Electrorheological Effect in the Nematic and the Smectic A Phases of Low Molecular Weight Liquid Crystal

1999 ◽  
Vol 13 (14n16) ◽  
pp. 2005-2010 ◽  
Author(s):  
Keishi Negita
Keyword(s):  
Phase Transition ◽  
Molecular Weight ◽  
Liquid Crystal ◽  
Electric Field ◽  
Low Molecular Weight ◽  
Large Decrease ◽  
Smectic A ◽  
General Properties ◽  
Electrorheological Effect ◽  
Phase Sequence

Electrorheological (ER) effects in the nematic (Ne), the smectic A (SmA) and the isotropic (Is) phases of octyloxy cyanobiphenyl (8OCB) are studied. When an electric field is applied, a large decrease of the viscosity is observed in the Sm A phase, while in the Ne phase an increase of the viscosity is recognized with an anomalous ER effect near the SmA-Ne phase transition. These behaviors are suggested to be general properties of the liquid crystal exhibiting the phase sequence of SmA-Ne-Is.

Rheo-dielectric behavior of low molecular weight liquid crystal 2. Behavior of 8CB in nematic and smectic states

1999 ◽  
Vol 38 (2) ◽  
pp. 100-107 ◽  
Author(s):  
Hiroshi Watanabe ◽  
Tomohiro Sato ◽  
Motoyuki Hirose ◽  
Kunihiro Osaki ◽  
Ming-Long Yao
Keyword(s):  
Molecular Weight ◽  
Liquid Crystal ◽  
Dielectric Behavior ◽  
Low Molecular Weight

Electric-Field-Dependent Tilt (Cone) Angle in a Chiral Smectic C Liquid Crystal Showing Electroclinic Effect in the Smectic A Phase

1991 ◽  
Vol 30 (Part 2, No. 4A) ◽  
pp. L612-L615 ◽  
Author(s):  
Ying-Bao Yang ◽  
Akihiro Mochizuki ◽  
Naoto Nakamura ◽  
Shunsuke Kobayashi
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Cone Angle ◽  
Smectic A ◽  
Smectic C ◽  
Field Dependent ◽  
Smectic A Phase

scholarly journals Reversible gel–sol photoswitching with an overcrowded alkene-based bis-urea supergelator

2016 ◽  
Vol 7 (7) ◽  
pp. 4341-4346 ◽  
Author(s):  
Sander J. Wezenberg ◽  
Christelle M. Croisetu ◽  
Marc C. A. Stuart ◽  
Ben L. Feringa
Keyword(s):  
Phase Transition ◽  
Molecular Weight ◽  
Uv Irradiation ◽  
Low Molecular Weight ◽  
Reversible Gel

A low-molecular-weight organogel composed of photoresponsive bis-urea gelators can undergo a reversible gel–sol phase transition upon UV irradiation.

scholarly journals Thermally tunable selective formation of self-assembled fibers into two orthogonal directions in oriented liquid-crystalline smectic templates

2020 ◽  
Vol 56 (69) ◽  
pp. 9954-9957
Author(s):  
Daisuke Yamaguchi ◽  
Yuka Ikemoto ◽  
Takashi Kato
Keyword(s):  
Molecular Weight ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Layered Structures ◽  
Low Molecular Weight ◽  
Smectic A ◽  
Orthogonal Grid ◽  
Self Assembled ◽  
Low Molecular Weight Gelators ◽  
Selective Formation

Two orthogonal (grid-like) and one directional fibrous structures are selectively formed through anisotropic self-assembly of low-molecular-weight gelators in liquid-crystalline smectic A templates depending on thermally tuned layered structures.

scholarly journals Optical Microscopy Observations and Construction of Dupin Cyclides at the Isotropic/Smectic A Phase Transition

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4539
Author(s):  
Mikhael Halaby Macary ◽  
Gauthier Damême ◽  
Antoine Gibek ◽  
Valentin Dubuffet ◽  
Benoît Dupuy ◽  
...  
Keyword(s):  
Phase Transition ◽  
Numerical Simulation ◽  
Liquid Crystal ◽  
Optical Microscopy ◽  
Smectic A ◽  
Polarized Microscopy ◽  
Smectic A Phase ◽  
Dupin Cyclides

In this work, we are interested in the nucleation of bâtonnets at the Isotropic/Smectic A phase transition of 10CB liquid crystal. Very often, these bâtonnets are decorated with a large number of focal conics. We present here an example of a bâtonnet obtained by optical crossed polarized microscopy in a frequently observed particular area of the sample. This bâtonnet presents bulges and one of them consists of a tessellation of ellipses. These ellipses are two by two tangent, one to each other, and their confocal hyperbolas merge at the apex of the bâtonnet. We propose a numerical simulation with Python software to reproduce this tiling of ellipses as well as the shape of the smectic layers taking the well-known shape of Dupin cyclides within this particular bâtonnet area.

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