93results about How to "Adjust shape" patented technology

The invention relates to the technical field of fiber manufacturing, and in particular relates to a preparation method of polymer fiber-based ZnO nanowire fiber. The preparation method comprises the following steps: (1) carrying out electrostatic spinning on a polymer solution and a ZnO precursor to obtain nano-fiber containing a polymer and the ZnO precursor; (2) carrying out low-temperature heat treatment on the nano-fiber to obtain the nano-fiber containing uniformly-distributed Zn nanoparticles inside; (3) by combining a hydrothermal method, putting the nano-fiber into a growth solution and growing for a period of time, so that the Zn nano-particles on surfaces of the nano-fiber and inside the nano-fiber are self-assembled and grow into ZnO nanowires, thereby forming the polymer fiber-based ZnO nanowire fiber. The polymer fiber-based ZnO nanowire fiber prepared by the preparation method has a good mechanical property and contains high-ratio nano zinc oxide.

The invention discloses a Na2Fe2(SO4)3@alumina composite material having a core-shell structure and a preparation method and an application thereof. The material is a composite material having the core-shell structure and prepared by coating the surface of Na2Fe2(SO4)3 particles with alumina. The Na2Fe2(SO4)3 is pyrolytically coated with an organic aluminum salt, the problems that Na2Fe2(SO4)3 is dissolved in water and is difficultly coated by alumina via a traditional hydrolysis method are overcome, the synthesis method is simple, conditions are mild, and the yield is high; the prepared composite material can effectively suppress a 'surface poisoning effect' of the material, and has the advantages of high specific capacity, high work voltage, good cyclic stability and excellent rate performance when applied as a sodium ion battery positive electrode material.

The invention discloses stretchable transparent conductive hydrogel and a preparation method thereof. The conductive hydrogel structure is formed by coating a conductive polymer with a cross-linked polymer network. The cross-linked polymer network can be polyacrylamide (PAAm) or polyacrylic acid (PAA); the conductive polymer is poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid (PEDOT:PSS). The hydrogel is prepared by a three-step synthesis method, which comprises the following steps: 1) freezing a mixed solution of PEDOT:PSS and ethylene glycol to obtain a PEDOT:PSS pre-reaction solution; 2) adding a cross-linked polymer network monomer, an initiator, a catalyst and an accelerator into the pre-reaction solution, and then carrying out thermal polymerization; and 3) finally, soaking the thermal polymerization product in a sulfuric acid solution to obtain the stretchable transparent conductive hydrogel. The preparation method can obtain the conductive hydrogel with excellent comprehensive performance, and the specific performance is high conductivity, high light transmittance, good stretchability, smooth surface, adjustable shape and thickness and the like.

The invention discloses a film electrode and a manufacturing method thereof and application. The electrode is composed of a conductive polymer film and a substrate, and is characterized in that the conductive polymer film has a conductive polymer grid structure; and the conductive polymer can be applied to the substrate such as glass, quartz, fiber, fabric, a plastic film and a polymer film to form the conductive film electrode. Particularly, when a flexible or an extensible transparent substrate is selected, a flexible and transparent film electrode can be manufactured. Patterned grid manufacturing can be realized through a printing method, the process is simple, convenient, economic and efficient, materials are saved, the structure can be controlled, the shape and the size can be adjusted randomly, and more importantly, large-area quick manufacturing can be realized. The electrode can be used as a transparent film electrode to replace an indium tin oxide (ITO) transparent electrode and can be widely used for building a flexible organic light-emitting device, a flexible organic solar cell device, a flexible organic field-effect transistor device or a flexible energy storage device.

A mitral valve annuloplasty ring and method for implanting a mitral valve annuloplasty ring to treat mitral insufficiency by reestablishing the normal shape and contour of the mitral valve annulus. The annuloplasty ring is flexible and can be readily adjusted to different sizes and shapes. The method substantially eliminates scarring subsequent to the annuloplasty procedure to maintain flexibility of the ring and the annulus indefinitely.

The invention discloses biomass-based N, S and P-containing co-doped porous carbon and an application thereof. The N, S and P-containing co-doped porous carbon is prepared successfully from palm kernel shell serving as a raw material through high-temperature carbonization and an activation method. The palm kernel shell is taken as waste biomass, so that a low-cost carbon source can be provided, and the heteroatoms of N, S and P are provided for a final product; in the presence of the heteroatoms, oxidation reduction pseudo-capacitance is provided; through heteroatom doping, irreversible change of oxygen-containing functional groups on the surface of a carbon material in charging and discharging processes can be suppressed; due to a synergistic effect shown after doping of the elements of N, S and P, the prepared carbon material shows an excellent electrochemical capacitance characteristic, and is a high-quality activated carbon production raw material.

