Rheology in Complex Fluids 1

2019 ◽  
pp. 212-247
Author(s):  
Troy Shinbrot
Keyword(s):  
Liquid Crystal ◽  
Synovial Fluid ◽  
Yield Stress ◽  
Complex Fluids ◽  
Shear Thickening ◽  
Lubrication Approximation ◽  
Complex Flows ◽  
Dense Suspensions ◽  
Crystal Alignment ◽  
Model Equations

Complex flows are described, including shear thinning, shear thickening, and yield-stress. Mechanisms of changing viscosity in dense suspensions are explored, including the relevance of the lubrication approximation, dilatency, and the spaghetti model of polymers. Liquid crystal alignment is discussed, and model equations are introduced for flows in packed beds. The viscosity of synovial fluid is described, and equations to combine viscous and elastic behaviors are obtained.

Bistable liquid crystal device fabricated via microscale liquid crystal alignment

2016 ◽  
Vol 120 (14) ◽  
pp. 143105 ◽  
Author(s):  
Michinori Honma ◽  
Wataru Toyoshima ◽  
Toshiaki Nose
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Device ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment

scholarly journals Viscous-like forces control the impact response of shear-thickening dense suspensions

2021 ◽  
Vol 923 ◽  
Author(s):  
Marc-Andre Brassard ◽  
Neil Causley ◽  
Nasser Krizou ◽  
Joshua A. Dijksman ◽  
Abram. H. Clark
Keyword(s):  
Shear Thickening ◽  
Impact Response ◽  
Dense Suspensions ◽  
The Impact

Abstract

Soft imprint lithography for liquid crystal alignment using a wrinkled UVO-treated PDMS transferring method

2021 ◽  
Vol 323 ◽  
pp. 115150
Author(s):  
Jung-Hyun Hwang ◽  
Jae-Sung Hong ◽  
Chan-Woo Oh ◽  
Min-Je Joe ◽  
Hae-Chang Jeong ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Imprint Lithography ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment

scholarly journals Photocontrollable Resistivity Change in Nanoparticle-Doped Liquid Crystal Alignment Layer: Voltage Holding and Discharging Properties of Fringe-Field Switching Liquid Crystal Modes

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 268
Author(s):  
Jeong-Hoon Ko ◽  
Jun-Chan Choi ◽  
Dong-Jin Lee ◽  
Jae-Won Lee ◽  
Hak-Rin Kim
Keyword(s):  
Liquid Crystal ◽  
Power Saving ◽  
Low Frequency ◽  
Fringe Field ◽  
Resistance Level ◽  
Alignment Layer ◽  
Experimental Scheme ◽  
Tunable Range ◽  
Crystal Alignment ◽  
Operation Frequency

In liquid crystal (LC) displays, deriving an optimum resistance level of an LC alignment polyimide (PI) layer is important because of the trade-off between the voltage holding and surface-discharging properties. In particular, to apply a power-saving low-frequency operation scheme to fringe-field switching (FFS) LC modes with negative dielectric LC (n-LC), delicate material engineering is required to avoid surface-charge-dependent image flickering and sticking problems, which severely degrade with lowering operation frequency. Therefore, this paper proposes a photocontrolled variable-resistivity PI layer in order to systematically investigate the voltage holding and discharging properties of the FFS n-LC modes, according to the PI resistivity (ρ) levels. By doping fullerene into the high-ρ PI as the photoexcited charge-generating nanoparticles, the ρ levels of the PI were continuously controllable with a wide tunable range (0.95 × 1015 Ω∙cm to 5.36 × 1013 Ω∙cm) through Ar laser irradiation under the same LC and LC alignment conditions. The frequency-dependent voltage holding and discharge behaviors were analyzed with photocontrolled ρ variation. Thus, the proposed experimental scheme is a feasible approach in PI engineering for a power-saving low-frequency FFS n-LC mode without the image flickering and image sticking issues.

A Novel Patterning Method of Liquid Crystal Alignment by Azimuthal Anchoring Control

2002 ◽  
Vol 41 (Part 2, No. 8A) ◽  
pp. L889-L891 ◽  
Author(s):  
Rumiko Yamaguchi ◽  
Yusuke Goto ◽  
Susumu Sato
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment

Liquid crystal alignment using naphthalocyanine Langmuir-Blodgett films

1997 ◽  
Vol 231 (3-4) ◽  
pp. 289-293 ◽  
Author(s):  
Ruibo Lu ◽  
Keshu Xu ◽  
Juhua Zhong ◽  
Zhaokui Zhang ◽  
Haiming Wu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Langmuir Blodgett ◽  
Liquid Crystal Alignment ◽  
Langmuir Blodgett Films ◽  
Crystal Alignment
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