111results about How to "Enables macro-preparation" patented technology

The invention discloses a metal-organic framework nanocrystal loaded polyurethane foam as well as a preparation and an application thereof. Polyurethane prepolymer and active amino on MOFs (Metal-Organic Frameworks) are taken to perform chemical doping, the great challenge that MOFs materials are difficult to process is overcome, MOFs nanoparticles are uniformly loaded in the polyurethane foam, a foam reactor is obtained by means of in-situ forming, a new process of building a complex mesoporous-microporous assembly based on microporous metal-organic skeleton nanoparticles as structural units is provided to observe catalysis of the MOFs nanoparticles on knoevenagel condensation; as water serves as a foaming agent and a green chemical method is adopted to prepare an integral flow-by foam reactor to catalyze an organic reaction, aftertreatment of a catalyst is simplified, loss of the catalyst is avoided, continuous flow-by cyclic catalyzation can also be performed, and a new method is provided for the treatment of environmental pollution and chemical industry.

The invention discloses a method for preparing carbon quantum dots by using a conjugated polymer, which is characterized in that an aqueous solution with 0-1M of acid or alkali possessing the mass of 0.01-1000 times of conjugated polymer is added in the conjugated polymer, and uniformly mixing to obtain a reaction liquid; the uniformly mixed reaction liquid is placed in a reactor, reacted for 1-24 hours under the temperature of 100-500 DEG C; cooled to the room temperature after the reaction, the reaction liquid is collected, separated and purified to obtain the carbon quantum dots. The carbon quantum dots have the advantage of low cost, realization of macro quantity preparation, good water solubility and no toxicity, and are an inorganic nonmetal nano material having great application prospect in the fields of biological labeling, fluorescent sensing, cancer treating by photothermy.

The invention relates to the technical fields of micro-nano structures and photocatalysis, in particular to a g-C3N4 nanosheet with a monodisperse structure and a preparation method of the g-C3N4 nanosheet. The size of the g-C3N4 nanosheet with the monodisperse structure is 10 to 50nm; particles are uniformly distributed, so that the agglomeration phenomenon is avoided. The g-C3N4 nanosheet is prepared by a secondary calcination method under the condition of water vapor atmosphere, is mild in preparation conditions and can be prepared in macroscopic quantity; the g-C3N4 nanosheet with the monodisperse structure is large in specific surface area and good in dispersity, has higher reactive sites, and can be effectively applied to photocatalytic degradation of organic matters and production of hydrogen by water photodecomposition.

The invention discloses a chemical preparation method of a metal cobalt nanowire, relating to a preparation method of metal cobalt powder. The method adopts a soft mould method to prepare the metal cobalt nanowire in a self-assembly way. The method is characterized of comprising the steps of: jointly forming into the soft mould with ethanediol and surface active agent; taking hydrazine hydrate as reducing agent to reduce cobalt ions in cobalt salt into cobalt atoms; and directionally growing cobalt crystal nucleus under the function of the soft mould to form into linear shape. The diameter of the prepared cobalt nanowire is 100-800 nm, length is 2.0-10.0 um, length-diameter ratio is 12-25, and powder is pure cobalt. The method has simple technology and low cost, can realize large-scale economic preparation, and provides precondition for the practical use of the cobalt nanowire.

The invention relates to a method for preparing a porous carbon based nanomaterial through carbon dioxide conversion. The method comprises the following steps: 1, placing metallic magnesium in a high temperature furnace, heating the metallic magnesium in the argon protection atmosphere to 500-650DEG C in a heating rate of 5-10DEG C / min, letting in CO2 according to a CO2:Ar flow ratio of 1:4-4:1, reacting for 5-30min, closing the CO2 flow, and cooling in the argon atmosphere to room temperature to obtain black powder; and 2, reacting the black powder with an acid solution having a concentration of 2-8mol / L for 12-24h, fully washing with deionized water to neutrality, and drying to obtain porous graphene. A product obtained in step 1 when the reaction temperature is 700-900DEG C is porous carbon nanotubes, and a product obtained in step 1 when the reaction temperature is 950-1100DEG C is hollow carbon nanocubes.

