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7841 results about "Dispersity" patented technology
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In chemistry, the dispersity is a measure of the heterogeneity of sizes of molecules or particles in a mixture. A collection of objects is called uniform if the objects have the same size, shape, or mass. A sample of objects that have an inconsistent size, shape and mass distribution is called non-uniform. The objects can be in any form of chemical dispersion, such as particles in a colloid, droplets in a cloud, crystals in a rock, or polymer macromolecules in a solution or a solid polymer mass. Polymers can be described by molecular mass distribution; a population of particles can be described by size, surface area, and/or mass distribution; and thin films can be described by film thickness distribution.
Cation fluoride Gemini surface activator
InactiveCN1817431ALess quantityImprove stabilityTransportation and packagingMixingChemical structureCritical micelle concentration
A cationic fluoric surfactant Gemini and its chemical structure are disclosed. Its advantages are lower critical micell concentration, less consumption, and high dispersity, foam stability, penetrability and wettability.
Owner:EAST CHINA UNIV OF SCI & TECH +1
Method for using low-temperature plasma to prepare supported metal sulfide catalyst
InactiveCN103495427AGood dispersionAvoid exposureMaterial nanotechnologyMolecular sieve catalystsDispersityReaction temperature
The invention discloses a method for using low-temperature plasma to prepare a supported metal sulfide catalyst and belongs to the technical field of material science. The method is characterized by including: allowing ionization of hydrogen sulfide gas or gas containing hydrogen sulfide through gas discharge to form the low-temperature plasma distributed evenly, and using the low-temperature plasma to interact with supported metal salt precursor to generate metal sulfide. Due to the fact that the catalyst is avoided from being exposed in excessively high temperature, the prepared catalyst is free of thermal agglomeration, so that the catalyst is smaller in particle size and higher in dispersity. The method is suitable for preparation of various sulfide catalysts, metal sulfide can be supported on different materials to prepare various supported catalysts. The method has the advantages of low reaction temperature, low energy consumption, short preparation time and the like. In addition, processing objects are common metal salt, wide involve range is achieved, and the prepared catalyst is applicable to various common heterogeneous reactions.
Owner:DALIAN UNIV OF TECH
Metal powder for 3D printer and preparing method thereof
ActiveCN103785860AHigh sphericityUniform compositionAdditive manufacturing apparatusTransportation and packagingDispersityMetal particle
Owner:JIANGSU BOQIAN NEW MATERIALS CO LTD
Pattern forming method, and resist composition, developer and rinsing solution used in the pattern forming method
ActiveUS8017304B2Molding stabilityReduce roughnessPhotosensitive materialsPhotoprinting processesDispersityActinic Rays
Owner:FUJIFILM CORP
Method for preparing nanometer silver powder with accurately controlled particle size
The invention relates to a method for preparing nanometer silver powder with accurately controlled particle size, which comprises the following steps of: taking silver nitrate as a starting material, and reacting with a precipitant to form a uniform silver-containing precursor precipitate; and adding a reducing agent for reducing the silver-containing precursor precipitate while adding a silver crystal seed to obtain simple substance silver. The obtained silver powder particle is polyhedral or almost spherical, the powder body has good dispersity and uniformly distributed particle size, and particle size of the silver powder can be accurately controlled in the range of 20-300nm by controlling crystal seed size and addition. The invention is the method for preparing water solution system of nanometer silver powder which has accurately controlled particle size and is suitable for large scale production under normal temperature and normal pressure condition. The preparation method has moderate reaction condition and is simple and convenient, and the nanometer silver powder has low cost and stable quality.
