76 results about "Photoisomerization" patented technology

A liquid crystal optical element includes an optical function layer and two transparent substrates. The optical function layer is sandwiched between two transparent substrates. The optical function layer contains liquid crystal molecules and a photoisomerization material. The liquid crystal optical element switches between a light-transmitting state and a light-scattering state according to an orientation state of the liquid crystal molecules. The optical function layer holds the liquid crystal molecules and the photoisomerization material within a mesh structure formed of a resin-particle aggregate. Therefore, light can be strongly scattered when the liquid crystal optical element is in a screen state, and a high-contrast image is obtained when visible light is projected onto the liquid crystal optical element.

The invention relates to the technical field of biological materials, in particular to a pillararene-based photoresponse MOF-based ion gating nanochannel and a preparation method thereof. According to the pillararene-based photoresponse MOF-based ion gating nano-channel, a bullet-shaped nano-channel is prepared by taking PET (Polyethylene Terephthalate) as a substrate, and the substrate can provide structural support; p5A-MOF-1 based on pillararene is used as a core functional layer, and the core functional layer can provide a stable cavity environment; a P5A-MOF-1 cavity is filled with an organic aromatic azo compound, so that the light response structure change is realized. And the effective volume of the P5A-MOF-1 cavity is regulated and controlled through the photoisomerization effect of the azo group, so that precise gating of ion transmission is achieved. The preparation method provided by the invention is simple and convenient to operate, mild and controllable in condition and beneficial to large-scale production.

This invention provides a highly thermally stable, photoresponsive α-diimine nickel complex, its synthesis method, and its applications, aiming to develop novel olefin polymerization catalysts with both excellent thermal stability and photoresponsive properties. The core photoresponsive switch of this type of nickel complex is a rigid diphenylethylene derivative, which can achieve reversible photoisomerization of the E / Z configuration under 365 nm and 405 nm ultraviolet light irradiation: the E configuration has a relatively open coordination environment; after light irradiation, the Z configuration has a more compact spatial structure, which can form a dual regulatory mechanism: steric hindrance and potential metal-aryl π interactions. Due to this dual regulatory mechanism, the complex exhibits excellent thermal stability at 150 °C. o Even at high temperatures, it still maintains a high value of 0.8 × 10⁻⁶. 6 g·mol ‑1 ·h ‑1 The nickel complex of this invention exhibits enhanced catalytic activity and effectively inhibits chain transfer and chain walking reactions during high-temperature polymerization. By synergistically enhancing thermal stability through configurational tautomerism, and possessing both photoresponsive properties and high catalytic activity, it holds significant research value and broad application prospects in the precise synthesis of functionalized polyolefin materials.

A liquid crystal optical element includes an optical function layer and two transparent substrates. The optical function layer is sandwiched between two transparent substrates. The optical function layer contains liquid crystal molecules and a photoisomerization material. The liquid crystal optical element switches between a light-transmitting state and a light-scattering state according to an orientation state of the liquid crystal molecules. The optical function layer holds the liquid crystal molecules and the photoisomerization material within a mesh structure formed of a resin-particle aggregate. Therefore, light can be strongly scattered when the liquid crystal optical element is in a screen state, and a high-contrast image is obtained when visible light is projected onto the liquid crystal optical element.

The invention discloses a series of photoinduced isocompounds based on an alpha-cyano diarylethene skeleton as well as a preparation method and a metal ion regulation mechanism of the photoinduced isocompounds. The photoinduced isomeric compound is prepared through Knoevenagel condensation reaction by taking alpha-cyano diarylethene as a basic skeleton structure, the structural general formula of the photoinduced isomeric compound is shown in the specification, and the photoinduced isomeric compound is named as a hydroxyl-containing alpha-cyano diarylethene aromatic derivative. The photoinduced isomerization compound disclosed by the invention has good polarity sensitivity and photoinduced isomerization capability, and Z / E isomerization can be realized under the irradiation of ultraviolet light. The addition of metal ions is not a fluorescent response trigger factor, but can effectively adjust the photoresponse degree and rate of the photoinduced isocompound. The synthesis method of the photoisomerization compound is simple, the product is easy to purify, the optical property caused by photoisomerization can be regulated and controlled through coordination of polarity and metal ions, and an effective strategy is provided for designing a high-performance optical function material and application thereof.