The invention relates to a graphene-based novel material and a chemical vapor deposition preparation technology thereof, in particular to graphene foam with a three dimensional fully connected network and a macroscopic quantity preparation method thereof. The method is suitable for a mass preparation of the graphene foam with high qualities. Three dimensional connected graphene can grow by catalytic cracking of carbon source gases on the surface of a three dimensional porous metal through the chemical vapor deposition technology, and a porous foam-shaped graphene three dimensional macroscopic body can be obtained after a porous metal base is removed by dissolving subsequently. According to the graphene foam with the three dimensional fully connected network and the macroscopic quantity preparation method thereof, a simple template replication method is used for preparing the three dimensional connected graphene macroscopic body, and the method has the advantages that the operation is simple and convenient, the rate of production is high, and the adjustment and control of the structure are easy. The graphene foam forms the fully connected network in a seamless connection mode, has a low density, a high porosity and specific surface area and excellent capabilities of charge conduction and heat conduction and establishes a foundation for applications of graphene in fields of electric conduction, thermally conductive composite materials, electromagnetic shielding, wave absorbing, catalysis, sensing and energy storage materials and the like.

A process for chemically preparing Ni nanowires includes such steps as using ethanediol as solvent to prepare solution, reacting to generate Ni(OH)2, precursor, and reduction reaction of Ni ions, where the soft template is formed by ethanediol, nickel sulfate is used as main salt and hydrazine hydrate is used as reducer, to form Ni nanowires by autoassembling.

The invention provides a chemical method for preparing spherical porous hollow nanometer cobalt powder and relates to the chemical method for preparing nanometer cobalt powder materials. According to the chemical method, hydrazine hydrate and potassium borohydride are used as reducing agents to restore metallic cobalt and iron ions to metallic cobalt and iron atoms in specific solvent, metal atoms re-associate and grow up, and ferrocobaltnano-alloy particles are obtained finally. Then de-alloying for the prepared spherical ferrocobaltnano-alloy particles is conducted in acid solutions or acid mist with certain concentration to remove iron elements, and the spherical porous hollow nanometer cobalt powder particles are prepared out. The chemical method for preparing the spherical porous hollow nanometer cobalt powder is simple in technology, low in raw material cost and convenient to operate; in addition, by means of the chemical method, the spherical porous hollow nanometer particle powder can be prepared out at normal temperature and pressure and conditions are provided for practical application of the nanometer cobalt powder.

The invention discloses a preparation method of polyatomic co-doped molybdenum disulfide. Specifically, the method comprises the following steps: firstly, uniformly dispersing a plurality of doped atom precursors with a molybdenum source in sequence, then reacting with a sulfur-containing compound at a certain temperature, finally, carrying out solution treatment, and carrying out suction filtration and drying to obtain a target product. The material prepared by the method has a clear structure, a single crystal image and no cluster or non-molybdenum disulfide crystal image formation. The types and the contents of the doped heteroatoms are easy to modulate. The material has excellent activity when being used for electrocatalytic hydrogen evolution reaction. The method is a universal methodfor preparing polyatomic co-doped molybdenum disulfide, and has the characteristics of being simple and easy to operate.

The invention discloses a method for preparing functionalized graphene through Mannich reaction. The method comprises the following steps of: reducing oxidized graphene by taking plant polyphenols and derivatives of the plant polyphenols as reducing agents to obtain the polyphenol modified graphene; and then preparing the functional graphene with amphipathy through Mannich reaction between polyphenol groups on the surface of the graphene and polyether amine. The method disclosed by the method has the advantages of mild preparation conditions, simple and efficient purification process and no-purification of intermediate products. Simultaneously, raw materials for preparation of the functionalized graphene comprise the reducing agents and a modifier and have the characteristics of rich sources and low cost, and therefore, the functionalized graphene and colloids thereof can be efficiently prepared on a large scale. The functionalized graphene can be used for directly preparing a graphene hybrid material with excellent electric conductivity and toughness, has very good solvent dispersivity and excellent storage stability, and is suitable for compounding with various polymers to prepare a polymer / graphene composite material with high performance.

