Correlation of the molecular structure of discotic nematic liquid crystals with their orientational order and specific features of the nematic-isotropic phase transition

2004 ◽  
Vol 46 (8) ◽  
pp. 1554-1559 ◽  
Author(s):  
E. M. Aver’yanov
Keyword(s):  
Molecular Structure ◽  
Phase Transition ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Orientational Order ◽  
Isotropic Phase ◽  
Discotic Nematic Liquid Crystals

Laser Beam Induces Reorientation in Nematic Liquid Crystals

2010 ◽  
Vol 428-429 ◽  
pp. 224-227
Author(s):  
I Min Jiang ◽  
Yu Jen Chen ◽  
Wen Chi Hung ◽  
C.T. Kuo ◽  
D.J. Jang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Laser Beam ◽  
Nematic Liquid Crystals ◽  
Beam Propagation ◽  
Isotropic Phase ◽  
Optical Alignment ◽  
Optically Induced

Nematic liquid crystals (NLCs) can be easily reoriented by the laser beam at the temperature closed to the nematic–isotropic phase transition (TNI). At the temperature closed to TNI, the propagating mode of laser beam and the optically induced phase transition were explored by using a microscopic conoscope technique. This investigation demonstrates the formation of soliton at particular beam propagation modes. The interaction between nematic liquid crystals and the laser beam with different polarizations showed the nonlinearity in optical alignment.

Dielectric Constants and Molecular Structure of Nematic Liquid Crystals

1974 ◽  
Vol 29 (6) ◽  
pp. 905-911 ◽  
Author(s):  
W. H. de Jeu ◽  
Th. W. Lathouwers
Keyword(s):  
Molecular Structure ◽  
Liquid Crystals ◽  
Dielectric Properties ◽  
Nematic Liquid Crystals ◽  
Dielectric Constants ◽  
Isotropic Phase

Measurements are presented of the dielectric constants of some p,p′-n-alyl and n-alkoxy substituted azobenzenes and azoxybenzenes in the nematic and in the isotropic phase. Starting from the dipole-less, p,p′,di-n-alkyl-azobenzenes, a systematic interpretation is given of the influence of the molecular structure on the dielectric properties.

scholarly journals Emergence and stabilization of transient twisted defect structures in confined achiral liquid crystals at a phase transition.

Soft Matter ◽  
2021 ◽  
Author(s):  
Jose X Velez ◽  
Zhaofei Zheng ◽  
Daniel A. Beller ◽  
Francesca Serra
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Soft Matter ◽  
Capillary Tube ◽  
Nematic Liquid Crystals ◽  
Defect Structures

Spontaneous emergence of chirality is a pervasive theme in soft matter. We report a transient twist forming in achiral nematic liquid crystals confined to a capillary tube with square cross...

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