10results about How to "Uniform size distribution" patented technology

The invention discloses a preparation method of an efficient light-emitting silver-indium-sulfur and silver-indium-zinc-sulfur composite nano material, and belongs to the technical field of light-emitting nano materials and preparation. The preparation method comprises the following steps: by taking silver dibutyl dithiocarbamate, indium dibutyl dithiocarbamate and zinc carboxylate as precursors, uniformly mixing at a dodecane neutralization pretreatment temperature to form a mixed solution A; naturally cooling, adding dodecanethiol, and uniformly stirring and mixing to obtain a mixed solution B; at the reaction temperature, decomposing part of silver dibutyldithiocarbamate in the mixed solution B to generate silver sulfide clusters; the activity of the silver sulfide cluster is closely related to the size, the silver sulfide cluster is used as a seed to induce growth of silver-indium-zinc-sulfur, meanwhile, silver sulfide is converted into silver-indium-sulfur, finally, the silver-indium-sulfur and silver-indium-zinc-sulfur composite nano material is obtained, the band gap is 2.0-2.8 eV, the luminous efficiency is 52% or above, and the luminous efficiency can still be kept at 78% or above after five months. The preparation process disclosed by the invention is low in raw material cost and good in process controllability.

The invention discloses cation modified nano graphene oxide and a preparation method thereof, the transverse size of the cation modified nano graphene oxide is 10-100 nm, the surface of the cation modified nano graphene oxide is non-covalently bound with organic quaternary ammonium salt cations through electrostatic interaction, and the organic quaternary ammonium salt cations are provided by a cationic surfactant. According to the invention, electrostatic interaction is combined with a quaternary ammonium salt cationic surfactant, and a hydrophobic long alkyl chain of the quaternary ammonium salt cationic surfactant is exposed outwards, so that the product can be stably dispersed in various organic solvents such as methanol, ethanol, acetone, ethyl acetate, N-methyl pyrrolidone (NMP), N, N-dimethylformamide (DMF), dichloromethane and the like; the limitation that traditional nano graphene oxide is only limited to a water phase is avoided, and the compatibility and application potential in the fields of polymer composite materials, oil paint, high-performance resin and the like are improved.

The invention discloses a method for continuously preparing a chiral enriched single-walled carbon nanotube by adopting a fluidized bed, and belongs to the technical field of carbon nanotubes. The method comprises the following steps: preparing a fluidized catalyst by a sol-gel method, mixing a metal catalyst salt, an inorganic sol carrier, a pore-forming template agent and an electrolyte gel to form gel, and drying and annealing to form the fluidized catalyst with the particle size of 50-200 microns and rich mesopores; the method comprises the following steps: reducing and activating a catalyst in a pretreatment reactor, introducing into a main reactor, introducing a carbon source gas and a carrier gas, and cracking and depositing a carbon source at an active center of the catalyst to grow a single-walled carbon nanotube; after the growth is finished, increasing the carrier gas flow and conveying a product to a cooling separator for collection; and after the main reactor is empty, the next batch of catalyst can be introduced without cooling to realize continuous preparation. According to the method, the catalyst metal is uniformly dispersed, the fluidization performance is excellent, the growth of multi-wall and large-diameter carbon nanotubes can be effectively inhibited, and the efficient and continuous preparation of the chiral enriched single-wall carbon nanotubes is realized.

This application discloses a bipolar molecularly co-modified perovskite nanocrystal and its preparation method. After nucleation of CsPbBr3 nanocrystals, zinc bromide and 1-naphthalenesulfonic acid (NSA) are introduced for post-treatment, resulting in dual passivation and physical coating of defect states on the nanocrystal surface. Zinc bromide provides excess Br. ‑ Zn fills surface halogen vacancies. 2+ Occupy Pb 2+ Vacancy suppression of deep-level defects; NSA's sulfonic acid group -SO3 ‑ As strong coordination sites, they replace and firmly anchor weakly bound oleic acid / oleylamine ligands to the surface, and their aromatic ring structure stabilizes the surface through cation-π interactions. Zinc bromide and NSA work synergistically to achieve efficient and deep passivation of surface defect states of CsPbBr3 nanocrystals. Perovskite nanocrystals exhibit high photoluminescence quantum yield, narrow fluorescence peak, and uniform size distribution, and are stably dispersed in organic solvents for a long time. The ligands on the nanocrystal surface are firmly bound, improving optical and structural stability, and the process is simple and efficient.

This invention belongs to the field of materials preparation and discloses a method for preparing plate-like zinc phosphate, comprising the following steps: (1) adding an inducing agent to a phosphoric acid solution; (2) adding the mixed solution from step (1) to a zinc oxide slurry, stirring the mixture at 60-90°C, and filtering and drying the reaction product after the reaction to obtain plate-like zinc phosphate. This invention directly controls the growth morphology of plate-like crystals through an aqueous synthesis reaction, eliminating the need for ultrafine grinding, reducing process flow and equipment investment, lowering energy consumption per unit product, and meeting the requirements of green manufacturing.

