35results about How to "Shape and size are easy to control" patented technology

The invention discloses a preparation method of gradient porous alumina ceramics and relates to a preparation method of the porous alumina ceramics. The invention solves the problems of poor pore distribution, difficult control over pore shape, and low porosity of gradient porous ceramics obtained by using the prior preparation method. The preparation method of the invention comprises the following steps: firstly, mixing alumina powder, camphene and fatty acid polycondensate to obtain paste; secondly, carrying out the injection molding on the paste to obtain a blank; and thirdly, drying the blank, and then heat-treating to obtain the gradient porous alumina ceramics. In the invention, the oriented pore distribution of the gradient porous alumina ceramics is obtained by utilizing the property that the crystallization rates of the camphene are different at different temperatures; the gradient porous alumina ceramics have the advantages of controllable shape, networking communication of pores, and high porosity; the porosity of the gradient porous alumina ceramics is 71-85%, the density is 0.63-0.88 g / cm3, the compression strength is 8-35 Mpa; and the gradient porous alumina ceramics can be used in the industries of high-temperature insulation, fuel cells, filters, sound absorption and the like.

The invention relates to a water-emulsified polydimethylsiloxane functional sponge, a preparation method and application thereof. The preparation method includes: mixing a prepolymer A of polydimethylsiloxane with a curing agent B evenly, then adding an organic solvent, then adding water dropwise, at the same time performing stirring, then conducting standing for preliminary curing; and carrying out heating curing, and removing the organic solvent and water, thus obtaining the water-emulsified polydimethylsiloxane functional sponge. The functional sponge prepared by the method provided by theinvention has the advantages of large oil absorption ratio, fast oil absorption rate, recyclable use, high porosity, adjustable thickness and the like, can be applied to separation of oil and non-polar organic solvent in water, and has great application value in oil leakage emergency treatment, oil-water mixture separation treatment and other fields.

The invention relates to platinum-copper nanocrystals as a tumor photothermal ablation diagnosis and treatment agent and a preparation method thereof, and belongs to the technical field of nano biomaterials. The platinum-copper bimetallic nanocrystals have the particle size in a range of 5-200 nm and have the basic structure of PtCun, wherein n is in the range of 0-5; the morphology has one or more of cube, sphere, snowflake shape, and lamellar shape. The platinum-copper nanocrystals can be applied to near infrared light mediated tumor photothermal ablation, and are applicable to the near infrared light wavelength range of 700-1100 nm. The platinum-copper nanocrystals are prepared by a pyrolysis method, and in a high-boiling-point oil phase medium, the snowflake-shaped platinum-copper bimetallic nanocrystals are prepared by metal precursor thermal reduction decomposition. The nanocrystals have the advantages of low cost, simple preparation, high purity, good crystal shape, controllable particle size and regular shape, are used as a near infrared photothermal conversion agent to be applied to tumor photothermal ablation, have obvious effect, and provide a research direction for tumor therapy.

The invention discloses a pressing bottle with a bag, which comprises an inner bag, a bottle body and a pump head connected with the bottle body; the inner bag is located in the bottle body, and the opening of the inner bag is connected with the opening of the bottle body; The minimum elastic modulus of the bottle body is not less than 850MPa and the inner wall of the bottle is not bonded to EVOH; the inner bag includes EVOH layer and LDPE layer, and the EVOH layer and LDPE layer are bonded by adhesive, EVOH The layer is located on the outermost side of the inner bag; the air will not enter the inner bag from the outside of the bottle when the pump head is pressed and rebounded. The present invention has less use residue and good user experience; it can isolate the contents in the bottle and improve the quality and shelf life of the contents; it has unique design, simplified structure, low cost, and the shape and size of the bottle body is controllable and beautiful; after use The bottle body is separated from the inner bag, and there is no residual content in the bottle body, which can be recycled directly, which is energy-saving and environmentally friendly, and has great application prospects.

