34results about How to "Easy to control shape" patented technology

The invention belongs to the technical field of nano materials, and discloses a foam metal-carbon nanotube composite material, and a preparation method and application thereof. The preparation method comprises the steps of pretreating a polyurethane sponge substrate, then putting the pretreated polyurethane sponge substrate in a chemical plating solution containing metallic elements to perform a chemical plating reaction, and drying the obtained product to obtain a foam metal catalyst with the polyurethane sponge substrate; then putting the foam metal catalyst in a tube furnace, heating the furnace to 500-550 DEG C, and feeding hydrogen for 0.5-2 hours; heating the furnace up to 600-800 DEG C, feeding an acetylene mixed gas to be used as a carbon source, and growing carbon nano material on the surface of the foam metal catalyst through chemical vapor deposition so as to obtain the foam metal-carbon nanotube composite material. According to the preparation method provided by the invention, carbon nanofibers or carbon nanotubes grow in-situ on the surface of a transition metal catalyst, so that the combination at the metal / carbon interface is tight, the carbon nanofibers or carbon nanotubes have good dispersity, and the tube diameters are controllable and uniform.

The invention provides a preparation method for vanadium sodium fluorophosphorate. The preparation method comprises the following steps: (1) preparing an acid-base-coupled extraction agent; (2) preparing a microemulsion phase containing PO4<3->; (3) with a sodium source compound, a vanadium source compound, a fluorine source compound and the microemulsion phase prepared in the step (2) as raw materials, dissolving the raw materials or dispersing the raw materials in an organic solvent; and (4) transferring a mixture obtained in the step (3) into a reaction vessel, heating the mixture to 80 to 140 DEG C for a reaction, then carrying out natural cooling to room temperature, then carrying out centrifugation, recovering an organic phase located at an upper layer and obtained after centrifugation so as to obtain the acid-base-coupled extraction agent and subjecting a precipitate to washing and drying so as to obtain vanadium sodium fluorophosphorate powder. The prepared vanadium sodium fluorophosphorate has the characteristics of good crystallinity and high purity; a nano-micro material thereof has excellent electrochemical performance; and more importantly, the acid-base-coupled extraction agent is recoverable and recyclable.

The invention discloses a special-shaped ceramic tile forming mold and a manufacturing method thereof, and belongs to the technical field of powder forming. The special-shaped ceramic tile forming mold comprises a middle frame, wherein an inner cavity of which the cross section is quadrangular is formed in the middle frame; and corners of the quadrangular inner cavity are right-angled. The special-shaped ceramic tile forming mold is characterized in that angle blocks are arranged on corners of side walls of the inner cavity, and the angle blocks and the side walls of the inner cavity form a mold cavity jointly in a surrounding manner. The angle blocks are arranged in the middle frame which has the traditional structure, and the angle blocks and the side walls of the inner cavity form the mold cavity for special-shaped ceramic tiles jointly in the surrounding manner, so that the difficulty on machining of the special-shaped inner cavity of the middle frame in the prior art is reduced greatly; center lines of the side plate mounting holes are perpendicular to the side walls of the middle frames; the method is the same with the traditional method of machining side plate mounting holes, the technical is mature, and machining is facilitated; and moreover, the angle blocks which serve as small objects can be precisely manufactured by mature technologies of edge milling or linear cutting in the prior art, and the shape of the mold cavity is convenient to control.

The invention discloses a preparation method of a unstratified metal sulfide nanosheet. The preparation method of the unstratified metal sulfide nanosheet comprises the following steps: dissolving metal salt and a sulfur source in an organic solvent, and uniformly mixing for reacting to obtain a first muddy solution; heating till the first muddy solution is clear and transparent, introducing inertia gas, performing an illumination reaction, and then cooling to room temperature to obtain a second muddy solution; washing, centrifugally separating and drying to obtain the unstratified metal sulfide nanosheet. The preparation method provided by the invention has the advantages of few raw material kinds, simple process, mild conditions, universality and controllable nanosheet appearance. Moreover, the unstratified metal sulfide nanosheet prepared by the method is small in thickness, being 1.2 to 9 nm, and has high anisotropy and crystallinity, and good application prospects.

The invention relates to a combined type heat-insulating baffle which is applied to directional solidification equipment and is used for increasing monocrystal solidification temperature gradient. The combined type heat-insulating baffle comprises graphite rings and a flexible graphite felt, wherein the graphite rings and the flexible graphite felt are combined into an annular body, the inner diameter of which is more than the outer diameter of a shell mould to be cast; and the graphite rings are divided into two layers, the upper-layer graphite ring is directly placed on a water cooling sleeve in a directional solidification furnace, the flexible graphite felt is filled between the two layers of graphite ring, a height difference exists between the height of the inner diameter of the upper-layer graphite ring and the height of the outer diameter of the upper-layer graphite ring, and the height from the inner diameter to the outer diameter is increased in a smooth transition manner. The combined type graphite high-temperature heat-insulating baffle disclosed by the invention is convenient to manufacture by just clipping the flexible graphite felt according to dimensions and placing the clipped flexible graphite felt on the graphite rings on the water cooling sleeve as well as directly placing the second-layer graphite ring on the graphite felt, no bolts and nuts are needed for fixation, the placement is convenient and the price cost is low. Compared with the prior art in which a hard graphite felt is used as the heat-insulating baffle, the combined type heat-insulating baffle has the advantage that the temperature gradient is increased by almost 50%.

The invention discloses a three-dimensional "photo frame and photo" structure nano-gold material, which includes gold nanoparticles and a discontinuous gold shell layer in a three-dimensional frame structure covering the gold nanoparticles; its synthesis method includes: providing a core Gold and silver nanoparticles with shell structure, including gold nanoparticle crystal core and silver-coated nanoshell layer; after the selected molecules are modified on the surface of gold and silver nanoparticles, they are placed in a selective solvent to make the selected molecules collapse or stretch , thereby forming discontinuous nano-regions on the surface of the gold-silver nanoparticles, and the silver nano-shells in the nano-regions are exposed; the gold-silver nanoparticles are at least reacted with chloroauric acid to form the target product. The invention provides a new type of discontinuous growth mode, which is simple in process and easy to control, and can effectively synthesize three-dimensional "photo frame and photo" structure nanomaterials. This nanomaterial has unique optical properties and is useful in catalysis, sensing and detection, etc. It will have a good application prospect.

The invention provides a carbon black polymer combined counter electrode of a dye-sensitized nano crystal solar battery. The carbon black polymer combined counter electrode of dye-sensitized nano crystal solar battery comprises a base material and a composite material which is covered on the base material, wherein the composite material comprises a mixture A, polyoxyethylene, polyfluortetraethylene-P-hexafluoropropylene, carbon black and a silane coupling agent, wherein the mixture A is prepared by mixing propylene carbonate and ethylene glycol dimethyl ether. The invention further discloses a preparation method of the counter electrode. Compared with prior art, the invention has the advantages that carbon materials with high catalytic activity and low price are used for replacing platinum, so that production cost of a battery is lowered, and photoelectric conversion efficiency equivalent to that of a platinum counter electrode can be obtained.