The present invention discloses a method for preparing flower-like spherical calcium molybdate by chelating a chelating agent ethylenediaminetetraacetic acid (EDTA) and Ca<2+>. The method comprises: using calcium chloride and sodium molybdate as raw materials, respectively adding a certain amount of distilled water, carrying out magnetic stirring to uniformly mix, pouring the sodium molybdate into the calcium chloride solution during the stirring, continuously stirring for 15 min, carrying out an ultrasonic reaction for half an hour, centrifugating the precipitate, washing, and drying to obtain the flower-like spherical calcium molybdate. According to the present invention, the used raw materials such as calcium chloride, sodium molybdate, EDTA and the like are cheap and easy to obtain, the ultrasonic operation is easily performance, and the requirement on the equipment is low; and the prepared flower-like spherical calcium molybdate has advantages of large specific surface area and good photoluminescence property.

The invention discloses a method for using an emulsion electrospinning method to prepare a biodegradable polymer nanofiber membrane. The method includes preparing a biodegradable polymer solution with concentration of 0.05-0.2g/ml; mixing the biodegradable polymer solution with incompatible liquid and a surfactant, wherein volume ratio between the biodegradable polymer solution and the incompatible liquid is 1:50-1:10, stirring to obtain emulsion, and performing electrostatic spinning on the emulsion to obtain the biodegradable polymer nanofiber membrane. The method is simple and easy to implement and low in equipment cost, does not require to form completely-homogeneous electrospinning liquid, and is wider in application range when compared with conventional solution electrospinning technology, and structure and performance of the polymer fiber membrane can be further controlled by controlling property of the emulsion.

The invention provides a green synthesis method of a cadmium selenide nano-crystal with controllable shape and size. Natural vegetable oil is taken as a solvent and a ligand, different selenium sources and cadmium oxide are taken as precursors, the nano-crystal can be obtained by adjusting the ratio between the ligand and the precursors, with the size adjustable from 2nm to 13nm and the ratio between the length and diameter from 1 to 10; the nano-crystal has high degree of crystallinity, fluorescence quantum efficiency is 15 percent to 40 percent and fluorescence emission spectrum is 490nm to 660nm. The obtained point nano-crystal can maintain stable sphalerite structure under high temperature, with narrow size distribution, wherein, fwhm equals to 27 plus or minus 1nm. The obtained rod-shaped or multibranched (two-branch, three-branch, four-branch) nano-crystal has quite narrow size distribution, and wide fluorescence half band width, wherein, fwhm equals to 23 plus or minus 1nm. The obtained arc-shaped and random rod-shape nano-crystal has different radiuses of curvature, wurtzite, sphalerite, twin crystal and dislocation coexist in the same nano single crystal.

The invention relates to a bisamide chain organosilicon quaternary ammonium salt compound and preparation and application of the bisamide chain organosilicon quaternary ammonium salt compound and. The chemical structural formula (please see the formula in the specification) is provided, wherein X- is C1- or Br- or I-, m is any integer ranging from one to eighteen, and n is any integer ranging from one to five; the preparation comprises the steps of firstly, mixing N, N-double methylamine (3- aminopropyl) and fatty acid; secondly, adding solvent and performing temperature reaction to obtain a tertiary amine intermediate; finally, mixing the tertiary amine intermediate and halogen alkyl trimethoxysilane and performing temperature reaction; thirdly, the double amide chain organosilicon quaternary ammonium salt compound is obtained. The bisamide chain organosilicon quaternary ammonium salt compound can be applied to the preparation of hierarchical zeolite. The hierarchical zeolite prepared by the bisamide chain organosilicon quaternary ammonium salt compound can improve the pore volume and specific surface area of zeolite molecular sieve, effectively regulate the pore diameter and pore volume of hierarchical porous molecular sieve through changing the number of carbon atoms of double amide group chain, and further regulate and control the morphology of the hierarchical zeolite through the molar ratio of silicon dioxide in mother-liquid of quaternary ammonium cation surface active agents and the zeolite molecular sieve.

The invention relates to a barium strontium titanate ferroelectric nano single crystal particle and a preparation method thereof. Pure Sr(NO3)2, Ba(OH)2.8H2O and TiCl4 serve as raw materials, de-ionized water and 1,4-butanediol serve as reaction medium and oleic acid serves as surfactant; at the absence of mineralizer, the nucleation-growth process is controlled by alcohol heat action in an autoclave to synthesize and obtain barium strontium titanate ferroelectric nano single crystal particles. The barium strontium titanate ferroelectric nano single crystal particle prepared by the invention has the characteristics of accurate chemical composition, regular cubic appearance, near single dimension, favourable dispersion stability and the like. The ferroelectric nano single crystal material can be used for self-assembly aiming to the nanometer ordered array structure of super high density ferroelectric memory, and the microstructural characteristics of the invention have not been reported publicly so far.

