201results about How to "The preparation method is simple" patented technology

A process for preparing the array of monosilicon nano wires arranged monoaxially includes such steps as washing silicon chip, chemical plating to deposit a nanofilm of Ag or Au on its surface, immersing it in the mixed solution of hydrofluoric acid, iron (or magnesium or nickel) nitrate or H2O2 in a sealed container, baking at ordinary temp-60 deg.C, cooling, rinsing in deionized water, and drying in air.

The present invention is preparation process of nanometer silicon line array, and belongs to the field of nanometer material preparing technology. The preparation process includes the following steps: washing silicon chip successively with acetone, alcohol, acid cleaning solution and No. 1 standard washing solution; dropping 0.01-0.9 wt% concentration polyethylene pellet solution to the surface of silicon chip and drying in the air; etching the silicon chip with reaction ion in oxygen atmosphere for 1-2 min, maintaining at 90-110 deg.c for 1-6 min, depositing 25-50 nm thick Ag film with vacuum deposition instrument; and soaking the deposited sample inside the etching solution of hydrofluoric acid and hydrogen peroxide for 4-30 min. The preparation process can prepare great area ordered arranged nanometer silicon line array, and is simple, low in cost and suitable for large scale production.

The invention discloses a hydrophobic gas-phase SiO2 nano-pore heat-insulating material and a preparation method thereof. The material is prepared from the following raw materials in percent by weight: 60-80% of hydrophobic gas-phase SiO2, 3-10% of pretreated glass fiber, 8-20% of an infrared shielding agent and 3-10% of an inorganic adhesive. The heat-insulating material has excellent hydrophobic performance, heat-insulting performance and mechanical properties.

The invention belongs to the field of inorganic nano material synthesis and particularly relates to a preparation method and use of millimetre-sized mesoporous carbon spheres. The preparation method comprises the following steps of: dissolving resorcinol in ethanol serving as a solvent; adding furfural and ethanol solution of hydrogen chloride, and stirring the mixture at 0 to 15 DEG C for 10 to 120 minutes; adding aqueous solution of hexamethylenetetramine and pore-forming material into the prepared solution to obtain solution of a precursor; adding the prepared solution of the precursor into liquid max containing an emulsifier, and stirring the solution to perform per-polymerization; volatilizing the solvent, filtering the remaining material, and washing and drying the product obtained by filtration; and carbonizing the product to obtain the millimetre-sized mesoporous carbon spheres. The preparation of the millimetre-sized mesoporous carbon spheres of the invention is performed under simple conditions and with easy operation. The millimetre-sized mesoporous carbon spheres prepared by the method have the characteristics of adjustable size, large specific surface area, large pore volume and the like, and can be used as adsorbent for hemoperfusion and the like.

The invention provides a porous ceramic preparation method, which comprises: mixing first ceramic powder and a first sintering agent, and performing drying to obtain second ceramic powder, the first sintering agent comprising a sodium silicate aqueous solution; mixing the second ceramic powder, an organic auxiliary agent and a pore forming agent to obtain ceramic slurry, performing injection molding on the ceramic slurry to obtain a ceramic green body, the injection pressure of the injection molding being 1MPa to 10MPa, and the temperature being 50 DEG C to 150 DEG C; and degreasing and sintering the ceramic green body to obtain the porous ceramic. According to the preparation method, the yield of porous ceramic production is effectively improved, the steps are simple, the process is simple, multiple ceramic green bodies can be produced at a time, the automation efficiency is high, and the porous ceramic is suitable for large-scale industrial production. The invention further providesporous ceramic and application thereof in an electronic cigarette atomizer. The porous ceramic has good compression resistance and porosity.

The invention provides a preparation method for high-specific-surface porous carbon modified by coal-tar pitch. The preparation method comprises the following steps: dissolving cobalt nitrate in deionized water, carrying out stirring, and adding ammonia water; adding pitch-based active carbon obtained after one-step activation of coal-tar pitch and carrying out uniform mixing under stirring; subjecting a mixture obtained in the previous step to a hydro-thermal reaction and carrying out centrifugation; washing a solid obtained in the previous step and successively carrying out centrifugation, drying and grinding; and subjecting solid powder obtained after grinding to calcining in a tubular furnace in an inert gas environment so as to obtain the high-specific-surface porous carbon modified by the coal-tar pitch. The invention also provides a method for preparing a membrane electrode assembly for a fuel cell from the high-specific-surface porous carbon modified by the coal-tar pitch. Theporous carbon prepared in the invention has a high specific surface area and a porous structure, which is beneficial for transmission of substances like oxygen, so dependence on the precious metal Ptis greatly reduced; the raw material for preparation of the porous carbon is cheap coal-tar pitch; and the preparation method is simple in process, convenient to operate, low in cost, friendly to environment and suitable for industrial production.

The invention discloses a preparation method of a molybdenum disulfide composite material. The preparation method includes the steps: (1) dispersing graphene oxide into water, adding sodium molybdateand thioacetamide, performing hydrothermal reaction to obtain an MoS2/reduced graphene oxide composite material; or dissolving the sodium molybdate and the thioacetamide in the water and performing hydrothermal reaction to obtain petaloid MoS2; (2) soaking the composite material or petaloid MoS2 obtained in the step (1) in porphyrin solution to obtain the molybdenum disulfide composite material. According to the composite material prepared by the preparation method, the photoelectrochemical properties of molybdenum disulfide can be remarkably improved, and the application of the molybdenum disulfide to the field of photocatalytic degradation of organic matters is promoted.

The invention relates to the field of a photoelectric energy source, and discloses a perovskite photonic crystal, a preparation method thereof, a perovskite solar cell and a preparation method of the perovskite solar cell. The perovskite photonic crystal comprises a material providing a photonic crystal structure and a substance, wherein the substance is arranged in the material providing the photonic crystal structure and has a perovskite structure, and the material providing the photonic crystal structure is at least one of an electron transmission layer material, a hole transmission layer material and a support material. The perovskite solar cell comprises a transparent conductive substrate, a titanium dioxide compact layer, a perovskite photonic crystal layer, a hole transmission layer and a counter electrode. The perovskite photonic crystal obtained by the invention has the characteristics of highly ordered structure, high carrier transmission efficiency and low electron-hole combination; the perovskite solar cell obtained by the invention has the characteristics of high photoelectric conversion efficiency and high repeatability and stability; and moreover, the production process is simple, is low in cost and is suitable for mass production at a large scale.

The invention relates to a preparation method of a graphene quantum dot. The preparation method comprises the following steps: I, adding polytetrafluoroethylene and silicon powder in a certain weight ratio into cyclohexane at room temperature, uniformly mixing, drying and placing in a sealed exploder; II, initiating a deflagration reaction, collecting a reaction product after reaction, removing unreacted polytetrafluoroethylene and silicon powder, cooling, cleaning the product and drying to obtain graphene quantum dot polymerized nano particles; and III, stripping the obtained graphene quantum dot polymerized nano particles to obtain the graphene quantum dot. The preparation method of the graphene quantum dot provided by the invention is simple and convenient, simple in equipment used and short in time consumed, can be prepared on a large scale within a short time and is convenient for industrialized production.