Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
1339results about How to "Particle size controllable" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Olefinic polymerization catalyst carried by carrier of sphere MgCl-alcohol-organic complexing agent and preparation method
The invention discloses an defin polymerization catalyst loaded on spherical MgCl2-alcohol-organic complexing agent camier and its preparation method. Said method includes the following steps: under the protection of argon gas using TiCl4 and MgCl2-alcohol-organic complexing agent spherical carrier, stirring them at -30 deg.c-0 deg.C in reaction still and making them produce reaction for 10-30 min., heating to 60 deg.C-80 deg.C, adding internal doner residues, and more heating to 90 deg.C-140 deg.C, thermostatically stirring and making reaction for 1-3 hr., then removing liquid phase, adding TiCl4 to make treatment once, and removing liquod phase, washing by using solvent, removing solvent, vacuum drying so as to obtain spherical catalyst. Said spherical catalyst uses spherical MgCl2-alcohol-organic complexing agent as carrier, and the preparation process of said catalyst is retatively simple, and small in environmental pollution. Said invention can effectively regulate grain size of catalyst and its distribution by controlling grain size of spherical MgCl2-alcohol-organic copmlexing agent carrier and its distribution, after the olefin is catalyzed and polymerized, the spherical polyolefin can be obained.
Owner:ZHEJIANG UNIV
Titanium silicalite TS-1 catalyst preparation method
InactiveCN101767036AHigh activityLow costMolecular sieve catalystsCatalyst activation/preparationMolecular sieveMicrometer
The invention discloses a titanium silicalite TS-1 catalyst preparation method. Cheap inorganic Titanium silicalite is used as raw material, low quantity of tetrapropylammonium hydroxide or tetrapropylammonium bromide is adopted as template agent, and inorganic alkali such as ammonia water is used as alkali source so that the raw materials for preparation have low price and the production cost isgreatly reduced. The precursor preparation process is simple and easy to control, seed crystal is added to reduce the crystallization time and the repeatability is good. As secondary crystallization is adopted, the non-framework titanium is further reduced, and the acid site of the molecular sieve is reduced, the grain size is controllable within certain range, the molecular sieve channel becomessmoother to facilitate direct membrane separation of micrometer crystalline grains, and the obtained Titanium silicalite TS-1 catalyst has large grains, high activity, stable catalytic performance and broad industrial application prospect.
Owner:XIANGTAN UNIV
Continuous aluminium oxide base ceramic fibre preparation method
ActiveCN101381225AAvoid instabilityAvoid cracking tendenciesInorganic material artificial filamentsFiberSilicon dioxide
The invention provides a method for preparing a continuous alumina-based ceramic fiber, which relates to an alumina-based ceramic fiber, in particular to a method for preparing a continuous alumina-based ceramic fiber which takes alumina as a main component and adds a second component as a crystalling phase inhibitor. The invention provides a method for preparing the continuous alumina-based ceramic fiber, which is simple in technique and low in cost. The method comprises the steps: preparing alumina sol; preparing silicon dioxide sol; mixing the alumina sol and the silicon dioxide sol to obtain biphase sol, and adding a spinning addition agent into the biphase sol; condensing the biphase sol added with the addition agent and spinning by a dry method to obtain the gel fiber; pyrolyzing the gel fiber to obtain the ceramic fiber; and sintering the ceramic fiber to obtain the continuous alumina-based ceramic fiber.
Owner:FUJIAN ESTABLISHED YATE TAO CO LTD
Liquid-solid mixed lipid nano-slow release system for cosmetic and preparation method thereof
InactiveCN102793628AParticle size controllablePlay its due roleCosmetic preparationsBody powdersWater bathsLipid formation
The present invention relates to a liquid-solid mixed lipid nano-slow release system for cosmetics and a preparation method thereof. The release system is composed of nanoparticles constituted by liquid lipid and solid lipid and at least one active ingredient coated in the nanoparticles. The preparation method includes: (1) dispersing a mixing carrier of the solid lipid and the liquid lipid to an organic solvent, adding the active ingredient, and heating in a water bath to dissolve the solid lipid to get an organic phase solution; (2) formulating polyvinyl alcohol into an aqueous phase solution, and adjusting the pH to be acidic to get an aqueous phase solution; and (3) adding the organic phase solution to the aqueous phase solution under the conditions of mechanical agitation with stirring to get a mixed lipid dispersion liquid which is then centrifuged and separated to obtain the nano-slow release system. The nano-slow release system is simple in preparation method and high in stability. The dimensions of the particles are in nanoscale, and the particle size is controllable. The entrapment efficiency of the liquid-solid mixed lipid nanoparticles has been greatly improved than simple solid nanoparticles.
