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Flow-assisted self-healing of the helical structure in a cholesteric liquid crystal

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posted on 05.08.2021, 10:41 by Jan-Christoph Eichler, Robert A. Skutnik, Marco MazzaMarco Mazza, Martin Schoen
We employ nonequilibrium molecular dynamics simulations to investigate the structure and dynamics of a cholesteric liquid crystal confined between atomically corrugated solid walls. By choosing walls normal to the helical axis, we can study systems with an arbitrary cholesteric pitch without exposing the cholesteric helix to a spurious stress. We investigate the effects of local heating and flow and their joint effects. A steady-state laminar Poiseuille flow is initiated by means of an external body force. Flow alone (i.e., without local heating) in a direction normal to the helical axis does not affect the cholesteric pitch. If the liquid crystal is heated in a small region, the cholesteric helix becomes unstable and melts locally. However, if local heating and flow are combined, a nontrivial synergistic effect is observed in that the helical structure recuperates the better, the higher the speed of the flow is.

Funding

Institut für Chemie at Technische Universität Berlin

History

School

  • Science

Department

  • Mathematical Sciences

Published in

The Journal of Chemical Physics

Volume

155

Publisher

AIP

Version

AM (Accepted Manuscript)

Rights holder

© AIP Publishing

Publisher statement

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Eichler, J-C. ... et al., 2021. Flow-assisted self-healing of the helical structure in a cholesteric liquid crystal. The Journal of Chemical Physics, 155: 054903 and may be found at https://doi.org/10.1063/5.0058745

Acceptance date

22/07/2021

Publication date

2021-08-04

Copyright date

2021

ISSN

0021-9606

eISSN

1089-7690

Language

en

Depositor

Dr Marco Mazza. Deposit date: 4 August 2021

Article number

054903

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