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9223results about How to "Uniform particle size" patented technology

Nano Anticancer Micelles of Vinca Alkaloids Entrapped in Polyethylene Glycolylated Phospholipids

The present invention provides a nano-micellar preparation containing vinca alkaloids antitumor agent for intravenous injection, which cincludes a therapeutically effective amount of vinca alkaloids antitumor agent (vinblastine, vincristine, vindesine and vinorelbine), a phosphatide derivatized with polyethylene glycol, together with pharmaceutically acceptable adjuvants. The preparation is prepared by encapsulating the medicament with a nano-micelle to obtain the nano-micellar preparation containing vinca alkaloids antitumor agent for injection. The vinca alkaloids antitumor agent and the phosphatide derivatized with polyethylene glycol form a nano-micelle with a highly uniform particle size. In the micelle, the hydrophobic core of encapsulated medicament is surrounded by polyethylene glycol molecules to form a hydrophilic protective layer, so that the medicament is prevented from contacting with the enzymes and other protein molecules in blood and being recognized and phagocytozed by reticuloendothelial system in body, and the circulation time in vivo of the micelle is prolonged.

Method for forming electrode for flat panel display

The present invention provides a method for forming an electrode of a flat panel display device using ink for ink jet printing and an ink jet printer. The ink for ink jet printing is prepared by a method comprising the first step of contacting the vapor of a metal with the vapor of the first solvent, according to the vapor phase-evaporation technique, to thus give a dispersion of metal ultrafine particles; the second step of adding a low molecular weight polar solvent as the second solvent to the dispersion prepared in the first step to thus precipitate the metal ultrafine particles and removing the first solvent; and the third step of adding the third solvent to the precipitates thus prepared to carry out the solvent substitution and to give a dispersion of independently dispersed metal ultrafine particles, and prepared by adding a dispersant in or during the foregoing first and / or third steps, and the ink for ink jet printing consists of a dispersion excellent in ink characteristic properties. In the dispersion, metal ultrafine particles having a particle size of not more than 100 nm are independently and uniformly dispersed. The electrodes of FPD devices are formed using this ink for ink jet printing.

Material for rapid three dimensional printing forming and preparation method thereof

The invention discloses a material for rapid three dimensional printing forming and a preparation method thereof. The material comprises a modifying powder material A and bonding agent B, wherein preparation method of the modifying powder material A comprises the following steps: adding powder material and a first solvent into a ball mill or grinding mill, and milling to obtain a pretreated powder material; adding surfactant, lubricant and organic resin into a second solvent in sequence, and stirring and dispersing for 2-3 hours to obtain modifying solution; mixing the pretreated powder material and the modifying solution, adding into the grinding mill, mixing and milling at normal temperature, drying, grinding, and pulverizing to obtain the modifying powder material A. When in use, one weight part of the modifying powder material A and 0.01-0.07 weight parts of the bonding agent B are blended. The material provided by the invention is used as the raw material for a rapid three dimensional printing forming machine, and can be used for effective rapid forming on different types of three dimensional printing machines.

Polymer nanomicrosphere product with uniform and controllable size and preparation method thereof

InactiveCN102417552AGood batch repeatabilityHigh mechanical strengthPolymer scienceMicrosphere
The invention relates to a polymer nanomicrosphere product with uniform and controllable size and a preparation method thereof. The preparation method comprises the following steps: preparing polymerizable olefine monomers, an initiator, assistants and the like into an oil phase, and preparing water, a stabilizer, an emulsifier and the like into a water phase; and mixing the oil phase and water phase into an O / W pre-emulsion, quickly passing the pre-emulsion through a uniform-pore-size microporous membrane under pressure to form a uniform-particle-size O / W emulsion, and polymerizing and curing emulsion droplets in the emulsion into the uniform-particle-size polymer nanomicrospheres. The average particle size of the microspheres can be controlled within the range of tens of nanometers to 50 micrometers, and the particle size distribution coefficient C.V. is smaller than 20%. The method has the advantages of simple steps, favorable batch repetitiveness, uniform and controllable particle size, no need of subsequent screening and the like, is easy to control, can easily implement large-scale production, and therefore, has the characteristics of fewer emissions and low preparation cost.

Method for manufacturing metal sulfide nanocrystals using thiol compound as sulfur precursor

Disclosed herein is a method for manufacturing metal sulfide nanocrystals using a thiol compound as a sulfur precursor. The method comprises reacting the thiol compound and a metal precursor in a solvent to grow metal sulfide crystals to the nanometer-scale level. Further disclosed is a method for manufacturing metal sulfide nanocrystals with a core-shell structure by reacting a metal precursor and a thiol compound in a solvent to grow a metal sulfide layer on the surface of a core. The metal sulfide nanocrystals prepared by these methods can have a uniform particle size at the nanometer-scale level, selective and desired crystal structures, and various shapes.

Method for preparing nanosilver powder in batches

The invention provides a method for preparing nanosilver powder in batches, belonging to the field of nano-material preparation. Nanosilver particles are synthetized in two steps, at first, a low-concentration reducing agent solution is slowly added into a solution mixed with silver salt, a protective agent, and a pH conditioning agent drop by drop, and then a high-concentration reducing agent solution is rapidly added drop by drop to obtain a nanosilver mixed solution; impurities in the nanosilver mixed solution are removed through a membrane separation device to obtain a nanosilver dispersion liquid; and at the end, absolute ethyl alcohol and a high-molecular dispersant are added into the nanosilver dispersion liquid, and spray drying is carried out by a spray drying device to obtain nanosilver powder in a certain particle size. The particle size of the prepared nanosilver powder is controllable, the batches are stable, the problems of non-uniform particle size during the synthesis of nanosilver, nanosilver separation, and agglomeration and acaking during powder preparation are solved, the preparation process and the operation are simple, and industrial and batches production is realized.

