AC electric field induced flow and helix unwinding in focal conic texture of smectic C* liquid crystal

We consider a chiral smectic C liquid crystal confined between parallel plates in the bookshelf geometry. Using a recently proposed continuum theory for such materials the behaviour of the cell is discussed when an electric field is applied and subsequently removed from the cell. We examine both symmetric and asymmetric boundary conditions for the director.

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Deformation of liquid crystal droplets under the action of an external ac electric field

Physical Review E ◽

10.1103/physreve.64.021706 ◽

2001 ◽

Vol 64 (2) ◽

Cited By ~ 6

Author(s):

B. I. Lev ◽

V. G. Nazarenko ◽

A. B. Nych ◽

D. Schur ◽

P. M. Tomchuk ◽

...

Keyword(s):

Liquid Crystal ◽

Electric Field ◽

Ac Electric Field

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

Japanese Journal of Applied Physics ◽

10.1143/jjap.30.l612 ◽

1991 ◽

Vol 30 (Part 2, No. 4A) ◽

pp. L612-L615 ◽

Cited By ~ 7

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

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Bidirectional rotation control of a carbon fiber in nematic liquid crystal using AC electric field

Scientific Reports ◽

10.1038/s41598-020-75644-y ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Jun-Yong Lee ◽

Jeong-Seon Yu ◽

Jong-Hyun Kim

Keyword(s):

Free Energy ◽

Liquid Crystal ◽

Electric Field ◽

Colloidal Particles ◽

Colloidal System ◽

Wide Angle ◽

Local Minima ◽

Free Energies ◽

Rotation Direction ◽

Ac Electric Field

Abstract Colloidal particles dispersed in nematic liquid crystals are aligned along the orientation that minimizes the elastic free energy. Through applying an electric field to a nematic colloidal system, the orientation of the director can change. Consequently, colloidal particles realign to minimize the total free energy, which is the sum of the elastic and electric free energies. Herein, we demonstrate that if the preferred rotation directions given by the electric and elastic free energies are different during realignment, the rotation direction of the particle can be controlled by how we apply the electric field. When the strength of the electric field gradually increases, the particles rotate in the same direction as the rotation of the director. However, when a sufficiently high electric field is suddenly applied, the particles rotate in the opposite direction. In this study, we analyzed the effect of free energy on the bidirectional rotation behavior of the particles using a theoretical model. This study provides an effective approach to control the rotational behavior of colloidal particles over a wide-angle range between two orientational local minima.

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