58results about How to "Good photochemical stability" patented technology

The invention relates to magnetic fluorescent microspheres and a preparation method thereof. The particle size of the magnetic fluorescent microspheres is 5-10 mu m, the fluorescence excitation wavelength range is 400-700nm, and the fluorescence intensity is not reduced within 24h. The prepration method comprises the following steps: adding a swelling agent into monodisperse carboxylated polystyrene microspheres, and adding magnetic nano microparticles into a swelling system; shaking on a decolorization shaker for 12-48h; using mixed solution of cyclohexane and ethanol for cleaning sediment, and sequentially carrying out ultrasonic dispersion and centrifugal separation till supernatant liquid is colorless under an ultraviolet lamp; and saving a final sediment product in 1ml of liquor. Compared with the existing magnetic fluorescent microspheres, the magnetic fluorescent microspheres have the advantages of uniform and controllable diameter, good fluorescence stability, simple preparation process, multiple types of fluorescence codes and the like, and can not only carry out fast separation and purification on reactants by being applied in the biological macromolecular detection, but also simultaneously detect a plurality of target molecules in a sample to be detected in a reaction tube and a hole, thereby being widely applied in the fields of immunoassay, nucleic acid hybridization, genotype analysis and the like.

The invention discloses a special modified rosin resin for road marking paint and a preparation method of the special modified rosin resin. The modified rosin resin comprises the following raw materials in percentage by weight: 67.4%-84.8% of gum rosin, 10%-18% of glycerol, 2%-8% of fumaric acid, 3%-6% of lauric acid, 0.1% - 0.3% of antioxidant and 0.1% - 0.3% of ultraviolet light absorber. The preparation method of the special modified rosin resin comprises the following steps of: adding the gum rosin to a reaction kettle, introducing nitrogen, heating so as to dissolve rosin, adding the fumaric acid, the antioxidant, the glycerol and the lauric acid so as to carry out polymerization esterification reaction, then adding the ultraviolet light absorber, uniformly stirring, and cooling to a room temperature, thus obtaining the product. The modified rosin resin produced by the method can be used for ensuring the strong adhesive force of coatings and has good flexibility and the advantages of cost conversation and environmental protection.

The invention relates to the technical field of anti-bacteria, particular to a preparation method for an antibacterial fibre. The method comprises the following steps of: adding a fibre base materialinto a first solvent, and stirring at a first stirring temperature for a first time to obtain first electrostatic spinning base liquid; simultaneously adding a photocatalytic material and a dispersantinto a second solvent, and stirring at a second stirring temperature for a second time to obtain second electrostatic spinning base liquid; stirring and mixing the first electrostatic spinning base liquid and the second electrostatic spinning base liquid to form electrostatic spinning liquid; and performing spinning on the electrostatic spinning liquid to prepare the antibacterial fibre. According to the embodiment of the invention, the preparation conditions are mild; the photocatalyst activity is excellent; the cost is low; a production process is simple and easy to control; industrial production is facilitated; and the antibacterial fibre has excellent antibacterial effect on the bacteria, such as escherichia coli and staphylococcus aureus, and is suitable for the fabrics, such as clothing and socks, decoration fabrics, such as curtains and table cloth, outdoor products, such as field tents and quick-drying clothes, and the medical products, such as medical gauze and surgical masks.

The invention discloses a high visible-light catalytic activity material for a BiOCl/ZnO heterojunction and a preparation method thereof. The method comprises the steps of (1) preparing a solution A;(2) preparing a solution B; (3) mixing the solution A and the solution B to prepare into mixed liquor C; (4) dropwise adding a hexamethylenetetramine water solution into the mixed liquor C to obtain aflower-shaped BiOCl crystal; (5) respectively dissolving zinc acetate hexahydrate and hexamethylenetetramine into different deionized water to prepare into a solution I and a solution II; (6) mixingthe solution I and the solution II to form mixed liquor III; (7) uniformly mixing the mixed liquor III and BiOCl micro powder, reacting for 6 hours at 80 DEG C to 100 DEG C, naturally cooling after reaction, and washing, drying, cooling and grinding a product to obtain the high visible-light catalytic activity material for the BiOCl/ZnO heterojunction. The method is short in reaction time, mild inreaction condition and simple to operate. The BiOCl/ZnO heterojunction prepared through the method can absorb visible light, has photocatalytic activity of degrading rhodamine B under visible light,and has the characteristic of good photochemical stability.

