26 results about "Nanoparticle dispersion" patented technology

The invention relates to the technical field of oil-displacing agents, and particularly discloses a targeted nano oil-displacing agent and a preparation method thereof. A preparation method of a targeted nano oil displacement agent comprises the following steps: S1, dispersing 10-30 parts by mass of silanized inorganic nanoparticles in an alcoholic solution, adding 5-12 parts by mass of a functional monomer, 8-20 parts by mass of a hydrophilic monomer and 5-15 parts by mass of a hydrophobic monomer in an inert atmosphere, uniformly mixing, heating to 75-85 DEG C, adding an initiator, carrying out a constant temperature reaction for 4-6 h, and cooling to obtain a pre-grafted nanoparticle dispersion liquid; s2, mixing the pre-grafted nanoparticle dispersion liquid with a composite surfactant, adjusting the pH value to 6.5-7.5, and mixing at 30-40 DEG C for 22-26 hours to obtain the targeted nano oil displacement agent, the targeting type nano oil displacement agent prepared by the invention can still keep excellent dispersion stability and ultralow interfacial tension under the condition of a high-salt oil reservoir, so that the oil displacement efficiency is remarkably improved.

The invention discloses a sheet deicing structure, a composite ice dredging coating and a preparation method thereof, and belongs to the technical field of wind power generation. The preparation method of the composite ice-dredging coating comprises the following steps: dispersing silicon dioxide nanoparticles in an organic solvent to form a nanoparticle dispersion liquid with the concentration of 1-10wt%; and then, adding low-surface-energy resin and a curing agent into the nano-particle dispersion liquid, and treating under the ultrasonic action and the ice-water bath condition to obtain the composite ice-dredging coating. In addition, the invention also provides the composite ice-dredging coating prepared by the preparation method. In addition, the invention further provides a blade deicing structure which sequentially comprises a surface anti-icing layer, a heating layer, a heat conduction layer and a structural layer from top to bottom. The surface anti-icing layer is made of the composite ice dredging coating. The composite ice dredging coating provided by the invention realizes effective ice prevention and removal of the blade.

This invention discloses a method for preparing high-strength aluminum-magnesium-manganese alloy materials, belonging to the field of metallic materials technology. The method uses aluminum as a matrix and adds elements such as magnesium, manganese, zinc, copper, zirconium, and titanium to prepare a master melt. A nano-ceramic suspension of yttrium oxide is prepared, atomized and dried into powder, and blown into the melt to introduce nanoparticles. Semi-continuous casting, homogenization heat treatment, intense plastic deformation such as equal-diameter angular channel extrusion, hot rolling, and aging treatment are employed to achieve nanoparticle dispersion strengthening. Optimizations include nanoparticle replacement, multiphase strengthening, parameter adjustment, and in-situ phase formation, which refine the alloy grain to 80-200 nm, significantly improving strength. Compared with existing technologies, this invention's process is environmentally friendly and precisely controlled, suitable for high-strength applications such as inverter housings, achieving a tensile strength of over 450 MPa and an elongation ≥10%.

The application belongs to the field of inorganic nanomaterials, and particularly relates to a low-temperature synthesis method of modified tin dioxide nanoparticles for perovskite solar cells, which comprises the following steps: dispersing a water-soluble salt or hydrate of tin, urea and a metal salt modifier in water; and obtaining a modified SnO2 nanoparticle dispersion liquid by reacting at 15-30 DEG C for 3-4 days; the metal salt modifier is a metal salt of potassium, cesium, magnesium and / or zirconium. The modified SnO2 nanoparticles can promote the transmission and extraction of electrons in the solar cell, inhibit the recombination loss of the perovskite solar cell, and thus improve the power conversion efficiency and stability of the perovskite solar cell when the modified SnO2 nanoparticles are used as an electron transport layer to prepare the perovskite solar cell.

