236results about "Cerium oxides/hydroxides" patented technology

The invention discloses a synthesis method of a hydrazine dicarboxylate modified cerium dioxide abrasive, and belongs to the technical field of precise polishing materials. The method comprises the following steps: taking cerous nitrate as a raw material, and preparing a cerous carbonate precursor through an ammonium carbonate precipitation reaction; and grinding and calcining the obtained precursor and hydrazine dicarboxylate to obtain the CeO2 grinding material with the surface rich in oxygen vacancies. And Ce < 4 + > can be partially reduced into Ce < 3 + > by reducing fragments generated by decomposition of the hydrazine dicarboxylate in the calcining process, so that an oxygen vacancy structure is formed through induction, and the chemical activity and the reaction rate of the abrasive are improved. The obtained grinding material shows excellent performance in chemical mechanical polishing (CMP) of K9 glass, the material removal rate (MRR) is increased by about 3.6 times compared with that of unmodified CeO2, the surface roughness (Ra) is reduced to about 0.16 nm or below, and grinding material particles are good in dispersity and less in agglomeration. The used hydrazine dicarboxylate is stable, low in toxicity and mild in reaction, and the particle size can be prevented from excessively growing while the high oxygen vacancy concentration is kept.

The invention discloses zwitterion co-doped CeO2 abrasive particles and a preparation method and application thereof.The preparation method includes the steps that a cerium source and a soluble carbonate precipitator are subjected to an aging reaction to obtain a cerium-based precursor, and the cerium-based precursor, fused salt, metal ions and a fluorinating agent are mixed and then roasted to obtain the zwitterion co-doped CeO2 abrasive particles; the synthesis method is simple, the size is controllable, the particle size distribution is uniform, and the spherical-like zwitterion co-doped CeO2 abrasive particles are obtained; the co-doped CeO2 abrasive particles have excellent photo-assisted chemical mechanical polishing performance; when the polishing solution prepared from the sphere-like co-doped CeO2 abrasive particles synthesized by the method is used for processing the surface of quartz glass, the material removal rate reaches 988.69 nm / min, and a high material removal rate is obtained due to the fact that the co-doped CeO2 abrasive particles synthesized by the two-step method shorten the forbidden bandwidth and have high chemical activity, so that the material removal rate is favorably improved.

The invention belongs to the technical field of air power supplies, and relates to modification treatment of an oxide, in particular to a cerium oxide doped transition metal oxide and a preparation method thereof, an air cathode and an air power supply. The preparation method comprises the following steps: dissolving cerium salt, cobalt salt and manganese salt in water, uniformly mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to 9-11, and carrying out a sedimentation reaction to obtain a sediment; and drying the precipitate, and calcining in an air atmosphere at 300 + / -10 DEG C for 2-4 hours to obtain the cerium oxide doped transition metal oxide. The cerium oxide doped transition metal oxide is cerium doped cobalt manganese oxide with a spinel structure, and the doping amount of cerium is 20 + / -1wt%. The cerium oxide doped transition metal oxide provided by the invention is applied to an air cathode as a catalyst, and has good stability and high catalytic activity. The performance of an air power supply containing the oxide is remarkably improved. The method for preparing the oxide provided by the invention is simple and easy to operate, and is suitable for large-scale production.

A polishing liquid for CMP, containing: abrasive grains; an additive; and water, in which the abrasive grains include cerium-based particles, a zeta potential of the abrasive grains is negative, the additive includes (A1) a 4-pyrone-based compound represented by General Formula (1) below, and a pH is 5.0 or more. A polishing liquid for CMP, containing: abrasive grains; an additive; and water, in which the abrasive grains include cerium-based particles, a zeta potential of the abrasive grains is negative, the additive includes (A2) a picolinic acid compound, and a pH is 5.0 or more.[In the formula, X11, X12, and X13 are each independently a hydrogen atom or a monovalent substituent.]

