Studies on Room Temperature Ferroelectric Liquid Crystal, 12CN5(R*)

2004 ◽  
Vol 59 (1-2) ◽  
pp. 97-99
Author(s):  
A. K. George ◽  
Venkata G. K. M. Pisipati ◽  
C. Carboni ◽  
S.H. Al Harthi ◽  
J. Naciri
Keyword(s):  
Liquid Crystal ◽  
Tilt Angle ◽  
Room Temperature ◽  
Switching Time ◽  
Mean Field ◽  
Ferroelectric Liquid Crystal ◽  
Smectic C ◽  
Phase Sequence ◽  
Characterization Studies ◽  
The Mean

Characterization studies are performed on a ferroelectric liquid crystal, 12CN5(R*). Phase sequence and transition temperatures are obtained by polarized thermal microscopy. Temperature variation of spontaneous polarization and tilt angle in the smectic C* phase are found to agree with the mean-field predictions. Results obtained for the variation of the switching time and torsional viscosity with temperature are also presented.

scholarly journals Calculation of the tilt angle and susceptibility as functions of temperature and the electric field close to the Sm A – Sm C* transition in C7

2018 ◽  
Vol 96 (7) ◽  
pp. 688-692 ◽  
Author(s):  
S. Aksoy ◽  
H. Yurtseven ◽  
M. Kurt
Keyword(s):  
Field Theory ◽  
Free Energy ◽  
Electric Field ◽  
Tilt Angle ◽  
Mean Field Theory ◽  
Mean Field ◽  
Constant Field ◽  
Smectic A ◽  
Smectic C ◽  
The Mean

Smectic A – Smectic C* transition in the ferroelectric liquid crystal (C7) is studied as a function of the electric field and the temperature. By expanding the free energy in terms of the tilt angle θ (Smectic C* phase) and the polarization P with a linear coupling between θ and P (Pθ) in mean field theory, the tilt angle is calculated as a function of the electric field (θ versus E) at constant temperatures with respect to the transition temperature for C7 using the observed data from the literature. Also, by extracting the tilt angle from the observed electric displacements at various temperatures (at constant field strength) the inverse tilt angle susceptibility ([Formula: see text]), derived from the free energy, is fitted to the observed data for the dielectric constant and the fitted parameters are determined. Our calculated θ and χθ. show that the mean field theory explains adequately the observed behavior of the Smectic A – Smectic C* transition in the liquid crystals C7.

Total-Reflection Switch Using High-Tilt-Angle Cholesteric-Smectic C*Phase Transition Ferroelectric Liquid Crystal

1991 ◽  
Vol 30 (Part 1, No. 10) ◽  
pp. 2535-2539 ◽  
Author(s):  
Ashok Manikrao Biradar ◽  
Sukhwant Singh Bawa ◽  
Chhatra Pal Sharma ◽  
Subhas Chandra
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Tilt Angle ◽  
Total Reflection ◽  
Ferroelectric Liquid Crystal ◽  
Smectic C
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