochannels are taken to be quasi-infinite in one dimension but finite in the two other directions. Under thermodynamic conditions chosen and for a selected value of the chirality coupling constant, the bulk liquid crystal exhibits structural characteristics of a blue phase II. This is established through the tetrahedral symmetry of disclination lines and the characteristic simple-cubic arrangement of double-twist helices formed by the liquid-crystal molecules along all three axes of a Cartesian coordinate system. If the blue phase II is then exposed to confinement, the interplay between its helical structure, various anchoring conditions at the walls of the mesochannels, and the shape of the mesochannels gives rise to a broad variety of novel, qualitative disclination-line structures that are reported here for the first time.},
doi = {10.1063/1.4920979},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 19,
volume = 142,
place = {United States},
year = {2015},
month = {5}
}