Owner:DONGHUA UNIV
Method for preparing hydrophobic nano-silica with controllable grain diameter
InactiveCN101880478AGood dispersionHydrophobicPigment treatment with organosilicon compoundsSal ammoniacReaction temperature
The invention discloses a method for preparing hydrophobic nano-silica with a controllable grain diameter. The method comprises the following steps of: adding ammonia water and water into absolute ethanol and stirring the mixture for 0.5 to 1 hour at the temperature of between 20 and 70 DEG C; under an alkali condition, performing hydrolytic polycondensation to obtain nano-silica by using the absolute ethanol as solvent and tetraethoxysilane as a raw material; and preparing the hydrophobic nano-silica with the grain diameter in the range of between 20 and 500 nm by using a silane coupling agent as a hydrophobic modifier, wherein the using amount of ammonia water is 40 to 100 percent of the weight of the tetraethoxysilane; the using amount of the absolute ethanol is 12 to 25 times the weight of the tetraethoxysilane; and the using amount of the water is 30 to 150 percent of the weight of the tetraethoxysilane. The preparation method has the advantages of simpleness, easy operation and mild reaction condition. The hydrophobic nano-silica with the controllable grain diameter can be prepared by adjusting proportion and technological parameters of the materials.
Owner:SOUTH CHINA UNIV OF TECH
Method for preparing calcium carbonate with actual forms
InactiveCN1429772AEasy to shapeThe shape is obviously better than that of the prior art productsCalcium/strontium/barium carbonatesCalcium hydroxideField conditions
A process for preparing calcium carbonate with actual forms (such as spindle, petal, needle, flake, ball fibre, etc.) features that in the supergravity field condition of rotating bed and under the existance of crystal form controlling agent and crystal seeds, the suspension of calcium hydroxide and CO2-contained raw gas take part in carbonifying reaction. Its advantage is controllable granularity and form.
Owner:NANOMATERIALS TECH PTE +1
Silicon/carbon composite microsphere negative electrode material as well as preparation method and application for same
ActiveCN103311522AStable structureImprove charge and discharge cycle lifeCell electrodesSolventCarbon black
The invention relates to a silicon / carbon composite microsphere negative electrode material as well as a preparation method and an application for the same. The silicon / carbon composite microsphere negative electrode material is silicon / carbon composite microspheres internally provided with pore structures; and each microsphere comprises a matrix material of hard carbon, and an active material of silicon powder. The preparation method for the silicon / carbon composite microsphere negative electrode material comprises the following steps of: uniformly mixing silicon powder, soft carbon, carbon black, a soluble carbon-containing organic adhesive and a solvent with formula amounts to obtain a slurry; and performing spray-drying and carbonization on the slurry to obtain the silicon / carbon composite microsphere negative electrode material. The silicon / carbon composite microsphere negative electrode material provided by the invention has the advantages of being high in tap density, high in reversible capacity, good in cyclicity, good in rate capability, safe and reliable, and high in first-week coulombic efficiency; the preparation method provided by the invention is simple in process, environment-friendly, low in energy consumption and cost, and easy to realize large-scale production.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
Preparation method for starch nanospheres
InactiveCN104785179AEasy to operateEasy to controlMicroballoon preparationMicrocapsule preparationFood additiveMicrosphere
The invention discloses a preparation method for starch nanospheres. The method comprises the following steps: (1) dissolving amylase in an alkaline solution, and stirring to obtain suspension; (2) completely freezing the suspension obtained in the step (1); (3) thawing a product obtained in the step (2), and obtaining a starch solution; (4) dialyzing the starch solution obtained in the step (3), and obtaining starch dispersion liquid; (5) filtering the starch dispersion liquid obtained in the step (4), and drying to obtain the starch nanospheres. The preparation method is energy-saving, environment-friendly and simple to operate, and a process is easy to control; the preparation method only adopts a general chemical reagent and simple experimental equipment, can realize large-scale production and is easy for industrialized promotion; the starch nanospheres prepared with the method are high in purity, and the starch structure is not changed; the starch nanospheres prepared with the method are controllable in particle size and uniform in particle size distribution, can be stably dispersed in water, and can be used for biomedical carriers and food additives.