Graphene/mesoporous titanium dioxide visible light catalyst and preparation method

The invention relates to a graphene / mesoporous titanium dioxide visible light catalyst and a preparation method, and belongs to the technical fields of nanometer composite materials and photocatalysis. The method comprises the following steps of: adding a graphene oxide into glacial acetic acid, and performing ultrasonic dispersion to obtain dispersion liquid of the graphene oxide; and adding a titanium source into the dispersion liquid of the graphene oxide, and preparing the graphene / mesoporous titanium dioxide nanometer composite visible light catalyst in a one-step in-situ form by a hydrothermal method. The graphene / mesoporous titanium dioxide visible light catalyst has the advantages of readily available raw materials and low cost, the preparation process is simple and convenient, and titanium dioxide in the obtained nanometer composite material has a nanometer poroid structure, a regular size and a special appearance; and titanium dioxide nanometer granules can be distributed onthe surface of graphene and are high in dispersity. Photocatalytic degradation experiments indicate that the graphene / mesoporous titanium dioxide nanometer composite light catalyst has a good photocatalytic degradation effect on rhodamine B under the irradiation of visible light, and is an ideal nanometer composite visible light catalyst.

Method of controlling and refining final grain size in supersolvus heat treated nickel-base superalloys

InactiveUS20090000706A1High strain rateAvoiding necessity to forge superplasticallyHigh carbonHeat treated
A method of forming a component from a gamma prime precipitation-strengthened nickel-base superalloy. The method entails formulating the superalloy to have a sufficiently high carbon content and forging the superalloy at sufficiently high local strain rates so that, following a supersolvus heat treatment, the component is characterized by a fine and substantially uniform grain size distribution, preferably finer than ASTM 7 and more preferably in a range of about ASTM 8 to 10.

Method for preparing nano iron phosphate

The invention relates to a method for preparing nano iron phosphate, belonging to the technical field of the preparation of lithium ion battery cathode materials. The method is characterized by comprising the following steps: inputting an alkaline aqueous solution and a mixed solution formed by one of phosphoric acid or a soluble phosphate solution, one of a water-soluble ferrous salt solution and an oxidant or a ferric salt solution and a water-soluble dispersing agent into a rotating packed bed layer by a metering pump at a certain feeding speed; regulating the rotating speed of the rotating packed bed and controlling the pH value of the reaction system by an alkaline solution; discharging nano iron phosphate particles generated by reaction crystallization from a discharge hole of the rotating packed bed along with the mixed solution; and filtering, washing and drying the nano iron phosphate particles to obtain nano iron phosphate (FePO4.2H2O) powder. The method is simple and has easy operation and high efficiency, and the prepared iron phosphate reaches the nano grade, has uniform particle size and narrow distribution range and is suitable for industrialized production. The nano iron phosphate is a good precursor material for preparing lithium iron phosphate which is used as a cathode material of high-power type lithium ion batteries.

Method for preparing spherical aluminum-doped nickel lithium carbonate for lithium ion battery positive electrode material

ActiveCN102074679AMorphology and particle size distribution controllableGood liquidityCell electrodesLoop stabilityLithium electrode
The invention relates to a method for preparing spherical aluminum-doped nickel lithium carbonate for a lithium ion battery positive electrode material by combining liquid phase oxidation and crystallization controlling. Through controlling of the preparation technique, firstly synthesizing a spherical hydroxyl oxygenized nickel cobalt aluminum precursor with high density, and then calcining at the temperature of 500-800 DEG C for 10-24 hours in a flow oxygen gas atmosphere after mixing the precursor with a lithium source, thus acquire the spherical aluminum-doped nickel lithium carbonate with high density. The synthesized aluminum-doped nickel lithium carbonate is in a single spherical shape, has good stacking density, and can be used for improving the volume ratio capacity of a battery.The aluminum-doped nickel lithium carbonate prepared by the method in the invention has the advantages of high specific capacity and good loop stability. The method provided by the invention has the advantages of simple technique, low cost, less pollution, good product performance and suitability for industrialized production.

Process for recovering polyethylene glycol and silicon carbide in waste mortar from silicon wafer wire cutting

InactiveCN101474511AFacilitates flocculation and filtrationAvoid pollutionPlastic recyclingFiltration circuitsFiberHollow fibre
The invention relates to the field of silicon wafer wire-electrode cutting and discloses a method for recycling carborundum and cutting polyethyleneglycol in waste mortar by silicon wafer wire-electrode cutting. In monocrystalline silicon piece processing technique, a viscosity reduction agent is firstly added before waste mortar linear cutting, and then a suspending liquid part and a solid particles part are obtained by the solid-liquid separation; The suspending liquid part is added with a filter aid, then filter pressing with a plate frame, micro porous filtration, hyper filtration with hollow fiber and ion exchange are carried out sequentially, and finally, the suspending liquid is distillated in vacuum and polyethyleneglycol is recycled. Alkali reaction cleaning, water scrubber washing, centrifugalization, acid reaction cleaning, the second water scrubber washing, the second centrifugalization, the second acid reaction cleaning, drying and drying classification are carried out on the solid particles in sequence, and finally, recyclable silicon carbide particles are obtained.
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