The invention provides low-hysteresis electronic skin as well as a preparation method and application thereof, and particularly relates to the technical field of biological materials. The preparation method specifically comprises the following steps: S1, preparing seed particles by utilizing a seed feeding emulsion polymerization method, and finishing directional polymerization of the seed particles to obtain a seed emulsion containing the seed particles; s2, preparing a nano-particle dispersion liquid by using the seed emulsion containing the seed particles; s3, preparing a multivalent metal ion solution; s4, the nano-particle dispersion liquid and the multivalent metal ion solution are cross-linked through dynamic coordination bonds to form the three-dimensional network hydrogel electronic skin. According to the invention, self-synthesized nanoparticles are used as a multifunctional cross-linking agent and a conductive matrix, and are subjected to coordination reaction with multivalent metal ions, so that entropy elasticity of the nanoparticles is combined with dynamic nature of metal coordination bonds, and the purposes of low hysteresis, high flexibility, high conductivity and adjustable performance are achieved at one stroke.

The invention provides an electron transport layer and a preparation method thereof, and a perovskite solar cell, and the preparation method comprises the steps: firstly, mixing a water-based SnO2 nanoparticle dispersion liquid with a silane coupling agent, and carrying out a grafting modification reaction under heating and stirring conditions, after the reaction is finished, centrifuging, washing and drying to obtain modified SnO2 powder of which the surface is grafted with a silane coupling agent; secondly, dispersing the modified SnO2 powder in an organic solvent compatible with the perovskite light absorption layer, and performing ultrasonic treatment to obtain SnO2 organic dispersion liquid; and finally, coating the SnO2 organic dispersion liquid on a substrate through a spin-coating method, and carrying out annealing treatment to obtain the electron transport layer. The water-based SnO2 nano-particles are subjected to graft modification through the silane coupling agent, so that the agglomeration tendency of the water-based SnO2 nano-particles in an organic solvent can be effectively inhibited to realize stable dispersion, and a uniform and compact SnO2 thin film with excellent electron transmission performance can be formed on a perovskite light absorption layer through a spin-coating process.

The invention discloses gold-ferroferric oxide Janus structure nanoparticles as well as a preparation method and application thereof, and relates to the technical field of magnetic nanoparticle imaging. The method comprises the following steps: reacting a gold source and a reducing agent in a mixed system of oleylamine and n-octane in a nitrogen atmosphere to obtain gold nanoparticles; the preparation method comprises the following steps: dispersing an iron source in oleylamine, and adding a gold nanoparticle dispersion liquid to obtain oil-phase gold-ferroferric oxide Janus structure nanoparticles; according to the preparation method, the gold-ferroferric oxide Janus nanoparticles with asymmetric structures are constructed and subjected to surface functional modification, so that the gold-ferroferric oxide Janus nanoparticles can be assembled in a specific acidic microenvironment, MPI imaging signals are remarkably improved while efficient enrichment at tumors is realized, and a new way is provided for tumor targeted visualization and radiotherapy sensitization.

This invention discloses a high-abrasion-resistant UV matte ink for printing and its preparation method. The high-abrasion-resistant UV matte ink for printing includes the following components: polyurethane acrylate, photoinitiator, raw tung oil, UV monomer, modified nanoparticle dispersion, matting agent, and additives. Compared with existing products, the ink of this application not only has excellent printability, but also has a fine and stable texture, is not prone to agglomeration, dries evenly and quickly, is fast and efficient in printing, has strong adhesion, and is tough and abrasion-resistant. When this ink is printed on digital 3C products, the printing thickness only needs to be 3-5 μm. Even after more than 5,000 rubs, the clarity and integrity of the pattern and text can still be guaranteed, greatly improving the durability of electronic products. It can be widely used for coating and protection of digital 3C products.

A method includes a step of preparing a nanoparticle that has a perovskite-type crystal structure as an allotrope and includes multiple crystal structures, a step of preparing a ligand solution containing a solvent that has a relative dielectric constant of a prescribed value or less and an associative ligand that includes a main chain having a plurality of carbon atoms and a polar group having a higher polarity than the main chain and self-associates in the solvent, and a step of preparing a nanoparticle dispersion by bringing the nanoparticle and the ligand solution into contact with each other, wherein the step of preparing a nanoparticle dispersion includes a step of selectively increasing the ratio of the content of a prescribed crystal structure in the multiple crystal structures.

