The review describes the status of studies and recent achievements in field photoalignment liquid crystals. An update classification photoaligning materials exposure schemes, analyzes relationship between molecular structure characteristics LC alignment are provided. In addition, bulk mediated combination with other methods discussed. Along traditional, recently proposed applications technique considered.

We report on random lasing in a disordered system which the multiple scattering feedback mechanism can be switched from three-dimensional walk to quasi-two-dimensional type of transport. The emission this is anisotropic, extraordinary polarized, and controlled via an external electric field. phenomenon observed dye-doped polymer dispersed liquid crystals makes use strong anisotropies these materials.

A plasmonic photopatterning technique is proposed and demonstrated for aligning the molecular orientation in liquid crystals (LCs) patterns with designer complexity. Using metamasks which target directors are encoded, LC alignments of arbitrary planar can be achieved a repeatable scalable fashion withunprecedentedly high spatial resolution throughput. As service to our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may...

Structural changes caused by the optically induced helical inversion in cholesteric liquid crystal cells with homeotropic anchoring are studied. In a one-step exposure, sequence of structural transformations "lying left-handed helix - unwound state lying right-handed helix" is realized. this process, smooth expansion helix, transition to an state, emergence and compression was observed. The maintained over rather wide range exposures. Well-oriented highly periodic fingerprint textures...

We describe a new aligning technique that yields uniform planar or tilted orientation of nematic liquid crystal at different organic and inorganic substrates. The method is based on the oblique irradiation an substrate with partially collimated flux accelerated plasma. sheet-like plasma produced by anode layer thruster race track geometry discharge channel. For crystals positive dielectric anisotropy produces two modes alignment: (1) easy axis in incident plane beam; (2) perpendicular to...

Abstract The irreversible electro-optical response (memory effect) of 'liquid crystal-aerosil' suspensions under the influence an electric field is investigated. Thereby, aerosil concentration on efficiency memory effect studied. experimental results are discussed in frame a model where filled nematic considered as system agglomerates liquid crystal matrix stabilized by forces orientational elasticity.

The article presents research results on carbonate system components of cooling water, which has previously undergone water treatment by liming, depends the cycle concentration and absorption carbon dioxide, simulate processes evaporation aeration in circulation systems (CCS) power plants. pH was an indicator chosen to identify given research. Were carried out experimental studies, control data were analyzed regarding component changes technological circulating CCS during liming according...

The electro-optical response and the microstructure of multiwalled carbon nanotubes dispersed in nematic liquid crystals with negative dielectric anisotropy are investigated. In contrast to undoped crystals, crystal dispersions characterized by irreversible electro-optic or so-called memory effect. This effect is that light transmittance through sandwiched layer dispersion placed between two crossed polarizers considerably increases after electric field application cycle. state persisted...

Via passivation of liquid crystal (LC) photoaligning layers by thin reactive mesogens, strong enhancement in LC alignment stability is achieved. Simultaneously, the improve uniformity and chemical widely change pretilt angle crystal.

In the present study, influence of diamond nanoparticles (DNPs) on dielectric properties nematic liquid crystal (LC) E7 from Merck has been considered. It is established that insertion DNPs leads to an increase in constant ε', as well a significant change electric conductivity σ LC. The growth ε' with concentration DNPs, CDNP, mainly caused by contribution DNP permittivity effective composite. character σ(CDNP) curves depends ionic purity LC E7: for samples based pure E7, detected, whereas...

Controlling and optimising the alignment of liquid crystals is a crucial process for display application. Here, we investigate effects humidity surface types on photoalignment an azo-dye brilliant yellow (BY). Specifically, effect BY was studied at stage substrate storage before coating, during spin-coating process, between film coating exposure, after exposure. Surprising results are drastic annealing to increase order layer exposure dry stabilise layer. Our interpreted in terms water...

Passivation of photoalignment films by continuous layers reactive mesogen provides stable liquid crystal alignment and electro-optic performance equivalent to that rubbed polyimide films.

Aligning liquid crystal (LC) molecules into spatially non-uniform orientation patterns is central to the functionalities of many emerging LC devices. Recently, we developed a new projection photopatterning technique by using plasmonic metamasks (PMMs), and demonstrated high-resolution high-throughput patterning molecular orientations arbitrary patterns. Here present comparisons between two different types metamask designs: one based on curvilinear nanoslits in metal films; other rectangular...

The structural peculiarities and electro-optic performance of liquid crystal (LC)-colloidal nanoparticle (NP)-polymer (P) composites formed by photoinduced phase separation are considered. We classify these materials under two groups according to limiting cases polymer morphology. first group corresponding small concentration comprises LCs filled with NPs that stabilized a network. It is found that, in addition the light scattering caused LC orientational defects, refractive index mismatch...

A pronounced irreversible electro-optical response (memory effect) has been recently observed for nematic liquid crystal (LC) EBBA doped by multi-walled carbon nanotubes (MWCNTs) near the percolation threshold of MWCNTs (0.02-0.05 wt. %). It is caused homeotropic-to-planar reorientation LC in an electric field. This feature explained electro-hydrodynamically stimulated dispergation and formation a MWCNT network which acts as spatially distributed surface stabilizing planar state LC....

Lasing in induced cholesteric liquid crystal (CLC) containing highly photosensitive azo chiral dopant (ChD) and pyrromethene laser dye was investigated. Due to the absence of excitation energy transfer from molecules ChD such a system, low lasing threshold achieved. When using violet green light-emitting diodes, reversible frequency tuning obtained range about 30 nm with time 1-2 orders magnitude smaller than conventional CLC systems based on azoxy compounds. Further increase intensity light...

We apply experimental technique based on the combination of methods dealing with principal refractive indices and absorption coefficients to study photoinduced three-dimensional (3D) orientational order in films liquid crystalline (LC) azopolymers. The is used identify 3D configurations trans azobenzene chromophores characterize degree ordering terms parameters. two types LC azopolymers which form structures preferred in-plane out-of-plane alignment azochromophores, respectively. Using...

Abstract Dielectric and electro-optical properties of nematic liquid crystals (LCs) doped with diamond nanoparticles (DNPs) have been investigated. It is established that the effect DNPs on electric conductivity depends purity LC; adsorb ions from LCs a substantial content ionic impurities, but release their own in highly pure LCs. The also influence LC permittivity due to orientational disordering contribution overall samples. In contrast LC-Carbon Nanotubes counterparts, LC-DNPs composites...

We report a strategy to assemble and manipulate nanoparticles arrays. The approach is based on the use of topological defects, namely disclination lines, created in chiral liquid crystals. control nanoparticle-loaded defects by low power light demonstrated. Large-scale rotation, translation deformation quantum dots light-emitting chains achieved homogeneous LED illumination. Full reconfigurability time stability make this attractive for future developments applications.