117 results about "Photoisomerization" patented technology

Fused ring bridge, ring locked dyes that form thermally stable photorfractive compositions. The fused ring bridge structures are pi -conjugated bonds in benzene-, naphthalene- or anthracene-derived fused ring systems that connect donor and acceptor groups. The donor and acceptor groups contribute to a high molecular dipole moment and linear polarizability anisotropy. The polarization characteristics of the dye molecules are stabilized since the bonds in the fused ring bridge are not susceptible to rotation, reducing the opportunity for photoisomerization. The dyes are compatible with polymeric compositions, including thermoplastics. The dyes are electrically neutral but have charge transport, electronic and orientational properties such that upon illumination of a composition containing the dye, the dye facilitates refractive index modulation and a photorefractive effect that can be utilized advantageously in numerous applications such as in optical quality devices and biological imaging.

A broad band cholesteric liquid crystal film of the present invention is a cholesteric liquid crystal film obtained by coating a liquid crystal mixture containing a polymerizable mesogen compound (a), a polymerizable chiral agent (b) and a photoisomerizable material (c) on a substrate to ultraviolet polymerize a coat of the liquid crystal mixture, and has a reflection bandwidth of 200 nm or more. A broad band cholesteric liquid crystal film of the present invention has a broad reflection band, is of a thin type and can be manufactured in less of manufacturing steps.

Electrodes carrying FAD-dependent enzymes on their surface are enclosed. The FAD is modified to include a functional group or moiety which affects the properties of the enzyme. The functional group or moiety can be a binding moiety through which the FAD-enzyme complex is immobilized onto the electrode; it can be an electron mediator group for transferring electrons between the electrode and the FAD; or it can be a photoisomerizable group which can undergo photoisomerization which yields a change in the rate of the electrically induced catalytic activity of the enzyme. The electrodes can be used in electrochemical systems for deforming analytes in liquid medium or for recordal of optical signals.

The invention discloses a cyano group-substituted stilbene-type liquid crystal material and its preparation technology and use. A liquid crystal fluorescent display utilizes the novel cyano group-substituted stilbene-type liquid crystal material. The cyano group-substituted stilbene-type liquid crystal material is a good liquid crystal material, has fluorescence radiation properties and can produce photoisomerization under ultraviolet irradiation. Fluorescent molecular dispersed liquid crystals are prepared by doping of the cyano group-substituted stilbene-type liquid crystal material and nematic liquid crystals, and the mixture is poured into a liquid crystal box. The mixture in the liquid crystal box produces photoisomerization under ultraviolet irradiation so that the cyano group-substituted stilbene-type liquid crystal material and the nematic liquid crystals produce phase separation. An AC voltage is applied to two ends of the liquid crystal box, and through power supply opening and closing, the dynamically reversible adjustable electrically-controlled liquid crystal fluorescent display is prepared. Based on the above properties, the electrically-controlled liquid crystal fluorescent display has a wide application prospect in the modern displaying and photoelectric field.

The invention provides an azobenzene polymer material which has a structure represented by formula I shown in the description. The azobenzene polymer can be isomerized under photoinduction, can be changed in glass-transition temperature, can produce a reversible solid-liquid transition at room temperature, and has and has repeatable self-repairing and surface repairing effects. Meanwhile, a trans-azobenzene polymer is solid, has strong adhesion and can bear loads. In contrast, a cis-azobenzene polymer is liquid and has weak adhesion, which means photoisomerization can cause load drop. Therefore, the azobenzene polymer provided by the invention can be used as a photoresponsive self-repairing material and a light-controlled reversible adhesive, and can solve problems a conventional thermoplastic polymer material in plastics, remodeling and damage repair of a coating, separation, recycling and adhesive surface repair of an adhesive and the like.

The present invention relates to a liquid crystal display device including a pair of a substrate arranged opposite to each other, an electrode group disposed on one side or both sides of the pair of substrates facing each other, a plurality of active devices connected to the electrode group, a liquid crystal alignment film disposed on each facing side of the pair of substrates, and a liquid crystal layer interposed between the pair of substrates, wherein the liquid crystal alignment film is manufactured by irradiating linearly polarized light to a film obtained from polyamic acid or a derivative thereof having a photoisomerization structure in the main chain or a film being subject to heat-baking so as to provide alignment-controlling capability, and the liquid crystal layer is a liquid crystal composition having negative (−) dielectric anisotropy. By the present invention, a liquid crystal display device having improved image sticking characteristics and good alignment stability is provided.

The invention relates to a method for preparing a light-controlled solid-liquid transformed azo polymer, and belongs to the field of polymer functional materials. The azo polymer is prepared by azobenzene acrylate and polyamidoamine (PAMAM) dendrimer through michael addition reaction. The azobenzene in the azo polymer has reversible trans-cis photoisomerization properties. The azo polymer can realize reversible solid-liquid phase transformation under light control, specifically, azobenzene changes from a trans structure to a cis structure under ultraviolet light irradiation, and the azo polymer changes from a solid state to a liquid state; and the azobenzene under visible light irradiation transforms from the cis structure to the trans structure, and the azo polymer changes from a liquid state to a solid state. The method provides a new strategy for developing novel light-induced solid-liquid transformed materials, light-induced phase change heat storage and molecular photothermal storage materials.

