114results about How to "Good photoresponse performance" patented technology

The invention discloses a black phosphorus and gelatin based composite hydrogel and an application of the black phosphorus and gelatin based composite hydrogel to bone tissue engineering. The composite hydrogel comprises black phosphorus and gelatin modified by double bonds, wherein the total content of the gelatin modified by double bonds is 5%-99.9%. The biocompatibility of the composite hydrogel is good, the safety is high, the composite hydrogel has excellent mechanical properties and biological performance at the same time, supports the growth and osteogenic differentiation of the cell, and has obvious effects on promoting the generation of new bones and repairing bone defects; a hydrogel matrix having the appropriate performance is specifically constructed by chemically modifying thegelatin, meanwhile, the mineralization speed of the hydrogel is controlled by using the characteristic of the black phosphorus oxidizing in the coexistence of light, oxygen and water and the induction effect of the black phosphorus on the calcium element through the photocontrol, so that the process of repairing the bone is effectively regulated and controlled. The safety of the product is good,the performance is reliable, the operation is convenient, the repeatability is good, and the composite hydrogel is easy to industrialize.

The invention discloses a porphyrin/aluminum oxide nano-channel membrane and an application thereof in an energy conversion device, and belongs to the field of energy conversion of nano materials. Theenergy conversion device takes a self-made porphyrin/aluminum oxide nano-channel membrane as a medium, and synergistically converts the clean and sustainable solar energy and salinity gradient energyinto electric energy which can be directly utilized by human beings. The porphyrin/aluminum oxide nano-channel has cation selectivity and light responsiveness at the same time, and the ionic currentflux passing through the salinity gradient system increases under the assistance of simulated sunlight, so that the power generation power is increased. According to the invention, a light-assisted enhanced salinity gradient power generation system is constructed by only relying on the porphyrin/aluminum oxide nano-channel membrane, and the light energy and the salinity gradient energy are simultaneously utilized to increase the overall electric energy output, thereby providing a brand new idea for the design and performance enhancement of other nanofluidic energy conversion devices.

The invention discloses a visible-light catalytic film with dual oxygen-assisted catalytic layers and a preparation method and application thereof. The preparation method comprises the steps: (1) carrying out codeposition by adopting a three-electrode system in a manner of taking conductive glass as a working electrode, and then, carrying out constant-temperature calcination, so as to obtain a Fe2O3 film; (2) carrying out codeposition by adopting the three-electrode system in a manner of taking the Fe2O3 film as a working electrode, and then, carrying out natural air-drying, so as to obtain a Fe2O3-FeOOH catalytic film; (3) carrying out codeposition by adopting the three-electrode system in a manner of taking the Fe2O3-FeOOH catalytic film as a working electrode, and then, carrying out natural air-drying, thereby obtaining the catalytic film with the dual oxygen-assisted catalytic layers. The catalytic film disclosed by the invention is used for treating phenolic wastewater; two kinds of oxygen-assisted catalysts, i.e., FeOOH and NiOOH are built in the Fe2O3 film by a cyclic volt-ampere deposition method, so that the photoelectrocatalytic oxygen yielding performance and photocatalytic stability of the Fe2O3 film are greatly improved.

The invention discloses a preparation method for a multilayer composite photosensitive artificial skin sensor. Freeze drying can be performed on graphene after the graphene is treated by an HI/HAC solution; the graphene is put into toluene to perform treatment; an AgNO3 solution is added into an FGS water solution; a graphene-silver nanocomposite can be obtained after centrifugation and washing; asurfactant can be dropped into an oxidized graphene-silver nanocomposite dispersion liquid so that an azobenzene-oxidized graphene-silver nanocomposite aqueous solution can be prepared; anti-stick treatment can be performed on a substrate silicon; waste silk can be taken to perform degumming, heating and concentration can be performed, and silk fibroin can be applied on a silicon chip to performfilm forming; and film forming can be performed on the azobenzene-oxidized graphene-silver nanocomposite aqueous solution and PDMS in a spin-coating manner, so that the multilayer composite photosensitive artificial skin sensor can be obtained. The obtained artificial skin has a good biocompatibility function, physical and mechanical property and photoresponse performance, and resistance changes occur under certain external force and illumination.