The invention discloses a preparation method of a copper sulphide classified nanometer structure material. The method comprises the following steps of: uniformly mixing copper acetate, dimethyl sulfoxide and sublimed sulfur powder to react for 1-2 hours at 100-150 DEG C; and cooling, separating, washing and drying to obtain the copper sulphide classified nanometer structure material. The method has the advantages of mild reaction conditions, short reaction period, simple operation steps, good repeatability, less quantity of used raw materials, low toxicity, low-energy environment-friendly whole synthetic process, novel feature structure, controllability and the like. The invention also discloses the copper sulphide classified nanometer structure material, wherein the copper sulphide classified nanometer structure material is nest-shaped or multilayer disc shaped; and the feature of a product can be effectively adjusted by simply regulating reaction temperature and time so as to obtain the copper sulphide classified nanometer structure material with the nest-shaped or multilayer disc shaped feature; and the feature is novel in structure and uniform in structural size.

The invention discloses an air volume adjusting plate for a plug-in box. The air volume adjusting plate comprises a plate body matching the shape of the bottom of the plug-in box; a connection portion disposed on a side surface of the plate body; a connection port disposed on the connection portion and to be connected with the plug-in box; a plurality of vent holes arranged on the plate body regularly; and latches inserted into different vent holes and used for changing the air volume at different positions on the plate body. All the vent holes are arranged in parallel on the plate body in a plurality of rows. Each gap between guide rails in the plug-in box corresponds to at least one row of vent holes. The invention also discloses the application method of the air volume adjusting plate. The air volume adjusting plate ingeniously changes the air volume of different functional modules by the arrangement of the latches on the plate body. Thus, each module is ventilated and cooled on demand, the air volume of respective modules are reasonably distributed, the heat dissipation efficiency of a draught fan is improved, the cost of plug-in box is reduced integrally, and a good balance is made between the air volume and draught fan noise and power consumption. The air volume adjusting plate is ingenious in design, simple in structure, and easy to use.

The present invention relates to a catalyst composition for preparing a polyketone compound, the catalyst composition comprising: an onium salt compound having 5 to 40 carbon atoms and comprising a carboxylic acid group or a carrier surface-modified with a sulfonic acid group; and a palladium-based catalyst. Through the catalyst composition, the present invention can provide: a palladium mixed catalyst system capable of showing high activity and preventing fouling in the preparation of polyketone; a method for preparing a polyketone compound, the method being capable of preventing fouling, skipping the feeding of seeds, and attaining excellent stability and activity in a polymerization reaction, by using the palladium mixed catalyst system; and a polyketone polymer with a high apparent density prepared from the method.

The invention discloses a porous silicon material and its preparation method. The preparation method of the porous silicon material includes: letting a transition metal salt precursor and raw material silicon undergo an in situ catalytic reaction in an organic solvent under certain temperature and pressure and the action of a mineralizing agent, and carrying out pickling and other post-treatment impurity removal processes, thus obtaining the porous silicon material. By adjusting the variety and concentration of the transition metal salt precursor, the organic solvent variety and reaction condition parameters, the pore size, distribution and porosity of the silicon material can be regulated. By means of the method provided by the invention, the porous silicon material that is difficult to obtain by the prior art can be obtained. The porous silicon material prepared by the method has the characteristics of low production cost and simple process, can be prepared in large scale, is suitable for industrial production, and has wide application prospects.

The invention discloses a method for preparing a calcium lanthanum molybdate europium-doped luminous olive sphere. The method disclosed by the invention comprises the following steps: mixing a lanthanum nitrate solution, a calcium nitrate solution and a europium nitrate solution; adding a complexing agent and sodium molybdate, stirring at a normal temperature so as to obtain a reaction precursor solution; transferring the reaction precursor solution into a hydrothermal reactor for carrying out a hydrothermal reaction; cooling, centrifuging and washing after the hydrothermal reaction is ended, thereby obtaining the calcium lanthanum molybdate europium-doped luminous olive sphere sample. The preparation method disclosed by the invention is low in reaction temperature, low in equipment requirement and simple in operation; the prepared calcium lanthanum molybdate europium-doped luminous olive sphere is regular in morphology, uniform in size and excellent in luminous property.

The invention relates to a back bending device for dance training, which comprises a base, lifting supports and a waist supporting plate, the waist supporting plate is of an arc-shaped structure, a connecting beam is arranged in the axial direction of the inner arc of the waist supporting plate, and the connecting beam is arranged on the base through the two lifting supports; a foot limiting framefor limiting the feet and a back supporting frame for supporting the back are arranged on the lifting bracket; through cooperation of the base, the lifting support, the waist supporting plate and thesteel wire rope, the height and the shape of the waist supporting plate are adjusted so as to meet the requirements of different people, and meanwhile, under the action of the foot limiting frame andthe back supporting frame, the problem that auxiliary supporting is needed when the people bend the waist and get up after bending the waist is solved; and the waist of a person is prevented from being accidentally injured and the use safety is improved.