Owner:山东建邦集团有限公司
Pattern forming method, and resist composition, developer and rinsing solution used in the pattern forming method
InactiveUS20100040971A1Reduced line edge roughnessGood size uniformityPhotosensitive materialsPhotomechanical exposure apparatusDispersityActinic Rays
A pattern forming method comprising a step of applying a resist composition whose solubility in a negative tone developer decreases upon irradiation with an actinic ray or radiation and which contains a resin having an alicyclic hydrocarbon structure and a dispersity of 1.7 or less and being capable of increasing the polarity by the action of an acid, an exposure step, and a development step using a negative tone developer; a resist composition for use in the method; and a developer and a rinsing solution for use in the method, are provided, whereby a pattern with reduced line edge roughness and high dimensional uniformity can be formed.
Owner:FUJIFILM CORP
Microporous-mesoporous molecular sieve containing noble metal, preparation method and application to catalytic reduction of p-nitrophenol
InactiveCN103011189AReduce pollutionLow cost of industrializationMolecular sieve catalystsOrganic compound preparationWater bathsDispersity
The invention belongs to the technical field of molecular sieve preparation, and particularly relates to an in-situ preparation method for a microporous-mesoporous molecular sieve containing noble metal. The in-situ preparation method comprises the steps as follows: adding a coupling pore-forming agent, a silicon source, an aluminum source or a titanium source, and an alkali source into a water solution of noble metal nano particles in sequence under the water bath condition; and ageing, drying, crystallizing, drying and carrying out high-temperature calcination to obtain the microporous-mesoporous molecular sieve containing the noble metal. The prepared microporous-mesoporous molecular sieve is provided with a hierarchical pore structure; the noble metal nano particles with high dispersity are covered in situ while a mesoporous structure is generated; and a synthetic method is convenient and simple, saves energy and reduces emission. A multifunctional catalyst prepared with the method integrates the advantages of the microporous channels of the molecular sieve, the transgranular meso pores and the intergranular meso pores of the molecular sieve and the noble metal nano particles, and is more suitable for catalytic reactions of sulfur-containing large molecules such as hydrogen desulfurization and the like.
Owner:JILIN UNIV
Preparing method for nitrogen-doped porous carbon material, catalyst comprising material and application of material
ActiveCN104689857AGood dispersionHigh bonding strengthCatalyst carriersOrganic compound preparationDispersityIn situ doping
The invention relates to a novel preparing method for an in-situ nitrogen-doped porous carbon material, the application of the in-situ nitrogen-doped porous carbon material serving as a carrier of a load type catalyst, the load type catalyst comprising the in-situ nitrogen-doped porous carbon material, and the application of the load type catalyst in the water phase alcohol condensation reaction. Cheap micromolecule nitrogen substances serve as a nitrogen source of the in-situ nitrogen-doped porous carbon material, nitrogen atom in-situ doping is achieved in the carbon material preparing process, the doping content of the in-situ nitrogen-doped porous carbon material is controllable, the in-situ nitrogen-doped porous carbon material is distributed evenly, the dispersity of metal in the carrier and the combining strength with the carrier can be improved through doping of nitrogen atoms, and therefore the catalytic activity of the nitrogen-doped porous carbon material can be improved, and the service life of the nitrogen-doped porous carbon material can be prolonged.
Owner:QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
Magnetic disk and method of manufacturing same
Owner:WD MEDIA SINGAPORE PTE
Method for preparing non-metallic element doped carbon coated metal nanoparticle magnetic composite
ActiveCN105478755AGood dispersionHigh purityTransportation and packagingMetal-working apparatusDispersityCyanamide compound
The invention discloses a method for preparing a non-metallic element doped carbon coated metal nanoparticle magnetic composite. The method comprises the steps that water-soluble metal divalent salt, a cyanamide compound and a nitrogen or boron or sulfur containing non-metallic compound are added into a methanol solution to be mixed, dissolved, dried and ground, and obtained homogeneous-phase powder is subjected to roasting pyrolysis under the protection of inert gas; and a pyrolysis product is subjected to acid pickling, washing, drying and grinding, and a target product is obtained. According to the whole preparing process of the method, metal ion reduction, metal nanoparticle coating and doping of nitrogen / boron / sulfur and other non-metallic elements are achieved in one step. The composite prepared through the method is high in degree of graphitization, good in dispersity between particles and high in purity, and the preparing method has the advantages that the cost is low, the process is simple, and large-quantity synthesis can be easily achieved.