Disclosed is a photoisomerization reflecting mirror system. Azobenzene derivative composite films having photoisomerization features are adopted as materials of a reflecting mirror, and the surface shape of the film mirror is adjusted through the mode that the irradiation direction, time and power of polarized light to the film mirror are controlled to satisfy imaging precision requirements of an optical system. The photoisomerization reflecting mirror system mainly comprises a film reflecting mirror assembly, a reflecting mirror assembly supporting structure, a scanning device, a polarization and energy control device, a beam expansion device and a laser device; laser emitted by the laser device can be converted to light beams satisfying system control requirements through the beam expansion device and the polarization and energy control device; the scanning device adjusts the directions of the light beams, irradiates appointed regions and adjusts the surface shape of the reflecting mirror through the photoisomerization features of the materials. The photoisomerization reflecting mirror system has the advantages of being light and controllable in surface shape precision, and can be made into a large-diameter reflecting mirror, be applied to space remote sensors, reduce weights of the remote sensors and save the development cost of the remote sensors.

An optical device for a display panel. The optical device comprises an optical element (1). The optical element (1) may include a first surface (3) and a second surface (4) opposite the first surface, and side surfaces. The optical device may further comprise a light source (2) facing one of the side surfaces of the optical element (1). The optical element (1) may comprise a compound containing a photoisomer group. The photoisomer group may undergo a photoisomerization under an irradiation of the light source. Accordingly, an illumination area by a light passing through the first surface (3) and exiting from the second surface (4) may increase or decrease.

Provided are a liquid crystal orientation film with which it is possible to alleviate an afterimage resulting from AC driving which occurs with an IPS drive format or an FFS drive format liquid-crystal display element, and a liquid crystal orientation liquid for a light orientation processing technique for said film. A liquid crystal orientation liquid for a light orientation processing technique includes a constituent (A), a constituent (B), and an organic solvent, wherein the degree of inclusion of the constituent (B) is 0.1-15 parts to 100 parts of the constituent (A). Constituent (A): one or more polymers, wherein by illuminating with polarized light, one of the following reactions progresses: photolysis, photodimerization, or photoisomerization, and wherein an anisotropy is applied in either the same direction as the polarized light direction or the perpendicular direction to the polarized light direction. Constituent (B): a polymer having a structure which is represented with formula (1), following: (Chemical Formula 1) (Wherein W1 and W2 are independent bivalent organic groups including an aromatic group with 6-30 carbons, and A is a bivalent organic group including an alkylene group with 2-20 carbons.

The present invention is directed to a film forming, photoactive, homogeneously mixed material comprising a complex prepared from (a) at least one ionic photosensitive compound which may undergo a photoreaction, selected from photoisomerizations, photocycloadditions and photoinduced rearrangements, and/or (a′) at least one photosensitive polyelectrolyte (“second polyelectrolyte”) carrying residues which may undergo said photoreaction, and (b) at least one (“first”) polyelectrolyte carrying charges which are opposite to those of the active groups of the photosensitive material. This material has unique photochemical properties in that non-scattering, optically clear films may prepared therefrom which allow light-induced generation of optical anisotropy and of topological surface structures, e.g. such as surface relief gratings (SRG).

The invention provides a photochromic hyperbranched azopolyamide and a preparation method thereof. The method includes: taking 4, 4'-azodianiline and trimesic acid as the raw materials, firstly converting trimesic acid into trimesoyl chloride, and then utilizing the reaction activity of acyl chloride group and amino to synthesize hyperbranched azopolyamide by low temperature solution polycondensation. The photochromic hyperbranched azopolyamide has the optical activity of azo group, and also has good thermodynamic stability and excellent processability of polyamide substances, and a UV-Vis spectrum is employed to study the photoisomerization characteristics and photo-trans-cis isomerization kinetics of the synthesized azo polymer.

The present invention provides a method for manufacturing a liquid crystal display device including a photo-alignment film and capable of sufficiently improving the display quality. The method for manufacturing a liquid crystal display device of the present invention is a method for manufacturing a liquid crystal display device including a photo-alignment film. The method for manufacturing a liquid crystal display device successively includes a step (1) of forming on a substrate a film from a photo-alignment-film material that contains a solvent and a polymer including a photo-functional group that is capable of causing at least one chemical reaction selected from the group consisting of photodimerization, photoisomerization, and photo-Fries rearrangement; a step (2) of pre-heating the film to evaporate the solvent; a step (3) of irradiating the pre-heated film with polarized light; and a step (4) including an operation of main-heating the polarized-light-irradiated film at multiple temperatures from a lower temperature to a higher temperature. The liquid crystal display device is of an in-plane switching mode or a fringe field switching mode in each of which a pre-tilt angle is substantially 0°.

