Optical measurement of the director relaxation time in a periodically reoriented nematic liquid crystal

1999 ◽  
Vol 86 (6) ◽  
pp. 3042-3047 ◽  
Author(s):  
P. L. Papadopoulos ◽  
H. M. Zenginoglou ◽  
J. A. Kosmopoulos
Keyword(s):  
Relaxation Time ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Measurement

scholarly journals Electrical Properties of Zn-Phthalocyanine and Poly (3-hexylthiophene) Doped Nematic Liquid Crystal

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Y. Karakuş ◽  
M. Okutan ◽  
A. Kösemen ◽  
S. E. San ◽  
Z. Alpaslan ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Liquid Crystal ◽  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Absorption Coefficient ◽  
Nematic Liquid Crystal ◽  
Critical Frequency ◽  
Relaxation Times ◽  
Zinc Phthalocyanine ◽  
Absorption Coefficients

An E7 coded nematic liquid crystal was doped with zinc phthalocyanine and poly (3-hexylthiophene). A variety of properties including relaxation time, absorption coefficient, and critical frequency of this doped system were investigated using impedance spectroscopy. The doped systems displayed increased absorption coefficients in the range 0.22–0.55 and relaxation times from5.05×10−7 s to3.59×10−6 s with a decrease in the critical frequency from 3.54 MHz to 2.048 MHz.

scholarly journals Dynamic behavior of a nematic liquid crystal with added carbon nanotubes in an electric field

2018 ◽  
Vol 9 ◽  
pp. 233-241 ◽  
Author(s):  
Emil Petrescu ◽  
Cristina Cirtoaje
Keyword(s):  
Carbon Nanotubes ◽  
Relaxation Time ◽  
Liquid Crystal ◽  
Electric Field ◽  
Dynamic Behavior ◽  
Nematic Liquid Crystal ◽  
Relaxation Times ◽  
Continuum Theory ◽  
Pure Liquid ◽  
Significant Difference

The dynamic behavior of a nematic liquid crystal with added carbon nanotubes (CNTs) in an electric field was analyzed. A theoretical model based on elastic continuum theory was developed and the relaxation times of nematic liquid crystals with CNTs were evaluated. Experiments made with single-walled carbon nanotubes dispersed in nematic 4-cyano-4’-pentylbiphenyl (5CB) indicated a significant difference of the relaxation time when compared to pure liquid crystal. We also noticed that the relaxation time when the field is switched off depends on how long the field was applied. It is shorter when the field is switched off immediately after application and longer when the field was applied for at least one hour.

Optical Measurement of Local Director Distribution in a Distorted Nematic Liquid Crystal

1993 ◽  
Vol 21 (2) ◽  
pp. 189-194 ◽  
Author(s):  
F Simoni ◽  
F Bloisi ◽  
L Vicari ◽  
M Warenghem ◽  
M Ismaili ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Measurement

scholarly journals Lifting degeneracy in nematic liquid crystal viscosities with a single optical measurement

2017 ◽  
Vol 497 ◽  
pp. 201-206 ◽  
Author(s):  
T.P. Bennett ◽  
M.B. Proctor ◽  
M. Kaczmarek ◽  
G. D’Alessandro
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Measurement
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