Owner:合肥庐阳科技创新集团有限公司
Block copolymer membranes and associated methods for making the same
A separation matrix comprises a porous surface layer; and a bulk porous support, wherein both the porous surface layer and the bulk porous support comprising a block copolymer. The block copolymer comprises A-B or A-B-A repeating units, wherein A and B at each occurrence are two different blocks of oligomer, or polymer. A structural unit of block A is derived from one or more atom transfer radical polymerization (ATRP)-active monomer or oligomer and a structural unit of block B is derived from a thermoplastic ATRP-active macro initiator. A poly dispersity index of the block copolymer is at least about 2.
Owner:CYTIVA SWEDEN AB
Preparation method of hydrocracking catalyst
ActiveCN103055923AUnlimited capacityGood dispersionMolecular sieve catalystsHydrocarbon oil crackingMolecular sieveDispersity
The invention discloses a preparation method of a hydrocracking catalyst. The method comprises the steps of preparing an acidic mixed solution A containing hydrogenation reactive metals and silicon, preparing a sodium metaaluminate alkaline solution B, and then adding the acidic mixed solution A, the alkaline solution B and CO2 to a reaction tank filled with clear water in parallel to prepare gel; and then adding turbid liquid of a Y type molecular sieve, mixing the substances uniformly, filtering, drying and forming the mixture, and then washing, drying and roasting the product, thus preparing the hydrocracking catalyst. The method has the beneficial effects that a clean preparation method is adopted, so not only can the catalyst be easily formed and the strength of the catalyst be improved, but also the pore volume and specific surface area of the catalyst can be increased and the dispersity of metals in the catalyst can be improved, thus the catalyst has higher hydrocracking activity, middle oil selectivity and stability; and the catalyst prepared by the method can be used for a single-section hydrocracking process of a non-refining section or a one-section serial hydrocracking process of a refining section.
Owner:CHINA PETROLEUM & CHEM CORP +1
Graphene/clay composite material, and preparation method and application thereof
ActiveCN103143319AGood dispersionReduce reunionOther chemical processesWater/sewage treatment by sorptionIntercalation reactionDispersity
The invention belongs to the field of adsorbing materials, and relates to an inorganic-inorganic hybrid material, particularly a graphene / clay composite material. The composite material is powdery, is compounded from porous graphene and clay, and has a porous structure; the porous graphene is inserted among clay layers through intercalation reaction; the mass ratio of the porous graphene to the clay is 1:(0.1-10); the specific area of the graphene / clay composite material is 200-250 m<2> / g, and the weight loss within 900 DEG C is 3-6 wt%; and the clay is montmorillonite, vermiculite, illite, kaolin or rectorite. The graphene / clay composite material can be easily dispersed, can be used for comprehensively and efficiently adsorbing heavy metals and organic substances, and has the characteristics of high dispersity and efficient and selective adsorbability for heavy metals and organic substances; the maximum comprehensive removal rate can reach 99%; and thus, the invention has wide prospects in industrialized application.
Owner:JINAN UNIVERSITY
Preparation method of double-layer coated water-based aluminum pigment
The invention discloses a preparation method of a double-layer coated water-based aluminum pigment, which comprises the following steps: coating ethyl orthosilicate on lamellar aluminum powder to form a single-layer coated aluminum pigment; and under the action of an azo initiator, coating a hydrophilic ester monomer on the single-layer coated aluminum pigment to form the double-layer coated water-based aluminum pigment. The double-layer coated water-based aluminum pigment prepared by the method provided by the invention has the advantages of high coating tightness and favorable water resistance, and the coating layer can not be easily damaged. The organic layer on the outer layer is easily compatible with high-molecular rein in the paint, has favorable dispersity in the paint, and is mainly used in various water-based paints and water-based inks.
