57 results about "Nanoparticles dispersion" patented technology

The invention provides a method for optimizing the mechanical property of a bio-based composite material based on nano modification, and belongs to the technical field of high-molecular compound compounds.The method includes the steps that wood flour is subjected to silane coupling agent modification pretreatment, a functionalized nano particle dispersion liquid is prepared, the dispersity is evaluated through a graph theory model, and the mechanical property of the bio-based composite material is optimized. The modified wood flour and polyethylene are subjected to melt blending in a twin-screw extruder in proportion, the functionalized nanoparticle dispersion liquid is synchronously added, real-time regulation and control are performed by using an intelligent dispersion optimization model, and the network structure integrity is evaluated through gridding performance indexes. The tensile strength, the bending strength and the impact strength are comprehensively optimized by adopting a multi-objective optimization game model, the process parameters such as the nano-particle addition amount, the mixing temperature and the mixing time are adjusted according to the optimization result, and the optimization is repeated until the preset target values are reached, so that the problems that the nano-particles are non-uniformly dispersed, local stress concentration points are formed, and the stability of the nano-particles is improved are solved. The overall mechanical property is influenced.

The invention discloses a preparation method of a hydrophilic / hydrophobic SiO2 transparent high-adhesion wear-resistant super-hydrophobic coating for sandstone cultural relics. The preparation method comprises the following steps: 1, preparing hydrophilic SiO2 nanoparticles; 2, preparation of hydrophobic SiO2 nano particles; and 3, dispersing the hydrophilic / hydrophobic SiO2 nanoparticles prepared in the step 1 and the step 2 in an organic solvent, stirring and dispersing uniformly, adding a PDMS-CA mixture composed of polydimethylsiloxane and a curing agent, spraying the mixed liquid on the surface of a sandstone cultural relic, performing heat treatment, repeating the steps for several times, and drying at room temperature to obtain the hydrophilic / hydrophobic SiO2 transparent high-adhesion wear-resistant super-hydrophobic coating. A small amount of hydrophilic SiO2 nanoparticles are spontaneously attached to the surface of sandstone, are tightly linked with the sandstone through hydrogen bonds, and can form a stable rigid-flexible composite skeleton with polydimethylsiloxane to dissipate energy; the hydrophobic SiO2 nanoparticles are spontaneously close to the outer surface of the sandstone, so that the super-hydrophobicity of the coating is ensured; the prepared coating has transparency, super-hydrophobicity and mechanical durability.

The invention belongs to the technical field of spinning, and relates to a method for reducing PET melt spinning pressure on the premise of low damage to fiber performance. The silicone with specific content, specific structure and specific molecular weight is introduced into the PET melt in the form of master batch, so that the pressure of a spinning component can be remarkably reduced, and the intrinsic viscosity of the PET body and the mechanical property of the fiber can be maintained as much as possible on the premise of not changing the main chain structure of the PET, not changing the molecular weight of the PET body and not depending on the dispersion of nano particles.

The present disclosure discloses an organic silicon nano-precursor medium transmission inhibitor and its preparation method and use. The organic silicon nano-precursor medium transmission inhibitor is composed of an organic silicon and its derivatives, a catalyst, a dispersant, a stabilizer, a surfactant, and water. The organic silicon nano-precursor medium transmission inhibitor in-situ generates nanoparticles during a hydration process. The nanoparticles not only have a hydrophobic function, but also can effectively fill the pores of the concrete, which effectively solves a problem in which a hydrophobic material in a state of full water cannot reduce the diffusion of an erosive medium. The problems such as uneven dispersion and poor stability of nanoparticles added can be effectively solved by in-situ generating the nanoparticles, thereby effectively improving the ion corrosion resistance performance of the concrete.

