48 results about "Materials science and technology" patented technology

The invention relates to spirofluorene xanthene phosphine oxide electro-phosphorescent main materials and synthesis and application methods thereof, belongs to the field of photoelectric material science and technology, and in particular relates to four spirofluorene xanthene organic phosphine oxide materials and application of the materials in the field of organic electronics such as organic electroluminescent materials, organic solar cells, organic field-effect tubes, dye laser, organic nonlinear optical materials, fluorescent probes and the like. The series of materials are obtained by introducing diphenyl phosphine oxide groups to the 2nd site, the 2nd and 7th sites, the 2nd' site and the 2nd' and 7th' sites of spirofluorene xanthene respectively. The series of compounds have good charge transfer performance, thermal stability and high triplet energy level (ET=-2.86eV), and can be used as main materials and applied in phosphorescent devices. When the series of compounds are applied in the organic electro-phosphorescent devices, the maximum external quantum efficiency is 10.78 percent and the maximum brightness is 8,582cd/m<2> in the blue phosphorescent device; and in the green phosphorescent device, the maximum external quantum efficiency is 19.1 percent, and the maximum brightness is 16,943cd/m<2>.

Conjugation interrupted polymer semiconductor materials and their preparation and application methods belong to the field of organic photoelectric materials technology, and have potential important applications in the fields of light-emitting diodes, solar cells, phosphorescent host materials, organic electrical storage materials, porous materials, and gas sensing. . The conjugation interrupted polymer semiconductor material of the present invention has the following structure: the material has the advantages of high stability and simple synthesis route. This type of conjugation interrupted hyperbranched polymer semiconductor photoelectric material is prepared by Friedel-Crafts polymerization catalyzed by boron trifluoride ether at room temperature; the raw material is cheap, the operation is simple, the preparation is at normal temperature, and the yield is high.

The invention relates to a porous Ni-S/TiO2 composite hydrogen evolution electrode and a preparation method thereof, and belongs to the field of the material science and technology and the field of electro-catalysis hydrogen production. According to the electrode, three-dimensional foamed nickel is adopted as a carrier to provide a porous structure, a nickel-sulfur plating layer is adopted as a surface active layer, TiO2 is doped in the nickel-sulfur plating layer in a composite manner through a composite electrodeposition method, and the foamed nickel based Ni-S/TiO2 composite hydrogen evolution electrode with the porous structure is formed. The composite electrodeposition method is adopted, and nickel-sulfur plating layer deposition is carried out on the surface of the three-dimensionalfoamed nickel. Meanwhile, in the electrodeposition process, the nanoscale TiO2 in composite plating liquid is doped in the nickel-sulfur plating layer through magnetic stirring. The prepared hydrogenevolution electrode has the advantages of being low in overpotential, high in electrode stability and the like, the preparation process is simple, cost is low, and the electrode is suitable for large-scale production.

The invention discloses a phosphorus-containing compound, and a preparation method and an application thereof, and belongs to the fields of material science and technology and chemistry. The phosphorus-containing compound is prepared from cheap raw materials through the simple method; the method is essentially characterized in that the compound is prepared from metal ions and a phosphorus source under the illumination condition of a photoactive material; and the temperature in the prior art is more than 100 DEG C, and the method in the invention is a normal temperature synthesis process, so the obtained compound has a weak crystallization degree. The phosphorus-containing compound has a high photocatalytic activity as a conventional catalyst and a photocatalytic reaction cocatalyst, and achieves a high hydrogen production rate for a photocatalytic hydrogen production reaction. The method and the phosphorus-containing compound can be used for producing an electrode and producing a battery, so the production cost of the electrode and the battery is reduced, the preparation method is simplified, and the obtained electrode is a non-noble metal catalyst, and has the advantages of low cost, low overpotential, high stability and certain industrial application values.

The invention belongs to the field of material science and technology and specifically relates to a method for preparing a light rare earth hydride by a high-temperature direct method. The method comprises the following main implementation steps: placing light rare earth with purity being greater than 99% and particle size being 2-15mm into a quartz glass test tube under the inert gas protection, removing air in a boiler room by the use of inert gas, closing an air evaporation valve, rapidly heating the boiler room at the heating rate of 2-20 DEG C/min until heating to 300-1000 DEG C, controlling inflow of hydrogen to 200-10,000 ml/min, and keeping the temperature and continuously reacting until a hydrogen pressure gauge and pressure in a heating reaction furnace are completely balanced, so as to obtain the required light rare earth hydride and corresponding light rare earth hydride powder. Purity of the light rare earth hydride prepared by the above method is 97-99.99%, and conversion rate of the light rare earth hydride powder is 97-99.99%. Thus, the hydride preparation purity problem in an industrial preparation technology is solved. The method is safe, reliable and is pollution-free, and is of great significance for industrialized and large-scale production of the light rare earth hydride.