Owner:INST OF CHEM CHINESE ACAD OF SCI
Transparent super-hydrophobicity wood coating and preparation method thereof
InactiveCN103756541AParticle size controllableHydrophobic hasPolyurea/polyurethane coatingsPolyester coatingsOctadecyltrichlorosilanePolymer science
The invention discloses a transparent super-hydrophobicity wood coating which comprises the following components in parts by weight: 20-50 parts of water dispersive polyurethane resin or water dispersive alkyd resin, 4.5-25 parts of nano silica sol, 3-16 parts of nano cellulose gel, 0.1-1 part of octadecyl trichlorosilane or tetrahydroperfluorodecyltrichlorosilane or stearic acid and 0-45 parts of nano talc powder or nano calcium carbonate. A preparation method of the transparent super-hydrophobicity wood coating comprises the following steps: adding matrix resin and filler into a stirring kettle, and stirring uniformly to obtain slurry; grinding the slurry with a sand mill; adding a low-surface energy substance and supported nano silica sol; performing ultrasonic sufficient mixing for 30 minutes to obtain the transparent super-hydrophobicity coating. The transparent super-hydrophobicity wood coating disclosed by the invention has the advantages of low cost, controllable process, adjustable size and good applicability and is suitable for a preparation method of large-area preparation of transparent super-hydrophobicity surface; the prepared super-hydrophobicity film has good self-cleaning property, antifouling property, hydrophobic property, oleophobic property and the like.
Owner:GUANGDONG YIHUA TIMBER IND +1
Mono-dispersed spherical mesoporous silicon dioxide nanomaterial and preparation method thereof
InactiveCN102249248AGood monodispersityParticle size controllableSilicaNanotechnologyTetraethyl orthosilicateNanoparticle
The invention relates to a mono-dispersed spherical mesoporous silicon dioxide nanomaterial, which is characterized in that: the nanomaterial has a spherical structure of which the particle diameter is 80-200 nanometers; the relative standard deviation of the particle diameter is not more than 8 percent; the specific surface area of the material is 1,057-1,379 m<2> / g; the pore volume is 0.74-0.89 cm<3> / g; the mesoporous pore diameter is 2.4-2.6 nanometers; and the nanometer material has a pore canal structure formed radially from the center of a sphere to an outer surface. The mono-dispersed spherical mesoporous silicon dioxide nanomaterial is prepared by hydrolyzing and condensing by taking a cationic surfactant as a template, tetraethyl orthosilicate as a silicon source and alcohol as a cosolvent under alkaline condition. The method has the advantages of simple equipment, easiness of operation, short preparation period, high repeatability, high yield, low cost and environment friendliness. The prepared silicon dioxide material is of spherical nanoparticles which have controllable particle diameters, uniform particle diameter distribution, high mono-dispersity, narrow pore diameter distribution and ordered mesoporous pore canal structures.
Owner:OCEAN UNIV OF CHINA
Graphene aerogel microspheres and preparation method and application thereof
ActiveCN105195067AParticle size controllableLarge specific surface areaIon-exchange process apparatusWater cleaningFreeze-dryingMicrosphere
The invention discloses graphene aerogel microspheres and a preparation method and application thereof. The preparation method is characterized in that 1, graphite oxide is prepared; 2, graphene oxide aqueous dispersion is prepared; 3, the graphene oxide aqueous dispersion is atomized through a spraying method into graphene oxide liquid drop microspheres, and meanwhile the microspheres are collected through receiving liquid in a cooling bath; 4, the receiving liquid is filtered to obtain graphene oxide ice microspheres, and then freeze drying is performed on the microspheres to obtain graphene oxide aerogel microspheres; 5, the graphene oxide aerogel microspheres are subjected to thermal reduction to obtain the graphene aerogel microspheres. The preparation method is simple and convenient to implement, no environmental pollution is generated, and the obtained graphene aerogel microspheres are uniform in size and large in specific area, are of a stable center-divergence multi-porous-channel network structure and are used for adsorbing environmental pollutants.
