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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Synthesis, mesomorphic, photophysical and computational studies of new achiral four-ring unsymmetrical bent-core mesogens and their Copper(II) complexes
TL;DR: In this paper, achiral four-ring unsymmetrical bent-core mesogens derived from 2,5-dihydroxybenzaldehyde and their copper(II) complexes were synthesized as a new design with an imine and ester linkage.
Journal ArticleDOI
Lattice cluster theory for phase behavior of rectangular mesogens. II. Nearest‐neighbor interactions, phase diagrams, and competitive nematic orderings
Wenshuo Li,Karl F. Freed +1 more
TL;DR: In this article, the lattice cluster theory is extended to study all the possible nematic orderings of rectangular mesogens, namely, rodlike, discotic, and biaxial nematics for oblong mesogens.
Journal ArticleDOI
2,3,4-Trihydroxy benzonitrile-based liquid crystals: Fiber forming room temperature nematic phases
TL;DR: In this article, the synthesis and investigation of a new type of liquid crystalline trimers was reported, which was designed and synthesized by connecting a 2,3,4-trihydroxy benzonitrile to three 4-cyanobiphenyl units via ether linkages with aliphatic spacers having a variable number of carbon atoms.
Journal ArticleDOI
Elastic Anisotropy and Anchoring Effects on the Textures of Nematic Films with Random Planar Surface Alignment
TL;DR: In this paper, a Monte Carlo study of topological defects in nematic films with random planar boundary conditions is presented, and the polarized microscopy images and their evolution are analyzed in uniaxial systems for different anchoring strengths and film thicknesses.
Journal ArticleDOI
Physics of non-Abelian vortices in Bose-Einstein condensates
TL;DR: In this paper, non-Abelian vortices and their dynamics in the cyclic phase of a spin-2 BEC were studied. And they showed the unique effect in their collision dynamics, i.e. they do not reconnect themselves nor pass through each other but create a rung vortex between them.
References
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Journal ArticleDOI
The topological theory of defects in ordered media
TL;DR: Aspects of the theory of homotopy groups are described in a mathematical style closer to that of condensed matter physics than that of topology in this paper, where the focus is on mathematical pedagogy rather than on a systematic review of applications.
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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.
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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.
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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.