Microscopy Studies of the Nematic NTB Phase of 1,11-Di-(1"-Cyanobiphenyl-4-yl)undecane

Richard J. Mandle; Edward J. Davis; Craig T. Archbold; Stephen J. Cowling; John W. Goodby

doi:10.1039/C3TC32137a

Microscopy Studies of the Nematic NTB Phase of 1,11-Di-(1"-Cyanobiphenyl-4-yl)undecane

Richard J. Mandle, Edward J. Davis, Craig T. Archbold, Stephen J. Cowling, John W. Goodby

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

A detailed microscopy study of the mesophases of 1,11-di-(100-cyanobiphenyl-4-yl)undecane (CB11CB) was undertaken, with an emphasis on attempting to relate the recent helical “twist-bend” model of the NTB phase to the observed optical textures. Our ability to draw a freestanding film indicates that the phase is unlikely to be nematic and possesses long range periodicity. No electrooptic response could be detected in the NTB phase, with or without addition of a chiral dopant although dielectric breakdown and space charge were observed at high voltage leading to field dependent pulsing of the sample. No optical rotation associated with a macroscopic helical structure could be discerned in the NTB phase. However, this observation could be taken to be in keeping with the extremely short pitch of a proposed “twist-bend” model.

Original language	English
Pages (from-to)	556-566
Number of pages	11
Journal	Journal of Materials Chemistry C
Volume	2
Issue number	3
Early online date	26 Nov 2013
DOIs	https://doi.org/10.1039/C3TC32137a
Publication status	Published - 21 Jan 2014

Access to Document

10.1039/C3TC32137a

Stephen James Cowling
- stephen.cowlingyork.acuk
- Chemistry - Research Fellow
Person: Research

Self-Organisation and Self-Assembly in Aliphatic Based Liquid Crystals
Goodby, J. W., Cowling, S. J. & Saez, I. M.
EPSRC
6/02/12 → 31/03/15
Project: Research project (funded) › Research

Cite this

@article{aaf884145208435ba271b26cf39ea8af,

title = "Microscopy Studies of the Nematic NTB Phase of 1,11-Di-(1{"}-Cyanobiphenyl-4-yl)undecane",

abstract = "A detailed microscopy study of the mesophases of 1,11-di-(100-cyanobiphenyl-4-yl)undecane (CB11CB) was undertaken, with an emphasis on attempting to relate the recent helical “twist-bend” model of the NTB phase to the observed optical textures. Our ability to draw a freestanding film indicates that the phase is unlikely to be nematic and possesses long range periodicity. No electrooptic response could be detected in the NTB phase, with or without addition of a chiral dopant although dielectric breakdown and space charge were observed at high voltage leading to field dependent pulsing of the sample. No optical rotation associated with a macroscopic helical structure could be discerned in the NTB phase. However, this observation could be taken to be in keeping with the extremely short pitch of a proposed “twist-bend” model.",

author = "Mandle, {Richard J.} and Davis, {Edward J.} and Archbold, {Craig T.} and Cowling, {Stephen J.} and Goodby, {John W.}",

year = "2014",

month = jan,

day = "21",

doi = "10.1039/C3TC32137a",

language = "English",

volume = "2",

pages = "556--566",

journal = "Journal of Materials Chemistry C",

issn = "2050-7526",

publisher = "The Royal Society of Chemistry",

number = "3",

}

TY - JOUR

T1 - Microscopy Studies of the Nematic NTB Phase of 1,11-Di-(1"-Cyanobiphenyl-4-yl)undecane

AU - Mandle, Richard J.

AU - Davis, Edward J.

AU - Archbold, Craig T.

AU - Cowling, Stephen J.

AU - Goodby, John W.

PY - 2014/1/21

Y1 - 2014/1/21

N2 - A detailed microscopy study of the mesophases of 1,11-di-(100-cyanobiphenyl-4-yl)undecane (CB11CB) was undertaken, with an emphasis on attempting to relate the recent helical “twist-bend” model of the NTB phase to the observed optical textures. Our ability to draw a freestanding film indicates that the phase is unlikely to be nematic and possesses long range periodicity. No electrooptic response could be detected in the NTB phase, with or without addition of a chiral dopant although dielectric breakdown and space charge were observed at high voltage leading to field dependent pulsing of the sample. No optical rotation associated with a macroscopic helical structure could be discerned in the NTB phase. However, this observation could be taken to be in keeping with the extremely short pitch of a proposed “twist-bend” model.

AB - A detailed microscopy study of the mesophases of 1,11-di-(100-cyanobiphenyl-4-yl)undecane (CB11CB) was undertaken, with an emphasis on attempting to relate the recent helical “twist-bend” model of the NTB phase to the observed optical textures. Our ability to draw a freestanding film indicates that the phase is unlikely to be nematic and possesses long range periodicity. No electrooptic response could be detected in the NTB phase, with or without addition of a chiral dopant although dielectric breakdown and space charge were observed at high voltage leading to field dependent pulsing of the sample. No optical rotation associated with a macroscopic helical structure could be discerned in the NTB phase. However, this observation could be taken to be in keeping with the extremely short pitch of a proposed “twist-bend” model.

U2 - 10.1039/C3TC32137a

DO - 10.1039/C3TC32137a

M3 - Article

VL - 2

SP - 556

EP - 566

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

SN - 2050-7526

IS - 3

ER -

Microscopy Studies of the Nematic NTB Phase of 1,11-Di-(1"-Cyanobiphenyl-4-yl)undecane

Abstract

Access to Document

Profiles

Stephen James Cowling

Projects

Self-Organisation and Self-Assembly in Aliphatic Based Liquid Crystals

Cite this