Dielectric and Optical Studies in Smectic C of A Novel Hydrogen Bonded Liquid Crystal Homologous Series

2012 ◽  
Vol 562 (1) ◽  
pp. 177-190 ◽  
Author(s):  
N. Pongali Sathya Prabu ◽  
M. L. N Madhu Mohan
Keyword(s):  
Liquid Crystal ◽  
Homologous Series ◽  
Optical Studies ◽  
Smectic C ◽  
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.

Ambient Smectic Ordering in Hydrogen-Bonded Liquid Crystal Homologous Series

2011 ◽  
Vol 537 (1) ◽  
pp. 22-35 ◽  
Author(s):  
K. Murugadass ◽  
V. N. Vijayakumar ◽  
M. L. N. Madhu Mohan
Keyword(s):  
Liquid Crystal ◽  
Homologous Series ◽  
Hydrogen Bonded

Characterization of a hydrogen bonded liquid crystal homologous series: Detailed FTIR studies in various mesophases

2011 ◽  
Vol 994 (1-3) ◽  
pp. 387-391 ◽  
Author(s):  
N. Pongali Sathya Prabu ◽  
V.N. Vijayakumar ◽  
M.L.N. Madhu Mohan
Keyword(s):  
Liquid Crystal ◽  
Homologous Series ◽  
Ftir Studies ◽  
Hydrogen Bonded

New amphiphilic materials showing the lyotropic analogue to the thermotropic smectic C* liquid crystal phase

2017 ◽  
Vol 5 (30) ◽  
pp. 7452-7457 ◽  
Author(s):  
Marc D. Harjung ◽  
Christopher P. J. Schubert ◽  
Friederike Knecht ◽  
Jan H. Porada ◽  
Robert P. Lemieux ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Smectic C

Two new examples of the lyotropic analog to the thermotropic ferroelectric SmC* phase were found recently.

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