scholarly journals Local structure in nematic and isotropic liquid crystals

2003 ◽  
Vol 119 (2) ◽  
pp. 1214-1222 ◽  
Author(s):  
Nguyen Hoang Phuong ◽  
Friederike Schmid
Keyword(s):  
Liquid Crystals ◽  
Local Structure ◽  
Isotropic Liquid

Optically isotropic liquid crystal media formulated by doping star-shaped cyclic oligosiloxane liquid crystal surfactants in twin nematic liquid crystals

Soft Matter ◽  
2015 ◽  
Vol 11 (19) ◽  
pp. 3772-3779 ◽  
Author(s):  
Namil Kim ◽  
Dae-Yoon Kim ◽  
Minwook Park ◽  
Yu-Jin Choi ◽  
Soeun Kim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Isotropic Liquid

The formation of an optically isotropic liquid crystal (LC) medium by doping the star-shaped LC molecular surfactant in a nematic LC medium may allow us to develop new electro-optical LC devices.

scholarly journals Activity Induced Nematic Order in Isotropic Liquid Crystals

2020 ◽  
Vol 180 (1-6) ◽  
pp. 699-709
Author(s):  
Sreejith Santhosh ◽  
Mehrana R. Nejad ◽  
Amin Doostmohammadi ◽  
Julia M. Yeomans ◽  
Sumesh P. Thampi
Keyword(s):  
Liquid Crystals ◽  
Isotropic Liquid ◽  
Nematic Order

Effects of stabilization temperatures on electro-optic characteristics of polymer-stabilized optically isotropic liquid crystals

2010 ◽  
Vol 10 (4) ◽  
pp. e113-e117 ◽  
Author(s):  
Miyoung Kim ◽  
Byeong Gyun Kang ◽  
Min Su Kim ◽  
Mi-Kyung Kim ◽  
Myong-Hoon Lee ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Isotropic Liquid ◽  
Electro Optic ◽  
Polymer Stabilized

Discotic liquid crystals of transition metal complexes 38†: peripheral chain substituent position effect on columnar mesophase and stacking structures of novel phthalocyanine-based liquid crystals

2007 ◽  
Vol 11 (07) ◽  
pp. 503-512 ◽  
Author(s):  
Masahiro Ichihara ◽  
Ayumi Suzuki ◽  
Kazuaki Hatsusaka ◽  
Kazuchika Ohta
Keyword(s):  
Liquid Crystals ◽  
Position Effect ◽  
Optical Microscope ◽  
Central Core ◽  
Ortho Position ◽  
Discotic Liquid Crystals ◽  
Isotropic Liquid ◽  
X Ray ◽  
Phenoxy Group ◽  
Columnar Mesophases

In order to clarify the peripheral chain substitution position effect on columnar mesophase and stacking structures, we have synthesized three novel series of discotic liquid crystals (1-3) having octakis(phenoxy)phthalocyaninato copper(II) as a central core and one peripheral chain at the para position (1), meta position (2) or ortho position (3) of each phenoxy group, and three more novel series of discotic liquid crystals (4-6) having the same central core and two peripheral chains at para and meta positions (4), meta and meta positions (5) or ortho and meta positions (6) of each phenoxy group. Their columnar mesophase and stacking structures were investigated with a polarizing optical microscope, a differential scanning calorimeter and a temperature-dependent X-ray diffractometer. According to the results, their columnar mesophase and stacking structures strongly depended on the peripheral chain substitution positions and the number of peripheral chains. Derivatives 3 and 5 are viscous isotropic liquid at room temperature. Derivatives 1, 2, 4 and 6 exhibit various kinds of columnar mesophases: 1 Colhd; 2 Colhd and Colho; 4 Colhd, Colrd(P21/a), Coltet.d and Cub ( Pn [ three bar ] m ); 6 Colhd, Colrd(P21/a) and Colrd(X). Moreover, derivatives 1, 4 and 6 exhibit disordered columnar mesophases. However, derivative 2 only exhibits an ordered columnar mesophase and its X-ray diffraction pattern shows a sharp reflection corresponding to a very short intracolumnar stacking distance of 3.33 Å. Thus, we can drastically change the mesophase and stacking structures by the peripheral chain substitution positions and the number of peripheral chains at each phenoxy group. This is a new way of controlling mesomorphic structure.

H-shaped liquid crystals inducing nematic order in the isotropic liquid

2019 ◽  
Vol 46 (12) ◽  
pp. 1756-1762 ◽  
Author(s):  
Shoumi Sayama ◽  
Ryosuke Muraki ◽  
Atsushi Yoshizawa
Keyword(s):  
Liquid Crystals ◽  
Isotropic Liquid ◽  
Nematic Order

Do isotropic liquid crystals exist?

2003 ◽  
Vol 94 (11) ◽  
pp. 7363-7364
Author(s):  
A. Cemal Eringen
Keyword(s):  
Liquid Crystals ◽  
Isotropic Liquid

scholarly journals LIQUID CRYSTALS AND APPLICATIONS OF CHLOSTERIC LIQUID CRYSTAL IN LASER

2013 ◽  
Vol 22 ◽  
pp. 736-740 ◽  
Author(s):  
SURESH SONI ◽  
DIMPLE DHARNIYA BISHNOI ◽  
SUBHASH SONI ◽  
RAMSWROOP
Keyword(s):  
Mechanical Properties ◽  
Magnetic Properties ◽  
Liquid Crystals ◽  
Resonant Cavity ◽  
Crystalline Solid ◽  
Smectic Liquid Crystals ◽  
Isotropic Liquid ◽  
Electrical And Magnetic Properties ◽  
Chiral Nematic ◽  
State Of Matter

Liquid crystals are a state of matter intermediate between that of a crystalline solid and an isotropic liquid. They possess many of the mechanical properties of a liquid, e.g. - high fluidity, inability to support shear, formation, and coalescence of droplets. At the same time they are similar to crystals in that they exhibit anisotropy in their optical, electrical, and magnetic properties. We discuss some physical properties of nematic, cholesteric, and smectic liquid crystals (Specially focused on cholesteric) and some applications in laser due to Cholesteric Liquid Crystal’s resonant cavity which formed spontaneously and intrinsically, in the form of self-assembled chiral nematic helix.

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