Owner:SICHUAN UNIV
Functionalized homogeneous particle porous silicon dioxide microspheres and preparation method and application thereof
ActiveCN102070152AControl apertureControl structureIon-exchange process apparatusSilicaMicrosphereCompound (substance)
The invention discloses functionalized homogeneous particle porous silicon dioxide microspheres and a preparation method and application thereof. The preparation method comprises the following steps of: (1) pre-preparing homogeneous particle porous polymer microspheres with determined components, particle diameters and apertures, and performing surface functionalized treatment on the porous polymer microspheres to obtain the functionalized homogeneous particle porous polymer microspheres; (2) dispersing the functionalized porous polymer microspheres in aqueous solution and adding silicon dioxide precursor to prepare silicon dioxide / polymer intermediate composite microspheres; (3) heating the silicon dioxide / polymer intermediate composite microspheres to remove the polymer to obtain the homogeneous particle porous silicon dioxide microspheres; and (4) performing surface modification on the homogeneous particle porous silicon dioxide microspheres by using a chemical reagent to form a functionalized group, wherein the particle diameter of the functionalized homogeneous particle porous silicon dioxide microspheres is within the range of between 1.7 and 100 microns; and the mesoporous aperture of the functionalized homogeneous particle porous silicon dioxide microspheres is within the range of between 20 and 1,000 angstroms. The functionalized homogeneous particle porous silicon dioxide microspheres can be used as chromatographic filler for efficiently analyzing and separating organic molecules and biological molecules.
Owner:SUZHOU NANOMICRO TECH CO LTD
Preparation method of metallic nano powder
A process for preparing nano-class metal particles by dual-pouring method features that under the existance of protector and regulator, the metallic salt is reduced by reducing agent to obtain one ormore (30-100 nm) metallic particles. Its advantages are high dispersity, easy control of diameter, high output rate up to 95%, and preparing the particles of more metals by a single equipment.
Owner:TIANJIN ZHONGKE PHYSICAL & CHEM NEW MATERIAL TECH CO LTD
Preparation method of echinoid titanium dioxide microspheres in single/double layer cavity structure
InactiveCN101941736ALarge specific surface areaEasy to shapeTitanium dioxideMicrosphereSilicon dioxide
The invention relates to a preparation method of echinoid titanium dioxide microspheres in single / double layer cavity structure, belonging to the field of nano composite materials. The method comprises the following steps: (1) preparing monodisperse silicon dioxide microspheres with uniform particle size; (2) by using silicon dioxide as a template, coating a titanium dioxide layer on the surface of the silicon dioxide microspheres by using a sol-gel method to obtain core-shell type silicon dioxide / titanium dioxide composite microspheres; (3) regulating the concentration of sodium hydroxide solution, the hydrothermal reaction time and other conditions, and preparing echinoid titanium-base microspheres in the single / double layer cavity structure in a controllable way; and (4) treating the echinoid titanium-base microspheres in the single / double layer cavity structure with hydrochloric acid with a certain concentration, and calcining at high temperature to obtain anatase-type echinoid titanium dioxide microspheres in the single / double layer cavity structure. The material prepared by the method has the high-activity pure-phase titanium dioxide crystal structure, and has the advantages of large specific area, complete appearance and high yield; the technical process is controllable and easy to operate; and the invention also has the advantages of low preparation cost, no pollution and low energy consumption.
Owner:UNIV OF SCI & TECH BEIJING
Core-shell polyacrylamide microsphere profile controlling oil displacement agent and preparation method thereof
ActiveCN103739778AEfficient recyclingAchieving a green cycleDrilling compositionMicrosphereMicrometer
The invention discloses a core-shell polyacrylamide microsphere profile controlling oil displacement agent and a preparation method thereof. The method comprises the following steps: fully stirring and dissolving acrylamide, cationic monomer, a crosslinking agent and an initiator to synthetize a core part by adopting a dispersion polymerization method; fractionally adding a mixed solution of the acrylamide, anionic monomer, third monomer, the crosslinking agent and the initiator into a reaction device, controlling reaction conditions to be invariant, and reacting on the surface of the core to generate a shell part, thereby obtaining the core-shell polyacrylamide microsphere profile controlling oil displacement agent taking the cationic polyacrylamide as the core and taking the anionic polyacrylamide polymerized on the surface of the core as the shell, wherein the particle size range of the microsphere profile controlling oil displacement agent is from 1micrometer to100 micrometers. The microsphere profile controlling oil displacement agent has the advantages that the microsphere has an interpenetrating polymer network system and is capable of forming a viscoelastic body after absorbing water and forming a gel body after a certain time, so that the oil displacement agent is long in plugging time and little in leakage and is capable of bearing the pressure of more than 5MPa.