The invention belongs to the technical field of organic photoelectric functional material and provides anionic iridium complex coated polymer nano-particles and a preparation method and application thereof. Firstly, a phosphorescent iridium complex for detecting hypochlorite (ClO-) and containing oximido groups (-C = N-OH); secondly, a ring opening polymerization method is adopted and polyethylene glycolis used as an initiator to prepare anamphiphilic polymer polyethylene glycol-polylactic acid (mPEG-PLA); finally, the iridium complex and the amphiphilic polymer perform self-assembly to obtain the ionic iridium complex coated polyethylene glycol-polylactic acid polymer nano-particles by adopting a nano precipitation method. The nano-material coated iridium complex has the following structural formula. The nano-material can be applied to the fields of hypochlorite detection, cell marking and imaging, time-resolved service life imaging and the like. The nano-particles are uniform in size, good in biocompatibility, simple to prepare, remarkable in ClO- detection effect, good in selectivity and quick to response and can be excited by visible light.

The invention relates to the technical field of photocatalytic materials, in particular to a photocatalytic gel material and a preparation method thereof. The method comprises the following steps of obtaining a carbon-nitrogen precursor solution; adding a metal salt solution into the carbon-nitrogen precursor solution to obtain photocatalytic hydrogel; freeze drying the photocatalytic hydrogel toobtain photocatalytic aerogel; adopting a two-step calcination method to obtain a metal@C3N4 photocatalytic gel material and/or a metal compound@C3N4 photocatalytic gel material. The photocatalytic gel material and the preparation method thereof have the advantages that the preparation process is simple, the preparation cost is low, the prepared carbon nitride photocatalytic gel material has goodphotocatalytic performance and chemical stability, can be used as an environment-friendly and antibacterial product and is used in the fields of air purification, sewage treatment, water body antibacterial, cosmetics, medical biological materials such as medical antibiosis, wound protection and the like, soil restoration, water and soil humectant, soilless culture, plant growth and the like, and the gel material can also avoid harms to the environment and play a role in environmental protection.

The invention relates to a specific fluorescence labeling method of food-borne probiotics. The method includes following steps: (a), preparing a Cr3+doped gallium zinc germanate long-afterglow fluorescent nano probe having near infrared fluorescence and ultralong-afterglow properties through a solvothermal-high-temperature calcining process; (b), realizing specific fluorescence labeling of the nano probe to target probiotics through antibody surface functionalizing. The method has the advantages that the nano probe prepared by the method has ultrastrong near infrared luminescence, ultralong afterglow life, excellent biocompatibility and structural stability, high grain size uniformity and low toxicity; near infrared fluorescence labeling probiotics in-vivo biological imaging technology developed by the invention can realize nondestructive tracing of distribution of probiotics after entering organisms, and the method is of important significance in developing functional sites of innovative food-borne probiotics and nutriology research concepts.

Nanocrystals having a ZnTe core and methods for making and using them to construct core-shell nanocrystals are described. These core-shell nanocrystals are highly stable and provide quantum yields and stability suitable for applications such as flow cytometry, cellular imaging, and protein blotting, medical imaging, and other applications where cadmium toxicity is an issue.

The invention discloses an ordered Pt-TiO2/InP nanowire array electrode material applied to hydrogen production through water decomposition and a preparation method of the material, and belongs to the technical fields of design and preparation of new energy materials and energy conversion and application. Firstly, periodical orderly arranged InP nanowire arrays are prepared through nanometer impression in combination with the metal organic chemical vapor deposition technology; and a TiO2 protection layer and Pt promoter layer are deposited on the surfaces of InP nanowires in sequence through the atomic layer deposition and electron beam evaporation technologies. The saturated photocurrent density of the prepared ordered Pt-TiO2/InP nanowire array electrode material can reach 27.7 mA/cm<2> under the standard simulated sunlight illumination condition, the energy conversion efficiency can be up to 6.9%, and the stability is good. The process is simple, easy to implement and environmentally friendly, large-area preparation of the electrode material can be achieved, and engineering application and popularization are facilitated.

The invention provides silicate-coated titanium dioxide photocatalyst powder and a preparation method thereof. According to the preparation method, photocatalyst-type titanium dioxide serves a carrier, silica sol serves as a coating material, an amino silane coupling agent serves as a chelating agent, titanium dioxide particles are coated with silicate, the particle size of the coated titanium dioxide photocatalyst powder of 0.5-1.5 micrometers, the specific surface area is larger than or equal to 200m<2>/g, and the coated titanium dioxide photocatalyst powder contains 5-40% of the silicate bymass and can be used for preparing high-solid-content photocatalyst aqueous solutions and photocatalytic materials taking organic matter as a carrier. The silicate-coated titanium dioxide photocatalyst powder has the advantages of stable silicate adsorption, high coating rate, controllability, low oil absorption, high photocatalytic activity and the like; by the photocatalyst powder easy to disperse, degradation of the organic carrier is avoided; the preparation method has the advantages of easiness in acquisition of raw materials, simplicity and convenience in process, stable silicate coating and controllable coating rate.