A polishing liquid for polishing undoped silicate glass, the polishing liquid having a pH of 3.0 or more. A polishing method including a step of polishing a surface to be polished of a member to be polished containing undoped silicate glass by using the above-described polishing liquid. A method for manufacturing a component, including obtaining a component by using a polished member polished by the above-described polishing method.

The invention belongs to the technical field of tungsten and tungsten products, and particularly relates to a doped tungsten oxide composite material and a preparation method and application thereof. The invention provides a method for preparing doped tungsten oxide by a chemical precipitation method, which comprises the following steps: dispersing two aqueous solutions in the form of tiny liquid drops in an atomization manner, and carrying out chemical reaction at the moment of contact and mixing, so that rare earth element cations are rapidly combined with hydroxyl anions in an alkaline environment; the preparation method comprises the following steps: adding ammonium paratungstate into an ammonium paratungstate precursor, quickly drying at high temperature, nucleating to obtain the doped ammonium paratungstate precursor, realizing uniform distribution of rare earth elements, and calcining at high temperature to obtain the doped tungsten oxide composite material with uniform particle size. The invention aims to provide a preparation method of a short-process doped composite material powder which can be efficiently industrialized and is uniform in nanoscale particle size.

The invention provides a spherical nano cerium oxide particle and a preparation method thereof, and a cerium oxide polishing solution and a preparation method thereof, and relates to the technical field of cerium oxide particle preparation, and the preparation method comprises the following steps: S1, adding an organic reducing acid into cerium carbonate micro powder to obtain an organic reducing acid cerium solution; s2, adding an organic weak base into the organic reduced acid cerium solution; adding an auxiliary reagent solution, and mixing to obtain a flocculent suspension containing the cerium element; s3, adding an organic modification reagent into the flocculent suspension containing the cerium element, then adding a reaction regulating agent, carrying out a heating reaction, and drying to obtain a crude product of particles containing the cerium element; and S4, carrying out high-temperature calcination on the cerium-element-containing particle crude product to obtain the spherical nano cerium oxide particles. The spherical nano cerium oxide particles prepared by the method are suitable for high-end chemical mechanical polishing liquid of semiconductor substrates or special glass, the preparation method is low in cost and simple in process, and no harmful gas is generated in the production process.

The invention discloses nano cerium oxide, a preparation method thereof and a polishing solution applying the nano cerium oxide, and aims to solve the problems of low purity, non-uniform particle size distribution, easy breakage of polishing powder and low polishing rate in the prior art. The average particle size of the nano cerium oxide is any value in a range of 15-100 nm, and the polydispersity index PDI of the particle size of the nano cerium oxide is less than or equal to 0.3. The nano cerium oxide is high in purity, narrow in particle size distribution and not easy to break, and is used for the polishing solution, so that the polishing efficiency and the surface quality of the chemical mechanical polishing solution are remarkably improved.

The present application relates to a kind of spheroidal doped ceria and its preparation method and application, the preparation method includes the following steps: after cerium salt, doped metal salt, solvent, acidic reagent and precipitant are mixed, hydrothermal reaction is carried out, and the precipitate is obtained, the precipitate is calcined, and the spheroidal doped ceria of the present application is obtained;The doped metal salt includes praseodymium salt and / or neodymium salt.The present application uses cerium salt and praseodymium salt and / or neodymium salt as doped metal salt as raw material, by the design of mixing process and reaction procedure and the selection of preparation process, the preparation of spheroidal doped ceria is realized, the doped ceria of nanometer level particle is obtained, and its appearance is regular and particle size is uniform, and, the preparation method used in the present application is simple, reaction time is short, and can be used for mass production.

The invention relates to the field of nano materials and photonic crystal materials, in particular to nano particles, preparation of the nano particles and application of the nano particles in self-assembly of three-dimensional non-close-packed photonic crystals. The nanoparticles can be self-assembled into a three-dimensional non-close-packed photonic crystal in a concentration range of 1 wt%-60 wt%. According to the invention, the problem that the self-assembly of the three-dimensional non-close-packed colloid photonic crystal is difficult to realize at low concentration at present is solved. By adjusting the mass fraction of the particles in a solution, the three-dimensional non-close-packed colloidal photonic crystal with rich colors can be formed through self-assembly, and the three-dimensional non-close-packed colloidal photonic crystal has wide application prospects in the fields of sensing, display and the like.

