47results about How to "Uniform and controllable shape" patented technology

The invention relates to a method for preparing series of high-purity silver nanometer materials. The method comprises the following steps: using a halogen-containing metal salt adjuvant to treat polyalcohol, a macromolecule surface active agent, the halogen-containing metal salt adjuvant and salts of silver ions in three steps, and then preparing the nanometer materials by performing a hybrid reaction at a high temperature. The nanometer materials prepared by the using the method have the advantages of uniform appearance, high purity, excellent monodispersity, lower cost, and simple reaction device. By using the method, the appearance is controllable, the size controlling scope is wide, and the large-scale synthesis of silver nanometer materials can be realized. The method has an industrialization prospect.

The invention discloses a cobalt @ cobaltosic oxide nanoparticle embedded nitrogen-doped carbon nanotube material and a preparation method and application thereof. The preparation method comprises that a cobalt source, P123, a nitrogen source and a solvent are mixed to prepare a precursor solution, the solvent is removed from the precursor solution to obtain a mixture; and 2) the mixture is groundto obtain powder, the powder is burned in protective gas to prepare the Co@Co3O4 nanoparticle embedded nitrogen-doped carbon nanotube material. The nitrogen source is at least one selected from melamine, urea and 2-methylimidazole. The preparation method is low in cost and simple in technology, the Co@Co3O4nanoparticle embedded nitrogen-doped carbon nanotube material with uniform morphology, different from a routine load form, controllability and higher particle dispersiveness is obtained, and further the material can be used as a cathode catalyst of a fuel cell.

The invention discloses a novel method for performing a copolymerization reaction of dicyclopentadiene and maleic anhydride, and belongs to the technical field of copolymers. The method comprises the following steps of: under the protection of nitrogen, adding monomers and an initiator into an organic medium and dissolving, reacting for 2 to 12h at the temperature of between 60 and 90 DEG C to obtain a self-stabilizing dispersion system of monodisperse microspheres of an alternating copolymer, and performing centrifugal separation, and drying to obtain a white solid of the dicyclopentadiene/maleic anhydride alternating copolymer, wherein the reaction monomers are the dicyclopentadiene and the maleic anhydride, and the molar ratio of the two monomers is 5:1-1:5; the medium is a mixed solvent of organic acid alkyl ester and organic alkane, and the organic acid alkyl ester accounts for 30 to 70 volume percent of the mixed solvent; and a chemical structure is that: R1 is a hydrogen atom, C1-C5 alkyl, phenyl or benzyl, and R2 is C1-C5 alkyl. A stabilizer and a costabilizer are not required to be added, the reaction system is simple, and a product is easy to separate; and polymer microspheres have smooth and clean surfaces, uniform particle sizes, controllable appearances, and high dispersibility.

The invention discloses an N-doped porous carbon-coated MoP nanorod material, and a preparation method and application thereof. The preparation method of the N-doped porous carbon-coated MoP nanorod material comprises the following steps: 1) performing a contact reaction on MoO3 nanorods, a surfactant, a zinc source and dimethylimidazole in a solvent to prepare precursor powder; and 2) calcining and carbonizing the precursor powder under protective gas, and then performing phosphating treatment on the calcined and carbonized product to obtain the N-doped porous carbon-coated MoP nanorod material. The N-doped porous carbon-coated MoP nanorod material has excellent catalytic activity, so the N-doped porous carbon-coated MoP nanorod material can be applied to HER electrocatalysis; and meanwhile, the preparation method has the advantages of simplicity in operation and uniform and controllable morphology.

The invention discloses a preparation method for cuboid-shaped indium oxide single crystal, which belongs to the hydro-thermal method and consists of the steps of preparing a feature control agent, preparing indium saline solution, preparing a precursor, offcenter separation, calcination, natural cooling, etc. By using the feature control agent, the invention solves the problems that the feature of a sample is difficult to control and easy to collapse and the crystal formed is polycrystal when the hydro-thermal method is used in the prior art; preparing the cuboid-shaped indium oxide single crystal with a controllable feature by using the hydro-thermal method is realized; Owing to the invention, the decentrality of the obtained indium oxide single crystal is good; the feature is uniform and controllable; the preparation method of the invention is simple; the raw material is easy to get; the cost is low; the single crystal of the invention can be suitable for a large scale of industrialized production.