The invention provides a preparation method of a porous boron carbonitride nanosheet and a preparation method of a porous boron nitride nanosheet. The preparation method of the porous boron carbonitride nanosheet comprises the steps of mixing a boron source and a solvent, performing heating and dissolution, adding a carbonitride source, placing in a closed reaction vessel, performing heating and stirring, evaporating water, and performing grinding and heat treatment in inert gas to obtain the porous boron carbonitride nanosheet. The preparation method of the porous boron nitride nanosheet comprises the steps of performing heat treatment on the porous boron carbonitride nanosheet in ammonia, and cooling to a room temperature in inert gas to obtain the porous boron nitride nanosheet. The porous boron carbonitride nanosheet and the porous boron nitride nanosheet are applied to an absorbing material which has higher CO2 absorbing performance, separation performance and cyclic absorbing performance.

The invention discloses a method for growing a spiral carbon nanotube on porous carbon derived from timber. The method is characterized in that the carbon nanotube is subjected to chemical vapor deposition on the carbonized wood, space constraint effect of a natural vertical tube of the carbonized wood and the shearing contraction effect of the mixed acid on the carbon nanotube are used, and the spiral carbon nanotube with a uniform morphology height is prepared at the carbonized wood. The spiral carbon nanotube can increase the conductivity of the carbonized wood, and obviously increases themechanical property of a composite material. The composite material can be used as a super capacitor electrode, the natural vertical tube can provide an enough space for introducing other nano-materials, and a composite electrode does not require addition of a binder and a conductive agent. The elastic interleaving network of the spiral carbon nanotube is in favor of transmission of electrolyte ions, and an application of the composite material in the field of energy storage can be widened. The method has the advantages of simple technology, short production period and easy control, and can realize macro-preparation of the spiral carbon nanotube.

The invention relates to the field of structural control preparation of single-walled carbon nano-tubes, particularly to a macro and controllable preparation method of large-diameter and narrow-diameter distribution single-walled carbon nano-tubes. According to the present invention, the macro preparation of large-diameter single-walled carbon nano-tubes is achieved by using a floating catalyst chemical vapor deposition method, such that the macro and controllable preparation of the single-walled carbon nano-tubes with diameters of greater than 2 nm and narrow diameter distribution is achieved, wherein the diameters of more than 95% of the carbon nano-tubes are distributed within 2.1-2.7 nm, the diameters of more than 87% of the carbon nano-tubes are distributed within 2.1-2.5 nm, the single-walled carbon nano-tubes have characteristics of high purity and less impurities, the residual amount of the catalyst is less than 4.1 wt%, he single-walled carbon nano-tubes have high crystallinity, and the highest anti-oxidation temperature is 809 DEG C; the single-walled carbon nano-tube fibers spun by a liquid phase method have high electrical conductivity, provide the material basis for the research on the nanometer confinement effect of single-walled carbon nano-tubes and the singular physical and chemical properties of materials filled in tubes, and are expected to be applied to thefields of catalysis, biology, medicine and the like.

The invention provides a method for controlled macroscopic preparation of a molybdenum disulfide nano strip. The method comprises the following steps of (1) putting a certain amount of sulfur-containing mixture and a molybdenum trioxide template on two trays separately and then putting the two trays into two temperature zones of a dual-temperature zone tube furnace separately; (2) heating the temperature zone with the molybdenum trioxide template to 200-1500 DEG C and carrying out heat preservation for 1min to 5h; (3) heating the temperature zone with the sulfur-containing mixture to 100-900 DEG C and carrying out heat preservation for 1min to 5h; and (4) stopping heating after heat preservation is completed, and obtaining the molybdenum disulfide nano strip on the edge of a molybdenum disulfide nanosheet after cooling a hearth of the dual-temperature zone tube furnace. The production equipment is simpler; compared with an existing physical preparation method, expensive electronic beam (ion beam) equipment is not needed and the cost is low; the product molybdenum disulfide nano strip is stable in property and controllable in thickness.