The invention belongs to the technical field of electrocatalytic materials, and discloses a CeO2 / NiCo2O4 heterojunction oxygen evolution reaction electrocatalyst and a preparation method thereof. According to the electrocatalyst, a composite protection layer composed of nitrogen-doped carbon quantum dots and CeO2 is constructed on the surface of a NiCo2O4 nanosheet array, cobalt ions are captured and dissolved out through pyridine nitrogen, reintegration is promoted through CeO2 oxygen vacancy, and interface dynamic self-repairing is achieved. And the nitrogen-doped carbon quantum dots are embedded into the CeO2 layer and are in direct contact with NiCo2O4 to synergistically inhibit cobalt loss and maintain structural integrity. By constructing the CeO2 / nitrogen-doped carbon quantum dot composite interface layer with dynamic ion capture and self-repairing capabilities, the problems of structure instability and performance degradation caused by cobalt ion dissolution of the NiCo2O4-based oxygen evolution reaction electrocatalyst under the working condition of strong oxidizing property are successfully solved; the method has important application value and industrialization prospect in the technical field of green hydrogen energy electrolyzed water.

The invention discloses nano cerium oxide synthesized based on a Taylor vortex reactor as well as a preparation method and application of the nano cerium oxide. The specific method comprises the following steps: dissolving cerium salt and a dispersing agent in water to form a reaction solution A, transferring the reaction solution A into a Taylor vortex reactor, dropwise adding an alkali solution, regulating and controlling the temperature of the Taylor vortex reactor and the material retention time to obtain a precursor, and burning out the precursor to obtain the cubic and / or rod-like nano cerium oxide. The cubic and / or rod-like nano cerium oxide prepared by the method has smaller particle size and better uniformity, and has wide application value.

The invention discloses a preparation method of a hydrogen fuel cell catalyst carrier. The preparation method comprises the following steps: 1) preparing a nitrogen-doped porous carbon core layer; 2) coating a CeO2 shell layer with the nitrogen-doped porous carbon core layer prepared in the step 1) to obtain a nitrogen-doped porous carbon CeO2 core-shell carrier; and 3) loading a Pt catalyst on the nitrogen-doped porous carbon CeO2 core-shell carrier in the step 2) to obtain the hydrogen fuel cell catalyst carrier. Through the collaborative design of nitrogen-doped porous carbon core layer anchoring, CeO2 shell layer blocking and mild hydrogen reduction loading, the Pt particle size is stably controlled within the range of 2-3 nm, Pt particle aggregation and curing are remarkably inhibited, the long-term activity stability of the catalyst is greatly improved, the particle size increase amount after 1000-hour operation and the 1000-hour activity attenuation rate (%) are remarkably reduced, and the catalyst has good application prospects. The technical problems that a traditional carbon-based carrier Pt is poor in dispersity and rapid in activity attenuation are solved.

The invention discloses a method for macroscopically preparing two-dimensional nanosheets based on an external field coupling technology, and belongs to the technical field of external field coupling and macroscopically preparing the two-dimensional nanosheets. Polyvinylpyrrolidone (PVP) is dissolved in absolute ethyl alcohol and stirred to form a uniform and transparent solution; adding acetone and metal precursor salt into the solution, and continuously stirring to obtain a uniform and stable precursor solution; carrying out gas jet spinning on the precursor solution through a needle head to obtain a composite nanosheet; and calcining the composite nanosheet in an air atmosphere to obtain the hierarchical porous metal oxide two-dimensional nanosheet. The method is convenient and efficient to operate, products are easy to obtain, macroscopic preparation can be achieved, and the green and environment-friendly production concept is met. According to the method, the fine structure of the two-dimensional nanosheet can be regulated and controlled by introducing a continuous air flow external field and only changing the three parameters of air pressure, the solution flow rate and the thickness of the needle head.

