Twist-bend nematics, liquid crystal dimers, structure–property relations

Alya A. Dawood, Martin C. Grossel, Geoffrey R. Luckhurst*, Robert M. Richardson, Bakir A. Timimi, Neil J. Wells, Yousif Z. Yousif

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

38 Citations (Scopus)
86 Downloads (Pure)

Abstract

One of the current challenges in liquid crystal science is to understand the molecular factors leading to the formation of the intriguing twist-bend nematic phase (NTB) and determine its properties. During our earlier hunt for the NTB phase created on cooling directly from the isotropic phase and not the nematic phase, we had prepared 30 symmetric liquid crystal dimers. These had odd spacers and methylene links to the two mesogenic groups; desirable but clearly not essential features for the formation of the NTB. Here, we report the phases that the dimers exhibit and their transition temperatures as functions of both the lengths of the spacer and the terminal chains. In addition we describe the transitional entropies, their optical textures, the X-ray scattering patterns and the 2H NMR spectra employed in characterising the phases. All of which may lead to important properties of the twist-bend nematic phase.

Original languageEnglish
Pages (from-to)106-126
Number of pages21
JournalLiquid Crystals
Volume44
Issue number1
Early online date20 Mar 2017
DOIs
Publication statusPublished - 2017

Keywords

  • inhomogeneity and anisotropy
  • liquid crystal dimers
  • local-structure correlations
  • molecular curvature
  • N–I transition
  • orientational order
  • Twist-bend nematics

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