The invention provides a photo-responsive random copolymer and a preparation method thereof and relates to a random copolymer. The photo-responsive random copolymer is prepared by PEGMA and 4-oxyazobenzene-methacrylate. The preparation method comprises the steps that 4-hydroxyl azobenzene, TEA and THF are mixed to obtain a mixed solution A, cooling is performed to reach 0-5 DEG C, and methylacryloyl chloride dissolved in the THF is added to the mixed solution A; filtration is performed after reaction, the filtrate is collected and is dissolved in methylene chloride after rotary evaporation, anhydrous magnesium sulfate is added after washing for drying and filtering, the filtrate passes through a column after rotary evaporation to obtain a 4-oxyazobenzene-methacrylate monomer, then a PEGMA monomer, a CDB chain transfer agent, an initiator AIBN and the THF are added, and polymerization reaction is performed under argon gas protection and stirring after freezing, thawing and degassing and is terminated through liquid nitrogen quenching; the reaction mixture liquid is subjected to precipitation with n-hexane and dialysis with distilled water to obtain dark red viscous liquid, and suction filter is performed to obtain the photo-responsive random copolymer.

The invention discloses a supermolecule bisazobenzene compound and a preparation method thereof. The supermolecular bisazobenzene compound is characterized in that 4-hydroxyl-4'-(4-nitrophenylazo)azobenzene is taken as the hydrogen bond donor, polytetravinyl pyridine is taken as the hydrogen bond acceptor, and the supermolecular bisazobenzene compound is obtained through the hydrogen bond self-assembly between 4-hydroxyl-4'-(4-nitrophenylazo)azobenzene and polytetravinyl pyridine according to a mole ratio of 1-4:4. When the mole ratio of bisazobenzene chromophore to pyridine group reaches 1.0, the obtained supermolecule compound still has good solubility, moreover, pyridine rings are all bonded with hydrogen bonds to form the supermolecule compound at this time, and thus the two-photon optical storage pattern is most clear.

The invention belongs to the field of photocatalysts, and provides a cobalt titanate doped titanium nitride photocatalyst for hydrogen production and a preparation method. The preparation method comprises the following steps: firstly, putting titanium dioxide nanotubes and metal magnesium particles in a reaction kettle for carrying out high-temperature reaction in a nitrogen atmosphere, thus obtaining titanium nitride; then, adding the titanium nitride into an aqueous solution prepared from deionized water and ethanol, thus forming a suspension solution; finally, adding cobalt titanate into the suspension solution, and carrying out centrifuging, filtering and drying/laser sintering after stirring reaction, thus obtaining the cobalt titanate doped titanium nitride composite photocatalyst. According to the preparation method disclosed by the invention, by utilizing the advantages of narrower band gap and good photo-responsiveness in a visible light zone of the cobalt titanate, a p-n heterojunction photocatalyst is formed by compounding the cobalt titanate with the titanium nitride, so that the photo-responsiveness of the titanium nitride is broadened, the photocatalytic efficiency ofthe titanium nitride is increased, and the hydrogen production efficiency is also increased.

The invention discloses a preparation method for a spiropyran-based random copolymer P(SPMA-co-MAA). The method comprises the steps that spiropyran-based acrylate and 2-nitryl benzyl methacrylate are subjected to atom transfer radical polymerization in an oxygen-free environment on the condition that copper halide, a ligand and an initiator exist, and an obtained intermediate polymer P(SPMA-co-NBM) is subjected to an NBM unit decomposition reaction under ultraviolet irradiation to obtain the spiropyran-based random copolymer P(SPMA-co-MAA). According to the method, the advantages that the reaction speed is higher, the reaction condition is mild, the operation process is convenient, and the product loss is little are achieved, the toxic action possibly caused to a catalyst due to the fact that atom transfer radical polymerization is performed by directly adopting methacrylic acid is effectively avoided, the defects that existing chemical hydrolysis is low in yield and complex in process are overcome, and the good developing prospect on functional polymers and the technical fields thereof is achieved.