The invention discloses a natural silk micro-nano-fiber preparation method, and belongs to the technical field of micro-nano material preparation. According to the preparation method, the diameter ofa fiber can be adjusted and controlled within the range of 20nm-2000nm at random. According to the method, the acting force between micro-fibers of natural silks is weakened or removed, a hierarchicalstructure of meso-scale of the natural silks is deconstructed, and micro-nano-fibroin fibers with controllable sizes are acquired. The method includes the steps: pretreating natural silks in 0.6-5.0%of sodium carbonate solution; mechanically loosening the acquired fibroin fibers in a calcium nitrate / saturated mono-fatty alcohol / deionized water ternary system with the temperature of 45-70 DEG C to obtain micro-nano-natural silk fiber solution; centrifuging, extracting, filtering and washing the solution to obtain the purified natural silk micro-nano-fiber. A preparation process is green, simple, convenient and controllable, the natural silk micro-nano-fiber is high in yield, size adjusting range is wide, and industrialization is easily achieved.

The invention discloses a preparation method of heteroatom doped porous molybdenum disulfide coated graphene. Specifically, the method comprises the following steps: wrapping a template agent with graphene oxide, with the mass ratio of the template agent to the graphene oxide being 20:1 to 1:10; then dispersing a metal ion salt on the abovementioned sample; carrying out a reaction with a sulfur-containing compound at a certain temperature; and finally removing the template agent to obtain the target product. The material prepared by the method has a regular spongy three-dimensional pore channel structure, and the outer walls of the graphene single pores are uniformly covered with heteroatom-doped molybdenum disulfide single pores. The material has high activity and good cycling stability when being used for an electrocatalytic hydrogen evolution reaction. The method is simple and easy to operate.

The invention discloses a method for purifying oxidized graphene. The method is characterized in that an easy layering phenomenon of a high-acidity oxidized graphene solution and deionized water is employed, oxidized graphene is purified in advance for repeatedly multiple times, then ultrasonic dispersion is carried out to prepare the oxidized graphene solution, finally, the oxidized graphene solution is sealed in an organic polymer synthetic fabric bag, dialysis is carried out in a cycle deionized water pool to prepare the high-purity oxidized graphene solution, and performing freeze drying to obtain the oxidized graphene powder. The method has the advantages of simple and easy control, and low cost of raw materials, equipment investment cost with high price during an industrial production process can be avoided, and low cost industrial preparation of the oxidized graphene material can be realized.

The invention relates to the field of controllable preparation of high-quality single-walled carbon nanotubes with low catalyst content and no sulfur impurities, in particular to a controllable preparation method for a single-walled carbon nanotube without sulfur impurities by a growth promoter. According to the method, selenophen is used as a precursor of the growth promoter, ferrocene is used asa catalyst precursor, and selenophen and ferrocene are dissolved in a toluene solvent; the formed solution is converted into aerosol by an ultrasonic nozzle, and then the aerosol is brought into a high-temperature zone by a carrier gas to catalyze ethylene decomposition and nucleation for growing a high-quality high-purity (IG / ID reaches 180 and the catalyst content is lower than 4.5 wt.%) single-walled carbon nanotube without sulfur impurities. The present invention uses selenium instead of sulfur as the growth promoter to achieve preparation of the high-quality single-walled carbon nanotubewith low catalyst residue and without sulfur impurities; and at the same time, hydrogen sulfide gas which is difficult to separate is avoided in tail gas of carbon nanotube growing, thus treatment and recycling of the tail gas are facilitated, and mass preparation of the high-quality single-walled carbon nanotube with a low catalyst content is achieved.

