315results about How to "Complete crystal form" patented technology

The invention relates to a method for preparing a ferroferric oxide / graphene magnetic nano composite material by a solvothermal one-step method. The method comprises the following steps: by using ferric chloride hexahydrate and graphite oxide as raw materials, sodium bicarbonate as an alkali source, ethylene glycol and water as the solvent and polyvinylpyrrolidone as a surface active agent, dissolving graphite oxide, ferric chloride hexahydrate and polyvinylpyrrolidone into a mixed solvent of ethylene glycol and water, and carrying out ultrasonic treatment to obtain mixed solution A; dissolving sodium bicarbonate into ethylene glycol and carrying out ultrasonic treatment to prepare mixed solution B; after mixing the mixed solution A and B, reacting at 150-200 DEG C and at the pressure of less than 2.5 MPa for 4-12h, and then carrying out aftertreatment to obtain the ferroferric oxide / graphene magnetic nano composite material, wherein the ferroferric oxide particles are uniform, the distribution is narrow and the grain size is 10-30nm. The method is simple and convenient in process, environment-friendly and suitable for batch production.

The invention relates to the technical field of sodium ion batteries, and particularly provides a sodium transition metal oxide with a P3 structure and a preparation method thereof, and a sodium ion battery. The sodium transition metal oxide with the P3 structure has a general formula shown in the specification: NaxNiaMnbMcO2+d, wherein, 0.9<=x<=1.1, a>0, b>0, c>=0, a+b+c=1, d>=0, M is selected from one or more of Cu, Mg, Fe, Zn, Ti, Co and Al. The sodium transition metal oxide with the P3 structure has a stable P3 crystalline phase structure, does not have sodium defects, can solve the problems of sodium ion deintercalation, air instability and the like of the conventional sodium ion battery positive electrode material after being used as a sodium ion battery positive electrode active material to prepare a sodium ion battery, and is beneficial to the commercial application of the sodium ion battery.

The invention discloses an yttrium-doped aluminum nitride diluted magnetic semiconductor quasi-array microtube and a fabrication method of the microtube, which belong to the technical field of semiconductor spinning electron device materials. The yttrium-doped aluminum nitride diluted magnetic semiconductor quasi-array microtube is in a hexagon column structure, the outside surface of the microtube is smooth, and uneven folds are formed in the microtube, so that a multi-hole structure is formed. The fabrication method comprises the steps that Al powder and Y powder are taken as raw materials, nitrogen is taken as reaction gas, the fabrication is conducted in a direct-current arc plasma discharging device, a reaction chamber is vacuumed, the reaction gas is filled into the reaction chamber for discharging, the power is cut off after 3-5 minutes of the discharging reaction, and plush blocks are collected in a cathode sediment zone of a tungsten rod after standing and argon passivation. Fabricated samples are large in output, high in purity, complete in crystal form and uniform in size; the fabrication time is short; and the energy consumption and cost are low. No substrates, templates or catalyzers are needed in the fabrication process, and the fabrication method is environment-friendly and high in repeatability.

The invention belongs to the field of metallurgy and relates to a method of recovering copper and nickel from plastic plated parts. The method is mainly characterized in that by means of sulfuric acid leaching and using hydrogen peroxide and air or oxygen as oxidizing agents, a micro-bubble generator is used to blow the air or oxygen into a reactor in a micro-bubble form, leached solution is treated by cyclone electrowinning to produce cathode copper, anode liquor is frozen and crystallized to produce crude nickel sulfate, and the crude nickel sulfate is subjected to the steps such as dissolving, impurity removal by extracting, evaporation concentration, and cooling crystallization to produce high-purity nickel sulfate. The method has the advantages that reaction speed is high, no other impurities are introduced, metal recovery rate is high, solution circulates in a closed loop, no wastewater or waste residue is produced, few auxiliaries are used, energy consumption is low, and low carbon, energy conservation and emission reduction can be achieved.

The invention relates to a method for preparing nano nickel borate whiskers. The nano nickel borate whiskers are prepared by a sol-gel method, and the method comprises the following steps of: (1) adding water into inorganic nickel salt, boric acid and citric acid in an amount-of-substance ratio of 1:1-10:1-10 to prepare aqueous solution, controlling the concentration of the inorganic nickel salt in the aqueous solution to between 0.1 and 2.0mol / L, stirring at room temperature for 2 to 72 hours, and drying at the temperature of between 40 and 300 DEG C to obtain coffee dried gel; (2) sintering the dried gel obtained by the step (1) at the temperature of between 500 and 1,500 DEG C for 2 to 72 hours in air atmosphere to obtain green powder; and (3) post-treating the green powder obtained by the step (2) to prepare the nano nickel borate whiskers shown as Ni3B2O6. Compared with the traditional molten salt growth method, the method has the advantages of simple formula, easy operation, high yield, low sintering temperature and the like, and is favorable for industrialization.

The invention discloses a method for preparing an orientation arrangement Nb2O5 nanorod through single-reagent self reaction. The method comprises the following steps that (1) potassium fluoniobate powder is selected and dissolved in deionized water; a potassium fluoniobate dilute solution is put into a pretreated noble metal tube; sealing is performed; (2) the noble metal tube is put into a hydrothermal reaction kettle for sealing; the temperature in the hydrothermal reaction kettle is regulated to 200 to 500 DEG C; inert gas or deionized water is used for regulating the pressure in the hydrothermal reaction kettle to be 50 to 200MPa; hydrolysis reaction is performed for 12 to 24h; after the reaction is finished, the reaction kettle is subjected to temperature reduction to room temperature; (3) the hydrothermal reaction kettle is opened; the noble metal tube after the reaction is taken out and opened; residual solution is recovered; samples are collected; the orientation arrangement Nb2O5 nanorod is obtained. The method has the advantages that the single reagent is used as a synthetic raw material; the raw materials are simple and can be easily obtained; the cost is low; the energy consumption is low; the Nb2O5 nanorod obtained through preparation has good crystal form; the directionality is obvious.