The invention relates to the technical field of novel functional materials, in particular to an imine compound, a preparation method of the imine compound, a composite material and a preparation method of the composite material. The imine compound disclosed by the invention can generate reversible photoisomerization response through proton transfer and bond rotation in molecules of the imine compound; and the imine compound mainly exists in a molecular crystal state, so that the angle change between two naphthalene rings in a molecule caused by bond rotation can cause lattice deformation and further cause deformation of the whole molecular crystal, and therefore, the imine compound can show reversible photoisomerization response under visible light irradiation. According to the imine compound, when visible light illumination is given to the molecular crystal of the imine compound, photoinduced volume shrinkage and expansion can occur, the imine compound has strong light isomerization response under visible light, the functionality and application scene of the imine compound can be effectively expanded, and meanwhile the variety of photoisomerization materials can be enriched.

An anti-tamper module includes a substrate and a photoisomerization (PI) layer formed on the substrate. The PI layer comprises molecules configured to transition from a first state to a second state in response to exposure to a first type of light and transition from the second state to the first state in response to exposure to a second type of light, and transitioning a selected portion of the PI layer to the first state while surrounding portions of the PI layer remain in the second state causes physical deformation of the PI layer. An excitonic layer is arranged on the PI layer. An electrical characteristic of the excitonic layer is sensitive to strain caused by the physical deformation of the PI layer such that an excitonic property of the excitonic layer changes in a region corresponding to the selected portion of the PI layer.

The invention belongs to the field of new materials, and particularly relates to a benzoxazine phenoxazine modified dithienyl ethylene derivative as well as a preparation method and application of the benzoxazine phenoxazine modified dithienyl ethylene derivative. The invention provides a full visible light regulated benzoxazine phenoxazine conjugate modified dithienyl ethylene molecular switch, the photochromic degree of the molecular switch is the same as the effect under ultraviolet irradiation when the molecular switch drives a ring-closing reaction through visible light, and the molecular switch has high visible light responsiveness and light isomerization conversion rate.

The invention discloses a photoisomerization method of carotenoid, which comprises the following steps: dispersing high cis carotenoid in an organic solvent, carrying out photoisomerization in an illumination kettle until the proportion of all-trans carotenoid is not obviously increased, cooling, crystallizing, and filtering to obtain carotenoid solid with high all-trans proportion, and the filtrate sleeve is used as a solvent for next batch of isomerization. The isomerization method has the characteristics of mild conditions, high efficiency, controllability, cleanness and the like, accords with green chemistry and sustainable development concepts, and is simple in isomerization extraction operation, high in extraction yield and suitable for large-scale implementation.

The invention discloses a nano-drug with hypoxia responsiveness and a photoisomerization function as well as preparation and application thereof, and belongs to the technical field of biological medicines. The 4, 4 '-diacyl chloride azobenzene is used as a low-oxygen response unit and is covalently linked with the 10-hydroxycamptothecine and the drug carrier mPEG to form the size-controllable nano-drug, and the nano-drug has a proper particle size, is more beneficial to enrichment and curative effect exertion of the drug at a tumor site through blood circulation, and has a good application prospect. When the nano-drug reaches a hypoxia tumor site, the azo group in the nano-drug is reduced by the special azo reductase in a hypoxia environment, so that the structure of the nano-drug is disintegrated, the 10-hydroxycamptothecine is released to play a role in chemotherapy, and the toxic and side effects of the drug on normal tissues are reduced; besides, the nano-drug is high in utilization rate and has better biocompatibility, so that the nano-drug has a better application prospect in preparation of antitumor drugs.

The invention belongs to the technical field of organic electronics, and discloses a preparation method of an indanone-based photoresponse organic molecule and application of the indanone-based photoresponse organic molecule in the field of organic single-molecule wires. The indanone-based photo-responsive organic molecule has a structure shown as I-II as shown in the specification, and through-bond coupling (TBC) and through-space coupling (TSC) channels of the indanone-based photo-responsive organic molecule can be regulated and controlled through molecular structure engineering. By means of introducing electron donating / withdrawing groups into molecules, adjusting the length of a pi-conjugated chain, introducing steric hindrance and the like, the molecules are subjected to reversible photoisomerization under ultraviolet irradiation, and meanwhile, adjustment of a charge transfer channel can be realized at a single molecule level. The preparation method is simple and applicable, and has a good application prospect in the field of organic monomolecular wires.

