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127results about How to "Uniform shape" patented technology

Controllable synthesis method for nitrogen and phosphorus co-doped graphitized carbon ball with hollow structure

The invention relates to a controllable synthesis method for a nitrogen and phosphorus co-doped graphitized carbon ball with a hollow structure. The method comprises the following preparation steps: (1) a carbon source, soluble metal salt and a catalyst are dissolved in a solvent according to a molar ratio, the mixture is transferred to a hydrothermal reaction kettle for hydrothermal synthesis after stirred to be dissolved completely, and an obtained precipitate is cleaned, filtered and dried to obtain a primary product; (2) the obtained primary product is subjected to high-temperature reduction under the protection of gas in a high-temperature reaction furnace; and (3) the product obtained by high-temperature reduction is placed in an acid solution to be soaked, and then cleaned, filtered and dried to obtain the nitrogen and phosphorus co-doped graphitized carbon ball with the hollow structure. The nitrogen and phosphorus co-doped graphitized carbon ball with the hollow structure prepared with the method has the advantages that the appearance is uniform, a carbon shell has a cellular structure, the interior of the carbon ball has a mesoporous carbon support structure, the graphitization degree is good, and the like; and the carbon ball can be used in various fields of efficient catalytic conversion, energy storage and conversion, medicine release and control, substance adsorption and separation and the like. A template-free hydrothermal synthesis technique is simple and controllable, and can be used for mass production.
Owner:CHINA UNIV OF MINING & TECH +1

Micron/nanoscale BiOCl film material and preparation method thereof

The invention relates to a micron/nanoscale BiOCl film material and a preparation method thereof. The film material comprises a substrate. A layer of bismuth metal film is deposited on the substrate; a layer of BiOCl film consisting of two-dimensional BiOCl nano sheets is formed by using the bismuth metal film as a raw material. The thickness of the BiOCl film is between 30nm and 2 mu m. The preparation method for the micron/nanoscale BiOCl film material comprises the following steps: depositing a layer of bismuth metal film on the substrate by adopting physical vapor deposition; soaking in solution containing H2O2 and Cl- by a wet method, adjusting the volume percentage of H2O2 to 1 to 99 percent and the concentration of Cl- to between 0.01 and 2 mol/L to ensure that the pH value of the mixed solution is in a range from 0.5 to 7, keeping the temperature of a reaction system between 20 and 80 DEG C, and soaking for 1 to 60 minutes; and obtaining the micron/nanoscale BiOCl film material with different features after washing. The preparation method for the micron/nanoscale BiOCl film material has the advantages of simple and controllable process, uniform dimension and feature of the product, short production cycle, low cost and suitability for large-scale industrial production. The BiOCl film material has wide application prospects in photocatalysis, optoelectronic thin-film devices, nanocoatings, pearl pigments, and other fields.
Owner:THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA

Microfluidic-control preparation method for microsphere of polymethylmethacrylate-coated cadmium telluride (CdTe) quantum dot

InactiveCN102504822AUniform shapeConsistent and uniform sizeLuminescent compositionsInjectorQuantum dot
The invention relates to a microfluidic-control preparation method for a microsphere of a polymethylmethacrylate-coated cadmium telluride (CdTe) quantum dot, and relates to a preparation method for the microsphere of a polymethylmethacrylate-coated CdTe quantum dot. The microfluidic-control preparation method for the microsphere of the polymethylmethacrylate-coated (CdTe) quantum dot aims to solve the problems that the surface of the quantum dot needs to be modified and the quantum dot is easy to dissolve by the microsphere of the polymethylmethacrylate-coated CdTe quantum dot by adopting a traditional preparation method for the microsphere of the polymethylmethacrylate-coated CdTe quantum dot. The method comprises the following steps: preparing a sodium hydrogen telluride solution; preparing a CdTe quantum dot; preparing a polymer solution; connecting a microfluidic-control system; respectively putting the polymer solution and silicone oil into injectors A and B of the microfluidic-control system; setting the propulsion speed of the injectors A and B; after starting, formed liquid beads flow into a rotary evaporator; and curing and evaporating the silicone oil to obtain the microsphere of the polymethylmethacrylate-coated CdTe quantum dot. In the microfluidic-control preparation method for the polymethylmethacrylate-coated CdTe quantum dot, the polymethylmethacrylate-coated CdTe quantum dot is selected, therefore, fluorescence is stable, and the microsphere can be adjusted in size and can be used for field of fluorescent display and the like.
Owner:HEILONGJIANG UNIV