The invention discloses dispersed modified nanoparticles, a preparation method thereof, a hardening coating liquid and a hardening coating. The method comprises the following steps: S1, surface ammonification modification of the nanoparticles; S2, dispersion treatment of a composite dispersant; S2-1, preparation of the composite dispersant; and S2-2, uniformly dispersing a composite dispersant in an acrylic monomer, grinding, adding the surface ammoniation modified nanoparticles prepared in the step S1, and grinding and dispersing to obtain the modified nanoparticle dispersion liquid. Through multiple synergistic effects of particle surface modification, composite dispersant preparation and dispersion process matching, stable and uniform dispersion of nanoparticles in an acrylic monomer is realized; the coating hardness strengthening agent is applied to coating hardness strengthening, so that the hardness of a coating is remarkably improved, and meanwhile, good adhesive force and other mechanical properties are kept; and the preparation method provided by the invention is simple in process, is suitable for various matrix materials and coating systems, and has a wide application prospect.

The invention discloses a high-refractive-index high-temperature-resistant epoxy acrylic photo-thermal curing composition, and relates to the technical field of adhesives. The coating comprises an epoxy-acrylic acid derivative, an inorganic nanoparticle dispersion liquid, a photoinitiator, a thermal initiator and an additive. According to the system, an inorganic nanoparticle dispersion liquid and an epoxy-acrylic acid derivative are uniformly mixed, and the epoxy-acrylic acid photo-thermal curing glue with high refractive index and high temperature resistance is prepared by optimizing the proportion of each component and regulating and controlling the component and proportion of the epoxy-acrylic acid derivative. The high-refractive-index glass adhesive has the advantages of high refractive index, low viscosity and favorable bonding strength for glass bonding; the problems that the pure light curing process of the existing high-refractive-index optical element and optical electronic element is not complete, the dark area is not cured and the like can be solved; the cured high-refractive-index epoxy acrylic adhesive layer is free of obvious cracking and embrittlement after being baked at the high temperature of 220 DEG C for two hours, and has excellent temperature resistance.

The present invention discloses a preparation method and application of a polymer polylactic acid nanocomposite material based on a copper-lutetium metal organic framework (Cu-LU) metal organic framework (MOF), belonging to the technical field of polymer composite materials. The method comprises the following steps: first, adding polylactic acid to dioxane to prepare a uniform polylactic acid solution; second, dispersing copper-lutetium metal organic framework (MOF) nanoparticles in dioxane to prepare a uniform dispersion of the Cu-lutetium metal organic framework (MOF) nanoparticles; third, adding the Cu-lutetium metal organic framework (MOF) nanoparticle dispersion obtained in step two to the polylactic acid solution obtained in step one, stirring at 60°C for 1 hour, obtaining a uniform film-forming solution for later use; and fourth, pouring the film-forming solution obtained in step three into a flat-bottomed glass dish and drying it to obtain a polylactic acid nanocomposite film having both antibacterial and ammonia-responsive functions. The present invention utilizes the above preparation method to obtain a polymer polylactic acid nanocomposite material having excellent water vapor barrier, mechanical strength, UV shielding, blue light shielding, and ammonia-responsive color change properties.

The present invention relates to the field of nanomaterial processing and dispersion, and discloses a two-phase shear nanoparticle dispersion method, which mainly comprises the following steps: uniformly mixing the nanomaterial to be dispersed, a liquid working fluid, and a dispersant; cooling the mixture loaded into a tubular mold, and liquefying a small amount of the working fluid in the contact area between the solid mixture and the outer surface of a friction disk to form an extremely thin liquid film, which will form an extremely high shear flow field and exert a strong deagglomeration effect on the nanoparticles contained in the liquid film.