The application relates to an electrowetting pixel unit, a display panel and a control method, the electrowetting pixel unit comprising a first cavity, the first cavity being filled with an electrolyte solution and translucent ink; a transparent insulating layer having a hollow second cavity, the second cavity being filled with a photoisomerization particle solution; the photoisomerization particle solution can change color under irradiation of light of a preset wavelength, and the translucent ink can prevent light of the preset wavelength in an external light source from passing through when spreading on a hydrophobic film layer. The electrowetting pixel unit provided by the application is filled with the photoisomerization particle solution in the second cavity, the photoisomerization particle itself has color, and can change color under irradiation of light of a preset wavelength, so that the richness of color display can be improved, the translucent ink can prevent light of the preset wavelength in an external light source from passing through when spreading on the hydrophobic film layer, and the reliability of the electrowetting pixel unit in improving the richness of color display through the photoisomerization particle solution can be ensured.

The invention relates to a synthetic method of didrogesterone. According to the method, progesterone is subjected to ketalation, halogenation, elimination, illumination isomerization, deprotection and final isomerization, and the didrogesterone is obtained. The method has the advantages of high yield, cheap and easily available raw materials, green and safe whole process route, high bulk drug quality and purity of 99.8% or more, and is suitable for industrial production.

The invention belongs to the technical field of solar-blind ultraviolet light detection materials, and relates to a full-flexible solar-blind ultraviolet light detection material and a preparation method and application thereof, and the full-flexible solar-blind ultraviolet light detection material comprises a down-conversion luminescent material, an azobenzene polymer and a piezoelectric polymer. The excitation-emission characteristic of the rare earth doped down-conversion particles is utilized, a light absorption window of azobenzene elements and the wavelength conversion characteristic of the down-conversion light-emitting particles are accurately matched, high-energy solar-blind ultraviolet light is converted into low-energy long-wave ultraviolet light capable of enabling azobenzene molecules to generate photoisomerization, an azobenzene polymer is driven to generate photoisomerization, and the light-emitting efficiency of the azobenzene polymer is improved. The film fiber network is driven to microscopically shrink and the piezoelectric polymer is excited to output an electric signal; the operation is simple and convenient, the fiber film composite material with a microstructure can be continuously manufactured in a large area, and the preparation of the large-area, fast-response and high-stability intrinsic flexible solar-blind ultraviolet detection material and the device thereof is realized.

The invention belongs to the technical field of porous carbon materials, and relates to a preparation method of pore dynamic adjustable porous carbon based on photoisomerization, which comprises the following steps: (S1) dissolving thermoplastic phenolic resin, an azobenzene derivative containing acyl chloride and a photoinitiator in a solvent inert to acyl chloride, then adding an acid-binding agent, and reacting at 40-60 DEG C; after the reaction is finished, adding a catalyst to obtain a precursor solution; (S2) forming a film from the precursor solution through a spin-coating method to obtain a film I; (S3) sequentially carrying out ultraviolet light irradiation and visible light irradiation on the film I in an inert atmosphere to trigger a photoisomerization reaction, so as to obtain a film II; and (S4) sequentially carrying out thermocuring, pre-oxidation and carbonization on the film II to obtain the porous carbon. According to the method, conventional physical activation and chemical activation processes are omitted, use of corrosive reagents such as strong acid and strong alkali is avoided, and preparation of the environment-friendly porous carbon with dynamically adjustable pores is realized.

