Rotational model for nematic phase stability of fluorinated phenylbicyclohexane liquid crystals.
A mechanical molecular rotation model for liquid crystal (LC) systems is employed to evaluate phase transition temperature of fluorinated phenylbicyclohexane isomeric LC compounds. Results show that when a fluorine atom is substituted along the molecular long axis, an LC molecule acquires high rotational speed and its rotation becomes stable, thereby resulting in a better thermal stability of the nematic phase. A novel explanation is proposed for the behavior of the nematic-isotropic phase of the LC system when a heavy atom is substituted along the molecular long axis.
Ma
Heng
H
Department of Physics, Henan Normal University, Xinxiang 453007, China. hengma@henannu.edu.cn
Li
Zhen-Xin
ZX
Shi
De-Heng
DH
Liu
Yu-Fang
YF
D003512:Cyclohexanones / Q000737:chemistry*; D017611:Fluorine Compounds / Q000737:chemistry*; D050866:Liquid Crystals / Q000737:chemistry*; D008958:Models, Molecular; D044367:Phase Transition; D012399:Rotation; D013696:Temperature; D044366:Transition Temperature
D003512:Cyclohexanones; D017611:Fluorine Compounds; C009729:bicyclohexanone