50results about How to "Morphology regulation" patented technology

The invention discloses a cuprous oxide nanocrystalline with adjustable morphology and dimension as well as a preparation method and an application thereof. The preparation method comprises the following steps: copper hydroxide which is used as a precursor is synthesized; the pH value of the system is regulated; the system whose pH value is regulated is reduced in order to obtain cuprous oxide nanocrystalline. A surfactant is not needed to add, the cuprous oxide nanocrystalline with specific morphology and dimension can be obtained by adjusting the pH value of the reaction system, and the nanocrystalline can be used for photocatalytic degradation of organic pollutants, and the method is a rapid, simple and green preparation method of cuprous oxide nanocrystalline.

The invention discloses a preparation method of cerium oxide microspheres, which comprises the following steps: preparing spherical cerous carbonate by a vapor phase diffusion process by using polyelectrolyte as a shape control agent; and carrying out high-heat treatment to obtain the CeO2 microspheres with high specific area. The particle size of the CeO2 microspheres is 300-500nm, and the specific area reaches more than 110 m<2>/g after the CeO2 microspheres are roasted at 500 DEG C. The vapor phase diffusion process is utilized for the first time to prepare the cerium oxide microspheres, and the whole reaction process is carried out at room temperature, so that the invention has the advantages of mild reaction conditions and simple preparation method and is easy to control. The polyelectrolyte is used as the shape control agent for the first time to regulate the shape of the cerous carbonate, thereby regulating the shape of the cerium oxide. Cations and anions of the polyelectrolyte in the water solution can regulate the aggregation of ions and control the shape and size of the cerous carbonate, thereby controlling the shape and size of the cerium oxide. The cerium oxide with high specific area has important applications in catalytic materials of automobile exhaust catalytic purification, petroleum cracking, chemical engineering and the like.

The invention relates to a hexagonal nickel/cobalt oxide oxygen evolution catalyst, and a preparation method and application thereof. Concretely, nickel salts and cobalt salts are used as precursors; oleylamine is used as a coordination agent; in a mixed solvent, a hydrothermal reaction is performed to prepare nickel/cobalt hydroxide nanometer sheets; through the steps of centrifugal washing, drying, roasting and the like, the hexagonal nickel/cobalt oxide nanometer sheets with the diameter being about 150 nm and the thickness being about 10nm are prepared. The nickel/cobalt oxide is applied to the oxygen separation reaction in the water electrolysis hydrogen preparation process under the catalytic basic condition. The prepared nickel/cobalt oxide has the advantages that the specific surface area is large; the appearance is controllable; the preparation process is simple; the conditions are mild; under the condition of external bias pressure exertion, the hexagonal nickel/cobalt oxide oxygen evolution catalyst can be used for water electrolysis cell water electrolysis hydrogen preparation. The prepared nickel/cobalt oxide has good performance when being used as an alkaline solid polymer electrolyte (AEM) water electrolysis cell. The hexagonal nickel/cobalt oxide oxygen evolution catalyst has wide utilization values in RFC (regenerative fuel cells), photoelectrocatalysis and electrolysis hydrogen gas generator devices.

The invention discloses a preparation method of a hydro-thermal coupling spray pyrolysis MnO2/graphene electrode material, belonging to the technical field of electrode materials for energy storage systems. The preparation method comprises the following steps: uniformly mixing graphene oxide (GO) prepared by using a Hummer method with an aqueous solution of bivalent manganese salt and a doped metal ion compound, adding a dispersing agent, an oxidant and a surfactant, and ultrasonically dispersing for a certain period of time; putting the mixed solution into a hydrothermal kettle, adjusting the temperature, and keeping for a certain period of time; filtering and washing a reaction product to obtain a precursor; adding the dispersing agent and the surfactant into the precursor, uniformly stirring for mixing, and adjusting the solid-liquid ratio, inlet temperature and outlet temperature to perform spray pyrolysis in order to obtain a metal ion-doped MnO2/graphene nanometer composite electrode material. According to the nanometer composite electrode material prepared by using the method, components are uniform and the batch stability is high.

The invention provides a method for preparing a three-primary-color up-conversion luminescent material with orthogonal excitation-emission response, and belongs to the technical field of true three-dimensional color display, up-conversion luminescence and nano core-shell material preparation crossing. Specifically, a one-core five-shell structure nanocrystal is prepared through firstly preparing ablue light-emitting core through a full-automatic nano synthesizer, and sequentially inducing epitaxial growth of a first inert isolation layer, a second red light-emitting layer, a third inert isolation layer, a fourth green light-emitting layer and a fifth 808nm exciting light energy absorption layer by using a layer-by-layer wrapping method. Under the excitation of near-infrared light with three different wavelengths of 1560 nm, 808 nm or 980 nm, the five-shell core-shell structure nanocrystal can respond to orthogonal up-conversion luminescence of three primary colors of red, green and blue. The method provides technical support for panchromatic luminescence adjustment, multi-color display, multi-color coding, anti-counterfeiting and the like.

The invention belongs to the technical field of meso-porous materials, and concretely relates to a method for preparing a large-area uniform nano-porous gold film through treating graphene as a template. A gold nanoparticle/graphene composite material film adopted as a raw material can be obtained through a heating reaction in water through a one-step process, the template graphene is removed through adopting two annealing modes comprising direct calcining in air at 600-800DEG C or heating in nitrogen to 600-800DEG C and instant exposure to air, and the nano-porous gold film material having the characteristics of large area, uniformity and different microstructures can be prepared. The poriness of the nano-porous gold film can be adjusted through adjusting the proportions of the two components in the gold nanoparticle/graphene composite material film. Compared with traditional methods for preparing nano-porous gold films through treating colloidal particles as a template or through an alloy removal process, the method provided by the invention has the advantages of simple operation process, mild preparation conditions, nontoxic and environmentally-friendly reagents, and effective control of the morphology of the nano-porous structure, so the method has a wide application prospect.