Owner:HEFEI SUNRISE PIGMENTS
Preparation method of supported metal catalyst
InactiveCN105562116ALow costHigh operational controllabilityCatalyst activation/preparationMetal/metal-oxides/metal-hydroxide catalystsDispersityDyeing wastewater
The invention discloses a preparation method and application of a supported metal catalyst. The supported metal catalyst comprises carrier framework materials and nano particles, loaded on the surfaces of the carrier framework materials, of metal or metal oxide, or metal ions chelated on the surfaces of the carrier framework materials, wherein the metal ions and nano particles of the metal or metal oxide are loaded on the surfaces of the carrier framework materials through the polymerization layers, adhered to the surfaces of the carrier framework materials, of catechol derivatives. The preparation method of the supported metal catalyst has the advantages that the method is simple, various carrier framework materials are used, one or more metal ions or nano particles can be loaded, and universality is achieved; the supported metal catalyst is good in active metal dispersity, large in carrier specific surface area, low in use amount, low in cost, and the like; the catalyst loaded with noble metal is catalyst material which is widely used and environmental friendly and is efficiently applicable to environmental chemical engineering fields such as dye wastewater decoloring, wastewater organic pollutant removing, car tail gas treatment, air purification, hydrogenation and reforming catalytic reaction, gas sensors and fuel cells.
Owner:YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
Lubricating oil additive based on single-layer or more-layer graphene
The invention relates to a lubricating oil additive based on single-layer or more-layer graphene, belonging to new high-tech materials and application field thereof and being mainly used for improving the property of lubricating oil. The lubricating oil additive is characterized in that single-layer or more-layer graphene and a dispersing agent are added into base oil, the content of the single-layer or more-layer graphene in the base oil is 0.0001-10 percent by mass, and the content of the dispersing agent in the lubricating oil is 0.001-2 percent by mass. The graphene has high specific surface area and thickness of 0.34-10 nanometers, is shaped as a sheet, is combined with the dispersing agent after being subjected to surface modification, and has excellent stability and dispersity in the base oil without easily precipitating like other additives. Under same filling amount, compared with the sheet graphite and the traditional graphite, more graphene can be absorbed on the secondary surface of the friction, the lubricating and anti-wear property of the base oil is improved, and the bearing capacity is enhanced.
Owner:JIANGSU POLYTECHNIC UNIVERSITY
Lithium ion battery silicon carbide composite anode material and preparation method thereof
The invention discloses a lithium ion battery silicon carbide composite anode material and a preparation method thereof and aims to solve the technical problem of improving the cycling stability of a silicon carbide cathode. The lithium ion battery silicon carbide composite anode material consists of the following components in percentage by mass: 85 to 75 percent of graphite and 15 to 25 percent of silica particles, wherein the nano silica particles are dispersed on a graphite carrier to form a nuclear shell structure and are 5 to 16 mum in granularity. The preparation method comprises the following steps of: preparing a graphite dispersing agent and a silicon grinding dispersing agent; adding the silicon grinding dispersing agent into the graphite dispersing agent; and performing thermal treatment. When the method is compared with the prior art, silicon atoms are dispersed on a graphite atomic nucleus by a cation-anion charge absorption method, so that the silicon atoms can uniformly wrap the surface of the graphite, the dispersity of silicon is effectively improved in a silicon carbide composite material preparing process, the initial efficiency and the cycling stability of the silicon carbide composite anode material are improved, and a battery using the material as an anode material has relatively high safety, multiplying power performance and cycle performance.
