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

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 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 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 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 discloses a method for preparing onion-like fullerenes by a nanoparticle catalytic arc method. The method utilizes a direct current arc discharge method, uses spectrum graphite as a cathode, and spectrum graphite with a mixture in the middle hole as an anode. Under the condition of electric current, the anode graphite will gasify together with the mixture, nucleate and transform into onion-like fullerene, and under the protection of carrier gas, onion-like fullerene will be synthesized by arc discharge method. The process of the invention is stable, simple and fast, and the onion-like fullerene produced has a high degree of graphitization and low cost, and at the same time has important properties such as good bonding characteristics, electrical conductivity, and quantum mechanical effects, and becomes a new type of multi-functional compound that can meet special performance requirements. Functional materials have a wide range of applications and attractive application prospects.