scholarly journals A helical naphthopyran dopant for photoresponsive cholesteric liquid crystals

2017 ◽  
Vol 53 (1) ◽  
pp. 200-203 ◽  
Author(s):  
Yuna Kim ◽  
Michel Frigoli ◽  
Nicolas Vanthuyne ◽  
Nobuyuki Tamaoki
Keyword(s):  
Liquid Crystals ◽  
Rotational Motion ◽  
Cholesteric Liquid Crystals ◽  
Power Switching ◽  
Helical Twisting Power

Photoisomerization of helical naphthopyran in cholesteric liquid crystals exhibited huge helical twisting power switching of over 90% resulting in significantly efficient rotational motion of micro-sized objects.

Tuning helical twisting power and photoisomerisation kinetics of axially chiral cyclic azobenzene dopants in cholesteric liquid crystals

2019 ◽  
Vol 46 (15) ◽  
pp. 2181-2189 ◽  
Author(s):  
Mengyi Zhou ◽  
Hongbo Lu ◽  
Xinmin Zhang ◽  
Qiang Zhang ◽  
Miao Xu ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Axially Chiral ◽  
Kinetics Of ◽  
Helical Twisting Power

Novel planar chiral dopants with high helical twisting power and structure-dependent functions

2016 ◽  
Vol 4 (40) ◽  
pp. 9576-9580 ◽  
Author(s):  
Jinjie Lu ◽  
Wei Gu ◽  
Jia Wei ◽  
Wei Zhang ◽  
Zhengbiao Zhang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Chiral Dopants ◽  
Helical Twisting Power

Three kinds of novel planar chiral azobenzenophane with high HTP values were synthesized. Then, cholesteric liquid crystals with different screw directions were induced by them successfully. And reversible tuning between orange and green reflection colors was achieved.

Relationship between molecular structures of uniquely designed C2-symmetric axially chiral dopants and their helical twisting properties in cholesteric liquid crystals

2019 ◽  
Vol 7 (8) ◽  
pp. 2225-2231 ◽  
Author(s):  
Daisuke Yoshizawa ◽  
Hiroki Higuchi ◽  
Yasushi Okumura ◽  
Hirotsugu Kikuchi
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Temperature Dependence ◽  
Molecular Structures ◽  
Positive Temperature ◽  
Cholesteric Liquid Crystals ◽  
Axially Chiral ◽  
Enhanced Properties ◽  
Chiral Dopants ◽  
Helical Twisting Power

9,9′-biphenanthrene-type chiral dopants were newly synthesized for the development of functional liquid crystal (LC) materials with enhanced properties. A cholesteric LC (CLC) with a chiral dopant showed positive temperature dependence of helical twisting power and a CLC with temperature independence was developed by mixing two types of chiral dopants.

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