Owner:TIANJIN UNIV
Method for preparing monodisperse polystyrene microsphere with controllable grain diameter
InactiveCN101293936ALow purity requirementGood monodispersityHydrocarbon purification/separationHydrocarbonsPotassium persulfateMicrosphere
The invention belongs to the technology field of nanometer materials preparation, particularly relates to a preparation method of monodisperse polystyrene microspheres capable of controlling the particle size of the polystyrene microspheres within a certain range by changing the use amount of a stabilizer. The invention prepares polystyrene microspheres with simply purified styrene as a monomer, potassium persulfate as an initiator, water as a reaction medium and polyvinylpyrrolidone as a stabilizer by using soap-free emulsion polymerization. The preparation method uses electromagnetic stirring instead of electric stirring; and has the advantages of relatively low requirements for the uniformity of stirring speed, no need of surfactant, simple process, and low cost. The obtained polystyrene microspheres have good monodispersity, and the particle size thereof can be controlled within the range of 250-1,400nm by changing the use amount of the stabilizer. The monodispersed polystyrene microspheres have important application value as a module or template in construction of photonic crystals, inorganic / organic nanometer composite materials and hollow micrometer / nanometer spheres.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
Copolymerization reaction method for styrene/maleic anhydride
A copolymerization method of phenylethene / maleic anhydride belongs to polymer preparation technical field, for resolving the defect caused by stabilizer in traditional disperse polymerization system, which comprises under nitrogen gas protection, dissolving monomer Man and St, inducer organic hyperoxide or azocompound of suitable ratio in organic acid alkyl ester, the mixture of aromatics and organic acid alkyl ester or the mixture of ketone and alkane to react for 1 / 4-12h at 60-90 DEG C to obtain the disperse system of polymer microballoon, wherein the average particle diameter of microballoon in the disperse system is 90-1715mm, the disperse factor is 1.04-1.004 and the number average molecular weight is 80000-300000g / mol. The invention has the advantages of eliminated stabilizer, simple process, low cost, clean polymer microballoon or particle surface, controllable particle diameter, controllable shape and narrow granularity distribution.
Owner:BEIJING UNIV OF CHEM TECH
Chitosan nanoparticle suspension preparation method and application thereof
ActiveCN105001433AGood biocompatibilityUniform shapeAntibacterial agentsAerosol deliveryAcetic acidAntibiosis
The present invention discloses a chitosan nanoparticle suspension preparation method and application thereof. The chitosan nanoparticle suspension preparation method comprises the following steps of: (1) dissolving a chitosan into a glacial acetic acid aqueous solution to prepare a chitosan aqueous acetic acid; (2) under stirring, adding a tripolyphosphate sodium aqueous solution dropwise to obtain a coarse chitosan nano suspension; and (3) after filtering the coarse chitosan nano suspension, processing homogeneously the filtered suspension with high pressure to obtain a nano chitosan suspension with a uniform particle size distribution. The invention has the advantages of simple operation, good scale-up preparation reproducibility, and low production cost, and is applicable to industrial production. The prepared nanoparticles are of a uniform morphology, small in particle diameter and applicable to preparing products with functions of antibiosis, hemostasis and promoting tissue repair.
Owner:NANJING XINTONG RUIYI MEDICINE SCI & TECH
Polypeptide drug sustained-release microsphere preparation and preparation method thereof
ActiveCN102688198AUniform particle sizeNarrow particle sizePeptide/protein ingredientsMetabolism disorderFreeze-dryingMicrosphere
The invention discloses a polypeptide drug sustained-release microsphere preparation and a preparation method thereof. The method comprises the following steps of: dissolving the polylactic acid-glycollic acid copolymer or polylactic acid, a protective agent and a polypeptide drug in an organic solvent to form a completely uniform mixed solution; adding the mixed solution into an oil phase to form emulsion; removing the organic solvent; and performing centrifugal washing and freeze drying to obtain the polypeptide drug sustained-release microsphere. In the invention, an O / O method is adopted, the problem that the drug spreads toward the outer aqueous phase in the multiple-emulsion preparation method is solved, and the drug encapsulation efficiency is improved to 60-95%. The biological active polypeptide drug is degraded in the body and slowly released with the polymer material of the microsphere through the pores on the microsphere surface; the release time can be as long as several weeks and even several months; and the in-vitro release test indicates that the release conforms to similar zero-order release.