The invention discloses a lithium and sodium ion battery negative electrode material nickel pyrovanadate and a sol-gel combined annealing preparation method and application thereof. The method comprises the following steps: dissolving a vanadium source in distilled water, heating to 50-60 DEG C, adding a chelating agent, stirring until the chelating agent is completely dissolved, adding a nickel source, and stirring and heating at 60 DEG C to obtain a colloid; drying to obtain dry colloid; grinding the dry colloid, tabletting, sintering in an inert atmosphere at 300-450 DEG C for 5-6 hours, naturally cooling, and grinding to obtain a powdery material; and grinding and tabletting the powdery material again, sintering for 10-20 hours at the temperature of 650-900 DEG C in an inert atmosphere, and naturally cooling to obtain the nickel pyrovanadate negative electrode material. The material obtained by the method is uniform in particle and stable in structure, and shows excellent electrochemical performance. The method is suitable for producing the high-performance lithium ion and sodium ion battery negative electrode material nickel pyrovanadate [Ni2V2O7].

The invention provides a hollow LDH/MnO2 nanocage composite material as well as a preparation method and application thereof, and the preparation method comprises the following steps: by taking ZIF-67as a self-template, forming a hollow LDH nanocage in situ by adopting simple etching and hydrothermal reaction, and growing ultrathin MnO2 nanosheets on the hollow LDH nanocage to obtain the LDH/MnO2nanocage composite material with a hollow dodecahedron structure. The preparation method disclosed by the invention is simple and easy to control in preparation process, environment-friendly and suitable for large-scale industrial production. The hollow structure and synergistic effect of the composite material can fully expose active sites and accelerate the mass transfer process, and when the composite material is used as a positive electrode material for a lithium-air battery, the reaction kinetics can be accelerated, the charging overpotential can be reduced, and the cycling stability ofthe battery can be improved.

The invention discloses a ZSM-5 hybrid nanosheet molecular sieve with a medium silica-alumina ratio and a preparation method thereof, and belongs to the technical field of catalysts. The hybrid molecular sieve is composed of an internal microporous substrate and a nanosheet layer epitaxially growing outside the microporous substrate, the silica-alumina ratio range of the hybrid molecular sieve is adjustable in a range of 100-300, and the preparation method specifically comprises the following steps: 1) dissolving a micromolecule template agent, a silicon source and an aluminum source in water, and uniformly stirring to form gel; 2) aging under a stirring condition; (3) continuously adding a long-carbon-chain amphiphilic surfactant solution and uniformly stirring; 4) aging under the stirring condition; and 5) crystallizing to obtain the hybrid ZSM-5 molecular sieve. The preparation method solves the problem that the morphology of the molecular sieve is limited by the silica-alumina ratio of the nanosheet-block hybrid molecular sieve synthesized at the present stage, and breaks through the limitation that the growth of the outer nanosheet cannot be maintained if the silica-alumina ratio is reduced, and the prepared hybrid molecular sieve has great application prospects in the catalytic fields of preparation of low-carbon olefins and the like.

The invention provides a method for determining gear pump tooth profile molded line and a crescent gear pump. The method includes: provided a first formation circle, a second formation circle and a tooth circle; an eccentric distance for geometric compensation is arranged between the second formation circle and the first formation circle; a fixed point is determined on the circumference of the second formation circle, in the circle or outside the circle, so that the second formation circle rotates around the center of the first formation circle on the premise of keeping the first formation circle immobile; the locus of the fixed point forms a first epicycloid; a first distance is used for vector amplification on the first epicycloid to obtain a second epicycloid; and an envelope line formed by the center of the tooth circle moving along the second epicycloid used as the tooth profile molded line of the gear pump. Through the above technical scheme, the method is convenient for adjusting the shape, size and tooth gap of the tooth profile, so as to avoid large noise and ripple due to collision caused by larger gap.

The invention discloses a ZnO thin film structure which comprises a substrate, a nano forest arranged on the substrate and a ZnO layer deposited on the nano forest. The invention also discloses a preparation method of the ZnO film. The preparation method comprises the following steps of selecting the substrate; coating the substrate with a polymer layer to form a nano forest structure; and finallydepositing the ZnO layer on the nano forest structure. Compared with a traditional ZnO thin film, the ZnO thin film structure provided by the invention has the advantages that raw materials are reduced, the cost is reduced, and meanwhile, the ZnO thin film structure has the characteristics of high porosity and the large specific surface area of the nano forest. According to the preparation methodof the ZnO thin film structure, a magnetron sputtering method and a nano forest preparation process are combined, the thickness, the morphology, the growth direction and the density of the thin filmin the ZnO thin film structure can be adjusted through parameter control, the process is simple, and operation is convenient.