Tilt Angle, Spontaneous Polarization and LF Dielectric Relaxation Investigations in the Chiral Nematic and Smectic-C* Phases of a Hydrogen Bonded Ferroelectric Liquid Crystal (HBFLC)—11 bpa

2007 ◽  
Vol 361 (1) ◽  
pp. 18-36 ◽  
Author(s):  
B. Sreedevi ◽  
P. V. Chalapathi ◽  
V. K. M. Kotikalapudi ◽  
V. G. K. M. Pisipati ◽  
D. M. Potukuchi
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Tilt Angle ◽  
Spontaneous Polarization ◽  
Ferroelectric Liquid Crystal ◽  
Smectic C ◽  
Chiral Nematic ◽  
Hydrogen Bonded

Spontaneous polarization, tilt angle, hysteresis and low-frequency relaxations in hydrogen bonded chiral liquid crystal dimer: M*SA:9OBA

2019 ◽  
Vol 551 (1) ◽  
pp. 178-196
Author(s):  
Mosalikanti Surekha ◽  
Attaluri Venkata Naga Ashok Kumar ◽  
Pallavajhula Venkata Chalapathy ◽  
Dakshina Murthy Potukuchi
Keyword(s):  
Liquid Crystal ◽  
Tilt Angle ◽  
Spontaneous Polarization ◽  
Low Frequency ◽  
Chiral Liquid Crystal ◽  
Hydrogen Bonded

Design, Synthesis and Characterization of Hydrogen Bonded Binary Liquid Crystal Complex from 4-Methoxycinnamic Acid and 4-Hexyloxybenzoic Acid (4MCA:6OBA)

2017 ◽  
Vol 231 (11-12) ◽  
Author(s):  
Thamilarasan Ranjeeth Kumar ◽  
Sankaran Sundaram ◽  
Thangaiyan Chitravel ◽  
Ramasamy Jayaprakasam ◽  
Vellalapalayam Nallagounder Vijayakumar
Keyword(s):  
Liquid Crystal ◽  
Binary Mixture ◽  
Tilt Angle ◽  
Phase Variation ◽  
Optical Microscope ◽  
Scanning Calorimetry ◽  
Smectic C ◽  
Ir Studies ◽  
Methoxycinnamic Acid ◽  
Hydrogen Bonded

AbstractHydrogen bonded liquid crystal (HBLC) binary mixture has been synthesized from mesogenic 4-methoxycinnamic acid (4MCA) and mesogenic 4-hexyloxybenzoic acid (6OBA) with different mole ratio. The mesomorphic phase behavior and corresponding phase transition temperatures along with the enthalpy values were investigated by differential scanning calorimetry (DSC). The characteristic textures of 4MCA+6OBA binary mixture were observed by using polarizing optical microscope (POM). Fourier transform infrared spectroscopic (FT-IR) studies confirm the formation of hydrogen bond in the present binary mixture. A note worthy observation in this complex is that pure mesogens have no smectic phase where as 4MCA+6OBA binary mixture exhibits a nematic phase along with higher order smectic C (Sm C) phase. Variation of mole ratio influences thermal properties such as phase peak, enthalpy values and thermal span width of the present HBLC binary mixture complex. The optical tilt angle of 4MCA+6OBA for smectic C phase and thermal stability factors have been investigated. Optical tilt angle for smectic C phase is determined and same is fitted to a power law.

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.

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