The invention discloses a DASAs molecular optical switch capable of realizing solid film isomerization and a synthesis method and application thereof. The DASAs molecular optical switch is 5-((2Z, 4E)-5-(benzyl ((4-methylpyridine-2-yl) methyl) amino)-2-hydroxypent-2, 4-diene-1-subunit)-2, 2-dimethyl-1, 3-dioxane-4, 6-diketone, 4-methylpyridine-2-formaldehyde reacts with benzylamine, then N-benzyl-1-(4-methylpyridine-2-yl) methylamine is synthesized through reduction of sodium borohydride, and then the DASAs molecular optical switch is obtained. The preparation method comprises the following steps: reacting 2, 3-dimethoxy-1, 3-dioxane-4, 6-diketone in methanol, and reacting with 5-(furan-2-yl methylene)-2, 2-dimethyl-1, 3-dioxane-4, 6-diketone in methanol to synthesize the compound. The DASAs molecular photoswitch disclosed by the invention has rapid and reversible isomerization response to visible light and shows remarkable selective color response to metal ions, and in addition, the molecular photoswitch can realize reversible photochromism in a solid state in a polymer substrate. More importantly, the pure-phase solid film prepared by the molecular optical switch can realize photoisomerization, and has huge application potential in the fields of optical information storage and information permanent encryption, metal ion detectors and the like.

The application provides a kind of light regulated liquid crystal material composition and its preparation method, belongs to light regulated liquid crystal technical field, preparation method includes with docosyl-tetramethyl piperidinol propylene acid ester, (3-acryloyloxy-2-hydroxy propoxy propyl) end-capped polydimethylsiloxane, cyano biphenyl hexyl acrylate and other raw materials preparation adjuvant, nematic liquid crystal monomer, photoisomerization functional monomer, dynamic covalent crosslinking agent, photoinitiator and the mixed liquid consisting of cyclohexanone and propylene glycol methyl ether acetate are under the condition of controlled temperature, rotation speed and vacuum degree, low-speed stirring, high-speed shearing dispersion and vacuum degassing curing are carried out, to obtain light regulated liquid crystal material composition, the application is through the adjuvant design and the one-step method mixing process of simplification, the contradiction between material dynamic response performance and long-term stability is solved, the prepared composition shows millisecond level fast light response, high optical contrast, photo-induced deformation and good cycle durability after film curing.

The invention relates to the technical field of compound synthesis, in particular to (Z)-p-toluenesulfonyl hydrazone derivatives and a preparation method thereof. The (E)-p-toluenesulfonyl hydrazone derivative, a photosensitizer and a solvent are mixed and react under illumination to obtain the (Z)-p-toluenesulfonyl hydrazone derivative. The photosensitizer selected by the method is green and low in cost, free of heavy metal residues, wide in substrate application range, high in isomerization efficiency, short in reaction time and good in cis-product stability, the system is easy for amplified production, the high-purity hydrazone compound and the photoisomerization product thereof can be efficiently, mildly and greenly prepared, and the method is suitable for industrial production. The application potential in the fields of drug synthesis, precise drug delivery and functional materials is obviously improved.

The application belongs to the technical field of fluorescent analysis and detection, and particularly relates to a tridentate Schiff base compound and a preparation method and application thereof. 2 The formylhydrazine Schiff base compound is widely applied in coordination chemistry, and a parent structure thereof can be used to better study the transformation of a complex under light stimulation, and the imino group also has good photoisomerization performance, at this time, the light stimulation can catalyze the ligand to produce more rich coordination modes, so the isomerization phenomenon of the compound under the action of ultraviolet light is tested, and the application of the compound in a colorimetric chemical sensor is studied. Further research is conducted on whether the compound has different ion selectivity after the conversion configuration under the action of ultraviolet light and the change of the coordination mode, and finally, the complex of the ligand Ni 2+ , Cu 2+ metal is synthesized.

A fiber having a polymer sheath and a core. The core has a liquid crystal and a compound capable of photoisomerization, such as that shown below. A method of: providing a first solution of a polymer, providing a second solution of a liquid crystal and compound capable of photoisomerization, and electrospinning the first solution and the second solution to form the fiber.

The present invention relates to the technical field of blue-green light detection materials, and in particular to a fully flexible blue-green light detection material, a preparation method thereof, and an application thereof. The fully flexible blue-green light detection material of the present invention utilizes the unique photoisomerization reaction of pseudostilbene azobenzene groups to blue-green light. The dynamic disorder of the molecular shape drives the microscopic contraction of the film fiber network, stimulating the piezoelectric polymer to output a voltage signal on a macroscopic scale, which can be amplified and detected by an electrometer to realize the detection of the blue-green light intensity. The present invention prepares a fiber film composite material with a microstructure through a material forming method that is simple to operate and can be continuously manufactured on a large area. The present invention utilizes light signals to cause the accumulation of mechanical stress inside the material system, which is further converted into an electric potential difference between the material surfaces through the piezoelectric effect, thereby establishing a continuous transmission mechanism of optical-mechanical-electrical signals, and can prepare a large-area, fast-response, long-life, self-driven intrinsic flexible blue-green light detector.