The invention provides a method for preparing palladium and copper alloy nanowires through heliothis armigera nuclear polyhedrosis protein. According to the method, mainly, heliothis armigera nuclear polyhedrosis protein freeze-drying powder is taken, and a polyhedrosis protein solution with the concentration being 0.001-0.01 mg/mL is prepared; a Na2PdCl4 and CuCl2 mixed solution with the ratio of Pd atoms to Cu atoms being 1-4:1-4 is added in the polyhedrosis protein solution, nitrogen is introduced for 5-30 min to remove oxygen in the solution, at room temperature, sodium borohydride is added in the above solution for reduction, the molar ratio of a reduction agent to the precursor mixed solution is 1:2-1:4, and the palladium and copper alloy nanowires with the network structure can be obtained. The method is simple in technology and fast in operating process, the raw materials are low in price, easy to obtain and environment-friendly, industrial production is easily achieved, and the prepared network-shaped palladium and copper alloy nanowires are uniform in shape, stable in structure and good in dispersion performance and can bear overspeed centrifugal treatment and ultrasonic treatment.

The invention belongs to the technical field of chemical materials, in particular to a spinel type nanocrystalline material and a preparation method and application thereof. The method comprises preparing spinel type nanocrystals through a chemical liquid phase synthesis and a solvothermal synthesis process, and washing and drying to obtain powder. The prepared spinel-type nanocrystal has a size of 4-10 nm, that general formula is AB2O4, wherein A is one of Mn, Co, Zn and Ni; B is one of Mn and Co. The invention has the advantages of simple process, universality, uniform and controllable nanocrystalline morphology, and great application prospect in the fields of univalent and multivalent ion batteries, supercapacitors, photocatalysis and the like. A water system secondary zinc ion batteryassembled by adopting the spinel type nanocrystalline prepared by the invention as a positive electrode material has high specific capacity and excellent zinc ion storage performance.

The invention discloses a silicon carbide biscuit drying device and an application. The silicon carbide biscuit drying device is used for drying silicon carbide biscuits placed in a drying chamber. The device comprises a heat pump unit, a circulating air duct unit and a draught fan unit, wherein the heat pump unit is arranged above the exterior of the drying chamber, the circulating air duct unitand the draught fan unit are perpendicularly arranged in the drying chamber, the heat pump unit is used for converting damp and hot air flowing through the silicon carbide biscuit in the drying chamber into liquid and then releasing heat to heat the air entering the drying chamber again, the circulating air duct unit is used for shunting the air in the drying chamber, and the fan unit is used fordriving airflow to dry the silicon carbide biscuit. The air flow sequentially passes through the fan unit, the circulating air duct unit and the heat pump unit and then returns to the fan unit to formthe circulating hot air to dry the silicon carbide biscuit. The device is simple in structure, energy is saved, rapid, low-energy-consumption and high-quality drying is achieved, the size is accurate, and the shape and roundness are controllable, the biscuit density is high, and overall uniformity of the product is high.

The invention provides a preparation method of a carbon/Fe3O4 composite material. The preparation method comprises the following steps that an iron source and a liquid-phase carbon source are mixed to obtain a mixture, and then the mixture is heated under sealed conditions to obtain the carbon/Fe3O4 composite material. According to the invention, the iron source and the carbon source are pyrolyzed and carbonized under the sealed conditions to obtain a composite product. Furthermore, the composite material is prepared by using a one-step method, and most of carbon materials in the composite material are carbon spheres which are excellent in conductivity, meanwhile, most of oxide particles are just attached to the carbon spheres, when high-power current multiplying power passes through the material, the carbon spheres can quickly transmit electrons to active oxide particles, therefore, the electron use rate is improved greatly to improve the conductivity and high-rate discharge performances of the composite material. In addition, the carbon materials in the composite product have the effect of stable Fe3O4 particles, so that the discharge specific capacity of the composite material has a rising trend.

The invention provides a gold nanorod and a preparation method thereof. The preparation method comprises the following steps that (1), a growth-promoting media I containing chloroauric acid, reducingagents, soluble silver salts and surface active agents is mixed with a gold seed solution to obtain a mixture, and the mixture is reacted to obtain primary gold nanorod reaction liquid; and (2), a growth-promoting media II containing chloroauric acid, reducing agents and surface active agents is mixed and reacted with the primary gold nanorod reaction liquid obtained in the step (1) to obtain thegold nanorod. The preparation method is designed, regulated and controlled through a multi-step technology, gold seeds are separated from the growing asymmetric formation process and particle growth process from gold particles to the gold nanorod, the synthetic repeatability and reliability of the gold nanorod are obviously improved, the high-concentration and controllable-size gold nanorod is obtained, the use ratio of raw material gold atoms reaches 80% or above, the preparation cost of the gold nanorod is greatly saved, and the controllable scale production of the gold nanorod can be realized.

