Twist-bend nematic phase in the presence of molecular chirality

Longa, Lech; Tomczyk, Wojciech

doi:10.1080/02678292.2018.1499148

Cited by 23 publications

(24 citation statements)

References 35 publications

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“…Another theoretical model including the effects of molecular chirality was described by Longa and Tomczyk, who used minimum coupling Landau-de Gennes theory to reveal the possibility of a polar, chiral N TB phase. 14 At present, only a handful of systems exhibiting the transition between chiral nematic and twistbend nematic phases have been observed experimentally. These have included mixtures of twist-bend nematogens with a chiral dopant 15,16 as well as intrinsically chiral materials, with a Department of Chemistry, School of Natural and Computing Sciences, University the latter being particularly rare.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular liquid crystals exhibiting a chiral twist-bend nematic phase

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Supramolecular liquid crystals exhibiting a chiral twist-bend nematic phase

et al. 2020

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“…[8] Longa and To mczyk studied the effects of molecular chirality on the N TB phase by using minimumc oupling Landau-de Gennes theory revealing the possibility of ap olar,chiral twist-bend nematic phase. [9] There are two approaches to introduce molecular chirality into the N TB phase, either by the addition of ac hiral dopant or by the preparation of ac hiral nematogen. The addition of a chiral dopant weakly destabilises the N TB relative to the N phase and the removal of the degeneracy of the two heliconical states is observed.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, chiral doping is predicted to increase the stability of the N TB phase . Longa and Tomczyk studied the effects of molecular chirality on the N TB phase by using minimum coupling Landau‐de Gennes theory revealing the possibility of a polar, chiral twist‐bend nematic phase …”

Section: Introductionmentioning

confidence: 99%

The Chiral Twist‐Bend Nematic Phase (N*_TB)

Walker

Pociecha

Storey

et al. 2019

Chemistry A European J

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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 NnormalTnormalB* 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.

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“…Chiral doping is therefore predicted to increase the stability of the N TB phase. Longa and Tomczyk used minimum coupling Landau-de Gennes theory to reveal the possibility of a polar, chiral N TB phase [49]. Only a handful of chiral nematic-twist-bend nematic transitions have been observed experimentally.…”

Section: Chirality and The N Tb Phasementioning

confidence: 99%

The twist-bend phases: structure–property relationships, chirality and hydrogen-bonding

Walker

2020

Liquid Crystals Today

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This article will review some of our recent work concerning the relationships between molecular structure and the observation of the fascinating twist-bend nematic, N TB , phase. From a chemist's perspective, understanding the molecular features influencing the formation and stabilisation of the N TB phase is of paramount importance, and allows for the design of new materials that have targeted properties. As such, recent work in Aberdeen has had the primary aim of enhancing our current understanding of these relationships in dimeric liquid crystals, through the synthesis and characterisation of a diverse range of materials, including a selection of supramolecular liquid crystals. A second aim has been to explore the intriguing question as to how the N TB phase, having spontaneous structural chirality, would respond at a microscopic level to the presence of intrinsic molecular chirality -the inclusion of chiral fragments in the dimers -and to obtain examples of the 'chiral' twist-bend nematic phase (N* TB ) for comparative study alongside the conventional N TB phase. We also show that bent achiral molecules form heliconical smectic phases, as predicted by Dozov in his seminal 2001 work.

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Twist-bend nematic phase in the presence of molecular chirality

Cited by 23 publications

References 35 publications

Supramolecular liquid crystals exhibiting a chiral twist-bend nematic phase

Supramolecular liquid crystals exhibiting a chiral twist-bend nematic phase

The Chiral Twist‐Bend Nematic Phase (N*_TB)

The twist-bend phases: structure–property relationships, chirality and hydrogen-bonding

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Twist-bend nematic phase in the presence of molecular chirality

Cited by 23 publications

References 35 publications

Supramolecular liquid crystals exhibiting a chiral twist-bend nematic phase

Supramolecular liquid crystals exhibiting a chiral twist-bend nematic phase

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

The twist-bend phases: structure–property relationships, chirality and hydrogen-bonding

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The Chiral Twist‐Bend Nematic Phase (N*_TB)