3851results about How to "Uniform shape" patented technology

Provided is a chemical wet preparation method for Group 12-16 compound semiconductor nanocrystals. The method includes mixing one or more Group 12 metals or Group 12 precursors with a dispersing agent and a solvent followed by heating to obtain a Group 12 metal precursor solution; dissolving one or more Group 16 elements or Group 16 precursors in a coordinating solvent to obtain a Group 16 element precursor solution; and mixing the Group 12 metal precursors solution and the Group 16 element precursors solution to form a mixture, and then reacting the mixture to grow the semiconductor nanocrystals. The Group 12-16 compound semiconductor nanocrystals are stable and have high quantum efficiency and uniform sizes and shapes.

The present invention provides a system and a method for the production of microparticles and nanoparticles of materials that can be dissolved. The system and method of the present invention provide quicker freezing times, which in turn produces a more uniform distribution of particle sizes, smaller particles, particles with increased porosity and a more intimate mixing of the particle components. The system and method of the present invention also produce particles with greater surface area than conventional methods. One form of the present invention provides a method for the preparation of particles. An effective ingredient is mixed with water, one or more solvents, or a combination thereof, and the resulting mixture is sprayed through an insulating nozzle located at or below the level of a cryogenic liquid. The spray generates frozen particles.

The invention provides homogeneous small spherical particles of low molecular weight organic molecules, said small spherical particles having a uniform shape, a narrow size distribution and average diameter of 0.01-200 μm. The invention further provides methods of preparation and methods of use of the small spherical particles. These small spherical particles are suitable for applications that require delivery of micron-size or nanosized particles with uniform size and good aerodynamic or flow characteristics. Pulmonary, intravenous, and other means of administration are among the delivery routes that may benefit from these small spherical particles.

Shaped, composite bodies are provided. One portion of the shaped bodies comprises an RPR-derived porous inorganic material, preferably a calcium phosphate. Another portion of the composite bodies is a different solid material, preferably metal, glass, ceramic or polymeric. The shaped bodies are especially suitable for orthopaedic and other surgical use.

Composite proppant particles each of which comprises a plurality of microbubbles and a resin binder are disclosed. Also disclosed are a method of using such composite proppant particles to prop fractures in wells formed in underground formations.

A spotting device for manufacturing a DNA microarray and a spotting method using the same are provided. The spotting device for dropping and immobilizing a solution of biomolecules, for example nucleic acids such as probe DNA, mRNA, and peptide nucleic acid (PNA), and proteins on a DNA microarray surface to manufacture a DNA microarray, includes a first microchannel with a tube shape; a supplying unit supplying the solution of biomolecules to the first microchannel; a biomolecule solution droplet forming unit cross-linked to the first microchannel and forming biomolecule solution droplets with a predetermined size by periodically jetting a gas toward the biomolecule solution flowing in the first microchannel; a second microchannel linked to the first microchannel and having a greater diameter than the first microchannel; a cooling unit surrounding at least a part of the second microchannel to freeze the biomolecule solution droplets which pass through the second microchannel; and a spotting unit thawing the frozen biomolecule solution droplets and dropping the thawed biomolecule solution droplets on a surface of the DNA microarray. The spotting device can form spots with uniform shape, minimize an effect of temperature on biomolecules, and easily manipulate biomolecules when manufacturing a DNA microarray.

The invention discloses a preparation method of pellet-type formula granules. The method comprises the following steps: (1) selecting at least one of the traditional Chinese medicinal materials; (2) respectively extracting the medicinal materials selected in step (1) for obtaining extracts, or respectively grinding the medicinal materials, or respectively carrying out partial extraction and partial grinding, thus obtaining pretreated materials; and (3) preparing the pretreated materials obtained in step (2) into pellets, thus obtaining the pellet-type formula granules. According to the preparation method provided by the invention, on the basis of the prior art, the preparation process of the formula granules is innovated, the formula granules are innovated into pellets, the fluidity and moisture absorption resistance are good, the friability is small, the shape is round and uniform as well as regular, the content uniformity is small, and the divided dose is accurate.