The invention belongs to the technical synthesis field of nano materials, and discloses a Ni(OH)2/SrTiO3 composite catalyst and a preparation method and application thereof in photolysis of aquatic hydrogen. SrTiO3 serves as a primary catalyst, Ni(OH)2 serves as a cocatalyst, and the Ni(OH)2 nanoparticle modified SrTiO3 composite catalyst is synthesized through a simple preparation method. The preparation method is easy to operate and control, the product obtained through the preparation method is good in stability, and the photocatalytic effect of SrTiO3 is greatly improved. In an experiment,the molar ratio of Ni(OH)2 in the Ni(OH)2/SrTiO3 composite is 0%, 0.5%, 5%, 10%, 20% and 25% respectively and is labeled as N0, N0.5, N5, N10, N20 and N25 respectively. The result shows that the composite amount of Ni(OH)2 reaches 20% (molar ratio) under UV-vis radiation, the optimal photocatalytic activity for producing H2 in a methanol solution is 1461.7 micromol h(-1) g(-1), which is about 15times that of the hydrogen production rate of SrTiO3 before treatment, and the hydrogen production rate of SrTiO3 before treatment is 97.7 micromol h(-1) g(-1).

The invention discloses a water soluble quantum dot and a preparation method thereof. The preparation method comprises the following steps: dropwise adding a stock solution of nucleic acid into an oil soluble quantum dot solution, after addition, stirring the solution for 20 to 40 minutes at a room temperature; then adding deionized water into the solution, stirring the solution for 5 to 20 minutes; and when layering of the solution appears, subjecting the solution to centrifugal separation to obtain the water soluble quantum dots. Cheap and commercialized nucleic acid and corresponding nucleosides are taken as the raw materials to carry out ligand exchange of quantum dots, the obtained water soluble quantum dot has a good chemical stability and also has a reversible effect, and namely, after the phase transition is realized through nucleic acid ligand exchange, the original ligand can be changed back relatively easily. The water soluble quantum dot can tolerate some extreme conditions such as pH range (3-13), sodium salts (NaCl) concentration (5 mmol/mL), and the like.

The invention relates to a glucose electrochemical biosensor based on a ZnO nano material and a method for detecting glucose concentration by using same. The glucose electrochemical biosensor is obtained by jointly modifying the surface of a glassy carbon electrode with the ZnO nano material and glucose oxidase; when the glucose electrochemical biosensor is used for electrochemical detection of glucose concentration, the method comprises the following steps: continuously dropwise adding glucose solutions with different concentrations in a detection pool by taking a PBS buffer solution as a base solution and the glucose electrochemical biosensor as a working electrode to obtain a current-time curve; fitting a standard curve of glucose concentration and current under the detection conditions; adding a certain volume of glucose solution to be detected into the detection cell and the same detection cell according to the current-time curve method, and reading a response current A value of the working electrode; and finally, determining the concentration of glucose in the detection pool according to the points drawn on the standard curve, and performing converting to obtain the concentration of the glucose to-be-detected solution in the third step.

The invention discloses fluorescent small-molecular probes based on a single benzene ring and a synthesis method thereof, belonging to the technical field of synthesis of small-molecular fluorescent probes. The fluorescent small-molecular probes use a single benzene ring as a basic structure and use azetidine and an alkoxycarbonyl group as an electron donor and an electron acceptor respectively; aseries of single-benzene-ring fluorescent small molecules are designed and synthesized by regulating and controlling the relative positions and numbers of two substituent groups on benzene rings, andare a series of single-benzene-ring small-molecular fluorescent probes with a wide solvent application range and flexibly adjustable fluorescent colors; the probes can show different solvatochromic behaviors based on an electronic push-pull structure; and the active reaction group, i.e., an ethoxycarbonylacyl group is introduced, so subsequent further derivation of the probes in practical application is facilitated.

The invention discloses a narrow-emission efficient multi-resonance light-emitting material, a preparation method thereof and an organic light-emitting diode. The structural general formula of the material is shown in the specification, in the formula, a, b, c and d are respectively and independently selected from aromatic ring groups or aromatic heterocyclic groups with the ring atom number of 5-30; X and Y are each independently selected from nitrogen or oxygen atoms; R1 to R15 are respectively and independently selected from a hydrogen group, a substituted or unsubstituted aromatic ring group or aromatic heterocyclic ring group with the ring atom number of 5 to 50, a straight chain or straight chain alkyl group with the carbon atom number of 1 to 100, and a straight chain or straight chain alkoxy group with the carbon atom number of 1 to 100; R1 to R5 may also be cyano groups; R14 and R15 are each independently present or absent; A and B independently exist or do not exist, and when A and B independently exist, A and B are independently selected from one of an oxygen group atom and an alkyl group; '---' represents that the components can be linked into a bond or can not be linked into a bond. After the material is applied to an organic light emitting diode, the material shows excellent properties of high luminous efficiency, narrow emission spectrum, low sensitivity to doping concentration and the like.