The invention discloses application of a lithium-type molecular sieve in water removal, sodium removal and hydrogen fluoride removal treatment on a non aqueous electrolyte. The lithium-type molecular sieve is a full-lithium-type zeolite molecular sieve (the silica-aluminum ratio is 1:(0.9-1.1), and the lithium content exceeds 99.5%), and the full-lithium-type zeolite molecular sieve is produced by China Shipbuilding Industry Corporation 712 Research Institute and Suzhou Li'ang New Material Limited Company which are entrusted by Suzhou Simeite Surface Material Science and Technology Ltd. and has the type of LXO199/LXO280. The lithium-type molecular sieve can directly conduct water removal, sodium removal and hydrogen fluoride removal on the non aqueous electrolyte by serving as a packaging reagent, be mixed with an electrode material to be prepared into an electrode to control the water content of an assembled lithium ion battery and effectively remove hydrogen fluoride generated by the lithium battery in the charging and discharging process.

The invention relates to a method for preparing the magnesia crystal by the temperature-controlling arc furnace, which belongs to the material scientific and technical field. The method uses the arc furnace published by (an arc furnace for preparing magnesia crystal), uses the data from the temperature-sensitive device and the furnace temperature state which is computed by the presetted thermal field equation as the criterion to arc welding and cooling, and forms the thermal field avails to crystal growth through the copulation of the arc and cooling device. The invention can increase the yield and quality of the magnesia crystal and can be used for growing another high temperature crystal.

The invention discloses chitosan multilayered gel balls and a preparation method thereof, and belongs to the field of material science and technology. The preparation method comprises the following steps: dripping a chitosan acid solution into a sodium alginate solution while completely soaking chitosan drop into the sodium alginate solution; soaking a mixture into a NaOH solution after standing and washing, so as to obtain chitosan gel balls; repeatedly soaking the chitosan gel balls into deionized water and a NaOH solution, so as to obtain the chitosan multilayered gel balls. The chitosan multilayer gel balls with different layer quantities and different layer thicknesses can be obtained by controlling the concentration of the NaOH solution and soaking time. The preparation method disclosed by the invention has the advantages of no pollution, simple reaction instrument, temperate reaction conditions and the like, and is a method for inducing the inside of a soft material to generate an accurate and complex structure through external stimulation. The chitosan multilayered gel balls prepared by the invention have the advantages of complex internal structure and large surface area, and can be applied to various fields as a reaction template of nanometer particles.

The invention belongs to the field of material science and technology processing and manufacturing, and relates to a titanium alloy forge piece preparation method. According to the method, firstly, aqualified cast ingot is subjected to one-to-two-heat two-upsetting two-drawing deformation at 1000 DEG C to 1150 DEG C to obtain a primary square billet; then the primary square billet is subjected totwo-heat short-process rolling at 30 DEG C to 60 DEG C below a phase transformation point to obtain a finished plate with a thickness of 110 mm; then by using a water jet cutter or through wire cut electrical discharge machining, blanking is carried out to directly obtain a balance elbow intermediate billet, then the balance elbow intermediate billet is bent and die-forged at 35 DEG C to 40 DEG Cbelow the phase transformation point to obtain a balance elbow die forging; and finally, heat treatment is carried out on the balance elbow die forging to obtain a balance elbow forge piece finishedproduct. According to the preparation method, a whole-process low-cost control thought is adopted, and large-deformation short-process rolling processes of two-phase regions at different temperaturesare introduced, so that purposes of quickly refining and homogenizing a structure are achieved, the manufacturing cost of a forge piece is reduced, and the fatigue performance of the forge piece is improved.

The invention discloses a preparation method and propane oxydehydrogenation application of rodlike hexagonal boron nitride foam, and relates to the fields of material science and technology and petrochemical engineering. The preparation method of the rodlike hexagonal boron nitride foam utilizes a hydrolysis polymerization reaction of melamine and boric acid. A dried precursor is reduced in ammonia gas to generate hexagonal boron nitride which is a white foam solid. The foam is prepared from rodlike hexagonal boron nitride having connected pores (with the size of about 100 nm). The pore structure is beneficial to gas circulation and diffusion, so the foam has good potential as a heterogeneous catalyst. The rodlike hexagonal boron nitride foam shows excellent propane dehydrogenation performance. The method has the advantages of simplicity, high yield, facilitation of large-scale industrial production, and remarkable economic and social benefits.

