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349results about How to "Uniform size" patented technology

Graphene, silver phosphate and titanium dioxide dual-functional composite and method for preparing same

The invention discloses a graphene, silver phosphate and titanium dioxide dual-functional composite and a method for preparing the same, and belongs to fields of photocatalysis technology, biological antibiosis and water pollution control. The method includes steps of ultrasonically treating oxidized graphene in water to obtain oxidized graphene dispersion liquid; dissolving silver phosphate in deionized water, adding the deionized water with the silver phosphate into the oxidized graphene dispersion liquid under the condition of stirring, and then stirring the oxidized graphene dispersion liquid to obtain mixed solution A; ultrasonically dispersing P25 in deionized water to prepare dispersion liquid, dripping the P25 dispersion liquid into the mixed solution A under the condition of magnetic stirring, and then stirring the mixed solution A to obtain mixed precursor solution B; and dripping phosphate solution into the mixed precursor solution B, then continuing stirring the mixed precursor solution B, shifting the mixed precursor solution B into a hydrothermal reaction kettle to enable the mixed precursor solution B to react so as to obtain a product, cooling the product to the room temperature, centrifuging the product, then washing the product and performing vacuum drying for the product to obtain the composite. The prepared composite not only can quickly degrade organic pollutants with certain concentration when irradiated by visible light, but also has broad-spectrum and efficient bactericidal activity for various bacteria.
Owner:JIANGSU UNIV

Preparation method of grain size controllable monodisperse nano starch microspheres

The invention aims to provide a method of controlling the grain size of starch microspheres so as to further prepare monodisperse nano starch microspheres in different grain sizes. The technical scheme provided by the invention is as follows: the preparation method comprises the following steps: preparing a starch solution; adding a water soluble surfactant and inorganic salt into the starch solution to obtain a water phase matter; adding an oil soluble surfactant and a co-surfactant into an organic solvent to obtain an oil phase matter; and mixing the water phase matter with the oil phase matter to obtain a water in oil starch microemulsion, cross-linking and solidifying, collecting precipitates, and washing and drying the precipitates to obtain white-to-yellowish powder which is the monodisperse nano starch microspheres. According to the preparation method provided by the invention, the grain size of the starch microspheres can be precisely controlled within a certain range (20-200nm) through selection of reaction raw materials and control of technical conditions, and the grain size is distributed in a monodisperse mode. The starch microspheres can be used as a carrier of a medicine, has better targeting and is oriented to a special organ or focus part.
Owner:XIHUA UNIV

Composite anode material for lithium sulfur battery, preparation method and application thereof

The invention relates to a high-performance sulfur and set-appearance conductive polymer composite anode material for the anode of a lithium sulfur battery and a preparation technique thereof, belonging to the field of chemical power supplies. The composite anode material for the lithium sulfur battery provided by the invention is a sulfur and conductive polymer nanotube composite anode material. The sulfur is dispersed and absorbed on the surface of the conductive polymer nanotube and in the conductive polymer nanotube to form a hollow fibrous structure. The invention uses high-conductivity polymers with good adsorbability to the sulfur and the reduced product thereof as a conductive phase in a sulfur electrode, uses a co-heating method and a liquid sulfur infiltration method to enable the polymers to be evenly combined with the sulfur to obtain a composite electrode material, and solves the problems that the sulfur electrode and the reduced product thereof in the lithium sulfur battery are apt to be dissolved in organic electrolytes, the battery circulation performance is poor because of the non-conductivity of the sulfur and the like. The sixtieth cycling capacity of the composite material is larger than 650mAh/g and the electrochemical cycling stability is good.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI

High-nickel type lithium Ni-Co manganate precursor with specific morphology and preparation method thereof

ActiveCN107342417AUniform sizePerfect sphericityCell electrodesNitrogen gasSmall particle
The invention discloses a high-nickel type lithium Ni-Co manganate precursor with specific morphology. The mean grain size of the primary particle of the precursor is 200-500nm; the granularity D10 of the secondary particle aggregate is not less than 6 microns; D50=11-15 microns, D90 is not more than 30 microns, the degree of sphericity of each of the secondary large particle and the secondary small particle is perfect, and the primary particle is filamentous. The preparation of the precursor comprises the following steps: firstly preparing a soluble mixed salt solution; adding ammonia water as the reaction kettle base solution, and regulating the pH of the base solution; inflating the nitrogen into the reaction kettle and starting the stirring; combining the configured soluble mixed water solution, the alkali and the ammonia water to add in the reaction kettle to perform the stirring reaction, reacting for some time, circularly pumping the early unqualified material into the reaction pump, performing ageing, filter-pressing and washing on the overflow material, drying, screening and then saving. The product disclosed by the invention is good in consistency and has specific morphology; the process efficiency is higher, and the product stability is better.
Owner:SHANSHAN ENERGY (NINGXIA) CO LTD

Method for preparing ferromagnetic metal simple-substance microsphere having flower-shaped layering nanostructure