The invention discloses a sodium vanadium oxychloride phosphate positive electrode material, a preparation method and a sodium ion battery. The molecular formula of the material is Na3(VO)2(PO4)2FxCly, the space group thereof is I4/mmm, and belongs to a tetragonal system. The Na3(VO)2(PO4)2FxCly is in a uniform and regular cube shape, and by adjusting and controlling the anion site of the material, the sodium-ion battery positive electrode material with high storage stability, excellent electrochemical performance and all-weather performance is successfully prepared by adopting a one-step hydrothermal mode, and the sodium-ion battery positive electrode material is prepared by adjusting and controlling an anion mode, namely adjusting and controlling the proportion of F and Cl anions and adjusting and controlling the hydrothermal temperature. The prepared sodium vanadium oxyphosphate positive electrode material has more excellent electrochemical performance, the synthesis process method is simple, precise instruments are not needed, and the method is suitable for large-scale production.

The invention discloses a transition metal sulfide/graphene composite material as well as a preparation method and application thereof. The preparation method of the transition metal sulfide/graphenecomposite material comprises the following steps that: 1, transition metal salt is dissolved in methyl alcohol, and hydroxymethyl hydroxide of transition metal is obtained through a solvothermal reaction; (2) the hydroxymethyl hydroxide of the transition metal is mixed with a graphene oxide dispersion liquid to obtain a hydroxymethyl hydroxide/graphene composite material; and (3) the hydroxymethylhydroxide/graphene composite material isvulcanized to obtain the transition metal sulfide/graphene composite material. The transition metal sulfide/graphene composite material provided by the invention has high specific capacitance and good cycling stability, and also has high energy density.

The invention provides additive machining equipment and a machining method. The additive machining equipment comprises a workbench, a spray head device, a driving device, an electric field generating device and a magnetic field generating device, wherein the workbench is capable of conducting electricity; the spray head device comprises a conductive nozzle and a conductive lower connecting piece, the lower connecting piece is provided with a penetrating first channel, the conductive nozzle is suitable for being in contact with a conductive wire, and inert gas is suitable for being introduced into the first channel; the driving device is connected with the spray head device, and used for driving the spray head device to move; the electric field generating device is electrically connected with the spray head device and the workbench, and used for generating an alternating electric field between the workbench and the conductive wire, and the alternating electric field is used for puncturing the inert gas to generate a plasma arc; and the magnetic field generating device is used for generating an alternating magnetic field in the first channel, and the alternating magnetic field is suitable for synchronous alternating with the alternating electric field.

The invention discloses a preparation method of a nanocomposite, and particularly provides a rapid preparation method of NiMoO4/C nanofibers. The rapid preparation method of the NiMoO4/C nanofibers comprises the following steps: step 1, (NH4)6Mo7O24.4H2O, Ni(Ac)2.4H2O and citric acid are added to a DMF solvent, the mixture is ultrasonically oscillated and stirred, and a disperse solution is obtained; step 2, PVP is added to the disperse solution and stirred to be uniform, and a to-be-reacted solution is obtained; step 3, the obtained to-be-reacted solution is subjected to electrospinning, and polymer metal salt composite fibers are obtained and dried in a vacuum manner; step 4, the product dried in a vacuum manner is calcined in air and decomposed at a high temperature, and the NiMoO4/C nanofibers are obtained. A NiMoO4/C nanocomposite with good continuity can be prepared with the method for preparing the NiMoO4/C nanofibers through electrospinning. The product has excellent electrochemical performance, and electrical conductivity and cycle performance of the product are improved by introducing C, so that the product has better application prospect in the field of energy storage.

The invention provides a preparation method of an SERS (Surface Enhanced Raman Scattering) substrate of a semiconductor oxide nanoparticle modified noble metal nanocone array structure, which comprises the following steps: firstly, carrying out maskless etching on a silicon wafer by adopting a low-temperature inductively coupled plasma enhanced reactive ion etching technology to obtain a high-density large-area nano silicon cone array structure; then coating the nano silicon cone structure with a layer of noble metal film with nano thickness by magnetron sputtering or thermal evaporation; and finally, uniformly loading a layer of ZnO nanoparticles on the nano silicon cone covered by the noble metal film in a monodisperse manner by adopting a pulling impregnation method to obtain the SERS substrate. The ZnO nanoparticle modified noble metal nanocone array structure SERS substrate prepared by the preparation method disclosed by the invention has a physical electromagnetic enhancement effect of noble metal, and is coupled with a charge transfer chemical enhancement mechanism of a semiconductor; the method is of great significance in improving the sensitivity of the SERS substrate, enhancing factors and quantitative analysis capacity of trace substances in actual detection.