Disclosed is light-driven actuator element characterized in that, inter alia, it can be reduced to micrometer size, is rapidly responsive, and reversibly changes to enable repeated use. The light-driven actuator element includes a crystal of diarylethene compound which changes shape upon photoisomerization (e.g., the compound of Structural Formula (I) below, where R¹ represents a hydrogen atom or methyl group and R² represents a methyl group). The element can be a rod-shaped or plate-like microcrystal having a size on the order of micrometer. The element bends (or contracts) on irradiation with ultraviolet light and expands to return to the original size on irradiation with visible light.

A novel photochromic liquid crystal comprising a diarylethene compound having both photochromic properties and liquid crystallinity. This compound is a photochromic diarylethene compound having a mesogen group in each of the two aryl groups. The photochromic liquid crystal provides a large change in birefringence by photoisomerization or phase transition, and has high durability against repeated changes in birefringence. A side-chain polymer liquid crystal containing the above photochromic liquid crystal is useful as an optical recording material. Such an optical recording material is capable of performing light modulation by irradiation with light near Tc thereof, and is applicable to photo operator devices, optical memories, and the like. Further, the optical recording material is useful as a material for a recording layer of an optical recording medium such as an optical disk or an optical memory card.

The invention discloses a preparation method of a light-responsive PEGylated gene delivery system based on host-guest assembly. Its steps are as follows: 1) Using N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid buffer solution, prepare polyethyleneimine grafted cyclodextrin solution with a concentration of 0.1-1 mg/mL and a concentration of 0.4-2 mg/mL azobenzene-modified polyethylene glycol solution; 2) Use the buffer solution in step 1) to prepare a DNA solution with a concentration of 50-500 μg/mL; 3) Mix the two solutions in step 1) and polymerize The molar ratio of cyclodextrin and azobenzene-modified polyethylene glycol contained in ethyleneimine-grafted cyclodextrin is 1:1-1:4, and the supramolecular compound solution is obtained after ultrasonication for 15 minutes and standing for 1 hour; 4) Add the solution prepared in step 3) to an equal volume of the solution in step 2), vortex to mix and let stand. The invention can improve its stability in physiological saline solution. Through the photoisomerization of azobenzene, the detachment of the PEG shell of the intracellular gene delivery system can be achieved, which can effectively improve the efficiency of gene transfection.

The invention relates to a method for synthesizing 9beta,10alpha-dehydroprogesterone ketal through photochemical isomerization in a micro-channel reactor. The method comprises the following steps: dissolving a raw material, namely 9alpha,10beta-dehydroprogesterone ketal in a medium polar solvent to prepare a solution with the concentration of 10-50 g/ml, adding an antioxidant and organic alkali into the solution, and carrying out uniform stirring and mixing to prepare a photochemical reaction solution; and introducing nitrogen is into the obtained photochemical reaction solution for protection, and conducting illumination three times so as to realize photoisomerization of 9alpha,10 beta-dehydroprogesterone ketal. According to the invention, reaction time is greatly shortened, generation ofphotoisomerization reaction by-products is inhibited, conversion rate is high, and the method is suitable for industrial production.

A photoactive polymer of the general formula I:in which:P is a photoactive group which can photoisomerise and/or photodimerise;B represents an aromatic or alicyclic group, or B further represents a nitrogen atom or -CR<2>-;A, C, D each independently of the other represents an aromatic or alicyclic group;M represents a repeating monomer unit in a homo- or copolymer;S<1>, S<2>, S<3>, S<4>, S<5 >represent a single covalent bond or a spacer unit;n<1>, n<2 >are each independently a positive integer up to 2 with the proviso that n<1>+n<2><=2;R<1 >is a hydrogen atom, or a straight-chain or branched alkyl residue wherein R<2 >represents a hydrogen atom or lower alkyl.The photoactive polymers may be used as orientation layers for liquid crystals and in the construction of unstructured and structured optical elements and multi-layer systems.

The present invention provides a method for manufacturing a liquid crystal display device including a photo-alignment film and capable of sufficiently improving the display quality. The method for manufacturing a liquid crystal display device of the present invention is a method for manufacturing a liquid crystal display device including a photo-alignment film. The method for manufacturing a liquid crystal display device successively includes a step (1) of forming on a substrate a film from a photo-alignment-film material that contains a solvent, a polymer including a photo-functional group that is capable of causing at least one chemical reaction selected from the group consisting of photodimerization, photoisomerization, and photo-Fries rearrangement, and a polymer including a polyamic acid backbone and free from the photo-functional group; a step (2) of pre-heating the film to evaporate the solvent; a step (3) of irradiating the pre-heated film with polarized light; and a step (4) of main-heating the polarized-light-irradiated film. The liquid crystal display device is of an in-plane switching mode or a fringe field switching mode in each of which a pre-tilt angle is substantially 0°.