The invention belongs to the technical field of detection material preparation, and relates to a preparation method and application of a photo-responsive molecularly-imprinted material based on magnetic ferroferric oxide nanoparticles. The preparation method comprises the following steps: firstly, preparing the ferroferric oxide nanoparticles and a photoresponse functional monomer MAPASA, synthesizing silicon dioxide-coated ferroferric oxide nanospheres, and then carrying out chemical double bond modification on the silicon dioxide-coated ferroferric oxide nanospheres so as to finally obtain the photo-responsive imprinted material based on the magnetic nanoparticles. The photo-responsive imprinted material prepared by the invention can solve the problem of low efficiency of releasing and enriching target molecules; the imprinted material has an obvious core-shell structure consistent with the target of the invention; and meanwhile, the performance of the molecularly imprinted materialand the performance of a photo-responsive intelligent material are combined, and the imprinted material is successfully applied to efficient detection of dibutyl phthalate.

The invention discloses a light response liquid crystal elastomer fiber membrane and a preparation method thereof. The fiber membrane is prepared by adopting a cross-linkable light response liquid crystal polymer or mixing the cross-linkable light response liquid crystal polymer and a high polymer material, performing high-voltage electrostatic spinning, and adding a cross-linking agent for reaction, wherein the diameter of the fiber is 10 nm-100 [mu]m, and the thickness of the fiber membrane is 100 nm-1 mm. According to the method, the fiber membrane of a side chain type light response liquidcrystal polymer is prepared by electrostatic spinning, so that the liquid crystal polymer is subjected to dual orientation of an electric field and a force field simultaneously under a high pressurefield, and the orientation of liquid crystal units in each fiber can be greatly improved. Meanwhile, the preparation of the overall high-orientation fiber membrane is easily realized by controlling the spinning condition and changing a receiver.

The invention relates to a preparation method of antisotropic azo polymer/carbon tube composite thin film with photo-responsitivity. An azo polymer and a modified carbon tube composite film are prepared into a flexible polymer thin film with in plane anisotropy through synthesis of the azo polymer and modification of a carbon tube film; a flexible thin film with in-plane conducting anisotropy can be obtained through polymer molecular chains are orientated along a carbon tube under the induction of the carbon tube, and the conductivity in the in-plane horizontal direction is higher than that in the direction which is vertical to the carbon tube by one order of magnitude; under UV (Ultraviolet) irradiation, the conductivity of an azo polymer-carbon tube composite film is changed, and since azo molecules are in cis-trans isomerization under the UV irradiation and the molecular distance of a cis structure is reduced, higher conductivity is obtained; the conductivity of the azo polymer-carbon tube composite flexible thin film has good repeatability along with the change of irradiation, and good photo-responsitivity is expressed by the azo polymer-carbon tube composite flexible thin film; the antisotropic azo polymer/carbon tube composite thin film is expected to be applied to many fields of aerospace, organic photoelectric devices and the like.

The invention discloses a preparation method for photo-response pyrene-azobenzene non-covalent decorating carbon nano tube material. The method comprises the following main processes: a few-walled carbon nano tube is added into sulfuric acid and nitric acid mixed solution so as to obtain the few-walled carbon nano tube with better dispersity; N-hydroxy sulfo-Sulfo-NHS and 1- ethyl-3-(3-Trimetlylamine propyl group) EDC HCl catalytic pyrenebutanoic acid are used for condensation reaction to nitro linear alkyl amido-azobenzene so as to obtain Pyr-AZO; then photo-response pyrene-azobenzene non-covalent decorating carbon nano tube body can be composed by using the adsorption of a pyrene structure and pi-pi electronic conjugated bonds on the surface of the carbon nano tube. In the method, through non-covalent interaction, the obtained carbon nano tube-azobenzene composite has an excellent dissolubility and has an excellent photo-response character.

The invention discloses a liquid crystal gel with luminescence and photoresponse characteristics. The liquid crystal gel comprises the following components in parts by weight: 0.5-11.5 parts of gelator, 1.0-12.0 parts of photoresponse luminescence liquid crystal and 76.5-98.5 parts of nematic phase liquid crystal, the gelator is self-assembled to form a three-dimensional network through hydrogen-bond interaction and pi-pi interaction, the photoresponse luminescence liquid crystal and the nematic phase liquid crystal are uniformly dispersed in a spatial network, energy transfer exists between the two, and the gelator is endowed with dark blue luminescence. Under the irradiation of ultraviolet light, the photoresponse luminescence liquid crystal is isomerized, energy transfer disappears, the luminescence color and intensity of the gel are changed, and photoresponse is achieved. The liquid crystal gel provided by the invention is simple in preparation method, good in stability, high in modulus, capable of storing luminous images and wide in application prospect in the fields of flexible display, information storage and the like.