The present invention provides a means which is capable of suppressing a decrease in transparency in a transparent state under high temperature conditions in a liquid crystal light control element in which light scattering properties are increased by receiving ultraviolet light and the light scattering properties are decreased by receiving visible light. The present disclosure relates to a liquid crystal light control element that comprises: a pair of transparent substrates which each have a transparent electrode and an alignment function layer that is disposed on one surface of the transparent electrode, and which are arranged so that the alignment function layers face each other; and a liquid crystal layer which contains liquid crystal molecules, a photoisomerization material, a non-photoresponsive chiral compound, and a polymer of a photopolymerizable monomer, and which is interposed between the pair of transparent substrates. The light scattering properties of the liquid crystal light control element are increased by receiving ultraviolet light, and the light scattering properties are decreased by receiving visible light. The liquid crystal light control element is characterized in that the average diameter of voids contained in the polymer of the photopolymerizable monomer in a cross section in the plane direction of the liquid crystal layer is smaller than the theoretical value of the helical pitch of the liquid crystal molecules caused by a temperature change from 27°C to 70°C of the helical twisting power (HTP) of the non-photoresponsive chiral compound.

The present invention provides a light-controlled electromechanical material and its preparation method and application, belonging to the field of smart material technology. In the light-controlled electromechanical material prepared by the present invention, spiropyran undergoes a photoisomerization reaction under ultraviolet light irradiation to form a closed-ring spiropyran structure and an open-ring cyanine structure. The two isomeric forms undergo mutual transformation under the conditions of ultraviolet light irradiation of two different wavelengths, and the Young's modulus and strain change, thus having a photoinduced shape memory effect; while the PVDF-based material generates an electrical output when the strain changes, thus having a photoelectric effect; therefore, the present invention combines the photoinduced shape memory property with the piezoelectric property. The prepared light-controlled piezoelectric material not only has a photoinduced shape memory effect, but also has a photoelectric effect. It can be used as both an actuator and a sensor, combining the functions of an actuator and a sensor, overcoming the shortcomings of single-function smart materials.

The application discloses a kind of nano-drugs with low oxygen response and photoisomerization function and preparation and application, belong to the field of biomedicine technology.The present application uses 4,4'-dichloro azobenzene as low oxygen response unit, which is covalently linked with 10-hydroxy camptothecin and drug carrier mPEG to form size-controllable nano-drugs, which have suitable particle size, more conducive to the enrichment of drug circulation in tumor site and play curative effect, when the nano-drugs reach the low-oxygen tumor site, the azo reductase unique to low-oxygen environment will reduce the azo group inside the nano-drugs, resulting in the disintegration of the nano-drug structure, thereby releasing 10-hydroxy camptothecin to play the efficacy of chemotherapy, and reduce the toxic and side effects of drug on normal tissues;In addition, the nano-drug has high utilization rate and good biocompatibility, so it has good application prospect in the preparation of antitumor drugs.

This invention discloses a process and active carrier catalyst for the catalytic synthesis of acetyl empagliflozin. The process utilizes a yeast cell wall-mediated active carrier nickel-phosphorus composite catalyst. The catalyst is activated in a water / glycerol mixed solvent via microwave-ultrasound dual-field synergistic activation, catalyzing the reaction of compound 5 with compound 4 to obtain compound 3. In a supercritical CO2 / ionic liquid system, leveraging the photoisomerization properties of spiropyran-quaternary ammonium iodide, under low-voltage electrocatalysis and UV-Vis switching conditions, the directional glycosylation reaction of compound 3 with compound 2 is achieved to obtain compound 1. This invention utilizes the porous structure and functional groups of the yeast cell wall to stabilize nano-nickel-phosphorus particles, improving catalytic efficiency and reusability. Through the synergistic guiding effect of photoresponsive molecules and ionic liquids, high selectivity of the reaction is achieved. The entire process uses green solvents, and a closed-loop catalyst recovery process is established, offering advantages such as environmental friendliness, low cost, and high product purity.