The present application relates to a kind of infrared transparent super-hydrophobic coating and its preparation method and application, polypropylene dispersion liquid is sprayed on the surface of substrate, then again spray modified nanoparticle dispersion liquid, heat treatment, obtain composite coating.The method of the present application is combined with special processing process to obtain high-performance coating, which also expands the functionalization of super-hydrophobic materials, and has important practical applications in infrared detection, infrared thermal imaging and other aspects.

The invention discloses nano-hydroxyapatite composite acoustic ink as well as a preparation method and application thereof, and relates to the technical field of biology and new medicine. The ink comprises the following components in percentage by mass: 20%-30% of a hydrogel substrate, 3%-6% of a temperature-sensitive phase change material, 0%-2% of a rheology modifier, 0.8%-1.2% of a thermal initiator, 5%-15% of nano-hydroxyapatite and the balance of an aqueous solvent. The ink system depends on ultrasonic waves with high penetrating power as an energy source, the bottleneck that a traditional photocuring technology is limited by the optical property of a material is broken through, and direct printing of a high-concentration and non-transparent nano-hydroxyapatite composite material becomes possible. According to the preparation method, the high-quality acoustic ink which is uniform in nano-particle dispersion, full in component mixing and free of bubbles is prepared through key operations such as batch ultrasonic dispersion, and the preparation method is very important for realizing the precision of deep-penetration sound wave volume printing and the mechanical property and biological activity of a bone repair scaffold.

The application discloses a kind of gold-Fe3O4 Janus structure nanoparticles and its preparation method and application, it is related to magnetic nanoparticle imaging technical field.The method includes that gold source and reducing agent are reacted in the mixed system of oleylamine and n-octane in nitrogen atmosphere, and gold nanoparticles are obtained;After iron source is dispersed in oleylamine, gold-Fe3O4 Janus structure nanoparticles of oil phase are obtained after adding gold nanoparticle dispersion liquid;The gold-Fe3O4 Janus nanoparticle with asymmetric structure is constructed in the application, and it is surface functionalized modification, so that it can be assembled in specific acidic microenvironment, while realizing the efficient enrichment of tumor, significantly improving MPI imaging signal, and then providing a new way for tumor targeting visualization and radiotherapy sensitization.

The invention discloses a super-hydrophobic surface based on laser micromachining and UV transfer printing and a preparation method thereof, and belongs to the field of material surface modification.The method comprises the steps that a microstructure template is machined on a high-purity metal nickel plate through picosecond or femtosecond laser, a microstructure is copied to the surface of a target base material with high precision through a circulating UV transfer printing technology, and the super-hydrophobic surface is obtained. Large-area splicing larger than 500 mm * 500 mm is achieved, finally, low-surface-energy nano particle dispersion liquid is sprayed, and a micro-nano graded rough structure is constructed after drying. The static water contact angle of the prepared super-hydrophobic surface is larger than or equal to 150 degrees, the rolling angle is smaller than or equal to 5 degrees, and the contact angle attenuation rate lt after the super-hydrophobic surface is abraded by 600 # abrasive paper 500 times; the coating has excellent mechanical durability, chemical stability and self-cleaning, anti-icing and anti-fouling functions, and is simple in process, low in cost and suitable for industrial large-scale production.

The present disclosure relates to a nanoparticle dispersion strengthened copper alloy and a preparation method and use thereof. The method includes the steps of: S1) preparing Cu—Al2O3 dispersed copper powder from Cu—Al alloy powder by internal oxidation and reduction; and S2) mixing the Cu—Al2O3 dispersed copper powder prepared in S1 with Cr powder to obtain a composite powder, and subjecting the composite powder to press forming, hot press sintering, sheath moulding, and then aging treatment, where the hot press sintering is conducted at a temperature of 900° C. to 1070° C. and a pressure of 40 MPa to 80 MPa for 2 hours to 8 hours.