The application discloses a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure, which is a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure and is composed of a composite metal potassium-manganese, potassium-manganese-cerium and oxygen. The application applies a centrifugal spinning method to the preparation of a morphology of a hollow nanotube metal oxide catalyst and catalytic combustion of carbon smoke. In the preparation method, low-cost metal nitrate and metal acetate are selected as metal precursors, polyvinylpyrrolidone is used as a template agent, and a cerium-regulated potassium-manganese composite metal oxide catalyst with a hollow nanotube structure is obtained through dissolution-centrifugal spinning-drying-calcination. The preparation method can be applied to the preparation of various composite metal oxide catalysts and has the advantages of simple preparation process, strong practicability, high efficiency, low cost and easy realization of large-scale production.

Inorganic particles comprised in an aqueous dispersion according to the present invention consist of agglomerates of crystalline and amorphous microparticles, and exhibit spherical and smooth surfaces. The spherical appearance, low crystallinity, and narrow particle size distribution of the inorganic particles are further advantageous in reducing scratch defects in a CMP process. In addition, since the microparticles on the inorganic particle surfaces provide more active sites and thus the removal rate is high, the inorganic particles may be advantageous as next-generation CMP polishing materials. In addition, the aqueous dispersion according to the present invention further comprises an amino acid, and the amino acid may be adsorbed on a surface of a silicon oxide wafer to strengthen electrostatic attraction between the silicon oxide wafer and the inorganic particles, resulting in an effect of further improving the removal rate.

The invention discloses a nano cerium oxide composite proton exchange membrane and a preparation method and application thereof.The preparation method comprises the following steps that after a soluble cerium salt solution is sprayed and atomized, pyrolysis is conducted under the oxidizing atmosphere, and nano cerium oxide particles are prepared; then adding into a perfluorosulfonic acid resin solution, adjusting the pH value to be alkaline, and stirring to prepare a composite resin solution; and casting, drying to form a film, and carrying out heat treatment. Compared with the nano cerium oxide particles prepared by the traditional sol-gel method, the nano cerium oxide particles prepared by the spray pyrolysis method are more easily and uniformly dispersed in the perfluorosulfonic acid resin matrix and are not easy to agglomerate, and the basic structure of the perfluorosulfonic acid is maintained after the film is formed. Meanwhile, nano cerium oxide particles are dispersed in a perfluorosulfonic acid resin solution under an alkaline condition, so that the chemical stability and durability of the composite proton exchange membrane are improved, and the proton conductivity of the composite proton exchange membrane is improved.

The invention discloses a material reactor, a material reaction system, a method for decomposing a self-oxidation reduction precursor and application. The material reactor comprises a dividing piece and a reaction cylinder, adjusting the rotation of the reaction cylinder; the reaction cylinder is provided with a reaction cavity along the length direction; the dividing piece is placed in the reaction cavity; the dividing piece is provided with at least three dividing plates; one ends of the plurality of sub-plates are connected and are distributed in a surrounding manner by taking the connected position as the center; the other ends of the partial split plates are in contact with the inner wall of the reaction cavity; the material reaction system comprises a rack, a heating device, a feeding device, a discharging device and a material reaction system, according to the scheme, multiple synergistic effects of preventing adhesion, improving heat transfer and accelerating gas-solid reaction can be realized, and the problem of waste caused by the fact that gas decomposed by raw materials does not participate in synthesis and is directly discharged in a production process is solved.

The application discloses a composite material, an electrode loaded with the composite material and a preparation method. The application relates to the technical field of fluorine ion removal. The composite material comprises cerium oxide and carbon nanotubes coated on the cerium oxide. In the composite material, the cerium oxide has unique affinity to F ions, but the F removal capacity and kinetics of the cerium oxide are not satisfactory due to the limited conductivity. Therefore, the application develops a composite material, in which a structure of carbon nanotubes (CNT) tightly wrapping cerium oxide (CeO2) particles is formed, so that the conductivity of the material is greatly improved and the mass transfer resistance in the electric adsorption and desorption of fluorine ions is weakened.