Owner:AC PHARMA CO LTD
Process for preparing cross-linked sodium hyaluronate microspheres capable of being adopted as emboliaztion agent by adopting sodium hyaluronate as raw material
The present invention provides a process for preparing cross-linked sodium hyaluronate microspheres capable of being adopted as an emboliaztion agent by adopting sodium hyaluronate as a raw material. The process comprises the following steps: preparing a sodium hyaluronate alkaline solution gel with a concentration of 10-30% g / ml; adding the sodium hyaluronate alkaline solution gel to an emulsifier-containing oil phase, and carrying out high speed emulsification through a shearing machine, wherein an emulsification speed is 500-2000 rpm, and a time is 10-20 min; adding a certain amount of a cross-linking agent, stirring for 4-6 h at a room temperature, carrying out a cross-linking reaction, and standing overnight after completing the reaction, wherein a mass percentage of the cross-linking agent in the oil phase is 0.2-2%; and adopting a water-soluble organic solvent to wash to remove the oil phase remained on the surface of the microspheres, and finally drying to obtain the cross-linked sodium hyaluronate microspheres. According to the present invention, the preparation process is simple; and the size of the obtained microspheres is suitable for routine blood vessel emboliaztion, and the obtained microspheres have characteristics of controllable particle size, good microsphere shape, easy screening, elasticity, expandibility, no toxic-side effect on human body, good biocompatibility, good biodegradability, and ensured clinical safety.
Owner:HANGZHOU SINGCLEAN MEDICAL PROD
Macromolecular microcarrier and preparation method thereof
InactiveCN101972481AOutflow smoothlyHigh drug entrapment ratePeptide/protein ingredientsDrug compositionsDrugs solutionFreeze-drying
The invention discloses a macromolecular microcarrier and a preparation method thereof, belonging to the technical field of biomedicine. The preparation method comprises the following steps of: splitting a silk solution and a drug solution into micrometer grade liquid drops with core-shell structures under the action of a high-voltage electric field by adopting a coaxial high-voltage electrostatic technology and a freeze drying method; concreting through liquid nitrogen, and then preparing the microcarrier which is difficult to dissolve in water through freeze drying. The microcarrier is in the shape of a microsphere with the core-shell structure, and the diameter of the microsphere is 100-500 micrometers; the shell of the microcarrier comprises the components of silk fibroin; the random-coil conformation of silk fibroin molecules is 80-90 percent; the shell is in a porous structure, and an aperture is 5-20 micrometers; and a core of the microcarrier comprises the components of water-soluble drugs. The silk microcarrier has extensive application prospect in the fields of cell culture, drug release, and the like.
Owner:SUZHOU UNIV
Preparation method of biocompatible aqueous phase quantum point
InactiveCN101381600AHigh fluorescence efficiencyGood stabilityLuminescent compositionsBiological macromoleculeOrganic molecules
The invention discloses a method for preparing a biocompatible aqueous quantum dot. The method comprises the following steps: a high-quality quantum dot and a nucleocapsid structure thereof are prepared; a surface modification technology is combined; the nucleocapsid structure is utilized to improve the stability of the quantum dot; through mutual action of intermolecular force, an organic molecular chain on the surface of the quantum dot is changed; an organic molecule of a long chain on the surface of an oil-phase quantum dot is changed into a small molecule which contains sulfhydryl and carboxyl or amidocyanogen and has biocompatibility and is water-soluble or a derivative of a large biological molecule; and finally, the biocompatible aqueous quantum dot which can be directly dissolved in phosphate buffer and the like is obtained. The method has the advantages: the preparation and surface modification method of the quantum dot are simple and easy to control the quality, the dimension and the surface property of the quantum dot; the obtained aqueous quantum dot has the advantages of higher fluorescent efficiency, even distribution of particle diameter, strong stability and the like; and the aqueous quantum dot prepared by the method can be used for biological detection, medical diagnosis, energy transferring and the like.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Lithium ion battery carbon microsphere negative electrode material and preparation method thereof
ActiveCN103107319AHigh rate characteristicsLow costCell electrodesSecondary cellsSolventCarbon black