The invention discloses a double-nano low-density thixotropic cement paste system, relates to the technical field of oil and gas well drilling engineering, and solves the problem that the existing cement paste system is difficult to adapt to stratums with low pore pressure and serious leakage. The cement paste system comprises the following components in parts by weight: 40-60 parts of G-grade oil well cement, 14-25 parts of a solid lightening agent, 20-45 parts of a solid admixture, 3-6 parts of a solid thixotropic agent, 0.5-2 parts of a nano stabilizer, 1-3 parts of a nano early strength agent, 1-3 parts of a fluid loss agent, 0.5-1 part of a dispersing agent and 70-100 parts of water. The double-nano low-density thixotropic cement paste system has the characteristics of lower density, high thixotropy and short setting waiting time, can enable a cement paste body to effectively reside in a shaft when a lower-density cement plug is achieved, is high in thixotropy and quickly forms a gelling structure, is controllable in compressive strength, is beneficial to plug drilling, shortens the setting waiting time and saves the production cost, and is suitable for popularization and application. Therefore, the production purposes of efficiently plugging and improving quality and efficiency are achieved.

The invention discloses a preparation method and application of cobalt hydroxide based on seed crystal circulation and special active magnesium oxide. Through cooperation of a seed crystal circulation technology and a special auxiliary agent, the generated cobalt hydroxide is converted into a core of subsequent crystal growth, uniform and thick growth of the cobalt hydroxide is guided, and the industry bottleneck that the underflow concentration of a thickener is low when high-activity magnesium oxide is adopted for cobalt precipitation is effectively solved. The average particle size (D50) of the product is increased from 16.81 [mu] m to 21.81 [mu] m or above, the underflow concentration is increased from 27% to 28-30%, and the sedimentation and compaction performance of ore pulp is remarkably improved. While excellent physical properties are obtained, the chemical quality of the product is excellent, the cobalt content reaches 40% or above, and the magnesium residue is lower than 5%. The process economy is outstanding, the cobalt precipitation rate is increased to 98% or above, and the unit consumption of magnesium oxide is reduced to 0.70-0.71 t / t Co. According to the method, the seed crystal derives from the process, parameter regulation and control are flexible, compatibility with an existing production line is good, and large-scale industrial application prospects are achieved.

This invention discloses a nanocomposite phase change antifreeze water-reducing agent and its preparation method, comprising water and the following components in parts by weight: 5-8 parts polycarboxylate superplasticizer mother liquor, 6-10 parts ethylene glycol, 8-10 parts calcium formate, 2-4 parts sodium nitrite, 5-8 parts methanol, 2-5 parts sodium metasilicate, 1-2 parts sodium thiocyanate, 0.3-0.6 parts air-entraining agent, 6-8 parts modified nano titanium dioxide, and 8-10 parts ternary phase change material. This nanocomposite phase change antifreeze water-reducing agent is a composite functional admixture that introduces nanomaterials and phase change materials into traditional antifreeze water-reducing agents. It not only prevents concrete from freezing at low temperatures but also regulates the internal temperature changes of concrete through "phase change" characteristics, thereby improving the durability of concrete under freeze-thaw cycles.

The utility model relates to the technical field of coating particle screening, and discloses a coating particle fine screening structure which comprises a bottom plate, the top of the bottom plate is fixedly connected with a supporting frame, the top of the supporting frame is fixedly connected with a screening mechanism, and the top of the bottom plate is fixedly connected with a pipeline blocking prevention mechanism. The screening mechanism comprises a driving assembly, the top of the bottom plate is fixedly connected with a classified collection assembly, the classified collection assembly is fixedly connected with a supporting semicircular block, the top of the supporting semicircular block is fixedly connected with a screening barrel, and the interior of the screening barrel is rotationally connected with a drainage assembly. The bottom of the screening barrel is fixedly connected with a first screening net, and the bottom of the screening barrel is fixedly connected with a second screening net. According to the device, coating particles with different sizes are separated out through the first screening net, the second screening net and the third screening net which are different in number and enter the collection box distinguished by the classification plate, and the coating particles with different particle sizes are finely screened and collected in a classified mode.

The application discloses a preparation method of carbon sphere loaded small-size platinum group metal nanoparticles. The method comprises the following steps: adding a dopamine hydrochloride solution into a mixed solution of ethanol, water and ammonia water, stirring and reacting to prepare polydopamine microspheres, adding a ruthenium ion salt and a platinum group metal ion salt, stirring to enable the polydopamine microspheres to fully adsorb the ruthenium ion and the platinum group metal ion, and finally calcining the polydopamine microspheres with the adsorbed metal ions in an inert atmosphere at high temperature to prepare the carbon sphere loaded small-size platinum group metal nanoparticles. The carbon sphere loaded platinum group metal nanoparticles prepared by the method have small size, uniform distribution and an average particle size of 2-3 nm. The method is simple, suitable for preparation of various small-size platinum group metal nanoparticle materials and easy for large-scale production.