The invention discloses a method for preparing double-stimulation responsive surface through secondary photopolymerization, relating to the field of grafting and modification of various base material surfaces. The method comprises the following steps: I, grafting pH responsive compound onto the surface by adopting a cracking type photoinitiator, wherein the pH responsive compound grafted onto the surface can be used as a hydrogen donor and a co-initiator of the next step reaction; and II, performing photopolymerization reaction on the basis by adopting a hydrogen abstracting type initiator, and grafting the double bond-modified photoresponse compound. The method not only has the advantage that the photopolymerization is efficient, energy-saving, economical, environment-friendly, and the like, but also the compound is difficult to drop after being grafted onto the surface through a covalent bond manner. The prepared intelligent surface has good photoresponsiveness, pH responsiveness, and the swelling property and wettability of the surface polymer can be reversibly controlled. The surface has potential application on the aspects of surface molecule switches, surface controlled release and ion adsorption due to good controllable wettability and mechanical effect.

The invention provides a star-shaped polymer with optical/thermal triple shape memory. The structural formula of the star-shaped polymer is shown in the specification, the star-shaped polymer with optical/thermal triple shape memory prepared by the invention has a clear branched structure, and each unit volume has more functional groups, so that the star-shaped polymer has good shape memory performance.

The invention discloses a preparation method of photocuring hydrogel microspheres capable of promoting angiogenesis, and belongs to the technical field of biological material preparation. The hydrogel microsphere is a high-specificity angiogenesis promoting material, has the effects of promoting cell adhesion, increasing vascular permeability, denaturation of an extracellular matrix, migration and proliferation of vascular endothelial cells, angiogenesis and the like, and can be prepared in batches. The hydrogel microspheres are prepared by the following steps: by taking a natural-source high polymer material gelatin as a substrate material, modifying the gelatin through methacrylic anhydride, grafting a vascular endothelial growth factor (VEGF) onto a molecular skeleton of methacrylic acid acylated gelatin by adopting a covalent linkage method on the basis, and then forming the microspheres in batches under the action of an electric field. The controllable light-cured hydrogel microspheres prepared by the method have good biocompatibility, can be degraded in vivo, have the effect of promoting vascularization, can actively induce cell adhesion, and have good application prospects in regenerative medicine and clinical treatment.

The invention discloses a method for preparing a titanium dioxide nano-film on the surface of expanded polytetrafluoroethylene. The method for preparing the titanium dioxide nano-film on the surface of expanded polytetrafluoroethylene comprises the following steps: treating a cleaned expanded polytetrafluoroethylene substrate in a plasma reactor; coating the expanded polytetrafluoroethylene substrate with a tetrabutyl titanate solution in a spinning manner; and then treating by using a hydrothermal method. The preparation method is simple in process, convenient to operate and easy to implement. TiO2 nanoparticles in the prepared film are uniform and compact, and are combined with the expanded polytetrafluoroethylene substrate quite firmly, the photosensitivity is high, and the titanium dioxide nano-film has huge potential application in the fields of photocatalysis, tissue engineering and the like.

The invention discloses a photo-responsive quaternary cationic surfactant capable of forming a wormlike micelle and a synthetic method thereof. The surfactant has a structural formula as shown in the specification. In the formula, R represents a straight-chain alkyl group. The photo-responsive quaternary cationic surfactant is prepared from p-hydroxyazobenzaldehyde, 1,2-dibromoethane and N,N-dimethylalkylamine through a reduction reaction, a Williamson ether synthesis reaction and a quaterization reaction. The synthetic method provided by the invention is simple to operate and uses cheap and easily available raw materials; the synthesized surfactant has high purity and a yield of more than 64.0%; an aqueous solution of the synthesized surfactant has good photo-responsiveness and low surface tension; critical micelle concentration is lower than 4.0*10<-4> mol/L; and the synthesized surfactant can form the wormlike micelle.