The invention belongs to the nano-composite material technology field, in particular to a magnetic inorganic nano-particle/ordered mesoporous silica core-shell microsphere and a preparation method thereof. The invention first utilizes sol-gel chemical synthesis method, coats a layer of amorphous silica on the surface of a plurality of magnetic inorganic nano-particles, then utilizes self-assembly of an organic surfactant as structure-directing agent and inorganic species in the solution, coats a layer of ordered meso-structured silica/surfactant composite material on the surface of the magnetic inorganic nano-particle/ silica composite microsphere, removes the surfactant through solvent extraction, and obtains the ordered mesoporous magnetic inorganic nano-particle/silica core-shell structure composite microsphere material. The composite microsphere has high specific surface area, strong magnetic responsiveness, and wide application prospect in bioseparation and bioabsorption. The invention is simple in method, easy in obtaining raw materials, and suitable for large scale production.

The invention discloses a silver nanodendrite surface enhanced Raman scattering (SERS) substrate, and a preparation method and application thereof, relating to the technical field of nanomaterial science and Raman detection. The SERS active substrate is of silver dendrites which are distributed evenly, and the three-dimensional sizes of dendrites are adjustable. The preparation method of the invention is characterized in that the silver nanodendrites are electrically deposited on commercially available ITO (Indium-doped Tin Oxide) conductive glass by adopting a constant current deposition method and using a silver nitrate solution as electrolyte without adding any other auxiliary. The preparation method of the invention has the advantages of simple, convenient fast (30s) preparation process, low cost, small current and low voltage, and the silver dendrites can be transferred to any substrate (paper, other metal sheets or plastic sheets). The substrate obtained by the method disclosed by the invention has high stability and ordered and controllable structure, and exhibits quite high sensitivity in Raman spectrum detection.

A process for preparing the nanometre tubes of hydrated sodium titanate and titanate series includes such steps as hydrothermal reaction of TiO2 or metatitanic acid to obtain the nanometre tubes of hydrated sodium titanate, mixing them with the solution containing one or two kinds of metal ions to convert them to the nanometre tubes of hydrated titanate or composite hydrated titanates of the saidmetal ions, and thermal dewatering to obtain the nanometre tubes of corresponding titanate or composite titanates. Its advantages are uniform shape, large specific surface area, high thermal stability and regulatable catalytic performance.

A metal nanoparticle colloid solution, metal-polymer nanocomposites, and methods for preparing the same are provided. The metal nanoparticle colloid solution and the metal-polymer nanocomposites can be prepared with a variety of polymeric stabilizers and have uniform particle diameter and shape. The metal nanoparticle colloid solution and the metal-polymer nanocomposites have wide applications, for example, as an antibacterial agent, a sterilizer, a conductive adhesiv, conductive ink or an electromagnetic wave shielder for an image display.

The invention discloses a method for synthesis of a cobalt nanoparticle and bamboo-like nitrogen doped carbon nanotube composite material. The method includes: dissolving a soluble cobalt salt and an amine polymer in a hydrophilic reagent according to a mole ratio of 1:(2-200), performing evaporation at 60DEG C, conducting grinding after cooling, performing calcination at 400-1400DEG C under nitrogen atmosphere, then treating the sample with acid, and carrying out washing, centrifugation and drying so as to obtain the cobalt nanoparticle and bamboo-like nitrogen doped carbon nanotube composite material. The obtained cobalt nanoparticles have small particle size and are employed to coat the head of a carbon nanotube evenly so as to combine tightly with the carbon nanotube. The composite material has application prospects in fuel cell anode materials, lithium ion battery cathode materials and the like. The method designed by the invention has the advantages of easily available raw materials, simple process and no pollution, short preparation period, mild reaction conditions, low cost, and mass synthesis capability, etc.

The invention relates to a controllable synthesis method for a nitrogen and phosphorus co-doped graphitized carbon ball with a hollow structure. The method comprises the following preparation steps: (1) a carbon source, soluble metal salt and a catalyst are dissolved in a solvent according to a molar ratio, the mixture is transferred to a hydrothermal reaction kettle for hydrothermal synthesis after stirred to be dissolved completely, and an obtained precipitate is cleaned, filtered and dried to obtain a primary product; (2) the obtained primary product is subjected to high-temperature reduction under the protection of gas in a high-temperature reaction furnace; and (3) the product obtained by high-temperature reduction is placed in an acid solution to be soaked, and then cleaned, filtered and dried to obtain the nitrogen and phosphorus co-doped graphitized carbon ball with the hollow structure. The nitrogen and phosphorus co-doped graphitized carbon ball with the hollow structure prepared with the method has the advantages that the appearance is uniform, a carbon shell has a cellular structure, the interior of the carbon ball has a mesoporous carbon support structure, the graphitization degree is good, and the like; and the carbon ball can be used in various fields of efficient catalytic conversion, energy storage and conversion, medicine release and control, substance adsorption and separation and the like. A template-free hydrothermal synthesis technique is simple and controllable, and can be used for mass production.