Provided is a method for purifying nanoparticles, the method comprising: a step for preparing nanoparticles which contain a perovskite-type crystal structure as an allotrope and which exhibit a plurality of crystal structures; a step for preparing a ligand solution that contains a solvent having a relative dielectric constant of a prescribed value or less and an associative ligand that has a main chain containing a plurality of carbons and a polar group having a higher polarity than the main chain and that self-associates in the solvent; and a step of preparing a nanoparticle dispersion liquid by bringing the nanoparticles into contact with the ligand solution. The step of preparing the nanoparticle dispersion includes a step of selectively increasing the ratio of a prescribed crystal structure to the content of a plurality of crystal structures.

The application relates to the technical field of super-hydrophobic coating, and discloses a transparent super-hydrophobic coating and a preparation method thereof. The method comprises the following steps: S1, coating an organic coating on a glass surface; S2, etching grooves on the coating by using an etching process until the glass base material at the bottom is exposed; S3, coating a silicon oxide sol on the surface, and after a heat treatment process, the organic coating is decomposed and disappears, so that silicon oxide protrusions are formed at the original organic coating groove; S4, removing the excess silicon oxide on the glass surface treated in the step S3 by using a desolvent flushing method, and then drying the glass surface; and S5, after spraying a hydrophobic silicon oxide nanoparticle dispersion liquid on the glass surface, drying is carried out to obtain the required transparent super-hydrophobic coating. Compared with the prior art, the transparent super-hydrophobic coating can realize the adjustment of the haze of the coating, the transparency, the stability and the super-hydrophobicity at the same time, so that the coating can be applied for a longer time, and the maintenance cost is reduced.

The invention discloses a perovskite solar cell containing an aluminum oxide intermediate layer and a preparation method of the perovskite solar cell, and belongs to the technical field of perovskite solar cells. The preparation method comprises the following steps: sequentially preparing the nickel oxide layer and the self-assembled monomolecular layer on the transparent conductive substrate; preparing an aluminum oxide nano-particle dispersion liquid, adding a polymer dispersant, and stirring to obtain a uniform and stable aluminum oxide nano-particle dispersion liquid; coating uniform and stable aluminum oxide nano-particle dispersion liquid on the self-assembled monomolecular layer by adopting a solution coating method to form a wet film, and performing heat treatment on the wet film to form an aluminum oxide intermediate layer; and sequentially preparing a perovskite light absorption layer, a deposition fullerene derivative layer, a bath copper layer and a metal electrode on the aluminum oxide intermediate layer to obtain the perovskite solar cell containing the aluminum oxide intermediate layer. According to the invention, particle aggregation is inhibited through the steric hindrance effect of the polymer dispersant, the core technology bottleneck of non-uniform and non-compact film formed by a coating method is solved, and the dependence on vacuum equipment is completely eliminated.

The invention belongs to the technical field of membrane separation, and discloses a nanofiber composite ultrafiltration membrane and a gradient aperture preparation method thereof.The nanofiber composite ultrafiltration membrane comprises a nanofiber network composed of a PVDF-HFP polymer matrix containing amino or hydroxyl functional groups and surface modified SiO2 nanoparticles connected with the matrix through Si-O-C covalent bonds; the aperture of the membrane is in continuous gradient distribution along the thickness direction. The method comprises the following steps: preparing a functionalized spinning solution and a modified nanoparticle dispersion solution; forming an initial structure gradient film through electrostatic spinning of gradient voltage and gradient receiving speed; gradient cross-linking shrinkage, gradient heat and humidity regulation and control and ultraviolet-induced interface covalent grafting are sequentially carried out on line; and finally cleaning and drying. According to the invention, accurate regulation and control and multi-performance synergistic improvement of the membrane structure are realized, and the flux, the rejection rate, the pollution resistance and the mechanical stability are remarkably improved.

