Chiral conglomerates observed for a binary mixture of a nematic liquid crystal trimer and 6OCB

Yoshizawa, Atsushi; Kato, Yusuke; Sasaki, Haruna; Takanishi, Yoichi; Yamamoto, Jun

doi:10.1039/c5sm02121a

Cited by 12 publications

(17 citation statements)

References 51 publications

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“…Recently, the DC phase was reported to exist in a binary mixture of a NLC trimer and a rod‐shaped NLC . The emergence of the DC phase was confirmed only by mixing a cyanobiphenyl molecule (6OCB) but not by other two rod‐shaped molecules used.…”

Section: Hierarchical Chiral Superstructuresmentioning

confidence: 99%

Chiral Superstructure Mesophases of Achiral Bent‐Shaped Molecules – Hierarchical Chirality Amplification and Physical Properties

Takezoe

Araoka

2016

Advanced Materials

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Chiral mesophases in achiral bent-shaped molecules have attracted particular attention since their discovery in the middle 1990s, not only because of their homochirality and polarity, but also due to their unique physical/physicochemical properties. Here, the most intriguing results in the studies of such symmetry-broken states, mainly helical-nanofilament (HNF) and dark-conglomerate (DC) phases, are reviewed. Firstly, basic information on the typical appearance and optical activity in these phases is introduced. In the following section, the formation of mesoscopic chiral superstructures in the HNF and DC phases is discussed in terms of hierarchical chirality. Nanoscale phase segregation in mixture systems and gelation ability in the HNF phase are also described. In addition, some other related chiral phases of bent-shaped molecules are shown. Recent attempts to control such mesoscopic chiral structure and the alignment/confinement of HNFs are also discussed, along with several examples of their fascinating advanced physical properties, i.e. huge enhancement of circular dichroism, electro- and photo-tunable optical activities, chirality-induced nonlinear optics (second-harmonic-generation circular difference and electrogyration effect), enhanced hydrophobicity through the dual-scale surface morphological modulation, and photoconductivity in the HNF/fullerene binary system. Future prospects from basic science and application viewpoints are also indicated in the concluding section.

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Section: Hierarchical Chiral Superstructuresmentioning

confidence: 99%

Chiral Superstructure Mesophases of Achiral Bent‐Shaped Molecules – Hierarchical Chirality Amplification and Physical Properties

Takezoe

Araoka

2016

Advanced Materials

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“…Questions and reports concerning spontaneous breaking of mirror symmetry are of fundamental importance to a wide range of scientific disciplines, [20][21][22][23][24][25][26][27][28][29] and so the formation of helical, chiral, nanoscale structures in liquid-crystalline bent-core compounds, [30][31][32] dimers [33][34][35][36] and trimers 27,[37][38][39] has prompted extensive study. When formed from a racemates or molecules lacking stereogenic centre it is the chirality that results from conformers that leads to the spontaneous breaking of mirror symmetry in the N TB phase.…”

Section: Introductionmentioning

confidence: 99%

The dependency of twist-bend nematic liquid crystals on molecular structure: a progression from dimers to trimers, oligomers and polymers

Mandle

2016

Soft Matter

115

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This article gives an overview on recent developments concerning the twist-bend nematic phase. The twist-bend nematic phase has been discussed as the missing link between the uniaxial nematic mesophase (N) and the helical chiral nematic phase (N*). After an introduction discussing the key physical properties of the N phase and the methods used to identify the twist-bend nematic mesophase this review focuses on structure property relationships and molecular features that govern the incidence of this phase.

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“…In recent years the new inhomogeneous nematic phases have been observed [1][2][3][4][5][6][7][8][9][10][11][12][13], and the study of the detailed structure of these phases is currently the most topical issue in liquid crystals research. The experiments for oligomers and bent-core systems indicate that there are at least two types of modulated nematic structures with one-dimensional periodicity.…”

Section: Introductionmentioning

confidence: 99%

Polar interactions between bent–core molecules as a stabilising factor for inhomogeneous nematic phases with spontaneous bend deformations

Osipov

Paja̧k

2016

Liquid Crystals

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This version is available at https://strathprints.strath.ac.uk/59161/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. It is generally accepted that the transition into the twist-bend nematic phase (NTB) is driven by an elastic instability related to the reduction of the bend elastic constant. Here we use a molecular-statistical theory to show that sufficiently strong polar interactions between bent-shaped molecules may lead to experimentally observed reduction of the bend elastic constant in the nematic phase even if electrostatic dipole-dipole interactions are not taken into account. We propose a simple model of bent-core particles and derive explicit analytical expressions which enable one to understand how polar molecular shape affects the elastic constants, and, in particular, the important role of the bend angle. Numerical graphs showing temperature variations of all elastic constants are also presented including the variation of the bend and splay elastic constants before and after the renormalization determined by local polar order of molecular steric dipoles and the corresponding polar correction to the one-particle distribution function.

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Chiral conglomerates observed for a binary mixture of a nematic liquid crystal trimer and 6OCB

Cited by 12 publications

References 51 publications

Chiral Superstructure Mesophases of Achiral Bent‐Shaped Molecules – Hierarchical Chirality Amplification and Physical Properties

Chiral Superstructure Mesophases of Achiral Bent‐Shaped Molecules – Hierarchical Chirality Amplification and Physical Properties

The dependency of twist-bend nematic liquid crystals on molecular structure: a progression from dimers to trimers, oligomers and polymers

Polar interactions between bent–core molecules as a stabilising factor for inhomogeneous nematic phases with spontaneous bend deformations

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