Circular flow formation triggered by Marangoni convection in nematic liquid crystal films with a free surface

Soft Matter ◽  
2016 ◽  
Vol 12 (2) ◽  
pp. 481-485 ◽  
Author(s):  
Hyunhee Choi ◽  
Hideo Takezoe
Keyword(s):  
Free Surface ◽  
Liquid Crystal ◽  
Laser Beam ◽  
Marangoni Convection ◽  
Beam Irradiation ◽  
Circular Flow ◽  
Liquid Crystal Films ◽  
Flow Formation ◽  
Laser Beam Irradiation ◽  
Crystal Films

We demonstrate circular flow formation at a surface in homeotropically oriented nematic liquid crystals with a free surface using focused laser beam irradiation.

scholarly journals Effects of spatially-varying substrate anchoring on instabilities and dewetting of thin nematic liquid crystal films

Soft Matter ◽  
2020 ◽  
Vol 16 (44) ◽  
pp. 10187-10197
Author(s):  
Michael-Angelo Y.-H. Lam ◽  
Lou Kondic ◽  
Linda J. Cummings
Keyword(s):  
Free Surface ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Surface Evolution ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Spatially Varying ◽  
Variable Substrate

We investigate (theoretically and numerically) free surface evolution of nematic liquid crystal films in the presence of variable substrate anchoring.

Orientational phenomena in comb-shaped liquid crystal polymers induced by laser beam irradiation

1995 ◽  
Vol 96 (1) ◽  
pp. 157-159 ◽  
Author(s):  
Valéry Shibaev ◽  
Sergey Kostromin ◽  
Sergey Ivanov ◽  
Lutz Läsker ◽  
Thomas Fisher ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Liquid Crystal Polymers ◽  
Beam Irradiation ◽  
Laser Beam Irradiation

scholarly journals Elastocapillary interactions on nematic films

2015 ◽  
Vol 112 (20) ◽  
pp. 6336-6340 ◽  
Author(s):  
Iris B. Liu ◽  
Mohamed A. Gharbi ◽  
Victor L. Ngo ◽  
Randall D. Kamien ◽  
Shu Yang ◽  
...  
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Liquid Crystal ◽  
Easy Axis ◽  
Particle Migration ◽  
Fluid Interfaces ◽  
Particle Assembly ◽  
Director Field ◽  
Liquid Crystal Films ◽  
Crystal Films

Rod-like colloids distort fluid interfaces and interact by capillarity. We explore this interaction at the free surface of aligned nematic liquid crystal films. Naive comparison of capillary and elastic energies suggests that particle assembly would be determined solely by surface tension. Here, we demonstrate that, under certain circumstances, the capillary and elastic effects are complementary and each plays an important role. Particles assemble end-to-end, as dictated by capillarity, and align along the easy axis of the director field, as dictated by elasticity. On curved fluid interfaces, however, curvature capillary energies can overcome the elastic orientations and drive particle migration along curvature gradients. Domains of dominant interaction and their transition are investigated.

Attractive mode force microscopy of chiral liquid crystal surfaces

1992 ◽  
Vol 50 (1) ◽  
pp. 268-269
Author(s):  
B.D. Terris ◽  
R. J. Twieg ◽  
C. Nguyen ◽  
G. Sigaud ◽  
H. T. Nguyen
Keyword(s):  
Liquid Crystal ◽  
Crystal Surfaces ◽  
Free Surfaces ◽  
Control Range ◽  
Force Microscopy ◽  
Liquid Crystal Films ◽  
Chiral Liquid Crystal ◽  
Crystal Films ◽  
Electrostatic Charging ◽  
And Shifts

We have used a force microscope in the attractive, or noncontact, mode to image a variety of surfaces. In this mode, the microscope tip is oscillated near its resonant frequency and shifts in this frequency due to changes in the surface-tip force gradient are detected. We have used this technique in a variety of applications to polymers, including electrostatic charging, phase separation of ionomer surfaces, and crazing of glassy films.Most recently, we have applied the force microscope to imaging the free surfaces of chiral liquid crystal films. The compounds used (Table 1) have been chosen for their polymorphic variety of fluid mesophases, all of which exist within the temperature control range of our force microscope.

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