The invention relates to a three-dimensional network silicon carbide enhanced metal-based composite material and a preparation method thereof. The composite material comprises a metal matrix and a three-dimensional network silicon carbide ceramic enhanced phase. The three-dimensional network silicon carbide ceramic enhanced phase is obtained by siliconizing the surface of the three-dimensional carbon. The preparation method comprises the following steps: foaming and carbonizing a mixture of wood flour and short carbon fibers to prepare three-dimensional network carbon; and siliconizing the surface of the three-dimensional network carbon at a high temperature to prepare the three-dimensional network silicon carbide ceramic enhanced phase and carrying out cast-infiltration to the metal matrix to obtain the three-dimensional network silicon carbide enhanced metal-based composite material. In the composite material prepared by the method, the three-dimensional network silicon carbide ceramic is great in porosity and small in pore diameter, and the three-dimensional network silicon carbide is continuous in a three-dimensional space and forms metallurgical bonding with the metal matrix.Compared with a conventional silicon carbide particle enhanced metal matrix, the composite material has a better integral structure, and not only can play high hardness, high wear resistance and highheat resistance of the silicon carbide ceramic in the three-dimensional direction, but also can keep good toughness and heat and electricity conducting performance of the metal matrix. The prepared composite material shows excellent shock-resistant, impact-resistant and wear-resistant performance in various severe working conditions.

The invention relates to an ultrathin carbon membrane preparation method which comprises the following steps: forming a carbonization precursor layer on the surface of a first substrate, and carryingout in-situ carbonization on at least a part of the carbonization precursor layer by using a laser writing technique to obtain a dense ultrathin carbon membrane, wherein the first substrate has a thermal expansion coefficient of minus 5*10<6>-60*10<6> / K, the first substrate has a laser absorption coefficient of 0.01-3, and materials of the carbonization precursor layer at least comprise carbonizeable macromolecules; the thickness of the carbonization precursor layer is 10-2000nm; the thickness of the ultrathin carbon membrane is 3-600nm. The method provided by the invention is rapid and efficient, low in cost and feasible in large-scale production, sizes and patterns of the carbon membrane can be automatically controlled, and the carbon membrane has an ultrathin thickness.

The invention discloses a rolling and extruding combined forming method for ribbed thin-wall ring components with large height-diameter ratios. The rolling and extruding combined forming method includes steps of setting cover dies for constraining ring blanks and placing the ring blanks in the cover dies; driving main rollers to rotate by power systems of ring rolling mills to drive the cover dies to drive the ring blanks to rotate and linearly feeding core rollers to extrude the ring blanks to increase the heights of the ring blanks until the heights of the ring blanks are consistent with those of the cover dies; replacing the core rollers by extruding male dies; adjusting auxiliary rollers opposite to the main rollers to allow the auxiliary rollers to cling to the surfaces of the cover dies; driving the male dies by hydraulic cylinders to forwardly move and extrude ring components which are in contact with working surfaces of the male dies, and forming local mesh rib structures by means of extruding; allowing the male dies to return and allowing the auxiliary rollers to rotate at the low speeds to drive the cover dies to rotate clockwise by certain angles; repeatedly carrying out previous steps until integral mesh rib structures are formed on the surfaces of the ring components by means of extruding. The rolling and extruding combined forming method has the advantages that the integral ribbed thin-wall ring components with the large height-diameter ratios can be seamlessly formed in a near-net manner, surface rib structure welding forming can be replaced, cutting machining can be obviously reduced, accordingly, the manufacturing efficiency and the product quality can be improved, the manufacturing costs can be reduced, and the manufacturing ranges can be extended.

The invention discloses a preparation method of vanadium dioxide nanopowder, which comprises: 1) adding tetravalent vanadium salt into deionized water, stirring until completely dissolved to obtain solution a; 2) adding a precipitating agent into solution a, Adjust the pH to 8-12, stir for a period of time to obtain a suspension b; 3) separate the suspension b to obtain a precipitate c, disperse the precipitate c in deionized water, add hydrogen peroxide, adjust the pH to 3-6, and age at room temperature 1 to 6 hours to obtain the suspension d; 4) separate the suspension d to obtain the precipitate e, dry the precipitate e for a period of time, calcinate at 450-700°C for 1-5 hours under the protection of an inert gas, and cool to room temperature Afterwards, vanadium dioxide nanopowder is obtained. The invention has reasonable and ingenious design, simple preparation process, readily available raw materials, low reaction energy consumption, less environmental pollution, short production cycle, no need for expensive production equipment, low production cost, and easy large-scale production.