Preparation method of nanometer cordierite-based ceramic dielectric material used for high-frequency chip inductor

The invention relates to a preparation method of a nanometer cordierite-based ceramic dielectric material used for a high-frequency chip inductor, which comprises the following steps of: (1) preparing magnesia-alumina-silica sol; (2) preparing opposite-phase W/O (water-in-oil) microemulsion; (3) performing gelation technology; and (4) pressing amorphous cordierite powder obtained in the above steps by adopting a semi-dry method under the pressure of 100-120 MPa to form small wafers, sintering the small wafers at 850-1050 DEG C in a silicon-molybdenum rod resistor furnace, and maintaining the temperature for 3-6 hours to obtain the nanometer cordierite-based ceramic dielectric material used for the high-frequency chip inductor. The invention has the advantages of regular and uniform nanometer powder shape, high powder surface activity and low degree of aggregation, and is applicable to tape casting. The material can be cofired together with an Ag/Pd electrode at the temperature lower than 950 DEG C to be prepared into ceramics, and the dielectric requirements (epsilon<5, and tg delta<0.001; 1 GHz) and the thermal expansion requirements (3*10<-6>K<-1><=alpha<=6*10<-6>K<-1>, 25-300 DEG C) of the dielectric material used for the high-frequency chip inductor can be met.
Owner:SHENYANG UNIV

Method for preparing caesium-lead halide nanorod and product obtained through method

ActiveCN105384189AEasy to operateUniform shapeLead halidesNanotechnologyOctadeceneSolar battery
The invention discloses a method for preparing a caesium-lead halide nanorod and the product obtained through the method. The method includes the steps that lead halide and octadecene are mixed to be stirred for 0.5-1.5 hours, and then oleylamine and oleic acid are added into a mixture in sequence to be stirred till the lead halide is completely dissolved; the lead halide is heated to 130-200 DEG C after being completely dissolved, then a caesium precursor solution is slowly poured into liquor, and caesium-lead halide is prepared through a thermal insulation reaction; after the reaction is completed, reaction liquid is subjected to centrifuging, separating and washing, and accordingly the caesium-lead halide nanorod is obtained. According to the method, the caesium-lead halide nanorod is synthesized in an organic phase system, the reaction temperature is 130-200 DEG C, and the method belongs to a low-temperature organic phase synthesis method; the method is easy to operate, high-temperature and high-pressure reactions can be avoided, safety is achieved, the size of the nanorod can be regulated and controlled through the reaction condition, the obtained caesium-lead halide nanorod is even in shape, good in crystal form, and wide in application prospect in the fields of solar cells, LEDs, panel display and the like.
Owner:UNIV OF JINAN

Preparation method of octahedral porous molybdenum dioxide and application of octahedral porous molybdenum dioxide in lithium-ion battery

The invention discloses a preparation method of octahedral porous molybdenum dioxide and an application of the octahedral porous molybdenum dioxide in a lithium-ion battery. The preparation method comprises the steps of: adding trimesic acid and tetramethyl ammonium hydroxide to a solution containing a copper salt and a phosphomolybdic acid and/or phosphomolybdate for stirring to form an emulsion; transferring the emulsion into a hydrothermal reaction kettle for hydrothermal reaction to obtain a precursor compound; and putting the precursor compound into a protective atmosphere, carrying out thermal treatment at a high temperature and then washing the product to obtain a porous octahedral molybdenum dioxide material which is formed by stacking and assembling ultrafine nanoparticles, is uniform in shape and form and good in stability and has a porous characteristic. The molybdenum dioxide material is applied to the lithium-ion battery as a negative electrode material, so that the rate capability and the cycling stability of the electrode material are improved under the premise of ensuring the specific capacity; the preparation technology of the molybdenum dioxide material is simple; the cost is low; and the molybdenum dioxide material has a relatively good research prospect.
Owner:CENT SOUTH UNIV
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