The invention discloses an organic-inorganic complex nanoparticle as well as a preparation method and application thereof.The nanoparticle is obtained by performing rapid reaction and assembly on metal alcoholate, an organic ligand and water in a mixing cavity through an instantaneous nano-precipitation technology, and the organic-inorganic complex nanoparticle with zirconium oxide as a core and zirconium oxide as a core is obtained. Organic-inorganic complex nanoparticles of organic ligands with specific structures are wrapped on the peripheries of the organic-inorganic complex nanoparticles through chemical bonding. The invention also discloses a composition formula containing the organic-inorganic complex nanoparticles and a patterning method. The nano particles are good in dispersity, uniform in size and high in batch stability, solubility change can be generated in the ultraviolet band to the extreme ultraviolet band and under electron beam irradiation, and patterning processing can be achieved without an additional photosensitizer.

The present invention provides a dispersant for metal nanoparticles that can impart dispersion stability to metal nanoparticles, and a dispersion of metal nanoparticles that exhibits excellent dispersion stability and storage stability. [Solution] A dispersant for metal nanoparticles containing (A) a fatty acid having 16 carbon atoms and a cis double bond at the 9th position, and (B) a fatty acid having 16 carbon atoms and a trans double bond at the 9th position, wherein the content ratio of component (A) to component (B) [(A):(B)] is 99.99:0.01 to 60:40 by mass ratio. Alternatively, a dispersion of metal nanoparticles surface-modified with the dispersant.

The application relates to a capillary-based semiconductor SERS active substrate and a preparation process method thereof, and belongs to the technical field of environmental science detection. The capillary-based semiconductor SERS active substrate is a capillary-based semiconductor SERS active substrate based on semiconductor ZnO@ZIF-8. ZnO@ZIF-8 nanoparticles are dispersed in an ethanol solution of 4-MBA, stirring is carried out, the obtained ZnO@ZIF-8 / 4-MBA sample is flushed to remove free 4-MBA molecules on the surface of the ZnO@ZIF-8 nanoparticles; the purified ZnO@ZIF-8 / 4-MBA is again dispersed in an ethanol solution; the solution obtained in step 1 is injected into a capillary, drying is carried out, and the ZnO@ZIF-8 / 4-MBA is attached to the inside of the capillary. The operation method is simple and efficient.

Provided is a nanoparticle dispersion liquid which has a long life and excellent light durability while maintaining a high photoluminescence quantum yield (PLQY) by adding a light stabilizer that has excellent radical scavenging ability to a metal halide perovskite that forms luminescent nanoparticles.　This nanoparticle dispersion liquid is characterized by containing a metal halide perovskite, a light stabilizer, and a nonpolar organic solvent, and the light stabilizer includes at least one of a hindered amine skeleton represented by general formula (1) and a phenol skeleton represented by general formula (2). (In general formula (1), R1 is at least one selected from the group consisting of a hydrogen atom, an acyclic aliphatic hydrocarbon group, and an oxyl free radical group, R2 to R5 are each independently hydrogen or an acyclic aliphatic hydrocarbon group, and R6 is a hydrogen atom or an organic functional group.) (In general formula (2), R7 to R11 are each independently hydrogen or an organic functional group.)

This invention relates to nanoparticle dispersants, methods for preparing the same, and aqueous dispersions of stable nanoparticles containing the dispersant. Specifically, the dispersant is suitable for dispersing nanoparticles and comprises an amphiphilic polymer having an amine-containing backbone and UV-photocrosslinkable functional groups covalently bonded to the backbone, and further comprising hydrophilic polyether segments and / or hydrophobic organic segments. The aqueous dispersion comprises a photocrosslinked nanoparticle dispersant and nanoparticles.