An electronic sign having a formed metal cabinet where precise and close tolerance formed planar panels and formed channels are fastened together only by rivets, nut inserts, adhesive coated tapes, or the combination thereof for rapid assembly thereof.

Microparticles and a method for their production is described. The process of the present invention provides a simple, quick, and efficient one-pot process for the production of microparticles containing a non-water soluble active agent. The microparticles are preferably used for pharmaceutical applications and comprise at least 80 wt % microspheres.

The invention discloses a slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content, a preparation method and an application thereof, and belongs to the technical field of molecular sieves. Tetraethylammonium hydroxide is used as a template, the slice-shaped nanometer SAPO-34 molecular sieve with relatively low silicon content is synthesized by using the traditional hydrothermal method or a solvothermal synthesis method. The synthesized nanometer SAPO-34 sample is a slice-shaped feature, of which the average crystal granularity size is 50-250nm and the thickness is 50-100nm. The synthetic method is simple and efficient; the solvent consumption is low; the yield of the synthesized nanometer SAPO-34 sample is extremely high and can be up to 85-90 percent; the synthesized nanometer SAPO-34 sample is high in low carbon olefin selectivity during reaction of methanol to olefin (MTO), particularly, the total yield of ethylene and propylene can be up to more than 83 percent, and the molecular sieve is very suitable for industrial amplification application.

A display device includes an array of light emitting cells. Each of the light emitting cells includes a first electrode, a second electrode, and an organic light emitting layer located between the first electrode and the second electrode. Banks are above the first electrode that partition the organic light emitting layer to define each of the light emitting cells. The light emitting cells include a peripheral light emitting cell that is located in a peripheral region of the array. The banks include first and second banks that each border the peripheral light emitting cell. The first bank is closer to a periphery of the array than the second bank. An inclination angle of an innermost sidewall of the first bank that is adjacent the peripheral light emitting cell is greater than an inclination angle of an outermost sidewall of the second bank that is adjacent the peripheral light emitting cell.

This invention discloses a preparation method for spinel lithium titanate nm pipes/nm lines used in Li batteries and capacitors, which applies cheap industrial TiO2 as the raw material and supersonic chemical method to prepare said nm pipes/lines then takes them as the raw materials to be mixed with a certain quantity of soluble Li salt solution to be baked in air and by low-temperature hydrothermal ion exchange method to manufacture spinel lithium titanate nm pipes/lines with uniform shape, uniform diameter and even larger major diameter ratio and big ratio surface area.

A plurality of container assemblies are provided. Each container assembly has substantially identical external dimensions. However, the internal volumes of certain container assemblies differ from the internal volumes of other container assemblies. The container assemblies are configured in accordance with the required volume of material to be collected or maintained in the respective container assemblies and to enable uniform head spaces despite the different volumes of materials in the respective container assemblies. Each container assembly may have an inner container and an outer container. The inner and outer containers may be assembled together or formed integrally by molding.

The invention discloses a dark tea processing method. The dark tea processing method is characterized by comprising the following steps of: (1) picking fresh leaves; (2) withering the fresh leaves; (3) then removing water; (4) then twisting for 20-25 minutes; (5) heating tea bases to increase temperature to 50-60 DEG C, then blanking the tea bases and slightly spreading, and reducing the temperature of the tea bases to 35-40 DEG C, wherein the water content of the tea bases is 60%-65%; (6) lining the tea bases by using reed leaves, cladding, and then covering by using a wet cloth for pile fermentation; and (7) drying by using a drying machine for the first time, drying by using a roasting machine for the second time, drying by using the drying machine for the third time, and spreading for airing after drying every time. The dark tea processed by the dark tea processing method disclosed by the invention has the advantages of uniform and strip-shaped outline, jet-black and lubricating color and luster, golden and bright soup color similar to amber, mellow and sweet flavor, rich fragrance, fruit honey aroma, yellow brown and uniform leaf base, stable quality and drinking safety and is a high-quality loose dark tea with unique style.