Journal ArticleDOI
Smectic mesophase properties of dimeric compounds. 2. Distinct formation of smectic structures with antiferroelectric ordering and frustration
TLDR
In this paper, a series of dimeric compounds, which comprise the schiff's base mesogen, alkyl spacer with the carbon number of 5 and alkyyl or alkoxy tail with the Carbon number of m = 4∼16, were found to be antiferroelectric.Abstract:
We have prepared two series of dimeric compounds, which comprise the schiff's base mesogen, alkyl spacer with the carbon number of 5 and alkyl or alkoxy tail with the carbon number of m = 4∼16. In these compounds, we observed three types of smectic liquid crystals, the single layer phase with the tail group randomly mixing with the spacer, the bilayer phase in which the segregation of the spacer and tail groups takes place and so two mesogenic layers are included within a repeat unit, the frustrated smectic phase in which the density modulation appears along the layer as well as the layer normal. The bilayer phase was found to be antiferroelectric and the frustrated smectic phase was considered to result from the two dimensional escape from the dipolar interaction. The phase behaviour with m and the structure and properties of each phase will be described in detail.read more
Citations
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Liquid crystal dimers and higher oligomers: between monomers and polymers
TL;DR: The underlying theme of this Critical Review is the relationship between molecular structure and liquid crystalline behaviour in a class of materials referred to as liquid crystal oligomers, and how this molecular architecture has been exploited to address issues in a range of quite different areas and has given rise to potential applications for these materials.
Journal ArticleDOI
Liquid crystal dimers and oligomers
TL;DR: In this article, the most recent developments in the understanding of structure-property relationships in liquid crystal dimers and higher oligomers are discussed, including trimers and tetramers.
Journal ArticleDOI
Intercalated liquid-crystalline phases formed by symmetric dimers with an α,ω-diiminoalkylene spacer
TL;DR: In this article, a series of symmetric, dimeric molecules with flexible α,ω-diiminoalkylene spacers have been synthesized and characterised by polarising optical microscopy, differential scanning calorimetry, and X-ray diffraction.
Journal ArticleDOI
Non‐symmetric liquid crystal dimers: how to make molecules intercalate
TL;DR: In this article, non-symmetric dimeric liquid crystals have been studied in the context of engineering and physical sciences at the University of Aberdeen in the UK, where the paper is based on the work of Rigeme et al.
Journal ArticleDOI
Low-birefringent, chiral banana phase below calamitic nematic and/or smectic C phases in oxadiazole derivatives.
Sungmin Kang,Yuki Saito,Nobuhiro Watanabe,Masatoshi Tokita,Yoichi Takanishi,Hideo Takezoe,Junji Watanabe +6 more
TL;DR: From detailed analyses of the optical texture and X-ray patterns through the transformation from well-oriented calamitic phases, the Bx phase was found to exhibit a helical structure, which arises as a frustration from the ground-state B2 phase in such a manner that the blocks of B2 layers are twisted with respect to each other in a direction parallel to the layer plane similarly to the twisted grain boundary (TGB) phase.
References
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Distinct ferroelectric smectic liquid crystals consisting of banana shaped achiral molecules
TL;DR: In this article, the synthesis of a banana-shaped molecule is reported and it is found that the smectic phase which it forms is biaxial with the molecules packed in the best direction into a layer.
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Non-symmetric dimeric liquid crystals The preparation and properties of the α-(4-cyanobiphenyl-4′-yloxy)-ω-(4-n-alkylanilinebenzylidene-4′-oxy)alkanes
George S. Attard,R. W. Date,Corrie T. Imrie,Geoffrey R. Luckhurst,S. J. Roskilly,John M. Seddon,L. Taylor +6 more
TL;DR: In this article, the α-(4-cyanobiphenyl-4-yloxy)-ω-(4n-alkylanilinebenzylidene-4′-oxy)alkanes have been prepared and phase behaviour and transitional properties of these series have been investigated using optical microscopy and differential scanning calorimetry.
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Smectogenic dimeric liquid crystals. The preparation and properties of the α,ω-bis(4-n-alkylanilinebenzylidine-4′-oxy)alkanes
TL;DR: In this article, the α,ω-bis (4n-alkylanilinebenzylidine-4′-oxy)alkanes have been synthesized and their transitional properties characterized.
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Smectic liquid crystals in main-chain polymers
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Thermotropic liquid crystals of polyesters having a mesogenic 4,4-bibenzoate unit Smectic mesophase properties and structures in dimeric model compounds
TL;DR: In this paper, a series of dimeric compounds, called di-BB-n, have been investigated and the most interesting effect among them was observed for a type of smectic phase.