The invention belongs to the technical field of super-hydrophilic coatings, and particularly relates to a mixed super-hydrophilic self-cleaning coating and a preparation method thereof. The self-cleaning coating is prepared from the following raw materials: 40 to 60 weight percent of modified silicon dioxide sol and 40 to 60 weight percent of nano particle dispersion liquid, the nano particle dispersion liquid comprises 7.5 to 9 weight percent of nano titanium dioxide, 1 to 2.5 weight percent of rod-shaped hollow nano silicon dioxide and the balance of water; the rodlike hollow nano silicon dioxide is prepared by the following steps: by taking a nano cellulose crystal as a template and silicate ester as a precursor, preparing a silicon dioxide coated nano crystal cellulose compound through a base catalysis sol-gel method and freeze-drying, and then calcining to prepare the rodlike hollow nano silicon dioxide. The modified silicon dioxide sol is prepared by taking silicate ester as a precursor and a hydroxy sulfonic acid compound and alkoxy-terminated polydimethylsiloxane as modifiers through an acid catalysis sol-gel method; and after the coating is cured, the coating is small in contact angle, high in hardness, high in light transmittance and good in wear resistance.

The application discloses a kind of plasma enhanced Z type Ag2MoO4 / Ag / In2S3 photocatalyst and its preparation method and application, its preparation method includes Ag2MoO4 nanoparticle is dispersed into AgNO3 solution, under light condition, magnetic stirring is carried out, centrifugal, take sediment, after washing, drying, fully ground, obtain Ag2MoO4 / Ag nanoparticle;Ag2MoO4 / Ag nanoparticle and In2S3 nanoparticle are mixed and dissolved in anhydrous ethanol, after stirring, centrifugal, take sediment, after washing, drying, fully ground, obtain Ag2MoO4 / Ag / In2S3 photocatalyst.1g / L Ag2MoO4 / Ag / In2S3 photocatalyst is irradiated by sunlight for 2h, and the degradation rate of tetracycline in seawater is as high as 98.14%.

This invention discloses a self-triggered thermoelectric catalytic nanoparticle material, its preparation method, and its application. The preparation method includes adding antimony salt, bismuth salt, tellurium salt, PVP, and sodium hydroxide solution to ethylene glycol and stirring to obtain a mixture. The mixture is then sealed and reacted at 220–240°C to obtain BST nanoparticles. The BST nanoparticles are placed in deionized water and hydrochloric acid solution is added. Then, the mixture is ultrasonicated and centrifuged to collect the precipitate. The precipitate is then washed and dispersed in deionized water to obtain a BST nanoparticle dispersion. Calcium chloride and PAA are dissolved in deionized water, and the BST nanoparticle dispersion is added dropwise under stirring and ultrasonicated. Hydrogen peroxide is added to the mixture and stirred. The mixture is then centrifuged, the precipitate is collected, and washed. The self-triggered thermoelectric catalytic nanoparticle material of this invention exhibits high specificity and strong targeting by triggering catalytic therapeutic effects in response to the tumor microenvironment.

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.

The application discloses an organic-inorganic complex nanoparticle and a preparation method and application thereof, the nanoparticle is prepared from metal alcoholate, organic ligand and water through instant nano precipitation technology in a mixing cavity to rapidly react and assemble, and the organic-inorganic complex nanoparticle with a zirconium oxide core and an organic ligand with a specific structure wrapped outside through chemical bonding is obtained. The application further discloses a composition formula containing the organic-inorganic complex nanoparticle and a patterning method. The nanoparticle disclosed by the application has good dispersibility, uniform size and high batch stability, can change solubility under ultraviolet to extreme ultraviolet wave bands and electron beam irradiation, and can realize patterning processing without additional photosensitizers.

The invention provides a preparation process of a computer nano peep-proof film, and relates to the technical field of computer film preparation. The preparation process of the computer nano peep-proof film comprises the following steps: mixing nano TiO2 and nano BN particles to form a mixed suspension, adding a PVP dispersant into the mixed suspension, and carrying out ultrasonic dispersion to obtain a nano particle dispersion liquid; dissolving PET in dichloromethane to prepare a PET solution, slowly adding the nanoparticle dispersion liquid into the PET solution, uniformly stirring and dispersing, and then adding an ultraviolet light absorber and an antioxidant to obtain a peep-proof film precursor solution; a clean glass substrate is evenly coated with the peep-proof film precursor solution through a blade coating method, the glass substrate and the peep-proof film precursor solution are put into a vacuum drying box to be dried together, a nano peep-proof wet film is formed, and then heat treatment is conducted to form the nano peep-proof film. Through the synergistic effect of the nano TiO2 and the nano BN particles, the peep-proof film has good light shielding performance, screen content is effectively prevented from being peeped by the side face, and user information safety is protected.