The present disclosure provides a three-dimensionally arranged nanoparticle film and a preparation method and use thereof, and belongs to the technical field of nanophotonics. The preparation method includes the following steps: coating nanoparticles with hydrophobic molecules, and dispersing in an organic solvent to obtain a modified nanoparticle dispersion; conducting a surface treatment on a three-dimensional template to obtain a hydrophilic three-dimensional template; and adding water to a surface of the hydrophilic three-dimensional template to form a water film, adding the modified nanoparticle dispersion dropwise on a surface of the water film to conduct self-assembly, and removing the water film to obtain a three-dimensionally arranged nanoparticle film with an array structure. In the present disclosure, the nanoparticle film prepared by a self-assembly and template-assisted method can generate vertical and parallel multiple-surface lattice resonances, thereby effectively suppressing radiation loss and enhancing an interaction between light and matters at a nanometer scale.

The invention discloses a food-grade anisotropic nano-particle with a double-domain partition structure and a preparation method of the food-grade anisotropic nano-particle. The nanoparticles comprise shellac and ethyl cellulose, and the shellac and the ethyl cellulose form a spatially distinguishable double-domain partition structure in a single particle, so that the particles are anisotropic. The method comprises the following steps: dissolving shellac and ethyl cellulose in a water-soluble organic solvent to form an organic phase, dissolving polysorbate 80 in water to form a water phase, carrying out impurity removal treatment and temperature balance, rapidly adding the organic phase into the water phase under shear mixing conditions, and carrying out solid-liquid separation to obtain the nano-precipitate and particle internal phase separation based on solvent replacement induction. A nano-particle dispersion system with a double-domain partition structure is obtained; and performing purification treatment to obtain the nano-particle aqueous dispersion. The method is clear in process path and high in controllability, a double-domain partition anisotropic structure can be stably constructed, and the obtained dispersion system has good dispersion stability and storage stability.

The application discloses a kind of gold nanoparticles self-assembly two-dimensional film with Fano resonance characteristics and application, belong to photocatalytic nanomaterial technical field.The two-dimensional film is made by two steps: step 1, four chloroauric acid and quaternary ammonium salt are added into sodium borohydride solution, stirring is carried out at 30-40 DEG C for 2-4h, solution A is obtained;Solution A is added into solution B containing ammonium salt, four chloroauric acid and ascorbic acid, stirring is carried out at 30-40 DEG C for 10-15h, and the gold nanoparticles obtained by centrifugation are dispersed in water, to form gold nanoparticles dispersion solution.Step 2, after centrifugation, gold nanoparticles dispersion solution is added into mercapto end-capped polystyrene tetrahydrofuran solution, and is placed for 6-8h, then centrifugation is carried out, and the bottom precipitate is dispersed in chloroform, then the dispersion solution is added dropwise to the surface of water, and self-assembly is formed into two-dimensional film.The two-dimensional film is stable in water system photocatalytic conversion organic pollutant reaction, and has high photocatalytic efficiency, and catalyst is easy to recycle and use.

The invention provides high-adhesion ultraviolet curing glue and a preparation method thereof, and the high-adhesion ultraviolet curing glue comprises the following components by mass: 4-90% of an oligomer, 0-40% of a photocuring monomer, 0.05-10% of a photoinitiator, 0.05-10% of a leveling agent, and 30-90% of a titanium oxide nanoparticle dispersion liquid or a zirconium oxide nanoparticle dispersion liquid. And the oligomer adopts a polyurethane acrylate polymer with a hydroxyl value of more than or equal to 50. According to the present invention, 4-90% by mass of the oligomer is added to the glue, and the oligomer adopts the urethane acrylate polymer with the hydroxyl value of more than or equal to 50, such that the polarity of the polyurethane material is weakened through the large amount of the hydroxyl contained in the oligomer so as to improve the adhesion of the ultraviolet light curing glue to the waveguide substrate adopting the polyurethane material.

