The Chiral Twist-Bend Nematic Phase (N*TB)

Rebecca Walker* (Corresponding Author), Damian Pociecha, John Mervyn David Storey, Ewa Gorecka, Corrie Thomas Imrie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)
4 Downloads (Pure)

Abstract

The twist‐bend nematic, NTB, phase has been observed for chiral materials in which chirality is introduced through a branched 2‐methylbutyl terminal tail. The chiral twist‐bend nematic phase, N*TB, is completely miscible with the NTB phase of the standard achiral material, CB6OCB. The N*TB phase exhibits optical textures with lower birefringence than those observed for the achiral NTB phase, suggesting an additional mechanism of averaging molecular orientations. The N*−N*TB transition temperatures for the chiral materials are higher than the NTB−N transition temperatures seen for the corresponding racemic materials. This suggests the double degeneracy of helical twist sense in the  phase is removed by the intrinsic molecular chirality. A square lattice pattern is observed in the N* phase over a temperature range of several degrees above the N*TB–N phase transition, which may be attributed to a non‐monotonic dependence of the bend elastic constant.
Original languageEnglish
Pages (from-to)13329-13335
Number of pages7
JournalChemistry : a European Journal
Volume25
Issue number58
Early online date5 Sept 2019
DOIs
Publication statusPublished - 17 Oct 2019

Bibliographical note

Acknowledgements
E.G. and D.P. acknowledge the support of the National Science Centre (Poland): (Grant Number 2016/22/A/ST5/00319). R.W. gratefully acknowledges The Carnegie Trust for the Universities of Scotland for funding the award of a PhD scholarship.

Keywords

  • liquid crystals
  • chirality
  • spontaneous symmetry breaking
  • twist-bend nematic phase
  • BEHAVIOR
  • LIQUID-CRYSTAL DIMERS
  • SYMMETRY-BREAKING

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