scholarly journals Collective Diffusion of Colloidal Particles in a Liquid Crystal

2019 ◽  
Vol 64 (1) ◽  
pp. 48
Author(s):  
B. I. Lev ◽  
A. G. Zagorodny
Keyword(s):  
Diffusion Coefficient ◽  
Liquid Crystal ◽  
Colloidal Particles ◽  
Particle Density ◽  
Interparticle Interaction ◽  
Director Field ◽  
Diffusion Effects ◽  
Elastic Distortion

The theory of collective diffusion effects in a system of colloidal particles in a liquid crystal is proposed. The specifics of diffusion which can be observed experimentally are described. The dependence of the diffusion coefficient on the temperature and particle density is found. It is shown that collective diffusion in a system of colloidal particles in a liquid crystal arises from the elastic distortion of the director field generating the interparticle interaction. The behavior of such diffusion is found to be nontrivial.

scholarly journals Dynamic tuning of the director field in liquid crystal shells using block copolymers

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
JungHyun Noh ◽  
Yiwei Wang ◽  
Hsin-Ling Liang ◽  
Venkata Subba Rao Jampani ◽  
Apala Majumdar ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Block Copolymers ◽  
Director Field ◽  
Dynamic Tuning

A Chiral Director Field in the Nematic Liquid Crystal Phase Induced by a Poly(.gamma.-benzyl glutamate) Chemical Reaction Alignment Film

Langmuir ◽  
1995 ◽  
Vol 11 (12) ◽  
pp. 4838-4843 ◽  
Author(s):  
Shigeru Machida ◽  
Taeko I. Urano ◽  
Kenji Sano ◽  
Yasushi Kawata ◽  
Kazuyuki Sunohara ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Chemical Reaction ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Director Field

Patchy colloidal particles at the fluid–fluid interface

Soft Matter ◽  
2018 ◽  
Vol 14 (46) ◽  
pp. 9457-9465 ◽  
Author(s):  
Chung Chi Chio ◽  
Ying-Lung Steve Tse
Keyword(s):  
Colloidal Particles ◽  
Particle Density ◽  
Fluid Interface ◽  
Depletion Force

Imbalance of solvent particle density leads to depletion force.

Simulation and Experimental Measurement of Liquid Crystal Polymer Orientation During Injection Molding

MRS Advances ◽  
2018 ◽  
Vol 3 (39) ◽  
pp. 2311-2316
Author(s):  
Anthony Sullivan ◽  
Anil Saigal ◽  
Michael A. Zimmerman
Keyword(s):  
Liquid Crystal ◽  
Melt Processing ◽  
Engineering Properties ◽  
Liquid Crystal Polymers ◽  
Director Field ◽  
X Ray Scattering ◽  
Molecular Ordering ◽  
Orientation State ◽  
Degree Of Order ◽  
Good Agreement

AbstractLiquid crystal polymers (LCP’s) comprise a class of materials that derive desirable, but anisotropic, engineering properties from long-range molecular ordering. The ability to model the polymer texture is essential to the design of manufacturing processes for isotropic material production. Previous efforts to model LCP directionality have been primarily restricted to structured grids and simple geometries that demonstrate the underlying theory, but fall short of simulating realistic manufacturing geometries. In this investigation, a practical methodology is proposed to simulate the director field in full-scale melt-processing domains and wide-angle x-ray scattering (WAXS) is used to experimentally validate modeling results. It is shown that the model generates good agreement with experimental measurements of both the orientation state and degree of order.

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

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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