Stokes polarimetry for the characterization of bio-materials using liquid crystal variable retarders

2007 ◽  
Author(s):  
Shamaraz Firdous ◽  
Masroor Ikram
Keyword(s):  
Liquid Crystal ◽  
Stokes Polarimetry

Unitary matrix approach for a precise voltage dependent characterization of reflective liquid crystal devices by average Stokes polarimetry

2020 ◽  
Vol 45 (20) ◽  
pp. 5732
Author(s):  
Andrés Márquez ◽  
Francisco J. Martínez-Guardiola ◽  
Jorge Francés ◽  
Eva M. Calzado ◽  
Daniel Puerto ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Unitary Matrix ◽  
Matrix Approach ◽  
Liquid Crystal Devices ◽  
Voltage Dependent ◽  
Stokes Polarimetry

scholarly journals Azimuthal Anchoring Strength in Photopatterned Alignment of a Nematic

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 675
Author(s):  
H. Nilanthi Padmini ◽  
Mojtaba Rajabi ◽  
Sergij V. Shiyanovskii ◽  
Oleg D. Lavrentovich
Keyword(s):  
Liquid Crystal ◽  
Point Defects ◽  
Elastic Energy ◽  
Separation Distance ◽  
Thin Layers ◽  
Uv Exposure ◽  
Surface Anchoring ◽  
Anchoring Strength ◽  
Spatially Varying

Spatially-varying director fields have become an important part of research and development in liquid crystals. Characterization of the anchoring strength associated with a spatially-varying director is difficult, since the methods developed for a uniform alignment are seldom applicable. Here we characterize the strength of azimuthal surface anchoring produced by the photoalignment technique based on plasmonic metamsaks. The measurements used photopatterned arrays of topological point defects of strength +1 and −1 in thin layers of a nematic liquid crystal. The integer-strength defects split into pairs of half-integer defects with lower elastic energy. The separation distance between the split pair is limited by the azimuthal surface anchoring, which allows one to determine the strength of the latter. The strength of the azimuthal anchoring is proportional to the UV exposure time during the photoalignment of the azobenzene layer.

Characterization of some mesogenic alkyl 1-thioglycosides

2002 ◽  
Vol 80 (8) ◽  
pp. 1162-1165 ◽  
Author(s):  
B Henrissat ◽  
G K Hamer ◽  
M G Taylor ◽  
R H Marchessault
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Solid State ◽  
Solid State Nmr ◽  
Liquid Crystalline ◽  
Liquid Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Liquid Crystalline Phases

A series of dodecyl 1-thio-β-D-glycosides has been synthesized and characterized (DSC, NMR, CP MAS, X-ray diffraction) as possible new marking materials with liquid-crystalline properties. These compounds undergo solid to liquid crystal phase transitions at various temperatures, which depend on the nature of the carbohydrate part of the structure. Their liquid-crystalline phases show extreme shear thinning behaviour.Key words: liquid crystal, powder X-ray diffraction, phase transition, thioglycoside, solid-state NMR, marking material

Synthesis and characterization of two isomeric liquid crystal series with reactive double bonds

1993 ◽  
Vol 15 (5) ◽  
pp. 689-700 ◽  
Author(s):  
R. M. Tejedor ◽  
J. L. Rodríguez ◽  
L. Oriol ◽  
J. L. Serrano
Keyword(s):  
Liquid Crystal ◽  
Synthesis And Characterization ◽  
Double Bonds
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