The invention provides a preparation method, a product and application of a nitrogen-doped axial carbon fiber / graphene loaded cobalt nano electrocatalyst, cellulose and a nitrogen source are taken asraw materials, a graphene fiber axial composite nitrogen-doped graphene lamellar structure is formed by high-temperature in-situ carbonization, and meanwhile, Co nano particles are loaded to obtain aMott-Schettky heterojunction. The method is simple in process, easy to control, green and safe, and can realize macro preparation. The nitrogen-doped axial carbon fiber / graphene loaded cobalt nano electrocatalyst prepared by the invention has relatively high catalytic activity, and shows relatively high electrocatalytic hydrogen production rate at different scanning rates.

The invention belongs to the technical field of metal nanosheets, and relates to a preparation method of a metal nanosheet, the metal nanosheet, application and a cathode active material. The preparation method of the metal nanosheet comprises the following steps that metal foil is provided, the surface of the metal foil is coated with an organic coating, then the metal foil coated with the organic coating is folded and pressed multiple times, and a metal-organic coating composite sheet is obtained; and a metal sheet and the organic coating in the metal-organic coating composite sheet are separated to obtain the metal nanosheet. The technology is simple, implementation is easy, the technological process is simplified, and the selection range of two-dimensional nanocrystallization metal canbe expanded; the material preparation cost can be reduced, and chemical waste liquid can be reduced; and the preparation methodis green and environment-friendly, energy consumption is low, and a two-dimensional metal nanomaterial high in purity and good in quality can be obtained.

The invention proposes a graphene tightly coated SiO negative electrode material and a preparation method thereof, and solves the problem in the prior art that the theoretical capacity of a battery negative electrode silicon-based raw material is low and the cycle performance is poor. The preparation method of the graphene tightly coated SiO negative electrode material comprises the following steps: step 1), preparation of a surface modified graphene oxide solution; step 2), preparation of an SiO dispersion; step 3), preparation of a graphene oxide coated SiO composite; and step 4), preparation of a graphene coated SiO composite. The method of the invention can completely realize the compact ultra-thin film coated SiO composite of graphene, and the method has the advantages of being simplein preparation process, low in cost, short in cycle and environmentally friendly, and can realize macro preparation.

The invention discloses a method for simply and massively preparing a graphene dispersed molybdenum base sulfide catalyst. The method is characterized in that the catalyst is obtained in one step through direct ball milling of graphene, a molybdenum base sulfide precursor and a reducing agent, and the activity of the catalyst can be effectively adjusted by changing the ratio among raw materials, the ball milling time, the rotating speed and energy. The method has the characteristics of simplicity, easy operation and control, and convenient and fast realization of large scale production.

The invention relates to chemical preparation of nanopowder materials, in particular to a chemical preparation method of cobalt-iron alloy nanopowder. The method includes: with hydrazine hydrate and potassium borohydride as reductant, using the hydrazine hydrate to reduce metallic cobalt and iron ions in specific solvent into light pink sticky cobalt-iron precursor; using potassium borohydride solution dissolved with the specific solvent, to reduce the light pink sticky cobalt-iron precursor into metallic cobalt and iron atoms, and allowing the atoms to re-gather and grow into cobalt-iron alloy nanoparticles. The method has the advantages the cobalt-iron alloy nanopowder can be prepared by the method, particle morphology is under control, the prepared cobalt-iron alloy nanoparticles are spherical with the particle size of 50 to 800 nm, evenly distributed, and conditions are created for the actual application of the cobalt-iron alloy nanopowder.

The invention belongs to the technical field of preparation of materials, and relates to a universal method for preparing a porous carbon material based on organic zinc salt. The method utilizes the commercial organic zinc salt as a precursor, and the porous carbon material can be obtained by means of one-step calcination. The obtained sample has high specific surface area, porosity, electrical conductivity, chemical stability and physical stability. As an absorbent material, the porous carbon material has very good CO2 absorption and separation properties; as a supercapacitor electrode material, the porous carbon material has a very high capacitance. In addition, the preparation method of the porous carbon material is simple, and the required precursor is the commercially available, cheapand easily-obtained zinc-containing organic salt; the method is low in price of the raw materials, wide in raw material source, simple in preparation and good in process repeatability, can realize macro preparation, and facilitates scale-up production.

