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1351results about How to "Good dispersion" patented technology

Preparation of nano-cerium oxide composite abrasive grain polishing solution

The invention discloses a method for preparing nano cerium oxide composite abrasive particle polishing solution. The method is characterized by taking inorganic abrasive particles as the inner core and a cerium oxide coating as the shell to form the nano cerium oxide composite abrasive particle polishing solution with a core/shell structure, and belongs to the high-precision polishing material preparation technique technical field. The preparation process of the polishing solution is as follows: firstly, the nano cerium oxide composite abrasive particles are prepared by the homogeneous precipitation method; secondly, the polishing solution is prepared through the cerium oxide composite abrasive particles. During the preparation process of the polishing solution, the weight percent of the cerium oxide composite abrasive particles and water is between 2 and 10 percent, and 0.5 to 2 percent of dispersant is added; after further ultrasonic dispersion or ball milling dispersion of mixture, uniform dispersion liquid is formed; and the nano cerium oxide composite abrasive particle polishing solution is obtained after addition of 0.5 to 5 percent of oxidant, 0.05 to 0.1 percent of corrosion inhibitor and 0.05 to 0.1 percent of lubricant (the addition of various materials takes 100 percent of water as the reference basis). The polishing solution is represented by low surface roughness and scratch level, and then an ultra-smooth surface is obtained.
Owner:SHANGHAI UNIV

Preparation method of single-crystal-morphology lithium ion battery ternary positive material

ActiveCN104979546AGood dispersionOvercoming the problem of easy reunificationCell electrodesLithium electrodeOxide
The invention discloses a preparation method of a single-crystal-morphology lithium ion battery ternary positive material. The method comprises the following steps: (1) preparing an inflorescence-shaped ternary positive material precursor particles by clustering lamellar primary particles in a coprecipitation method, wherein the D50 of the precursor particles is 2-5micron, the BET is more than 100m<2>/g, and the valences of nickel, cobalt and manganese are +2; (2) mixing a precursor obtained by adopting the coprecipitation method with auxiliaries to obtain a mixture 1, and performing high-temperature sintering on the mixture 1 at the temperature between 600-950 DEG C so as to obtain a round-likely roundness type oxide; (3) mixing the round-likely roundness type oxide precursor obtained by the high-temperature sintering with a lithium salt so as to obtain a mixture 2, and performing sintering on the mixture 2 at the temperature between 700-1000 DEG C so as to obtain a product; and (4) dispersing the product obtained by sintering in the step (3), and performing heating treatment on the dispersed product at the temperature between 780-1000 DEG C so as to obtain the single-crystal-morphology lithium ion battery ternary positive material. The prepared positive material is made from the uniform single-crystal primary particles with good dispersibility, and the problem that the primary particles are easy to cluster in the high-temperature sintering process in a conventional method can be effectively overcome.
Owner:CONTEMPORARY AMPEREX TECH CO

Preparation method of cerium oxide nanoballs

The invention relates to a preparation method of cerium oxide nanoballs, and belongs to the technical field of the preparation processes of the inorganic nanomaterials. The key points of the method of the invention include: stirring and mixing cerium salt and a certain amount of surfactant at room temperature, dissolving the mixture in a mixed solution of water and an organic solvent and ultrasonically processing the mixture for 5 to 10 minutes, wherein the cerium salt is optimally cerium nitrate; the surfactant is most preferably polyvinylpyrrolidone; and the belonged organic solvent is most preferably diglycol; then transferring the mixed solution into a high pressure reaction kettle to perform a solvothermal reaction; heating the mixed solution to perform reaction for 24 to 28 hours at the temperature of 100 to 200 DEG C so as to obtain the cerium oxide nanoball sol; evaporating the sol at the temperature of 1500 o 180 DEG C to dryness; and forging the obtained powder for 1 to 4 hours at the temperature of 400 to 600 DEG C; and finally obtaining the cerium oxide nanoballs in the shape of yellow solid powder. The nanoballs have a particle size ranging from 30 to 160nm and high performance and can be applied in fields of ultraviolet light shielding, mechanical polishing and automobile exhaust catalyzation and the like.
Owner:SHANGHAI UNIV

Catalyst for preparation of ethanol through acetic acid hydrogenation and preparation method thereof

The invention relates to a catalyst for preparation of ethanol through acetic acid hydrogenation and a preparation method thereof, and provides a catalyst for preparation of ethanol through acetic acid hydrogenation, which is environment-friendly, mild in conditions, excellent in catalysis performance and high in stability, and a preparation method thereof. The catalyst comprises the following components in percentage by mass: 0.5-2% of platinum, 0.5-6% of tin and the balance of carrier; and the composition of the catalyst is expressed as x%Pt-y%Sn/carrier, wherein x% represents the mass percent of Pt in the catalyst, y% represents the mass percent of Sn in the catalyst, and the carrier is silicon carbide or carbon nanotube. The preparation method of the catalyst comprises the following steps: mixing surfactant sodium lauryl sulfate with the platinum and tin components; then adding the carrier; performing liquid-phase reduction to prepare a catalyst precursor; and roasting the catalyst precursor under the air atmosphere to obtain the supported platinum-tin bimetallic catalyst for acetic acid hydrogenation. The invention has the advantages of simple preparation process and good repetitiveness, and is easy to implement scale-up production.
Owner:XIAMEN UNIV +1

Magnetic mesoporous silica composite microsphere with Yolk-Shell structure and manufacturing method thereof

