Nano particles induced vertical alignment of liquid crystal for display devices with augmented morphological and electro-optical characteristics

2019 ◽  
Vol 1196 ◽  
pp. 866-873 ◽  
Author(s):  
Chinky ◽  
Pankaj Kumar ◽  
Vandna Sharma ◽  
Praveen Malik ◽  
K.K. Raina
Keyword(s):  
Liquid Crystal ◽  
Nano Particles ◽  
Optical Characteristics ◽  
Vertical Alignment ◽  
Display Devices

scholarly journals Gram-scale preparation of negative-type liquid crystals with a CF2CF2-carbocycle unit via an improved short-step synthetic protocol

2018 ◽  
Vol 14 ◽  
pp. 148-154 ◽  
Author(s):  
Tatsuya Kumon ◽  
Shohei Hashishita ◽  
Takumi Kida ◽  
Shigeyuki Yamada ◽  
Takashi Ishihara ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Vertical Alignment ◽  
Display Devices ◽  
Negative Type ◽  
Scale Preparation

Herein, we demonstrate an improved short-step protocol for the synthesis of multicyclic molecules having a CF2CF2-containing cyclohexadiene or cyclohexane framework in a mesogenic structure. These molecules are promising candidates for vertical alignment (VA)-mode liquid crystal (LC) display devices owing to their large negative dielectric constant. The tetrafluorinated multicyclic molecules were successfully obtained in only five or six reaction steps without the need for special handling techniques, as is generally required for thermally unstable organometallic species, representing a reduction of three reaction steps. The improved short-step synthetic protocol was also amenable to the multigram preparation of these promising molecules, which may contribute significantly to the development of novel negative-type LC molecules containing CF2CF2 carbocycles.

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