The present invention provides cerium oxide particles for chemical mechanical polishing (CMP) and a chemical mechanical polishing slurry composition containing the same. The present invention provides a chemical mechanical polishing slurry composition that maximizes the silicon oxide / nitride selectivity during a shallow trench isolation (STI) polishing process while improving the oxide film polishing rate by combining the characteristic cerium oxide particles with a cationic polymer and a nitride film passivation modifier. The present invention also provides a method for manufacturing a semiconductor device using the same.

The invention provides a functional layer solid-phase precursor, a fuel electrode, a preparation method of the functional layer solid-phase precursor, a preparation method of the fuel electrode, a solid oxide fuel cell or an electrolytic tank, and belongs to the technical field of functional materials. The functional layer solid-phase precursor provided by the invention is obtained by solid-phase synthesis of raw materials including a NiO solid-phase precursor and first gadolinium-doped cerium oxide, and the mass ratio of the NiO solid-phase precursor to the first gadolinium-doped cerium oxide is (7-12): 1; the NiO solid-phase precursor is obtained by sol-gelation and first calcination of a mixed aqueous solution containing Ni salt, a pore forming agent and a chelating agent. The functional layer solid-phase precursor provided by the invention can be used for preparing a fuel electrode with high conductivity, and the fuel electrode is suitable for a solid oxide fuel cell or an electrolytic tank and has excellent electrochemical performance.

A chemical mechanical polishing composition for polishing a substrate having a silicon-oxygen material includes a liquid carrier, cubic abrasive particles dispersed in the liquid carrier, and at least one of an anionic compound and a nonionic compound.

To provide cerium oxide particles for chemical mechanical polishing and slurry compositions for chemical mechanical polishing containing the same, and a method for manufacturing the slurry composition for chemical mechanical polishing.SOLUTION: The surface of cerium oxide particles is characterized by the presence of Ce3+ and Ce4+, when using the cerium oxide particles in the present example, the high oxide film removal rate and oxide film polishing selectivity ratio can be demonstrated even in the low content range despite the fine particle size by increasing the ratio of Ce3+ on the cerium oxide surface.SELECTED DRAWING: Figure 1

The invention relates to cerium based core-shell particles having a core of cerium oxide optionally doped with at least one metal (M) and a shell consisting of a plurality of nanoparticles of cerium oxide optionally doped with at least one metal (M′), which can be the same or different from metal (M), formed on the surface of the core particle. The invention also relates to dispersions thereof in a liquid medium, to a process for producing the same and to the use of these particles and dispersions in polishing applications such as chemical mechanical polishing.

The invention discloses a hydroxyapatite-cerium oxide composite material preparation method, which comprises: (1) preparing octahedral cerium oxide: dissolving a certain amount of cerium nitrate in deionized water, and stirring for 1 h in a nitrogen atmosphere; the preparation method comprises the following steps: in a nitrogen atmosphere, dropwise adding a certain amount of alkali liquor into a cerium nitrate solution at a certain speed, carrying out hydrothermal reaction, washing, centrifuging, drying and calcining to obtain octahedral cerium oxide; (2) dispersing calcium salt and octahedral cerium oxide in a certain amount of deionized water, vigorously stirring for a period of time, evaporating water in the system, re-dispersing the solid in the deionized water, fully mixing with the ammonium dihydrogen phosphate solution, controlling the pH value of the mixed solution to be 7-12, stirring for a certain time at a certain temperature, filtering, washing and drying to obtain the octahedral cerium oxide. And washing and centrifugally drying to obtain the hydroxyapatite-cerium oxide composite material. The hydroxyapatite-cerium oxide composite material prepared by the invention is high in activity and good in dispersity, can obviously improve the polishing rate of silicon dioxide, and has a relatively high application prospect.

