Chirality inversion in cholesteric phases of bent-shaped liquid crystal dimers with chiral dopants
Yuki Arakawa, Junji Watanabe
TL;DR
This paper shows that adding chiral dopants to bent-shaped liquid crystal dimers can cause helical pitch divergence and chirality inversion in cholesteric phases.
Contribution
The study reveals chirality inversion and helical pitch divergence in cholesteric phases of bent-shaped LC dimers with chiral dopants.
Findings
Chirality inversion was observed in cholesteric phases of bent-shaped LC dimers with chiral dopants at specific concentrations.
Helical pitch divergence and reforming with opposite chirality occurred near phase transition temperatures.
The effect was specific to ester-linked dimers and not observed in other types of dimers.
Abstract
Incorporating molecular chirality into liquid crystals (LCs) yields nanoscale one-handed helical structures. The helical pitch of a cholesteric (Ch) phase (i.e., a chiral nematic phase) is typically slightly temperature-dependent, and the sense of helical rotation (i.e., chirality) rarely inverts. This study reports helical pitch divergence and chirality inversion in the Ch phase of bent-shaped LC dimers added with a chiral dopant (CD). We prepared four chiral LC mixtures containing equal proportions of two ester-linked 4-(trans-4-pentylcyclohexyl)phenyl-based bent-shaped LC dimers with odd-numbered spacers, each doped with 0.25, 0.50, 1.0, or 2.0 wt% of an isosorbide-based CD, ISO-(6OBA)2. All mixtures exhibited enantiotropic chiral twist-bend nematic and Ch phases near room temperature. Polarized optical microscopy revealed that in the Ch phases of the dimer mixtures with 0.25, 0.50,…
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Taxonomy
TopicsLiquid Crystal Research Advancements · Synthesis and Properties of Aromatic Compounds · Molecular spectroscopy and chirality