Owner:BTR NEW MATERIAL GRP CO LTD
Non-noble metal supported selective hydrogenation catalyst and preparation method and application thereof
ActiveCN101664682AEvenly distributedNarrow particle size distributionHydrocarbon purification/separationHydrocarbonsDispersityEmulsion
The invention relates to a non-noble metal supported selective hydrogenation catalyst and a preparation method and application thereof. The catalyst comprises a carrier, and a main active component and an auxiliary active component which are loaded on the carrier, wherein the main active component is nickel, and the auxiliary active component is at least one of Mo, La, Ag, Bi, Cu, Nd, Cs, Ce, Zn and Zr; and the active components exist in amorphous forms, the average grain diameter is less than 10 nanometers, and the catalyst is prepared by a micro-emulsion method. The catalyst has evenly distributed active components and high dispersity, and can resist the erosion of poisonous materials of arsenium, sulfur and the like. The catalyst has good hydrogenation performance which is higher than that of the prior level of the conventional non-noble metal catalyst and is close to the level of a noble metal Pd catalyst in the reaction for removing acetylene hydrocarbon through C2 selective hydrogenation.
Owner:CHINA PETROLEUM & CHEM CORP +1
Low-expansion coefficient polyvinyl chloride alloy material and manufacturing method thereof
The invention provides a low-expansion coefficient polyvinyl chloride alloy material and a manufacturing method thereof. The ingredients of raw materials of the alloy material comprise a polyvinyl chloride substrate, a heat-resistant modifier, a heat stabilizer, a lubricator, a filler and a processing agent, and the alloy material is manufactured by a melt blending technique. The processing agent and the filler in the ingredients of the raw materials of the invention are the processing agent that is subjected to modification by a new method and the filler that is subjected to organic treatment, and by means of a mechanochemical reaction, self-plastification, toughening and reinforcement of the PVC can be combined organically to improve compatibility and dispersity of the polyvinyl chloride, the filler and heat-resistant resin, thus settling the problem about the contraction between the improvement of heat expansion performance and heat resistance of the PVC, and processing performance, strength and toughness of the PVC; the polyvinyl chloride engineering plastic with low expansion coefficient, high heat resistance, high strength, high toughness, excellent aging resistance and outstanding processing performance is manufactured; the invention has extensive industrial market prospect and the manufacturing method thereof is simple in technology, convenient in operation and control, stable in quality and high in production efficiency.
Owner:SICHUAN UNIV
Pattern forming method, and resist composition, developer and rinsing solution used in the pattern forming method
ActiveUS20100040972A1Reduced line edge roughnessGood size uniformityPhotosensitive materialsPhotoprinting processesDispersityActinic Rays
A pattern forming method comprising a step of applying a resist composition whose solubility in a negative tone developer decreases upon irradiation with an actinic ray or radiation and which contains a resin having an alicyclic hydrocarbon structure and a dispersity of 1.7 or less and being capable of increasing the polarity by the action of an acid, an exposure step, and a development step using a negative tone developer; a resist composition for use in the method; and a developer and a rinsing solution for use in the method, are provided, whereby a pattern with reduced line edge roughness and high dimensional uniformity can be formed.
Owner:FUJIFILM CORP
Method for preparing active porous graphene
The invention provides a method for preparing active porous graphene. The method comprises the following steps: 1) bleaching cellulose by use of hydrogen peroxide to obtain a first intermediate product; 2) activating the first intermediate product by use of an activating agent to obtain a second intermediate product; 3) performing carbonization treatment on the second intermediate product at 600-1100 DEG C to obtain the active porous graphene. The invention aims to provide a method for preparing active porous graphene, and the active porous graphene prepared from the method provided by the invention has better conductivity and has better dispersity.
