10 results about "Nanoparticles dispersion" patented technology

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 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 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.

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.

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 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 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.