Enhancement of the orientational order parameter of nematic liquid crystals in thin cells

2004 ◽  
Vol 13 (4) ◽  
pp. 401-408 ◽  
Author(s):  
Surajit Dhara ◽  
N. V. Madhusudana
Keyword(s):  
Liquid Crystals ◽  
Order Parameter ◽  
Nematic Liquid Crystals ◽  
Orientational Order ◽  
Orientational Order Parameter

Elastic Constants of Nematic Phenylpyrimidines Determined by Two Different Methods

1990 ◽  
Vol 45 (1) ◽  
pp. 37-42 ◽  
Author(s):  
A. Scharkowski ◽  
H. Schmiedel ◽  
R. Stannarius ◽  
E. Weißhuhn
Keyword(s):  
Liquid Crystals ◽  
Temperature Dependence ◽  
Elastic Constants ◽  
Optical Method ◽  
Order Parameter ◽  
Diamagnetic Susceptibility ◽  
Orientational Order ◽  
Orientational Order Parameter ◽  
H Nmr ◽  
Electric And Magnetic Fields

AbstractA survey of various methods to measure the elastic constants Ki of nematic liquid crystals is given. To determine K1, K3 and the anisotropy of the diamagnetic susceptibility Δx of two members of the 5n-hexyl-2-[4n-alkyloxy-phenyl]-pyrimidines and a mixture of both, we used a combined electromagneto- optical method, consisting in independent measurements of the optical phase difference in electric and magnetic fields acting on the same cell. The temperature dependence of the K1- and K3-values for these phenylpyrimidines can be explained by common theories. The Δx data show the same temperature dependence as the values of the orientational order parameter S obtained by 1H-NMR.

scholarly journals An Optical Study to Estimate Orientational Order Parameter on Some Benzylideneaminophenylbenzoate Liquid Crystals

2016 ◽  
Vol 129 (3) ◽  
pp. 284-288 ◽  
Author(s):  
C.M. Subhan ◽  
R. Jeevan Kumar ◽  
P. Panduranga ◽  
B. Jayashreeand ◽  
K. Fakruddin
Keyword(s):  
Liquid Crystals ◽  
Order Parameter ◽  
Orientational Order ◽  
Orientational Order Parameter ◽  
Optical Study
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