Director configurations in nematic droplets with tilted surface anchoring

Abstract

The polymer dispersed nematic liquid crystal with the tilted surface anchoring has been studied. The droplet orientational structures with two point surface defects-boojums and the surface ring defect are formed within the films. The director tilt angle  = 40  4 at the droplet interface and LC surface anchoring strength Ws ~ 10 -6 (J m -2 ) have been estimated. The bipolar axes within the studied droplets of oblate ellipsoidal form can be randomly oriented are oriented randomly relatively to the ellipsoid axes as opposed to the droplets with homeotropic and tangential anchoring.

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

“…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].…”

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

“…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.…”

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

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

“…[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.…”

“…We have examined experimentally the PDLC film based on the nematic mixture LN-396 (Belarus State Technological University) and poly(isobutyl methacrylate) (PiBMA) (Sigma), assigning the CBC in this mixture with the tilt angle of director to the surface normal is θ = 40 • ± 4 • [34]. The weight ratio of LN-396 to PiBMA was 60 : 40.…”