The invention discloses a macro preparation method of tobacco thermal reaction spice. The macro preparation method comprises two procedures of extraction and concentration, and comprises the followingsteps: granulating tobacco powder serving as a raw material to obtain tobacco particles, performing destructive distillation extraction on the tobacco particles under the protection of nitrogen, andperforming reduced pressure distillation and concentration on the obtained extract to obtain the tobacco thermal reaction spice. The adopted tobacco particles are large in stacking density, the reaction feeding amount is large, and the yield of the extracted thermal reaction spice is high.

The invention relates to a composite photocatalyst and an application thereof. The composite photocatalyst comprises an N2 activation cocatalyst, a photogenerated hole capturing cocatalyst and a photocatalyst serving as a carrier and providing a photogenerated carrier; the N2 activation cocatalyst is alkaline earth metal oxide; the photo-generated hole trapping cocatalyst is CoOx or NiOx, whereinx is larger than or equal to 1 and smaller than or equal to 1.33; the photocatalyst serving as the carrier and providing the photo-generated carrier is TiO2 or / and g-C3N4. The composite photocatalysthas huge scientific value and practical significance for preparation of high-activity photocatalytic synthetic ammonia materials and construction of a mild and low-energy consumption photocatalytic synthetic ammonia system.

The invention provides a preparation method of a meter-scale large single crystal high-index surface copper foil. According to the method, commercial polycrystalline copper foil is used as a raw material, and a series of meter-scale large-single-crystal high-index-surface copper foils such as Cu (112), Cu (113), Cu (122), Cu (133), Cu (223), Cu (233), Cu (355) and other high-index surfaces are prepared by using a process of oxidation protection in advance and annealing. The method proposed by the invention can solve the problems that Cu (112), Cu (113), Cu (122), Cu (123), Cu (133), Cu (223),Cu (233), Cu (355) and other high-index surface single crystal copper foils are high in price and preparation cost, and no product is supplied on the market. Macro preparation of high-quality meter-scale large single crystal Cu (112), Cu (113), Cu (122), Cu (123), Cu (133), Cu (223), Cu (233), Cu (355) and other high-index surface copper foils is realized through a very simple method.

The invention discloses a preparation method of pod-shaped carbon nanotube encapsulation non-noble metal nano-particles. Particularly, the preparation method is based on a solvothermal method, and the non-noble metal nano-particles are generated through the direct reaction of alkali metal or derivatives and second metallocene compounds at low temperature. The prepared carbon nanotube is in a neat pod-shaped structure, and the metal nano-particles are in an elementary substance state. The preparation method of the pod-shaped carbon nanotube encapsulation non-noble metal nano-particles has the advantages of being simple and easy to operate and control.

The invention provides a method for preparing graphene used in a battery. The method comprises the specific steps: (1) preparation of a graphene oxide solution: using natural flake graphite as a raw material, and preparing graphite oxide by a modified Hummers method; performing ultrasonic dispersion on prepared graphite oxide in water, centrifuging the material to remove unpeeled graphite, and preparing a graphene oxide solution; (2) quenching of the graphene oxide solution in liquid nitrogen: performing compound ultrasonic treatment on the graphene oxide solution and a surfactant-added Fe3O4solution, heating and boiling the materials, and quenching the materials in the liquid nitrogen until the materials are completely frozen, and then performing in-situ freeze-drying to obtain the graphene oxide nano-rolls; and (3) graphene oxide nano-roller reduction: heating the dried graphene oxide nano-roll for reduction or performing chemical reduction to obtain a graphene nano-roll composite material. The method of the invention is simple and easy to control, has a short preparation period, and can realize low-cost macro preparation of graphene-based composite materials.