Journal ArticleDOI
A thermotropic biaxial nematic liquid crystal
TLDR
In this paper, optical studies have been carried out on a nematogenic copper complex, which incorporates the features of both rod-like and disk-like molecules, and conoscopic figures have been presented demonstrating the occurrence of a biaxial nematic phase in the pure complex, the uniaXial-biaxial (Na-Nb) transition in binary mixtures, and the temperature variation of the biaaxiality near this transition.Abstract:
Optical studies have been carried out on a nematogenic copper complex, which incorporates the features of both rod-like and disk-like molecules. Conoscopic figures are presented demonstrating (i) the occurrence of a biaxial nematic phase in the pure complex, (ii) the uniaxial-biaxial (Na-Nb) transition in binary mixtures, and (iii) the temperature variation of the biaxiality near this transition. The I-Na-Nb phase diagram has been studied for the binary system.read more
Citations
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Journal ArticleDOI
Magneto-optical technique for detecting the biaxial nematic phase
TL;DR: This work has developed a technique that uses a magnetic field to align the uniaxial director, thus widening its application to any bent-core nematic material.
Journal ArticleDOI
Molecular ordering in a biaxial smectic-A phase studied by scanning transmission X-ray microscopy (STXM)
TL;DR: Results of STXM investigations of a binary mixture known to form a SmA(b) phase show that the molecular plane of these aggregates is very sensitive to the relative orientation of electric field vector E of linearly polarized light, which is used to determine the molecular orientation in the LC phase.
Journal ArticleDOI
Utilization of the Perfluoroarene-Arene Interaction for Stabilization of Liquid Crystal Phases
TL;DR: In this article, the perfluoroarene-arene interaction for stabilization of liquid crystal phases is reviewed and it is strongly suggested that flatness of the mesogenic units is important for obtaining stable liquid-crystal phases.
Journal ArticleDOI
Refractive index measurements of the palladium complexed liquid crystal A'PdA2.
TL;DR: In this paper, a comparative study of the birefringence of a thermotropic metallorganic complex and of its free ligand is reported for the first time, using the method of the total reflection the ordinary and the extraordinary refractive indices of the palladium complexed liquid crystal A'PdA2 and its free l ligand 4-4′-Bis(hexyloxy)-azoxybenzene have been measured as function of temperature.
Journal ArticleDOI
Synthesis and characterisation of novel rod–disc oligomers
TL;DR: In this paper, the synthesis of rufigallol-based liquid crystalline oligomers, containing six rod-like cyanobiphenyl moieties connected to the rufigenol core via flexible alkyl spacers, was reported.
References
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The topological theory of defects in ordered media
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Observation of a Biaxial Nematic Phase in Potassium Laurate-1-Decanol-Water Mixtures
TL;DR: In this article, the ternary system potassium laurate-1-decanol-D${2}\mathrm{O}$ was studied over concentration ranges where nematic phases are likely to occur.
Journal ArticleDOI
Ordered phases of a liquid of biaxial particles
TL;DR: In this article, a simple model for an interacting liquid of particles lacking an axis of rotational symmetry is proposed, and the four order parameters necessary to describe an ordered phase are identified.
Journal ArticleDOI
Phase Transitions in a Fluid of Biaxial Particles
TL;DR: In this paper, a model for a fluid of biaxial particles within a type of mean-field approximation was solved. And the results suggest that the phase diagram of such a fluid exhibits a special critical point where two second-order critical lines meet a first-order phase boundary in a sharp cusp.