38 results about "Nanoparticles dispersion" patented technology

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 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.

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 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 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.

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 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.

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.

This invention discloses a method for preparing a colorless and transparent polyimide composite film with a low coefficient of thermal expansion. The film is prepared in a solvent by combining polyamic acid and inorganic nanoparticles. The polyamic acid is synthesized by polycondensation of a rigid alicyclic dianhydride and a fluorinated aromatic dianhydride with a sulfone-containing aromatic diamine. The inorganic nanoparticles are zirconium tungstate nanoparticles. This invention uses a specific type of monomer to polymerize polyamic acid, and then disperses the added nanoparticles in an organic solvent for further composite preparation with the polyamic acid to form a polyimide film. This film has broad application prospects in semiconductor packaging processes, OLED displays, flexible solar cells, and other fields.

The application discloses a method for constructing a large-area superlattice monolayer film in one step based on a chemical cross-linking method and application thereof, and belongs to the technical field of nanomaterials. The method comprises the following steps: (1) taking mercapto polyethylene glycol as ligand A, and sequentially modifying gold nanoparticles by using the ligand A and 4-ATP; after activating the carboxyl group of 4-azido-2, 3, 5, 6-tetrafluorobenzoic acid, the 4-azido-2, 3, 5, 6-tetrafluorobenzoic acid is subjected to amidation reaction with the modified 4-ATP on the gold nanoparticles to generate ligand B, and then double-ligand modified gold nanoparticles are prepared; (2) dispersing the double-ligand modified gold nanoparticles in toluene, and then transferring the gold nanoparticles to a diethylene glycol subphase; after toluene is completely volatilized, a gold nanoparticle film is obtained on the diethylene glycol interface; and the gold nanoparticle film is subjected to ultraviolet irradiation treatment to obtain the large-area superlattice monolayer film. The method can realize controllable cross-linking between the gold nanoparticles, and the obtained superlattice monolayer film has a compact structure and good structural stability.

The present invention relates to a solid composition comprising nanoparticles of rifamycin, such as rifapentine, dispersed in a matrix comprising a first excipient and a second excipient. The invention also relates to microneedle arrays, implantable rods, aqueous dispersions and pharmaceutical compositions obtained from said solid compositions as well as their uses.

The application relates to the field of lamp lighting materials, in particular to a nano ZnO in-situ polymerized Rayleigh scattering PMMA light guide plate and a preparation method thereof. The preparation raw materials of the Rayleigh scattering PMMA light guide plate comprise 10-30 parts of MMA monomers, 0.1-0.3 parts of an initiator, 0.1-1 parts of modified nano ZnO particle dispersion liquid, 0.1-0.2 parts of an antioxidant and 0.01-0.1 parts of a light stabilizer according to mass fractions, wherein the preparation raw materials of the wet-state modified nano ZnO particle dispersion liquid comprise a ZnO precursor, a silane coupling agent, an alkali and a solvent. The Rayleigh scattering PMMA light guide plate provided by the application has natural light illumination characteristics and has a wide application prospect in the optical field.

This invention discloses a method and apparatus for preparing microcapsules with ultraviolet shielding function, comprising a synthesis step of a material with ultraviolet shielding function. In the synthesis of SiO2-coated TiO2 nanoparticles, TiO2 nanoparticles are dispersed in a mixed solution of ethanol, deionized water, and ammonia water, mechanically stirred and ultrasonically treated in a processing apparatus, and tetraethoxysilane dissolved in ethanol is added to the mixture. This invention ensures the long-term stability and durability of microcapsules by using a material with good durability and chemical stability as the microcapsule shell material, and improves the ultraviolet shielding effect and stability of microcapsules by adding a reinforcing agent with higher ultraviolet absorption capacity and photostability to the shell material, thereby extending the service life of the microcapsules and protecting the target substance from ultraviolet radiation for a longer period. By improving the preparation process of the microcapsule shell material, a more uniform ultraviolet shielding effect is achieved, ensuring a similar protective effect for each microcapsule and improving the overall ultraviolet shielding performance.

The invention discloses a method, a system and a device for predicting breakdown field strength of nano-modified cellulose insulation paper, and relates to the technical field of nano composite material characterization and modification of cellulose insulation paper for electrical equipment, and the method comprises the following steps: obtaining an electron microscope image of nano-modified cellulose insulation paper to be detected; classifying and identifying the nano particles and the cellulose matrix in the electron microscope image, performing binarization processing on the classification result image, and segmenting the adhered nano particles; counting the total number and coordinates of the nanoparticles in the electron microscope image; according to the total number and the coordinates of the nano particles, calculating a Sonderson index, a skewness value and a minimum neighborhood distance as nano particle dispersity indexes; according to the dispersibility index of the nanoparticles, quantitatively evaluating the dispersibility of the nanoparticles in the nano-modified cellulose insulation paper, and predicting the breakdown field strength of the nano-modified cellulose insulation paper; according to the method, the random dispersion and agglomeration states of the nanoparticles are effectively distinguished, and the accuracy of breakdown field strength prediction is improved.

The invention discloses a plasma enhanced Z-type Ag2MoO4 / Ag / In2S3 photocatalyst and a preparation method and application thereof.The preparation method comprises the steps that Ag2MoO4 nanoparticles are dispersed into an AgNO3 solution, magnetic stirring and centrifugation are carried out under the illumination condition, sediment is taken, washing and drying are carried out, sufficient grinding is carried out, and Ag2MoO4 / Ag nanoparticles are obtained; the preparation method comprises the following steps: mixing Ag2MoO4 / Ag nanoparticles and In2S3 nanoparticles, dissolving in absolute ethyl alcohol, stirring, centrifuging, taking precipitate, washing, drying, and fully grinding to obtain the Ag2MoO4 / Ag / In2S3 photocatalyst. When 1g / L of the Ag2MoO4 / Ag / In2S3 photocatalyst is irradiated by sunlight for 2 hours, the degradation rate of tetracycline in seawater is as high as 98.14%.