The purpose of the present invention is to provide surface-modified copper nanoparticles which have high dispersibility and which have a reduced residual carbon concentration after being fired and a method which is for producing the surface-modified copper nanoparticles. Provided are surface-modified copper nanoparticles in which the surfaces of copper nanoparticles are modified with a silane coupling agent, wherein: each copper nanoparticle has, on at least a part of the surface thereof, a coating that contains a copper oxide; the number of surface groups that are on the surface of each surface-modified copper nanoparticle and that are derived from the silane coupling agent is more than 0.3 but less than 2.0 per square nanometer of the surface area of the surface-modified copper nanoparticle; and an average median diameter is not more than 0.2 μm as measured using a particle size distribution analyzer after the surface-modified copper nanoparticles are dispersed in ethanol.<sp / >

The application relates to a kind of photocatalytic materials and its preparation method and application, including (1) titanium salt solution and precipitant are mixed under stirring to pH is 2-3, then ultrasonic treatment is carried out, TiO2 Nanoparticle is obtained after drying, vacuum calcination;(2) the mixture is prepared by dispersing TiO2 Nanoparticle in anhydrous ethanol, active carbon fiber is treated in silane reagent, then is immersed in the mixture, after taking out, drying, calcination, photocatalytic material is obtained.The photocatalytic material prepared by the application has stable catalytic interface, and can maintain good catalytic effect and long-term use stability when used for high humidity VOCs gas treatment.

The present invention discloses a nano-composite material loaded with a quorum sensing inhibitor, its preparation method and application, belonging to the field of biomedical materials. Among them, the preparation method includes: dispersing MnO2 nanoparticles in an aqueous solution of polyallylamine hydrochloride to obtain a MnO2 / PAH complex; dispersing the MnO2 / PAH complex in an aqueous solution of polyacrylic acid for secondary modification; mixing the modified nanoparticles with a MgCl2 solution, and performing ultrasonic treatment and aging treatment to obtain a MnO2-Mg complex; using a chemical reduction method to in-situ grow platinum nanoparticles and load them on the surface of the MnO2-Mg complex to obtain MnO2-Mg / Pt; loading BBF on MnO2-Mg / Pt to obtain a MnO2-Mg / Pt@BBF nano-composite material. The purpose of the present invention is to enhance the chemodynamic efficiency, synergistically inhibit the biofilm effect, and achieve efficient treatment of periodontitis.

The application provides a kind of based on nanometer modified bio-based composite mechanical property optimization method, belongs to the technical field of polymer compound, the application is through the silane coupling agent modification pretreatment to wood powder, prepares functionalized nanoparticle dispersion liquid and uses graph theory model to evaluate dispersion, modified wood powder and polyethylene are proportioned in twin-screw extruder melt blending, simultaneously join functionalized nanoparticle dispersion liquid and utilize intelligent dispersion optimization model to carry out real-time control, through the grid performance index evaluation network structure integrity, uses multi-objective optimization game model to carry out comprehensive optimization to tensile strength, bending strength, impact strength, adjusts nanoparticle addition amount, mixing temperature, mixing time and other process parameters according to optimization result and repeats optimization until reaching preset target value, solves the technical problem that nanometer particle is not evenly dispersed, forms local stress concentration point, affects overall mechanical property.