The invention relates to a method for preparing aluminum oxide nano bars. The method prepares the aluminum oxide nano bars through adopting a biology polysaccharide assisted low-temperature combustion, and comprises the following steps: firstly, aluminium nitrate salt, organic fuel urea, biology polysaccharide and trace mineral supplements are weighted in proportion, the supplements include one or any combination of two of NaNO3, NaC1 and KC1, the de-ionized water is added, the mixture is ground to be a colloid, and the colloid is thermally treated for 0.5 to 1 hour at the temperature of 1050to 1080 DEG C after being ignited at the temperature of 400 to 450 DEG C to obtain an a-Al2O3 nano bar with the diameter of 15 nm to 25 nm, the length of 80 nm to 140 nm, and the slenderness ratio being 5 to 8. The invention has a simple and quick process, and is low in cost; and the prepared aluminum oxide nano bars can be widely applied in the fields such as nano ceramics, composite reinforcements, biomedical materials and the like.

The invention relates to a silver nano-cluster fluorescent nanorod, a preparation method thereof, and an application of the nanorod in white LED. The fluorescent nanorod is formed by self-assembling Ag9 and hydrochloric acid in an aqueous solution. The Ag9 fluorescent nanorod prepared in the invention has outstanding optical properties, still maintains excellent fluorescent performances after being freeze-dried into a powder, can be used to prepare orange red light-emitting LED with a good stability, and can be mixed with a commercial blue phosphor and a commercial green phosphor according toa mass ratio of 10:5:1 to prepare the white light-emitting LED. The luminescent silver cluster can successfully replace the light conversion material of traditional materials in order to provide possibility for producing environmentally-friendly LEDs. The preparation method of the silver nano-cluster fluorescent nanorod of the invention has the advantages of simplicity and low cost; and the prepared LED has an excellent luminous intensity, and meets environmental protection requirements.

The invention discloses an ordered extralarge-hole-pitch alumina film and a preparation method thereof. The alumina film has high hardness and elastic modulus, low reflectivity and obvious photoluminescence performance. The surface of the film is composed of innumerable holes. The bottoms of the holes are distributed in ordered hexagons. According to the ordered extralarge-hole-pitch alumina film and the preparation method thereof, macromolecular organic acid serves as an electrolyte, the electrolyte and an aluminum base are effectively cooled simultaneously, and the aluminum base is stably oxidized under extra-high voltage. The alumina film can serve as an ideal template for preparing various ordered major-cycle nano array structures of metal, polymer and the like, and can also be used for developing three-dimensional channel alumina films of micro and nano composite structures. The major-cycle alumina film is an excellent bioactivator carrier and has wide application prospects in the aspects of biosensors, medicine transport platforms, solar cells and the like.

The invention discloses a hollow-structure nano tungsten oxide wire prepared through in-situ growth of graphene oxide. The hollow-structure nano tungsten oxide wire is prepared by mixing a certain amount of graphene oxide, a precursor compound containing tungsten, absolute ethyl alcohol and deionized water. Compared with a conventional high-pressure reaction kettle preparation method adopting a polytetrafluoroethylene lining, the hollow-structure nano tungsten oxide wire disclosed by the invention has the advantages that the energy consumption is lower, the cost is lower, industrial production investment is low, the product cost is low, and industrial batch production can be conveniently realized.

The invention provides a preparation method of a residual stress sensitive coating modified through graphene. The preparation method comprises the steps that (1) strontium carbonate (CaCO3), aluminum oxide (Al2O3), silicon dioxide (SiO2) and alcohol are weighed and mixed; (2) graphene oxide is dispersed in absolute ethyl alcohol; (3) dilute hydrochloric acid is used for dissolution, and meanwhile, a certain amount of distilled water is added; (4) modification and element regulation and control of Dy3+/Eu3+ are achieved through the graphene, and finally /Dy3+/Eu3+ powder modified through the graphene is obtained through drying in the vacuum atmosphere; (5) CaAl2Si2O8:Eu3+, Dy3+ powder which has the powder particle size of about 1-3 [mu]m and modified through the graphene is obtained through screening; and (6) a graphene co-doped Dy3+/Eu3+ WC-CO powder material with a certain particle size is obtained, and a visual SrAl2O4:Eu3+, Dy3+co-doped WC-CO abrasion-resistant coating is prepared through the thermal spraying technique. By the adoption of the scheme, the particle sizes of spraying materials are uniform, the purity is high, the graphene content in the powder is high, and the preparation method can be used for preparing the residual stress sensitive coating through the thermal spraying technique.

The present invention discloses a method for preparing hollow structure tungsten oxide nano-wires through a graphene oxide in-situ growth method. The method comprises: 1) weighing a certain amount of graphene oxide and a tungsten-containing precursor compound; 2) dispersing in a certain amount of deionized water, and carrying out ultrasonic dispersing; 3) dissolving the weighed tungsten-containing precursor compound in the graphene oxide aqueous solution prepared in the step 2) to obtain graphene oxide and tungsten-containing precursor compound powder, placing into an oven, carrying out thermal insulation for a certain time at a certain temperature to obtain dried mixed powder; and 4) placing the dried graphene oxide and tungsten-containing precursor compound powder obtained in the step 3) in an alumina crucible, and naturally cooling to a room temperature in a H2 atmosphere so as to obtain the hollow structure tungsten oxide nano-wires. Compared to the conventional preparation method using the high-pressure reactor with the polytetrafluoroethylene inner lining, the preparation method of the present invention has advantages of lower energy consumption, lower cost, less investment in industrial production, low product cost, and convenient achievement of the mass production.