The invention relates to a preparation method of a lithium ion battery carbon microsphere negative electrode material. The method comprises: mixing carbon black, a binder and a solvent to prepare a slurry, conducting spray drying for molding, and then carrying out a high temperature treatment so as to obtain the lithium ion battery carbon microsphere negative electrode material. The lithium ion battery carbon microsphere negative electrode material provided in the invention has a high degree of sphericity and a controllable particle size, so that close packing of the negative electrode material is realized, the volume energy density of electrodes is enhanced. Meanwhile, lithium ions can be embedded from all directions, and the structural stability, the rate capability and the first coulombic efficiency of the material are improved. The carbon microspheres internally have size-controllable gaps, which make up a plurality of ion transport channels, thus being conducive to improving the charge-discharge capacity and cyclic capacity retention rate of the material. Also, the main preparation raw material is carbon black, which has wide sources, no need for breaking, and a low price. And the preparation method has the advantages of simple process, environmental friendliness, low energy consumption and cost, and is easy for large scale production.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
Loaded and non-loaded catalyst and preparing method
InactiveCN101069850ASimple processLow costMetal/metal-oxides/metal-hydroxide catalystsSaline waterActive component
The present invention relates to a preparation method of catalyst whose active component particle form and crystal face orientation can be controlled. Said preparation method includes the following steps: (a), preparing soluble metal salt aqueous solution of active component, the concentration of metal salt in the solution is 1.0 X 10 to the power-6-10mol / L, adding alkali solution to make pH value be 3-9; (b), preparing aqueous solution of protection agent and stabilizing agent, the concentration of protection agent and / or stabilizing agent in said aqueous solution is 1.0 X 10 to the power-5-20mol / L, adding alkali solution to make pH value be 4-9; (c), uniformly mixing two solutions respectively obtained in step a and step b, using reducing agent to make reduction; and (d), adding setting agent into the mixed solution obtained in step c, filtering and drying so as to obtain the non-supported catalyst. Besides, in the step d, after a carrier is added, the settling agent is added further, filtered and dried so as to obtain the supported catalyst.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Novel method for performing copolymerization reaction of dicyclopentadiene and maleic anhydride
Owner:BEIJING UNIV OF CHEM TECH
Process for producing cross-linked polymer microsphere with even grain diameter
The invention relates to a preparation method of crosslinked polymer microphere with uniform particle size. By adopting the process of dispersion and polymerization, styrene or acrylic ester is taken as a monomer; a monodisperse crosslinked polymer microphere with uniform particle size is prepared by steric hindrance dispersant and multi-functional crosslinker. The microphere has regular spherical and solid, a smooth surface, no damage or defect, and the strength and flexibility meet the requirements of producing ACF.
Owner:杜天鹏
Method for preparing lignin urea-formaldehyde pesticide microcapsule
InactiveCN102349509AHigh reactivityImprove physical and chemical propertiesBiocideAnimal repellantsOil emulsionActive agent
The invention discloses a method for preparing a lignin urea-formaldehyde pesticide microcapsule. According to the invention, the method comprises the following steps: taking modified lignin, formaldehyde and urea as a monomer, forming a water-soluble performed polymer under base catalysis, diluting and forming continuous phase, forming dispersed phase by pesticide, an organic solvent and a surfactant, mixing and stirring the continuous phase and the dispersed phase to form an oil-in-water emulsion, performing in situ condensation polymerization under the acidic condition, heating and solidifying, pumping filtration and washing, drying to obtain the solid microcapsule particles. The modified lignin is obtained by formaldehyde hydroxymethyl modification of the industrial grade wheat straw soda lignin. According to the invention, the waste wheat straw soda lignin in paper industry is taken as the main wall material, so that the production cost of the microcapsule can be effectively reduced and the resource utilization of waste biomass can be realized. The preparation method of the invention has the advantages of simple process, rapidity and controllable microcapsule particle size, and is capable of realizing the industrial production, increasing the pesticide utilization rate, prolonging the persistent period, minimizing the environmental pollution in the process of agriculturalproduction, reducing the agriculture production cost and the like, and has good market prospect.