The invention discloses a preparation method of mixed insulating oil based on surface modified nanoparticles, relates to the technical field of insulating material production and processing, and solves the problems of poor heat-conducting property and insufficient dielectric strength of the existing vegetable insulating oil. Comprising the steps of preparation of nano ZnO, surface modification of nano ZnO, surface modification of nano SiC powder, preparation of mixed oil and preparation of mixed insulating oil, the dispersion stability of nano particles in the mixed insulating oil is improved, a large number of electron traps can be formed in the mixed insulating oil, migration of charged particles is reduced, and the dielectric property of the insulating oil is improved; the preparation method has the advantages of simple steps and good modification effect, is beneficial to industrial production and large-scale application of the mixed insulating oil, can meet the requirements of transformers on the heat-conducting property, insulating property and nanoparticle dispersion stability of the insulating oil, and solves the problem of poor dispersion stability of binary nanoparticles in the insulating oil.

The invention discloses a preparation method of an organic-inorganic hybrid nano ceramic marine heavy anti-corrosion coating, and belongs to the technical field of metal material protection. The method solves the technical problems of insufficient compactness and reduced protection performance of the existing marine heavy anti-corrosion coating caused by poor compatibility of an organic phase and an inorganic phase, non-uniform dispersion of nanoparticles and inaccurate control of a curing process. According to the technical scheme, the method is characterized by comprising the following steps: respectively preparing organic sol and inorganic sol by adopting propylene glycol methyl ether acetate as a uniform solvent, mixing the organic sol and the inorganic sol according to a mass ratio of (1-2): 1 to form hybrid sol, adding nano-zirconia into the hybrid sol, performing ultrasonic dispersion to obtain mixed sol, and finally coating the surface of a pretreated base material with the mixed sol through high-pressure airless spraying, so as to obtain the nano-zirconia-coated substrate. And coating curing is completed under the temperature programming condition. The coating prepared by the method is mainly used for long-term corrosion protection of carbon steel structures of ships, ocean platforms, port facilities and the like in an ocean environment.

The application belongs to the technical field of rare earth doped upconversion materials, and relates to a composite film with double-equivalent excitation induced upconversion enhancement and a preparation method and application thereof in the field of anti-counterfeiting. The application discloses a preparation method of a composite film with double-equivalent excitation induced upconversion enhancement, and the preparation method comprises the following steps: S1, preparation of MoO 3‑x nanosheets; S2, preparation of W 18 O 49 nanowires / MoO 3‑x nanosheets; S3, preparation of rare earth doped core-shell structure NaYF4 nanoparticles / W 18 O 49 nanowires / MoO 3‑x nanosheets; the rare earth doped core-shell structure NaYF4 nanoparticles are dispersed in a cyclohexane solution, and after being uniformly mixed, the rare earth doped core-shell structure NaYF4 nanoparticles are put into W 18 O 49 nanowires / MoO 3‑x nanosheets, and the composite film with double-equivalent excitation induced upconversion enhancement is obtained after heating and keeping warm. The application further discloses application of the composite film with double-equivalent excitation induced upconversion enhancement in the field of anti-counterfeiting, and the composite film with double-equivalent excitation induced upconversion enhancement emits light of different colors under different excitation powers of 980nm diode excitation.

This invention relates to the field of ceramic cold working technology, specifically to a stain-resistant material for soft-polished bricks and its application method. The stain-resistant material comprises modified high-modulus potassium silicate, a nanoparticle dispersion, and a matting material. The mass ratio of the modified high-modulus potassium silicate, the nanoparticle dispersion, and the matting material is (6-8):(1-3):(0.2-0.6). The modified high-modulus potassium silicate is obtained by modification with a silane coupling agent or organosilicon. The nanoparticle dispersion contains nanorod-shaped zinc oxide, additives, and water. The mass ratio of the nanorod-shaped zinc oxide, additives, and water is (20-30):(1-3):(50-60). The matting material is one or more of fumed silica and organic polymethyl urea resin nanospheres, addressing the current problems of poor stain resistance, insufficient stain resistance durability, and inadequate soft-light effect in soft-polished bricks.

The organic modified nanoparticles can be dispersed even with respect to a solvent having a relatively large molecular weight, so that the degree of freedom of solvent selection can be improved. The present invention is a method for dispersing organic modified nanoparticles in a solvent, the method comprising a dispersion step for dispersing organic modified nanoparticles having an organic modifying group on the surface in a solvent. The solvent contains a difficult-to-disperse solvent that is difficult to disperse with respect to the organic modified nanoparticles, and a prescribed molecule. The Van der Waals volume of the predetermined molecules at the temperature and pressure in the dispersion treatment step is smaller than the Van der Waals volume of the solvent and is also smaller than the Van der Waals volume of the organic modification group. The absolute value of the difference between the value of the organic modified nanoparticles under the pressure and the value of a predetermined molecule is 1.2 MPa1 / 2 or less and the difference between the value of the organic modified nanoparticles under the pressure and the value of a difficult-to-disperse mixed solvent containing the predetermined molecule is 1.2 MPa1 / 2 or less with respect to the dispersion force term [delta] D in the Hansen solubility parameter.