The invention discloses black polyimide with high ultraviolet light sensitivity as well as a preparation method and application thereof, belongs to the technical field of functional polymer materials, and solves the problem that polyimide in the prior art cannot have excellent masking capability and ultraviolet light sensitivity at the same time. The structural formula of the polyimide is as follows: # imgabs0 #, and a structural unit A is polyaryl ether or polyaryl ketone; the structural unit B is tetraphenyl cyclopentadiene biphenyl; the structural unit C is diphenylamine or biphenol; and n is a positive integer from 1 to 50. According to the invention, reasonable molecular structure design is carried out on polyimide to prepare the intrinsic high-ultraviolet photosensitive black polyimide, so that the intrinsic high-ultraviolet photosensitive black polyimide is subjected to photoisomerization after exposure.

The purpose of the present invention is to improve a response speed from a transparent state to a screen state in a liquid crystal dimming element in which light scattering is increased by receiving ultraviolet light and light scattering is reduced by receiving visible light.　A liquid crystal dimming element according to the present invention comprises: a pair of transparent substrates that each have a transparent electrode and an alignment function layer disposed on one surface of the transparent electrode, and that are disposed such that the alignment function layers face each other; and a liquid crystal layer that includes liquid crystal molecules, a photoresponsive material containing a photoisomerization material, and a polymer of a photopolymerizable monomer, and that is interposed between the pair of transparent substrates, wherein light scattering is increased by receiving ultraviolet light and light scattering is reduced by receiving visible light. The liquid crystal dimming element is characterized in that an angle ϴ [°], formed by an axial direction of an orientation force in which the alignment functional layer acts on the liquid crystal molecules and an axial direction of an orientation force in which the polymer of the photopolymerizable monomer acts on the liquid crystal molecules, satisfies 0<ϴ≤90.

The invention relates to biological application of binary system triplet-triplet annihilation up-conversion luminescence in Schiff base controllable photoisomerization based on a sleeve device, a binary up-conversion system is constructed through regulation and control of a photosensitizer and an annihilation agent, near-infrared light or long-wavelength visible light is converted into short-wavelength blue light, Trans-to-Cis isomerization of Schiff base is triggered, and reactive oxygen species are synchronously generated. An inner-outer double-layer sleeve closable structure is innovatively adopted, accurate regulation and control of the photosensitizer-annihilation agent proportion and independent separation of a substrate are achieved, the technology breaks through the biological penetration limitation of a short-wavelength light source, and a novel light-activated prodrug release strategy is provided for tumor targeted therapy.

The invention provides a photosensitive amphiphilic expanded microsphere and a preparation method thereof. The photosensitive amphiphilic expanded microsphere provided by the invention comprises a thermoplastic shell, alkane gas coated in the shell and an azide naphthoquinone group grafted on the surface of the shell. The photoisomerization reaction is utilized to enable the expanded microspheres to have the characteristics of photosensitivity and amphipathy, in the process of synthesizing the expanded microspheres, inorganic dispersants such as silicon dioxide, magnesium hydroxide and hydroxy calcium phosphate used in the synthesis of the expanded microspheres are not used, and the modifiability of the microspheres is improved; and the hydrophilic-oleophylic conversion of the microspheres can be realized by controlling the illumination time.

The present application relates to the technical field of biological materials, and particularly relates to a pillar arene-based photoresponsive MOF-based ion gate nano-channel and a preparation method thereof. The pillar arene-based photoresponsive MOF-based ion gate nano-channel is prepared by taking PET as a substrate to prepare a bullet-shaped nano-channel, the substrate can provide structural support; taking a pillar arene-based P5A-MOF-1 as a core functional layer, the functional layer can provide a stable cavity environment; filling an organic aromatic azo compound in the cavity of the P5A-MOF-1 to realize a photoresponsive structural change. The effective volume of the cavity of the P5A-MOF-1 is regulated through photoisomerization of the azo group, and then precise gating of ion transmission is achieved. The preparation method is simple in operation, mild and controllable in conditions, and is conducive to large-scale production.