Owner:SOUTH CHINA AGRI UNIV
High-density and small-particle size nickel-cobalt-manganese hydroxide and preparation method thereof
InactiveCN107640792AHigh density and small tap densityLow tap densityCell electrodesSecondary cellsHigh densityManganese
The invention discloses a high-density and small-particle size nickel-cobalt-manganese hydroxide and a preparation method thereof. For the high-density and small-particle size nickel-cobalt-manganesehydroxide provided by the invention, a general chemical formula is NixCoyMnz(OH)2, wherein x+y+z=1, x is larger than or equal to 0.3 and smaller than or equal to 0.8, y is larger than or equal to 0.1and smaller than or equal to 0.4, and z is larger than or equal to 0.1 and smaller than or equal to 0.4; the particle sizes are d10 larger than or equal to 2 microns, d50 equal to 2.5-4 microns and d90 smaller than or equal to 6 microns, the tap density is larger than or equal to 1.4g / cm<3>, the specific surface area is 5-20m<2> / g, and the shape is spherical or spheroidal. The invention also discloses the preparation method of the high-density and small-particle size nickel-cobalt-manganese hydroxide. The preparation method is strong in controllability, can stably control the particle sizes ineach production batch without using a surfactant and is low in production cost, high in efficiency and good in physicochemical index of a final product.
Owner:ZHUJI PAWA NEW ENERGY
Preparation method of vanadium sodium fluophosphate cathode material of hybrid ion battery
InactiveCN102306771AShape is easy to controlGood carbon coatingCell electrodesRoom temperatureFree cooling
The invention provides a preparation method of a vanadium sodium fluophosphate cathode material of a hybrid ion battery. The method comprises the following steps: 1) grinding of a mixed material: taking trivalent or pentavalent vanadium oxide (V), ammonium dihydrogen phosphate (P), sodium fluoride (F) and a reducing agent carbon source (C) as raw materials, wherein the molar ratio of V to P to F is 2:(1.9-2.3):3, the molar ratio of V to C in the reducing agent carbon source is 1:(1-2), then weighing carbon source accounting for 3-5% of the total weight of the raw materials to serve as a conductive agent, and carrying out mixed grinding to obtain a precursor mixture; 2) precalcination: precalcinating the precursor mixture for 6-10 hours at the temperature of 300-400 DEG C at the warming speed of 3-5 DEG C per minute under the protection of inert gas, cooling the mixture to room temperature and taking out the mixture for secondary grinding; and 3) secondary calcination: carrying out the secondary calcination on the mixture ground in the step 2) for 6-10 hours at the temperature of 550-750 DEG C at the warming speed of 3-5 DEG C per minute under the protection of the inert gas, and naturally cooling to room temperature to obtain the vanadium sodium fluophosphate cathode material. The vanadium sodium fluophosphate cathode material has good electrochemical performance which is obviously improved.
Owner:CENT SOUTH UNIV
Nitrogen-doped graphene-loaded Pt-based alloy nanometre electrocatalyst and preparation method thereof
InactiveCN103413951AImprove electrocatalytic activityHigh catalytic activityMaterial nanotechnologyCell electrodesDoped graphenePtru catalyst
The invention relates to a nitrogen-doped graphene-loaded Pt-based alloy nanometre electrocatalyst and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: uniformly stirring graphene oxide, ethanediol and N-methylpyrrolidone in a mass ratio of (30 to 60): (1100 to 2800): (500 to 1600), and performing an ultrasonic dispersion treatment, so as to obtain a uniformly-dispersed suspension liquid; adding a metal salt solution and an H2PtCl6.6H2O solution in the uniformly-dispersed suspension liquid, uniformly stirring, and performing an ultrasonic dispersion treatment, so as to obtain a precursor; heating the precursor to 90-180 DEG C in an oil bath in a stirring condition, insulating heat, and performing condensation reflux for 1 to 5 hours, so as to obtain a black turbid liquid; performing vacuum suction filtration on the black turbid liquid, sequentially washing by acetone, distilled water and absolute ethyl alcohol, and performing vacuum drying at a room temperature to obtain the nitrogen-doped graphene-loaded Pt-based alloy nanometre electrocatalyst. The preparation method disclosed by the invention is simple in process and low in energy consumption; the prepared nitrogen-doped graphene-loaded Pt-based alloy nanometre electrocatalyst is high in catalytic activity, good in stability, uniform in the dispersion of nanometre particles, and controllable in the particle size of the nanometre particles.
Owner:WUHAN UNIV OF SCI & TECH
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com