Director configurations in nematic droplets with tilted surface anchoring

Krakhalev, M. N.; Prishchepa, O. O.; Sutormin, V. S.; Zyryanov, V. Ya.

doi:10.1080/02678292.2016.1205225

Cited by 21 publications

(29 citation statements)

References 29 publications

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“…In this case, the axisymmetric (C ∞ ) double twisted structure (N 0 < 2) or the defect-free structure with the uniform helix axis distribution (N 0 > 2) have been observed in cholesteric droplets [43][44][45][46]. Recently, we have obtained and investigated the nematic droplets dispersed in polymer with the conical boundary conditions [47]. Several orientational structures differing by the type and relative arrangement of surface and bulk topological defects are formed in such droplets [12].…”

Section: Introductionmentioning

confidence: 99%

Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions

2020

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Cholesteric droplets dispersed in polymer with conical boundary conditions have been studied. The director configurations are identified by the polarising microscopy technique. The axisymmetric twisted axial-bipolar configuration with the surface circular defect at the droplet’s equator is formed at the relative chirality parameter N 0 ≤ 2.9 . The intermediate director configuration with the deformed circular defect is realised at 2.9 < N 0 < 3.95 , and the layer-like structure with the twisted surface defect loop is observed at N 0 ≥ 3.95 . The cholesteric layers in the layer-like structure are slightly distorted although the cholesteric helix is untwisted.

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Section: Introductionmentioning

confidence: 99%

Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions

2020

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“…Orientational controls and alignments of liquid crystals (LCs) have shown an intense impact on multipurpose display applications and polarization‐sensitive optical switches . The key alignments of LCs are homogeneous, homeotropic, and hybrid, which are being utilized for various electrooptic (EO) applications of LC in order to execute the purpose.…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

Sharma

Kumar

Chinky

et al. 2019

J of Applied Polymer Sci

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Reported herein, the preparation, morphological, and electrooptic (EO) characterization of reverse mode polymer dispersed liquid crystals (PDLCs) with nematic liquid crystal (LC) and UV curable polymer optical adhesive using polymerization induced phase separation method. The PDLCs are switchable between transparent and opaque states due to the homeotropic and planar alignment of LC in their OFF and ON states of applied voltage, respectively. Further, effect of doping of a fixed concentration of azo dye and silica nanoparticles (NPs) on morphological, EO and response characteristics of same PDLC sample was also analyzed. Experimental results showed that doped reverse mode PDLCs have the higher OFF state optical transmission and boost up in the scattering ON state compared with pristine reverse mode PDLC. The phenomenon is also supported by extinction coefficient and absorption study based on Beer's law. The threshold and operating voltages were found reduced ~1.56 and ~1.73 times for NPs and (NPs + dye) doped reverse mode PDLCs, respectively, along with better contrasts to the pristine reverse mode PDLC. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48745.

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“…1, d) can occur. PDLC films with conical boundary conditions at the interface have been obtained [34] recently.…”

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confidence: 99%

“…[35]). We used θ 0 = 90 • for PBC case and θ 0 = 40 • for CBC case, according to [34]. We produced numerical modeling of the oblate PDLC droplets filled with nematic 5CB with the ratio between long dx = dy and short dz eigenvectors fixed dx/dz = 2.…”

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Electrically induced structure transition in nematic liquid crystal droplets with conical boundary conditions

et al. 2017

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Polymer-dispersed liquid crystal composites have been a focus of study for a long time for their unique electro-optical properties and manufacturing by "bottom-up" techniques at large scales. In this paper, nematic liquid crystal oblate droplets with conical boundary conditions (CBCs) under the action of electric field were studied by computer simulations and polarized optical microscopy. Droplets with CBCs were shown to prefer an axial-bipolar structure, which combines a pair of boojums and circular disclinations on a surface. In contrast to droplets with degenerate planar boundary conditions (PBCs), hybridization of the two structure types in droplets with CBCs leads to a two-minima energy profile, resulting in an abrupt structure transition and bistable behavior of the system. The nature of the low-energy barrier in droplets with CBCs makes it highly sensitive to external stimuli, such as electric or magnetic fields, temperature, and light. In particular, the value of the electric field of the structure reorientation in droplets with CBCs was found to be a few times smaller than the one for droplets with PBCs, and the droplet state remained stable after switching off the voltage.

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Director configurations in nematic droplets with tilted surface anchoring

Cited by 21 publications

References 29 publications

Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions

Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions

Preparation and electrooptic study of reverse mode polymer dispersed liquid crystal: Performance augmentation with the doping of nanoparticles and dichroic dye

Electrically induced structure transition in nematic liquid crystal droplets with conical boundary conditions

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