Owner:JINAN SHENGQUAN GROUP SHARE HLDG
ZSM-5 type molecular sieve for catalyst for reaction for preparing propylene from methanol and/or dimethyl ether
ActiveCN101624192AImprove diffusion abilityHigh P/E ratioMolecular sieve catalystsHydrocarbon from oxygen organic compoundsDispersitySilicon
The invention provides a ZSM-5 type molecular sieve for a catalyst for a reaction for preparing propylene from methanol and / or dimethyl ether, which has a silica alumina ratio of 250-1,150 and a grain diameter of 65-250nm. A preparation method of the molecular sieve comprises the following steps: (1) mixing an aluminum source and an organic directing agent and stirring an obtained mixture at constant temperature of 0-30 DEG C for 2-24 hours; (2) adding a silicon source and an organic addition agent to the mixed solution obtained in the step (1) and continuing stirring the mixed solution to obtain gel; (3) stirring the gel obtained in the step (2) at 35-95 DEG C and then carrying out a crystallization reaction for 24-240 hours at 60-200 DEG C, wherein in the raw materials for synthesizing the molecular sieve, and the molar ratio of OH<-1> to SO2 to AL2O3 to H2O to the organic directing agent to the organic directing agent is (0.1-0.35):1:(0.0005-0.01):(10-25):(0.1-0.6):(0.5-8). The ZSM-5 type catalyst has the characteristics of controllable grain size, adjustable silica alumina ratio, high dispersity, and the like and has higher propylene selectivity and P / E ratio in the reaction for preparing low carbon olefin from the methanol and / or the dimethyl ether.
Owner:DATANG INT CHEM TECH RESINST
Graphene based conductive ink and preparation method thereof as well as flexible conductive thin film
ActiveCN103013229AGood dispersionImprove conductivityConductive layers on insulating-supportsInksDispersityHydrogen
The invention discloses graphene based conductive ink, comprising 2-25 wt% of conductive component, 5-25 wt% of bonding agent, 0.1-5 wt% of additive, 0.1-2 wt% of pH (Potential of Hydrogen) adjusting agent and the balance of solvent. A preparation method comprises the following steps of: dispersing the pH adjusting agent into the solvent to obtain a uniform first mixed liquid; mixing the first mixed liquid with the bonding agent to obtain a second mixed liquid; and mixing the second mixed liquid with the conductive component and the additive to obtain the graphene based conductive ink. The invention further provides a flexible conductive thin film prepared from the conductive ink. The conductive ink disclosed by the invention has the advantages of good dispersity, good conductive effect, easiness for printing, and cheap price. Furthermore, the flexible conductive thin film prepared from the conductive ink disclosed by the invention has good conductive performance.
Owner:NINGBO GRAPHENE INNOVATION CENT CO LTD
Efficient silicone defoaming agent
InactiveCN102343165AGood anti-foam performanceGood dispersionFoam dispersion/preventionDispersityEmulsion
The invention discloses an efficient silicone defoaming agent, which mainly comprises a silicone grease mixture, a synergistic agent, a polyether silicone oil emulsifier, an assistant emulsifier, a thickening agent, preservative and water, wherein in an emulsifier emulsion, the silicone grease mixture and the polyether silicone oil emulsifier account for 70-90 percent of the amount of active matters; the active matters account for 5-30 percent of the amount of the emulsion; and water serves as another medium. In the efficient silicone defoaming agent, the foam inhibiting performance is enhanced by using the silicone grease mixture, the defoaming performance and dispersity are improved by using the polyether silicone oil emulsifier, and the silicone grease viscosity and compatibility are lowered and the emulsifying effect is improved by adding the synergistic agent. The efficient silicone defoaming agent has the characteristics of application to waterborne systems, high defoaming speed, good foam inhibiting effect, low using dosage, high chemical inertness, nontoxicity, capability of acting under severe conditions and low cost.
Owner:山东大易化工有限公司
Conjugated polymer, insolubilized polymer, organic electroluminescence element material, composition for organic electroluminescence element, polymer production process, organic electroluminescence element, organic el display and organic el lighting
ActiveUS20110042661A1Improve hole transport abilitySufficient solubilityElectroluminescent light sourcesSolid-state devicesDispersitySolubility
An object of the present invention is to provide a conjugated polymer which has a high hole transportability and is excellent in solubility and depositability. Another object of the present invention is to provide an organic electroluminescence element which is capable of low voltage driving and has a high luminous efficiency and drive stability. The conjugated polymer of the present invention is a conjugated polymer containing a specific structure as the repeating unit, where the conjugated polymer contains an insolubilizing group as a substituent, the weight average molecular weight (Mw) is 20,000 or more and the dispersity (Mw / Mn) is 2.40 or less.