The invention discloses a preparation method of a polylactic acid fiber pre-spinning colorant, and belongs to the technical field of fine chemical engineering and material science and technology. According to the preparation method provided by the invention, nano modified pigment is prepared by an in-situ polymerization method, and the nano modified pigment is used for pre-spinning coloring of polylactic acid fibers. The modified pigment prepared by the method has a small particle size, narrow distribution and a relatively high surface energy, wherein the particle size is about 200nm, the PDIis about 0.2, and the surface energy is about 38.5; and the modified pigment is similar to polylactic acid, and thus has good compatibility with a polylactic acid fiber spinning solution.

The invention discloses a high-purity large-size silicon carbide single crystal and a preparation process thereof, and belongs to the field of the material science and technology. The preparation process comprises the steps of taking high-purity SiC powder as the raw material, realizing rational grain composition of the SiC powder different in grain size and obtaining the maximum loading density, next, loading the SiC powder in an ultrahigh-power vertical electric arc furnace, carrying out static smelting at a high temperature and under high pressure, and then growing the high-purity large-size silicon carbide single crystal through recrystallization. The manufacturing method of the high-purity large-size silicon carbide single crystal has the advantages of simple process and low cost, and the prepared silicon carbide single crystal is high in purity (> 99.99%), large in size (greater than or equal to 25mm), colourless to light green and transparent, and has a 3C crystal structure. The preparation process is simple, low in cost, high in efficiency, and advantageous for popularization and application.

The invention belongs to the field of material science and technology, and discloses fluorescent powder for non-contact fluorescence temperature measurement and a preparation method thereof. The component of the fluorescent powder for non-contact temperature measurement is (RE<1-x-y>Yb<x>Er<y>)<2>W<2>O<9>, and the fluorescent powder for non-contact temperature measurement has high absolute sensitivity (Sa=0.0253 K<-1>) and relative sensitivity (Sr=0.0105 K<-1>) by using the fluorescence intensity ratio of thermal coupling energy levels 2H11/2 to 4I15/2 and 4S3/2 to 4I15/2 of rare earth ions Er<3+> for temperature measurement. The preparation method is low in temperature, energy-saving, simple in synthesis process and easy to operate. The reaction is carried out at room temperature to 70 DEG C to obtain a precursor product, and the (RE<1-x-y>Yb<x>Er<y>)<2>W<2>O<9> fluorescent powder can be obtained through simple calcination. No organic matter or surfactant is added in the synthesis process, and nano powder with uniform size and good dispersity can be obtained through simple precipitation and subsequent calcination.

The invention provides a technological composite decorative material, comprising a core board, the raw materials of the core board and the parts by weight of each raw material are 22-34 parts of balsa wood powder; 16-29 parts of bamboo charcoal powder; 11-19 parts of cut glass fiber; 4-9 parts of polyolefin elastomer; 9-16 parts of composite vegetable dye; 16-23 parts of soybean protein fiber; 17-21 parts of cyanuric chloride; polyhexamethylene guanidine propionate 7‑15 parts; 11‑26 parts of chitosan quaternary ammonium salt; 13‑25 parts of triethanolamine; 3‑9 parts of gallic acid. The invention has the characteristics of high hardness and light specific gravity, and its properties of compression resistance, bending resistance and impact resistance are superior to those of natural wood. Environmental protection, flame retardant, moisture-proof, moth-proof, no deformation, high hardness, not afraid of water immersion, easy maintenance, high wear resistance, longer service life, etc. Simultaneously, the present invention also adds compound vegetable dyes, endows multiple colors, and simultaneously the color and luster is brighter, and the three-dimensional sense of texture is stronger.

The invention relates to a surface plasma resonance induced multilevel structure and a modification method thereof, and belongs to the field of material science and technology. The surface plasma resonance induced multilevel structure and the modification method thereof uses a colloidal microsphere gas-liquid interface self-assembly method, a mask etching method and a physical vapor deposition method successively to prepare a metal hollow cone film structure, then uses a micro-nano structure liquid phase transfer and inversion method to invert the metal hollow cone array film on a target substrate, and then a metal inverted hollow nano cone array film structure is obtained. According to the surface plasma resonance induced multilevel structure and the modification method thereof, the sizeand distribution of a silver nanoparticle can be well controlled by adjusting the irradiation time of commercial LED light source; in addition, the method can also be used for modifying gold nanoparticles and polypyrrole particles; and in the surface plasma resonance induced multilevel structure and the modification method thereof, the metal inverted hollow nano cone array film is only used as a specific structure for experimental implementation, and in fact, the method is suitable for surface modification of various micro nano structures with surface plasmon resonance and can be used for large-area modification of multilevel structures.

