Simple model of the dielectric properties of cholesteric liquid crystals

1997 ◽  
Author(s):  
Jerzy Hoffmann ◽  
Barbara Stryla
Keyword(s):  
Liquid Crystals ◽  
Dielectric Properties ◽  
Simple Model ◽  
Cholesteric Liquid Crystals

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
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