scholarly journals Density–orientation coupling for a microcontinuum approach to nematic liquid crystals subject to electric field

2021 ◽  
Author(s):  
Maurizio Romeo
Keyword(s):  
Liquid Crystals ◽  
Molecular Orientation ◽  
Mass Density ◽  
Nematic Liquid Crystals ◽  
Constitutive Models ◽  
Static Problem ◽  
Compressible Liquid ◽  
Micropolar Theory ◽  
Micropolar Model ◽  
Compressible Nematic Liquid Crystal

AbstractA microcontinuum description of compressible liquid crystals is examined accounting for a constitutive model based on mass microdensity. As a first point, we discuss the effectiveness of the micropolar theory on compressible continua, which is limited to static problems. Then, by a micromorphic representation of mass density, we show the consistence of some classical constitutive models for compressible nematic liquid crystals and remark their connection with the microinertia tensor. After the analysis of a constitutive micropolar model, we discuss a static problem for a layer of compressible nematic liquid crystal in a planar configuration. The effects of an applied electric potential are considered remarking the coupling of density distribution with the molecular orientation.

Molecular dynamics in weakly polar nematic liquid crystal doped with dye

2011 ◽  
Vol 89 (6) ◽  
pp. 661-665 ◽  
Author(s):  
Satya Prakash Yadav ◽  
Kamal Kumar Pandey ◽  
Abhishek Kumar Misra ◽  
Sudhaker Dixit ◽  
Rajiv Manohar
Keyword(s):  
Molecular Dynamics ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Intermolecular Interaction ◽  
Nematic Liquid Crystal ◽  
Molecular Orientation ◽  
Nematic Liquid Crystals ◽  
Dipole Interaction ◽  
Molecular Arrangement

Our intention in the present work is to find out the role of dye in the molecular orientation of the weakly polar nematic liquid crystal D6AOB. The doping of a dye introduces a disturbance in the molecular arrangement of the nematic liquid crystal molecules. However, this disturbance is found to be sensitive to the concentration of the dye dispersed in the nematic liquid crystal. It is found that orientation in the dyed nematic liquid crystal is less ordered than the orientation in the pure nematic liquid crystals. This behavior has been explained on the basis of intermolecular interaction, i.e., dipole–dipole interaction.

scholarly journals Properties of surface Landau–de Gennes Q-tensor models

Soft Matter ◽  
2020 ◽  
Vol 16 (16) ◽  
pp. 4032-4042 ◽  
Author(s):  
Michael Nestler ◽  
Ingo Nitschke ◽  
Hartmut Löwen ◽  
Axel Voigt
Keyword(s):  
Liquid Crystals ◽  
Molecular Orientation ◽  
Nematic Liquid Crystals ◽  
Degree Of Freedom ◽  
Curved Surface ◽  
Tensor Models

Uniaxial nematic liquid crystals whose molecular orientation is subjected to tangential anchoring on a curved surface offer a non trivial interplay between the geometry and the topology of the surface and the orientational degree of freedom.

Article

1998 ◽  
Vol 76 (2) ◽  
pp. 163-167
Author(s):  
T V Galstyan ◽  
V Drnoyan
Keyword(s):  
Liquid Crystals ◽  
Molecular Orientation ◽  
Nematic Liquid Crystals ◽  
Hysteresis Width ◽  
Circular Symmetry ◽  
Switching Threshold ◽  
Elliptical Symmetry

Light-induced molecular orientation switching and large intrinsichysteresis in a homeotropic cell of nematic liquid crystals areobtained. Both the switching threshold and the hysteresis width areeffectively controlled by the elliptical symmetry of a noncoherentoptical field. We confirmed the predicted doubling of the switchingthreshold in the case of the light with circular symmetry and vanishingangular momentum.PACS No. 78.47

Raman spectra and molecular orientation statistics for nematic liquid crystals

1982 ◽  
Vol 37 (2) ◽  
pp. 962-965
Author(s):  
S. E. Yakovenko ◽  
V. I. Naumenko ◽  
A. A. Min'ko ◽  
N. M. Ksenofontova
Keyword(s):  
Liquid Crystals ◽  
Raman Spectra ◽  
Molecular Orientation ◽  
Nematic Liquid Crystals ◽  
Orientation Statistics
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