Mesophase structure and behaviour in bulk and restricted geometry of a dimeric compound exhibiting a nematic-nematic transition

Sebastián, Nerea; Tamba, Maria-Gabriela; Stannarius, Ralf; Fuente, María Rosario de la ; Salamończyk, Mirosław; Cukrov, Greta; Gleeson, Jim T.; Sprunt, Samuel N.; Jákli, A. (Antal); Welch, Chris J.; Ahmed, Ziauddin (Chemist); Mehl, Georg H.; Eremin, Alexey B., 1976-

Mesogenic shape; Nematic-nematic transitions
2016

Journal article


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This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Abstract

We present structural studies of a dimeric compound composed of a central heptyl spacer linking two mesogens consisiting of terphenyl units at which two adjacent fluoro groups are attached to each central ring. The terminal rings are linked to pentyl chains as terminal groups. The material exhibits a nematic-nematic transition and a low temperature modulated phase. The higher temperature nematic phase was found to exhibit an anomaly of the bend elastic constant similar to that of the dimers with N-Ntb phase sequence, and the physical properties of the low-temperature nematic phase are similar to those of the known Ntb materials. The structure of the low-temperature modulated smectic/columnar phase is described together with its ability to form freely suspended films and fibres. The relation of the modulated structure to the fibre formation and to the appearance of the labyrinthine instability in freely-suspended films is discussed.

Publisher
The University of Hull
Peer reviewed
Yes
Language
English
Extent
5 MB
Identifier
hull:13481

Journal

Journal title
Physical chemistry chemical physics
Publication date
2016
Publisher
Royal Society of Chemistry
DOI
10.1039/c6cp03899a
ISSN (Print)
1463-9076
ISSN (Electronic)
1463-9084
Volume
18
Start page
19299
End page
19308
Notes

This is a copy of an open access article published in Physical Chemistry Chemical Physics, 2016.

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