Journal ArticleDOI
The biaxial smectic (SmAb) phase in nonsymmetric liquid crystal dimers comprising two rodlike anisometric segments: an unusual behavior
Channabasaveshwar V. Yelamaggad,Indudhara Swamy Shashikala,Doddamane S. Shankar Rao,Geetha G. Nair,Subbarao Krishna Prasad +4 more
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TLDR
The first nonsymmetric liquid crystal dimers, possessing salicylaldimine and cyanobiphenyl rodlike anisometric segments, exhibiting the biaxial smectic A (McMillan) phase unequivocally evidenced by microscopic, conoscopic, calorimetric and X-ray diffraction studies is reported in this article.Abstract:
The first nonsymmetric liquid crystal dimers, possessing salicylaldimine and cyanobiphenyl rodlike anisometric segments, exhibiting the biaxial smectic A (McMillan) phase unequivocally evidenced by microscopic, conoscopic, calorimetric and X-ray diffraction studies is reported.read more
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Unconventional liquid crystal oligomers with a hierarchical structure
TL;DR: In this paper, the concepts of molecular dynamics, electrostatic core-core interactions, hydrocarbon-fluorocarbon amphiphilicity and intramolecular chirality transfer are applied to the creation of new materials.
Journal ArticleDOI
Symmetrical dimer liquid crystals derived from benzoxazoles
TL;DR: A series of dimeric twin liquid crystals derived from symmetric heterocyclic benzoxazoles 1a-1f exhibiting single smectic C phase are reported in this article.
Journal ArticleDOI
Liquid Crystal Trimers Composed of Banana-Shaped and Rodlike Anisometric Segments : Synthesis and Characterization
TL;DR: In this article, mesomorphic linear trimers consisting of bent-core and rod-like anisotropic segments are reported. But the mesomorphic trimers are not shown to have a metastable phase.
Journal ArticleDOI
Polar switching in the smectic- A d P A phase composed of asymmetric bent-core molecules
Lingfeng Guo,Surajit Dhara,B. K. Sadashiva,S. Radhika,R. Pratibha,Yoshio Shimbo,Fumito Araoka,Ken Ishikawa,Hideo Takezoe +8 more
TL;DR: The dielectric studies suggest that a field-induced antiferroelectric-ferroelectric phase transition occurs continuously beyond 1.2 V/microm and is reversible.
Journal ArticleDOI
Optically biaxial interdigitated smectic A phase : liquid crystalline dimeric bidentate ligands and their metal complexes
Channabasaveshwar V. Yelamaggad,Indudhara Swamy Shashikala,V. Padmini Tamilenthi,D. S. Shankar Rao,Geetha G. Nair,Subbarao Krishna Prasad +5 more
TL;DR: In this article, a detailed study into the synthesis and characterization of achiral nonsymmetric dimeric bidentate ligands formed by combining salicylaldimine and cyanobiphenyl rodlike anisometric segments through a flexible spacer (varying in its length and parity) and their Cu(II and Pd(II) complexes is reported.
References
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Journal ArticleDOI
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.
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.
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Experimental evidence for an achiral orthogonal biaxial smectic phase without in-plane order exhibiting antiferroelectric switching behavior.
Alexey Eremin,Siegmar Diele,Gerhard Pelzl,Hajnalka Nádasi,Wolfgang Weissflog,J. Salfetnikova,Horst Kresse +6 more
TL;DR: An achiral orthogonal biaxial smectic-A phase which exhibits antiferroelectric switching behavior is reported which is based on x-ray-diffraction measurements, texture observation, and the results of dielectric and electro-optical measurements.
Journal ArticleDOI
Symmetry and defects in the CM phase of polymeric liquid crystals
TL;DR: In this paper, the authors discuss defects allowed by the symmetry of a biaxial and orthogonal smectic polymeric liquid crystal with in-plane fluid order (smectic C M ).