The invention provides a method for preparing a ferromagnetic metal simple substance microsphere with a floriform hierarchical nanostructure, which comprises the following steps: adding dissoluble bivalent ferromagnetic metal salt into ethylene glycol solution, dissolving the dissoluble bivalent ferromagnetic metal salt through stirring to form first solution; weighing certain amount of surfactant to be dissolved in the first solution, fully stirring the mixture to form second solution; adding hydrazine hydrate with certain concentration into the second solution to obtain third solution through complex reaction; and then, placing the third solution in an airtight reaction vessel, keeping the temperature to obtain depositions; and finally, washing and drying the depositions so as to obtain the ferromagnetic metal simple substance microsphere with the floriform hierarchical nanostructure. The ferromagnetic metal simple substance microsphere with the floriform hierarchical nanostructure prepared by the method has the advantages of even size, regular crystal form, low cost of required raw materials, and no need of nitrogen protection in the preparation process; and the homogeneous ferromagnetic metal simple substance microsphere with the floriform hierarchical nanostructure can be obtained at relatively low temperature (between 200 and 220 DEG C). Besides, the method has the advantages of simple process, mass preparation and application to large-scale production.
Owner:SHANGHAI SECOND POLYTECHNIC UNIVERSITY

Method for preparing photocatalytic material with graphene-covered cadmium sulfide nuclear shell structure

The invention discloses a method for preparing a photocatalytic material with a graphene-covered cadmium sulfide nuclear shell structure. The photocatalytic material with the nuclear shell structure is high in monodispersity and controllable in particle size; furthermore, the photocatalytic material is extremely high in photocatalytic degradation efficiency to a simulated organic pollutant rhodamine B in a water body. A cadmium sulfide microsphere is prepared by a hydrothermal technology, and then the surface of the cadmium sulfide microsphere is coated with a layer of graphene, so that the nitrogen- and cerium-doped titanium dioxide photocatalytic material is finally prepared. The photocatalytic material with the graphene-covered cadmium sulfide nuclear shell structure, which is prepared by the method disclosed by the invention, is high in monodispersity; furthermore, the size of the product can be controlled according to a reaction condition, and the specific area is large; the photocatalytic material is higher in photocatalytic reaction efficiency and has a wide application prospect. The preparation method and the technology are simple and environment-friendly; the raw materials and equipment are cheap and readily available and are low in cost; the synthesis time is short, and the efficiency is high; the method has an extremely wide industrial production prospect.
Owner:SHAANXI UNIV OF SCI & TECH

Inverted polymer solar cell of Ag nano particle compounded cavity transmission layer and fabrication method

ActiveCN102983277AUniform sizeImprove interface contact performanceFinal product manufactureSolid-state devicesSurface plasmonHole transport layer
The invention belongs to the technical field of organic photoelectric devices, and particularly relates to an inverted polymer solar cell of an Ag nano particle compounded cavity transmission layer and a fabrication method of the inverted polymer solar cell. The inverted polymer solar cell is characterized in that ITO (indium tin oxide) conducting glass serves as a cathode (1); N type TiO2 serves as a cathode buffer layer (2); a polymer serves as an active layer (3); MoO3/Ag nano particle/MoO3 serves as a anode buffer layer (4); and Ag serves as a anode (5). The active layer (3) is mixed by a donor material namely P3HT (Poly [3-hexylthiophene-2, 5-diyl]) with an accepter material namely PCBM ([6, 6]-phenyl-C61-butyric acid methyl ester) according to a mass ratio of 1:0.8-1; and the thickness of each Ag nano particle is 1-5nm. The utilization ratio of sunlight by the active layer is increased through localized surface plasma action and backscattering enhancing action of the Ag nano particles; in addition, the interfacial contact property between the active layer and an electrode is improved; the anode-toward transmittability of current carriers is improved; the short circuit current density of the inverted polymer solar cell is increased; and the energy transformation efficiency is improved.
Owner:JILIN UNIV +1

Functionalized modified polyvinyl alcohol embolic microsphere and preparation method thereof

ActiveCN106729953AUniform sizeGood suspension and deformation elasticitySurgical adhesivesPharmaceutical non-active ingredientsChemistryTreatment field
The invention relates to a functionalized modified polyvinyl alcohol embolic microsphere and a preparation method thereof, and belongs to the field of medical intervention treatment. The functionalized modified polyvinyl alcohol embolic microsphere is prepared by taking polyvinyl alcohol as a base material, taking amino/hydroxyl carboxylic acid derivatives/sulfonic acid derivatives capable of crosslinking after acylation as a modifying agent and performing modification. The modified microsphere prepared by the method has perfect sphere shape, uniform size, high suspending property and shape change elasticity of the polyvinyl alcohol microsphere before modification. Meanwhile, a polycarboxylic/mucopolysacchariden functional group with negative charges is introduced and can be combined with micromolecular anti-tumor medicines with positive charges, so that the microsphere has high medicine loading property. Compared with the polyvinyl chloride microsphere which is not functionalized and cannot carry medicines or the microsphere which only introduces single group with negative charges and has low medicine carrying quantity in the prior art, the microsphere increases the medicine carrying quantity and improves the controlled release capability greatly.
Owner:SUZHOU HENGRUI CALLISYN BIOLOGICAL MEDICINE TECH CO LTD
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