To provide an antibacterial silver nanoparticle dispersion that exhibits superior antibacterial effect while maintaining superior dispersion stability.SOLUTION: The antibacterial silver nanoparticle dispersion of the present invention contains silver nanoparticles, a dispersant, and a polar solvent, wherein the silver nanoparticles have an average primary particle size of 20 nm or smaller and a secondary particle diameter (D50) of 200 nm or smaller, and the dispersant includes at least one selected from an alkylamine and an oxygen-containing amine, and also includes a nitrogen-containing organosilane compound.SELECTED DRAWING: None

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 relates to a preparation method of a novel metal-alloy heterostructure (Cu / Pt)-Cu nano particle, discloses a preparation method of a novel composite metal material Cu / Pt-Cu, and belongs to the technical field of nano material synthesis. The preparation method comprises the following steps: transferring a prepared copper salt solution, a prepared platinum salt solution and a prepared dispersing agent solution into water to prepare a metal precursor mixed solution; the preparation method comprises the following steps: adding a reducing agent solution into a mixed solution, heating in a water bath to a certain temperature, adding the reducing agent solution into the mixed solution in a stirring process, reacting for a period of time to finally obtain a suspension containing Cu / Pt-Cu nano particles, performing centrifugal separation and deionized water cleaning, and re-dispersing the suspension in deionized water to obtain a Cu / Pt-Cu nano particle dispersion liquid. The Cu / Pt-Cu nano particles synthesized by the method are distributed in the range of 30 nm to 90 nm, and are good in dispersity. The synthesis method is a water phase reaction, and has the advantages of low equipment requirement, simplicity in operation and short synthesis time.

The application relates to an antioxidant broad-spectrum sunscreen film and a preparation method thereof and relates to the technical field of biological materials. TiO2 and a dispersing agent are added into water, and the pH is adjusted to be alkaline; a cerium sulfate solution is added, then heating is carried out, CeO2 is obtained by hydrolysis of the cerium sulfate, and the CeO2 is deposited on the surface of the TiO2, TiO2@CeO2 nanoparticles are obtained; the TiO2@CeO2 nanoparticles, the dispersing agent and dopamine hydrochloride are added into water, the pH is adjusted to be alkaline, then heating is carried out, the dopamine is coated on the surface of the CeO2, and TiO2@CeO2@PDA nanoparticles are obtained; the TiO2@CeO2@PDA nanoparticles, polydimethylsiloxane, fumed silica, water, an emulsifying agent, a thickening agent, a preservative, hydroxyethyl cellulose and a catalyst are added into water, uniform mixing is carried out, vacuum is drawn, and an antioxidant broad-spectrum sunscreen film is obtained. The sunscreen film prepared by the application has strong antioxidant property, good biocompatibility and a broad-spectrum sunscreen effect.

To provide surface-modified copper nanoparticles with high dispersibility and reduced carbon residue concentration after firing, and a method for producing the same. [Solution] Surface-modified copper nanoparticles in which the surface of copper nanoparticles is modified with a silane coupling agent, wherein the copper nanoparticles have a coating containing copper oxide on at least a portion of their surface, and the number of surface groups derived from the silane coupling agent on the surface of the surface-modified copper nanoparticles is equal to the surface area of ​​the surface-modified copper nanoparticles per 1 nm. 2 Surface-modified copper nanoparticles having more than 0.3 particles but less than 2.0 particles per unit area, wherein the average median diameter measured using a particle size analyzer after dispersing the surface-modified copper nanoparticles in ethanol is 0.2 μm or less.

The present application relates to a kind of preparation methods for transmission electron microscope three-dimensional reconstruction sample, the method includes the following steps: nanometer particle dispersion liquid drop is added to porous membrane carrier net, and after air drying, carrier net is fixed on sample rod, the square grid of the porous membrane carrier net is 45 ° angle with the long axis direction of transmission electron microscope sample rod.By adjusting the position of carrier net in sample processing process, it can be guaranteed that although not in the area of carrier net center, sample is not blocked by carrier net when rotating sample rod, can expand sample selection area, so more nanoparticles are selected, improve measurement efficiency and three-dimensional reconstruction image quality.