The application provides a skin care composition containing siloxane treated cerium oxide and a preparation method thereof, and belongs to the technical field of cosmetics. The skin care composition comprises the following components: 5-15% of siloxane treated cerium oxide, 0.5-1.5% of sodium chloride or magnesium sulfate, 10-20% of a humectant, 0.1-1.5% of an antioxidant, 0.5-2% of a thickening agent, 0.001-4% of a skin conditioning agent, 2-6% of an emulsifier, 10-35% of an emollient, 0.05-0.25% of a fragrance, 0-10% of a filler, and water in a residual amount. The application adds the siloxane treated cerium oxide in the skin care composition, compared with traditional physical sunscreen agents, and overcomes the disadvantages of pale color and low ultraviolet absorption efficiency. Secondly, through the design of a multiple emulsification system formula, the purpose of high content of the siloxane treated cerium oxide is achieved, and the characteristics of moisturizing, lightness and non-stickiness are achieved.

The invention relates to a photo-thermal composite phase-change material with a built-in electric field for driving heterogeneous interface electron transfer and a preparation method of the photo-thermal composite phase-change material. The preparation method comprises the following steps: adsorbing multi-element metal through a metal organic framework precursor, and performing high-temperature carbonization to construct a graphitized carbon encapsulated metal nanoparticle coupled metal oxide ternary heterogeneous interface structure carrier; a built-in electric field is induced to be generated at a heterogeneous interface by utilizing Fermi energy level difference between the metal nanoparticles and the metal oxide, and electrons are driven to be transferred between the metal nanoparticles and the metal oxide; rich oxygen vacancies in the metal oxide effectively capture electrons, and efficient and controllable photon-generated carrier separation and utilization are achieved; and a pi-pi conjugate network of graphitized carbon forms a continuous electron transmission channel, so that rapid conduction of heat is further guaranteed. The problems that a traditional composite phase change material is high in carrier recombination rate, single in photothermal conversion mechanism and insufficient in thermal management controllability are solved, and the composite phase change material has application potential in the fields of solar heat storage, industrial waste heat recovery, intelligent temperature control systems and the like.

The present disclosure discloses a method for preparing rare earth oxide by recycling ammonia and carbon, comprising the steps of: (1) heating raw materials containing a first rare earth carbonate and a first rare earth oxide with microwave and calcining at 500-1000° C. for 20-120 min to obtain a second rare earth oxide and carbon dioxide; (2) reacting carbon dioxide with a first ammonia water to obtain a precipitant; (3) reacting the precipitant with rare earth chloride to obtain a second rare earth carbonate and ammonium chloride wastewater. In the method, calcination time is short, rare earth recovery rate, utilization rate of ammonia and carbon resources are high. The present disclosure also provides a use of a rare earth oxide in shortening calcination time and / or increasing rare earth yield.

The application provides a lithium manganese iron phosphate positive electrode material and a surface lithiumation compensation process thereof, and belongs to the technical field of new energy batteries. The compensation process comprises the following steps: providing a lithium manganese iron phosphate base material; constructing an interface stabilization layer on the surface of the base material, wherein the interface stabilization layer is a rare earth oxide layer; and constructing a composite functional layer on the interface stabilization layer, wherein the composite functional layer comprises carbon material and composite fluoride, and the composite functional layer simultaneously provides stress buffering and lithium ion conduction functions. The lithium ion battery prepared from the lithium manganese iron phosphate positive electrode material has a significant improvement in cycle life and rate performance, can meet the demand of new energy vehicles and energy storage for high-performance batteries, and has a wide market application prospect.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the triangular cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 1-3, and carrying out sol-gel reaction to obtain triangular cerium dioxide sol; and (3) carrying out post-treatment on the triangular cerium dioxide sol to obtain the triangular cerium dioxide. According to the preparation method of the triangular cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the triangular cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.