Alignment of cholesteric liquid crystals using the macroscopic flexoelectric polarization contribution to dielectric properties

2013 ◽  
Vol 103 (14) ◽  
pp. 141111 ◽  
Author(s):  
B. I. Outram ◽  
S. J. Elston
Keyword(s):  
Liquid Crystals ◽  
Dielectric Properties ◽  
Cholesteric Liquid Crystals ◽  
Polarization Contribution

Dielectric properties of cholesteric liquid crystals

1972 ◽  
Vol 12 (2) ◽  
pp. 637-648 ◽  
Author(s):  
D. G. Shaw ◽  
J. W. Kauffman
Keyword(s):  
Liquid Crystals ◽  
Dielectric Properties ◽  
Cholesteric Liquid Crystals

scholarly journals Features of dielectric properties of medical thermal indicators based on dispersions of cholesteric liquid crystals in the polymer matrix

2020 ◽  
Vol 23 (04) ◽  
pp. 372-378
Author(s):  
O.V. Kovalchuk ◽  
◽  
V.Yo. Kotovskyi ◽  
V.E. Ovcharek ◽  
I.V. Oleinikova ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Dielectric Properties ◽  
Human Body ◽  
Electromagnetic Waves ◽  
Polyvinyl Acetate ◽  
Cholesteric Liquid Crystals ◽  
Selective Reflection ◽  
The Difference ◽  
Thermal Indicators ◽  
Frequency Dependences

Within the frequency range 10…106 Hz, the frequency dependences of the real (ε') and imaginary (ε") components of the complex dielectric permittivity of medical thermal indicators based on polyvinyl acetate and mixtures of cholesteric liquid crystals have been studied. In them, the selective reflection of electromagnetic waves visible to the human eye occurs at normal (36.6 °C) and elevated (38.2 °C) human body temperatures. Being based on the comparison of the ε' frequency dependences for the studied in this work dispersions of nematic liquid crystals prepared using the same technology and with the same polymer, it has been shown that, already on the basis of analysis of frequency dependences for ε', it is possible to ascertain the difference in characteristics for two types of thermal indicators. From the comparison of frequency dependences for ε", the main reasons of a difference between dielectric properties of the investigated medical thermal indicators for various temperatures of a human body have been ascertained.

SYNTHESIS AND DIELECTRIC PROPERTIES OF LIQUID CRYSTALS CONTAINING TWO CYANO GROUPS

1979 ◽  
Vol 40 (C3) ◽  
pp. C3-37-C3-40
Author(s):  
L. A. KARAMYSHEVA ◽  
S. I. TORGOVA ◽  
E. I. KOVSHEV ◽  
M. I. BARNIK
Keyword(s):  
Liquid Crystals ◽  
Dielectric Properties ◽  
Cyano Groups

scholarly journals Synthesis and Characterization of Novel Bio-Chiral Dopants Obtained from Bio-Betulin Produced by a Fermentation Process

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 785
Author(s):  
Veridiana G. Guimarães ◽  
Anastasiia Svanidze ◽  
Tianyi Guo ◽  
Pawan Nepal ◽  
Robert J. Twieg ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Natural Product ◽  
Fermentation Process ◽  
Synthesis And Characterization ◽  
Cholesteric Liquid Crystals ◽  
And Performance ◽  
Chiral Dopants

Cholesteric liquid crystals are frequently produced by the addition of chiral dopants to achiral nematic hosts. We report here the synthesis and performance of chiral dopants obtained from bio-betulin produced by a fermentation process. An important aspect of this work is to point out that the fermentation process used to obtain the starting materials is much easier and cheaper when carried out in large volumes than isolating it from the natural product. The performance of the dopants obtained from bio-betulin is indistinguishable from those obtained from commercially available synthetic betulin.

Sign in / Sign up

Export Citation Format

Share Document