The invention belongs to the technical field of advanced nano materials, and particularly relates to a magnetic mesoporous silica composite microsphere with a Yolk-Shell structure and a manufacturing method of the magnetic mesoporous silica composite microsphere. Firstly, a sol-gel chemical synthesis method is adopted, and a magnetic nanoparticle is coated with a macromolecule layer of amorphous silicon dioxide and a macromolecule layer of polymer resin in sequence; then the self-assembling behavior of organic surface active agents as structural guiding agents and inorganic substances in solutions is utilized, and the magnetic nanoparticle is coated with a layer of silicon dioxide/surface active agent composite materials with an ordered mesostructure; the surface active agents and the macromolecule layers are removed through roasting, and then the materials of the magnetic mesoporous silica composite microsphere with the Yolk-Shell structure are obtained. The composite microsphere is provided with a large adjustable cavity, a high specific surface area and mesoporous shell layers evenly perpendicular to an interface, has magnetic responsiveness strong in stability, and has wide application prospects in nanoreactors, drug sustained release, high-capacity bioseparation and absorption. The method is simple, raw materials are easy to obtain, and amplification production can be achieved.
Owner:FUDAN UNIV

Mn-Ce supported low temperature denitration catalyst and preparation method thereof

The invention discloses a Mn-Ce supported low temperature denitration catalyst and a preparation method thereof. The catalyst is mainly composed of cerium nitrate hexahydrate, urea, PAA, potassium permanganate, manganese nitrate, and glacial acetic acid; and is prepared by the following steps: preparing a cerium dioxide carrier and loading active components on the carrier through hydrothermal deposition. Common chemical reagents such as cerium nitrate, urea, and the like are used to prepare the nano cerium dioxide catalyst; the preparation process is simple and controllable; compared with the cerium dioxide purchased in the market, the catalyst has the advantages of good dispersing property, small particles, larger specific surface area, better oxygen storing and releasing ability, and strong antitoxin performance; the neutralization reactions between potassium permanganate and manganese nitrate are utilized, cerium dioxide is taken as the substrate to carry out redox reactions to obtain a mixture precipitate of manganese oxides and cerium dioxide, and then the mixture precipitate is subjected to a post treatment to obtain the supported manganese-based low temperature denitration catalyst. According to the preparation method, only a hydrothermal method is adopted, the related technology is simple, the cost is low, and the efficiency is high.
Owner:WUHAN UNIV OF TECH

Composite binding agent applicable for silicon-based negative electrode material of lithium ion battery, preparation method of composite binding agent and negative electrode material

The invention relates to a composite binding agent applicable for a silicon-based negative electrode material of a lithium ion battery. The composite binding agent comprises a main binding agent and a matched binging agent, wherein the main binding agent is partially neutralized polyacrylic acid. With the partially neutralized polyacrylic acid proposed by the invention, the dispersibility of the composite binding agent is improved, moreover, the mechanical property and the processability of the composite binding agent are improved, and the electrochemical performance of the material is further favorably improved. The binding agent is a mixture of the main binding agent and the matched binding agent, the main binding agent is in an intermediate state of the polyacrylic acid and poly(lithium acrylate) and has performance superior to the polyacrylic acid and the poly(lithium acrylate), and the electrochemical performance of the silicon-based negative electrode material is remarkably improved; the matched agent is styrene-butadiene rubber; moreover, a few amount of lithium-containing raw material is consumed during preparation of the composite binding agent, the composite binding agent is relatively low in cost, is easy for industrialization, has certain lithium ion conductivity, and has relatively high market potential.
Owner:HUZHOU CHUANGYA POWER BATTERY MATERIALS

Fiber-reinforced ceramic matrix composite and preparation method for graphene/carbon nano-tube interface

The invention relates to a fiber-reinforced ceramic matrix composite and preparation method for a graphene/carbon nano-tube interface.The composite is structurally characterized in that a carbon fiber is wrapped by a carbon nano-tube, the carbon nano-tube is wrapped by graphene, and a Sic base body is arranged on the outermost layer.The deposit rate of the carbon nano-tube, the graphene and the Sic base body is regulated by regulating the solution concentration and deposition time, and the sequence and the number of layers of a 'carbon nano-tube/graphene' interface layer are designed by changing the deposition sequence and the number of deposition times.The introduced carbon nano-tube and graphene are good in dispersibility, the mass fraction is adjustable within a large scope, and the interface can be designed.An interface phase with the strength reasonable can be designed, and the effect of a fiber-reinforced body can be given to full play; secondary toughening can be conducted on the composite through CNT and the layered graphene, the pulling-out and bridging effects as well as the effect of deflecting cracks of the fiber, the CNT and the graphene can be given to full play, and mechanical properties of the composite are effectively improved.By means of the method, interface layer preparation time is short, efficiency is high, and design can be regulated.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Blocking thermoplastic polyurethane (TPU)/functional graphite oxide composite film and preparation method thereof

The invention discloses a blocking thermoplastic polyurethane (TPU)/functional graphite oxide composite film and a preparation method thereof. The method comprises the following steps: firstly, preparing graphene oxide by adopting an improved hummers method, and then carrying out organic modification on the graphite oxide by using different fluorine ketone diisocyanate to obtain functional graphite oxide; finally, compositely building a film on a film coating machine by using the functional graphite oxide and TPU. By adopting the composite material film prepared by the method disclosed by the invention, the functional graphite oxide can be evenly dispersed into a TPU substrate as a good impermeable material, so that the composite film has good ability of blocking small molecule materials such as vapor, oxygen and the like, the barrier property is greatly enhanced, the mechanical property is also definitely improved, the film is good in transparency, and he blocking TPU/functional graphite oxide composite film can be widely applied to the fields such as food packaging and drug packaging encapsulation materials and the like. The blocking TPU/functional graphite oxide composite film is scientific and reasonable in preparation method, simple in process, and strong in maneuverability, and industrial production can be carried out on a large scale.
Owner:福建宸琦新材料科技有限公司
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