scholarly journals Coexistence of light-induced thermocapillary and orientational effects in thin nematic films with a free surface

2021 ◽  
Vol 2067 (1) ◽  
pp. 012016
Author(s):  
S.A. Shvetsov ◽  
A.S. Zolot’ko ◽  
G.A. Voronin ◽  
A.V. Emelyanenko ◽  
P.A. Statsenko ◽  
...  
Keyword(s):  
Free Surface ◽  
Liquid Crystal ◽  
Light Beam ◽  
Nematic Liquid Crystal ◽  
Beam Irradiation ◽  
Absorbing Substrate

Abstract The effect of nonlinear light action on a thin (∼10 µm) films of the nematic liquid crystal deposited onto the absorbing substrate is experimentally investigated. The dynamics of the orientational and thermocapillary effects is directly studied. The two types of orientational processes were found out. The first one appears for several hundreds of milliseconds when the light beam irradiation is turned on or off. The second one develops much slowly and does not relax during the light beam irradiation.

Three-dimensional coating flow of nematic liquid crystal on an inclined substrate

2015 ◽  
Vol 26 (5) ◽  
pp. 647-669 ◽  
Author(s):  
M. A. LAM ◽  
L. J. CUMMINGS ◽  
T.-S. LIN ◽  
L. KONDIC
Keyword(s):  
Free Surface ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Nonlinear Partial Differential Equation ◽  
Three Dimensional ◽  
Travelling Wave ◽  
Linear Stability Theory ◽  
Newtonian Flow ◽  
Surface Evolution ◽  
Coating Flow

We consider a coating flow of nematic liquid crystal (NLC) fluid film on an inclined substrate. Exploiting the small aspect ratio in the geometry of interest, a fourth-order nonlinear partial differential equation is used to model the free surface evolution. Particular attention is paid to the interplay between the bulk elasticity and the anchoring conditions at the substrate and free surface. Previous results have shown that there exist two-dimensional travelling wave solutions that translate down the substrate. In contrast to the analogous Newtonian flow, such solutions may be unstable to streamwise perturbations. Extending well-known results for Newtonian flow, we analyse the stability of the front with respect to transverse perturbations. Using full numerical simulations, we validate the linear stability theory and present examples of downslope flow of nematic liquid crystal in the presence of both transverse and streamwise instabilities.

scholarly journals LC Aligning Capabilities of a Nematic Liquid Crystal on Homeotropic Polyimide Surface by New Ion-beam Irradiation

2007 ◽  
Vol 8 (6) ◽  
pp. 265-267
Author(s):  
Chul-Ho Ok ◽  
Dong-Hun Kang ◽  
Kang-Min Lee ◽  
Jin-Woo Han ◽  
Byoung-Yong Kim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Ion Beam ◽  
Beam Irradiation ◽  
Ion Beam Irradiation
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