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400results about How to "Narrow size distribution" patented technology

Monodisperse core/shell and other complex structured nanocrystals and methods of preparing the same

The present invention provides new compositions containing naearly monodisperse colloidal core / shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nanocrystals. This invention also provides new synthetic methods for preparing these nanocrystals, and new devices comprising these compositions. In addition to core / shell semiconductor nanocrystals, this patent application also provides complex semiconductor nanostructures, quantum shells, quantum wells, doped nanocrystals, and other multiple-shelled semiconductor nanocrystals.
Owner:THE BOARD OF TRUSTEES OF THE UNIV OF ARKANSAS

Porous microparticles with solid cores

The present invention relates to microparticles, particularly spherical silica microparticles, which may be useful in liquid chromatography. Specifically, the microparticles include a solid core and an outer porous shell surrounding and irreversibly joined to the core. The shell is composed of a plurality of colloidal nanoparticles, which are applied using an electrostatic multi-multilayering method. The resulting microparticles have a small particle diameter, such as about 1 μm to 3.5 μm, a high particle density, such as about 1.2 g / cc to 1.9 g / cc, and a high surface area, such as about 50 m2 / g to 165 m2 / g. These microparticles can be used to form packed beds and liquid chromatographic columns, which are more efficient and rugged than conventional liquid chromatographic columns.
Owner:ADVANCED MATERIALS TECHNOLOGIES

Controllable filler prefloculation using a dual polymer system

A method of preparing a stable dispersion of flocculated filler particles for use in papermaking processes comprises sequential addition of high and low molecular weight flocculating agents to an aqueous dispersion of filler particles followed by shearing of the resultant filler flocs to the desired particle size resulting in shear resistant filler flocs with a defined and controllable size distribution.
Owner:ECOLAB USA INC

Microfluidic technology for one-step continuous preparation of calcium alginate microgel

The invention relates to a microflow droplet technology-based method for one-step continuous preparation of multi-chamber calcium alginate microgel for immobilization of bioactive substances. The method realizes high-throughput continuous production of a microgel material. The method comprises forming a parallel and stable flow field through different hydrogel prepolymer solutions in a microfluidic channel, pouring the hydrogel prepolymer solutions for forming different chambers of the microgel into a microfluidic chip to form water phase solutions of multiple phase parallel fluids, mixing thewater phase solutions and an immiscible fluid (oil phase) through a T-shaped channel or a fluid focusing design to obtain water-in-oil emulsion drops and then alginic acid in the drops is linked immediately so that multi-chamber microgel is prepared, and cleaning the emulsion drops on the microfluidic chip so that the microgel is fast conveyed into a water phase. The method realizes one-step preparation of the calcium alginate microgel immobilized with bioactive substances and is suitable for industrial application.
Owner:SHENZHEN HUA NOVA BIOTECH LTD

Process and a device for atomizing liquids

The liquid to be atomized is uniformly sprayed on the inner surface of a hollow rotating cylinder, for example by means of one- or two-fluid-nozzles and is thus distributed on bores provided in the cylinder wall. The rotation of the cylinder causes the liquid to flow outwards through the bores. Droplets are generated when the liquid flows out of the bores by laminary decomposition of the jet. The flow rate in each bore lies in the range 1.0<+E,dot V+EE B (a3 rho 5/ sigma 5)0.25<16 to prevent the droplets from becoming too large and to satisfy the condition of an adequate flow laminarity, i.e. for the value of the Reynolds number for the continuous liquid flow in the boress not to exceed Re delta 400. +E,dot V+EE B represents the flow rate of the liquid in each bore, a represents the centrifugal acceleration at the outer surface of the cylinder, rho represents the density of the liquid and delta indicates the surface tension of the liquid. The large number N>200 of bores having the diameter DB in the cylinder wall causes the flow rate of liquid through each bore to be relatively low, so that a continuous laminary flow in each bore is ensured even at low viscosities and technically useful total flow rates. Preferably cylindrical bores with a minimum length at least three times larger than the bore diameter are provided in the cylinder wall, with a narrow spacing in the range defined by 1.1<t/DB<5, so that a number of bores as large as possible may be arranged in the wall of the cylinder.
Owner:NIRO

