A new flexoelectric mode in twist-bend nematic liquid crystals
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Molecular Liquids"
DOI: 10.1016/j.molliq.2019.111707
Abstract: Abstract Mesogenic dimers in the twist-bend nematic phase exhibit much higher flexoelectric polarization than in their uniform nematic phase. In order to theoretically investigate this data, we extend the symmetry based linear elastic theory of… read more here.
Keywords: new flexoelectric; bend nematic; twist bend; nematic phase ... See more keywords
Liquid crystal dimers and the twist-bend nematic phase: On the role of spacers and terminal alkyl chains
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Molecular Liquids"
DOI: 10.1016/j.molliq.2020.114391
Abstract: Abstract The synthesis and characterisation of four series of liquid crystal dimers based on benzylideneaniline mesogenic units, and in which the lengths of terminal alkyloxy chains are varied are reported. The series differ in terms… read more here.
Keywords: twist bend; nematic phase; liquid crystal; bend nematic ... See more keywords
Thioether-linked liquid crystal dimers and trimers: The twist-bend nematic phase
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Molecular Structure"
DOI: 10.1016/j.molstruc.2019.126913
Abstract: Abstract Systematic synthesis of thioether-linked dimers and trimers was carried out to reveal molecular designs for inducing mesophases and twist-bend nematic (NTB) phases. A five-fold approach based on molecular structural parameters including the terminal substituent,… read more here.
Keywords: thioether; twist bend; dimers trimers; bend nematic ... See more keywords
Instabilities in the electric Freedericksz state of the twist-bend nematic liquid crystal CB7CB.
Sign Up to like & getrecommendations! Published in 2018 at "Soft matter"
DOI: 10.1039/c8sm00554k
Abstract: We report on the instabilities in the Freedericksz state of the twist-bend nematic (NTB) liquid crystal 1'',7''-bis(4-cyanobiphenyl-4'-yl)heptane (CB7CB). The quasi homeotropic NTB state, into which a planar (untwisted or 90°-twisted) nematic CB7CB layer transits under… read more here.
Keywords: state; bend nematic; freedericksz state; twist bend ... See more keywords
Controlling spontaneous chirality in achiral materials: liquid crystal oligomers and the heliconical twist-bend nematic phase.
Sign Up to like & getrecommendations! Published in 2022 at "Chemical communications"
DOI: 10.1039/d1cc07012f
Abstract: Liquid crystal oligomers, namely dimers, trimers and tetramers, consisting of cyanobiphenyl and benzylideneaniline-based mesogenic units connected by either linear or bent alkoxy or alkyl spacers are reported. These materials, although built from achiral molecules, show… read more here.
Keywords: liquid crystal; bend nematic; twist bend; phase ... See more keywords
Formation of periodic zigzag patterns in the twist-bend nematic liquid crystal phase by surface treatment
Sign Up to like & getrecommendations! Published in 2017 at "Liquid Crystals"
DOI: 10.1080/02678292.2016.1274283
Abstract: ABSTRACT Zigzag patterns were successfully generated in the twist-bend nematic (NTB) phase of 1-(4-cyanobiphenyl-4′-yl)-6-(4-cyanobiphenyl-4′-yloxy)hexane (CB6OCB) via simple surface treatment. A detailed microscopy study using polarised optical microscopy and fluorescence confocal polarising microscopy was performed to… read more here.
Keywords: phase; bend nematic; microscopy; twist bend ... See more keywords
Twist-bend nematic phases in binary mixtures of banana-shaped liquid crystalline molecules
Sign Up to like & getrecommendations! Published in 2018 at "Liquid Crystals"
DOI: 10.1080/02678292.2017.1395483
Abstract: ABSTRACT We present a mean field theory to describe twist-bend nematic () phases in binary mixtures of banana shaped, such as bent-core or dimer, liquid crystalline (LC) molecules with , where is a twist and… read more here.
Keywords: binary mixtures; bend nematic; phases binary; twist bend ... See more keywords
Behaviour of twist-bend nematic structure under a uniform magnetic field
Sign Up to like & getrecommendations! Published in 2017 at "Molecular Crystals and Liquid Crystals"
DOI: 10.1080/15421406.2017.1303598
Abstract: ABSTRACT From the elastic point of view, the twist-bend nematic phase, (NTB), has a ground state characterised by a spontaneous bend with a precession of the director n along the direction of an axis t.… read more here.
Keywords: bend nematic; field; twist bend; behaviour twist ... See more keywords
Structure and grating efficiency of thin cells filled by a twist-bend nematic liquid crystal.
Sign Up to like & getrecommendations! Published in 2020 at "Physical review. E"
DOI: 10.1103/physreve.102.032704
Abstract: A twist-bend nematic (N_{TB}) liquid crystalline phase spontaneously forms modulated structures on a microscale level when confined in thin planar cells. Preliminary studies showed that these cells can be used as polarization gratings. Here we… read more here.
Keywords: thin cells; twist bend; structure; nematic liquid ... See more keywords
In situ measurements of twist and bend elastic constants in the oblique helicoidal cholesteric.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review. E"
DOI: 10.1103/physreve.106.024702
Abstract: Unique electro-optical properties of the oblique helicoidal cholesteric (Ch_{OH}) stem from its heliconical director structure. An applied electric field preserves the single-harmonic modulation of the director while tuning the Ch_{OH} period and the corresponding Bragg-peak… read more here.
Keywords: measurements twist; situ measurements; helicoidal cholesteric; oblique helicoidal ... See more keywords
Twist-bend nematic drops as colloidal particles: Electric instabilities.
Sign Up to like & getrecommendations! Published in 2023 at "Physical review. E"
DOI: 10.1103/physreve.107.044703
Abstract: The mesogen 1,''7''-bis(4-cyanobiphenyl-4'-yl)heptane (CB7CB), doped with a small quantity of an amphiphilic compound, is examined in its biphasic state in which twist-bend nematic (N_{TB}) drops are dispersed in the isotropic fluid. Various flexoelectric and electrokinetic… read more here.
Keywords: frequency; nematic drops; bend nematic; geometry ... See more keywords