The invention discloses a low-pressure chamber high-frequency micro-vibration wetting coating method and equipment, and belongs to the technical field of material science and technology and thin filmpreparation. The method comprises the following steps: (1) placing a solar cell substrate in a closed chamber with the pressure of 1,000 Pa-5,0000 Pa; 2) coating the surface of a solar cell substratewith the coating substance, and performing normal vibration on the solar cell substrate by using a vibration source with the frequency of 20-200KHz and the amplitude of 10nm-100nm to form a liquid film on the surface of the solar cell substrate; and 3) drying and annealing the liquid film on the surface of the solar cell substrate to form a wet coating film on the surface of the solar cell substrate. According to the method, under the action of high-frequency micro-vibration, the perovskite solution or sol has a dynamic wetting effect on an undulating interface of the pit of the solar cell substrate, bubbles at the pit are effectively discharged and infiltrated into the pit, uncovered holes between the perovskite film and the solar cell substrate are greatly reduced, and the coating speedand the coating quality of the perovskite solution can be greatly improved.

The invention provides a technological decorative material, comprising a core board, the raw materials of the core board and the parts by weight of each raw material are 22-34 parts of balsa wood powder; 16-29 parts of bamboo charcoal powder; 11-19 parts of glass fiber; 4-9 parts of polyolefin elastomer; 9-16 parts of composite vegetable dye; 16-23 parts of basalt fiber; 17-21 parts of cyanuric chloride; 7-15 parts of cinchonidine sulfate; 11-26 parts of chitosan quaternary ammonium salt; 13-25 parts of octadecyl dimethylamine; 3-9 parts of ethylene carbonate. The invention has the characteristics of high hardness and light specific gravity, and its properties of compression resistance, bending resistance and impact resistance are superior to those of natural wood. Environmental protection, flame retardant, moisture-proof, moth-proof, no deformation, high hardness, not afraid of water immersion, easy maintenance, high wear resistance, longer service life, etc. Simultaneously, the present invention also adds compound vegetable dyes, endows multiple colors, and simultaneously the color and luster is brighter, and the three-dimensional sense of texture is stronger.

The invention discloses a method and equipment for enhancing wettability of a thin film by utilizing high-frequency micro-vibration, and belongs to the technical field of material science and technology and thin film preparation. The method comprises the following steps: firstly, coating the surface of a solar cell substrate or a thin film with a coating substance system, enabling the solar cell substrate to vibrate by adopting a plurality of vibration sources to form a layer of liquid film on the surface of the solar cell substrate or the thin film, and secondly, drying and annealing the liquid film on the surface of the solar cell substrate or the thin film, and forming a wetting film on the surface of the solar cell substrate or film. Under the action of multi-source multi-direction high-frequency micro-vibration, a high-frequency dynamic wetting effect is continuously generated at the interactive front edge of the liquid film and the solar cell substrate or the thin film pit, so that bubbles in the pit are expelled, infiltration and filling of large-roughness, large-fluctuation and deep pits are realized, uncovered areas of the thin film and the solar cell substrate or the thinfilm are greatly reduced, the coating speed and the coating quality of the thin film are effectively improved, and a technical scheme is provided for cheap and rapid preparation of large-area perovskite solar cells.

The invention provides a surface passivation method of a semiconductor material, and relates to the technical field of material science and technology. The surface passivation method of the semiconductor material comprises the following steps: S1. preparing a HCl solution and soaking the semiconductor material in the HCl solution for 15-30min, then taking out the semiconductor material and cleaning its surface with distilled water and sending the semiconductor material into a vacuum environment for drying treatment after cleaning; and S2. placing the semiconductor material in a high-temperature furnace and adjusting the temperature in the high-temperature furnace to the range of 1000-1200 DEG C to form a thermal oxide film on the surface of the semiconductor material and then cooling the semiconductor material by nitrogen. The formed thermal oxide film is removed and then a silicon dioxide passivation layer is formed at a low temperature so that the silicon dioxide passivation layer can be better attached to the surface of the semiconductor material. Meanwhile, the influence of Na ions on the semiconductor material is further removed through the treatment of the HCl solution and the HF solution so that the passivation effect of the semiconductor material is greatly improved.