Method for preparing black zirconia ceramics at low temperature

The invention relates to a method for preparing black zirconia ceramics at the low temperature and belongs to the technical field of the preparation of high-temperature structural material. The method respectively uses a homogeneous precipitation method for synthesizing a nanometer coloring agent, and a coprecipitation method for synthesizing nanometer zirconia powder, and adopts Fe-Co-Ni-Mn as a coloring agent. The zirconia powder is not added with any sintering additive, only added with small amount of coloring agent and sintered at the temperature of 1150-1350 DEG C, thus obtaining the black zirconia ceramics with excellent performance and bright color. As the homogeneous precipitation method is adopted for synthesizing coloring agent powder, the monodisperse nanometer particles with uniform powder granules, narrow size distribution and high purity are obtained so that the coloring agent easily colors the particles. As the coprecipitation method is used for synthesizing zirconia powder, nanometer particles with small granularity, big superficial area and high activity are obtained, and can reduce the temperature of the solid-phase reaction, greatly reduce the sintering temperature and solve the problem that the black coloring agent oxide decomposes and volatiles at the high temperature. Simultaneously the method adopts the Fe-Co-Ni-Mn as the coloring agent, thus avoiding the poisonous function of Cr on the human body.
Owner:TSINGHUA UNIV

Iron-based catalyst for low-carbon olefin production through CO2 hydrogenation, and preparation and applications thereof

The present invention provides an iron-based catalyst for low-carbon olefin production through CO2 hydrogenation, wherein the main active component of the catalyst is Fe3O4, the auxiliary agent is added or is not added, and is an oxide, the content of the auxiliary agent accounts for 0-30% of the total mass of the catalyst, and the auxiliary agent is one or more than two selected from the oxide of Si, Al, Mn, K, Cu, Na, Zr, V, Zn and Ce. The present invention further provides a preparation method and applications of the catalyst. According to the present invention, the catalyst has the following beneficial effects that 1) the particles have characteristics of regular spherical shape, uniform spatial distribution, and narrow size distribution; 2) the raw materials are inexpensive and easy to obtain, and the preparation method has characteristics of simpleness and low cost, and is suitable for industrial production; 3) the catalyst has characteristics of high mechanical strength, good wear resistance and compression resistance, and is suitable for the fixed bed, the fluidized bed and the slurry bed; 4) the CO2 hydrogenation activity and the low-carbon olefin selectivity are high, the single-pass conversion rate can achieve more than 40%, the methane selectivity in the hydrocarbon product is lower than 15%, the low-carbon olefin selectivity is higher than 40%, the alkene / alkane ratio (O / P) is 2-12, and the yield of the low-carbon olefin can achieve 10-60 g / m<3> (CO2+H2).
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

Iron-based catalyst for preparation of low carbon olefin from synthetic gas, and preparation method and application thereof

The invention provides an iron-based catalyst for preparation of low carbon olefin from synthetic gas. The catalyst contains Fe3O4 as a main active component, and also contains one or two or above assistant M for modification, and M is selected from Si, Al, Mn, K, Cu, Na, Zr, V and Zn. The content of oxide of the assistant in the catalyst is 0-30wt%. The catalyst has the following advantages: 1, particles of the catalyst have regular spherical morphology, uniform space distribution, narrow dimension distribution, and average particle size of 30nm; 2, the catalyst has the characteristics of cheap and easily available raw materials, simple preparation method, low cost, and suitableness for industrial production; 3, the catalyst has good mechanical strength, wear resistance and compression resistance, and is suitable for being applied in fixed beds, fluidized beds and slurry beds; and 4, the catalyst has high Fischer-Tropsch synthesis activity and high low-carbon olefin selectivity, the single-pass conversion rate can reach above 95%, the methane selectivity is lower than 15%, the olefin / paraffin ratio (O / P) is 2-6, and the low-carbon olefin yield can reach 40-100g / m<3>(CO+H2).
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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