The invention relates to the field of photocatalytic nanoparticle dispersion, and discloses a photocatalytic nanoparticle dispersion process for an organosilicon antibacterial material, which comprises the following steps: S1, providing nitrogen-doped titanium dioxide and copper oxide as composite photocatalytic nanoparticles, the doping amount of the nitrogen-doped titanium dioxide, the particle size of the copper oxide and the compounding ratio of the nitrogen-doped titanium dioxide and the copper oxide are accurately controlled; s2, carrying out surface modification on the composite photocatalytic nanoparticles by adopting a silane coupling agent; s3, mixing the surface-modified composite photocatalytic nanoparticles with an organosilicon prepolymer, and carrying out mechanical dispersion by adopting a high-shear double-planet stirring and high-power ultrasonic-assisted dispersion technology; and S4, optimizing the ratio of the composite photocatalytic nanoparticles, the dosage of the silane coupling agent and the dispersion time parameter by using a response surface analysis method. Compared with the prior art, the preparation method has the advantage that the problems of poor dispersity, weak visible light response and low carrier separation efficiency of nano particles in the prior art are solved.

The invention relates to a process (10) for manufacturing an alloyed metal powder strengthened by a dispersion of ceramic nanoparticles, the powder comprising spherical metal particles forming a metal matrix and ceramic nanoparticles distributed in the metal matrix, the process comprises: introducing a precursor alloy metal powder intended to form a metal matrix into a fluidization chamber (E1) of a fluidized bed reactor; injecting at least one fluidizing gas into the fluidizing chamber at a defined injection flow rate such that the powder particles are suspended and separated into individual particles (E2, E3) under the action of a drag force exerted by the gas in the chamber; the metal powder particles suspended in the gas stream are heated to a defined heating temperature and heating duration to produce a formation of ceramic nanoparticles on the metal particle surface and inside the metal particles (E4).

The invention relates to the technical field of functional materials and surface engineering, and particularly provides a photo-thermal super-hydrophobic anti-icing and deicing coating with excellent durability and a preparation method of the photo-thermal super-hydrophobic anti-icing and deicing coating. The method comprises the following steps: coating the surface of a pretreated base material with epoxy resin to obtain an epoxy resin layer; silicon carbide particles are embedded into the epoxy resin layer through electrostatic sand planting, an armor layer is obtained, and then a curing reaction is carried out; and spraying a modified titanium nitride nanoparticle dispersion liquid on the surface of the cured armor layer, and drying to obtain the photo-thermal super-hydrophobic anti-icing and deicing coating with excellent durability. The surface of the coating has a high water contact angle (CA) of 164 + / -1.6 degrees, a low water sliding angle (SA) of 1.6 + / -0.5 degrees and a high sunlight absorptivity of 0.988, and the coating can bear 1000 times of adhesive tape stripping tests, 50 times of abrasive paper abrasion tests under the pressure intensity of 3 kPa, seven days of ultraviolet lamp irradiation with the intensity of 20 W and 150 DEG C high-temperature stability tests.

The invention discloses an electrocatalysis-based SRB bacterium rapid determination sensing material and a preparation method and application thereof. The preparation method comprises the following steps: adding polyvinylpyrrolidone and polyethylene glycol into a copper nitrate salt solution, and carrying out ultrasonic treatment until powder is completely dissolved; under magnetic stirring, rapidly injecting hydrazine hydrate into the mixed solution, and reacting at normal temperature for a period of time to obtain Cu2O nanoparticles; and adding a HAuCl4 solution into the Cu2O nanoparticle dispersion liquid, continuously stirring, and carrying out in-situ replacement to obtain the Cu2O coated Au hollow nanostructure loaded with Au nanoparticles. The hollow and open conductive metal-metal oxide heterogeneous nanostructure is synthesized through an Ostwald curing process, and the hollow and open conductive metal-metal oxide heterogeneous nanostructure is used as a rapid detection sensing platform for sulfate reducing bacteria based on electrocatalysis and has a wide research prospect in the aspect of rapid detection of microorganisms.