Owner:MITSUBISHI CHEM CORP
Preparation method capable of realizing chemical blending of modified nano silicon dioxide particles in acrylate monomer
A preparation method capable of realizing chemical blending of modified nano silicon dioxide particles in an acrylate monomer relates to the field of the application of uniform dispersity of acryloyl oxygen radical contained silane couplint agent modified nano silicon dioxide particles in the acrylate monomer and the application of photocuring products in coating material. According to the method, the modified silicon dioxide is formed in a way that alkoxy on silane couplint agent and hydroxy on the surfaces of the nano silicon dioxide particles are reacted to form firm silicon-oxygen-silicon bonds; the double-bond silane couplint agent modified nano silicon dioxide is mixed in the monomer; during the photopolymerization process of the product, the acryloyl oxygen radical contained silane couplint agent modified nano silicon dioxide and the monomer are polymerized through the chemical bonds, so as to allow the nano silicon dioxide to be more uniformly distributed in the polymer; and the acryloyl oxygen radical contained silane couplint agent modified nano silicon dioxide particles are subjected to laser size analysis and transmission electron microscopy. The purpose of improving the application of the nano silicon dioxide composite acrylate monomer in the coating material field is achieved.
Owner:BEIJING UNIV OF CHEM TECH
High-scratch-resistance abrasion-resistant coating material and preparation method thereof
InactiveCN106752923AIncrease elasticityAvoid scratch damageFireproof paintsAnti-corrosive paintsDispersityMechanical property
The invention provides a high-scratch-resistance abrasion-resistant coating material and a preparation method thereof. The preparation method comprises the following steps: modifying the graphene surface by using active groups by a chemical modification technique to obtain modified graphene, and blending the modified graphene with polysiloxane to obtain the high-scratch-resistance abrasion-resistant nano composite coating material. The surface modification is carried out to enhance the dispersity of the graphene and the interactions between the graphene and polysiloxane matrix, thereby enhancing the mechanical properties of the coating. No pigment or filler is added. The scratch resistance of the transparent graphene / polysiloxane composite coating is enhanced by 140% or above, and the abrasion loss is reduced by 60% or above. The transparent graphene / polysiloxane composite coating has excellent adhesion, heat resistance, weather resistance, flame retardancy and corrosion resistance. The graphene / polysiloxane composite coating can be used for surface protection and shielding of various metals, plastics, wood, concrete, glass and other substrates, and is applicable to the fields of automobile paints, photoelectric materials, precision instruments, marine heavy-corrosion protection, buildings and the like.
Owner:FUDAN UNIV
Graphene/mesoporous titanium dioxide visible light catalyst and preparation method
InactiveCN102350334AUniform particle sizeUniform sizePhysical/chemical process catalystsWater/sewage treatment by irradiationDispersityAcetic acid
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.
Owner:JIANGSU UNIV
Method for preparing Ag-carrying bacterial cellulose hydrogel antimicrobial dressing and product thereof
The invention discloses a method for preparing an Ag-carrying bacterial cellulose hydrogel antimicrobial dressing and a product thereof. The method comprises the following steps of: soaking a bacterial cellulose hydrogel film in solution of silver metal precursor; then heating the film to be between 121 and 135 DEG C in a high-pressure sterilizing pot, and pressurizing between 0.205 and 0.313MPa; standing bacterial cellulose for 5 to 30min; and then taking the treated bacterial cellulose out for washing, partial dehydration, packaging and sterilization to obtain an Ag-carrying bacterial cellulose hydrogel antimicrobial dressing which is formed by compounding silver metal nano-particles and bacterial cellulose and is attached with 0.01 to 10 weight percent of the silver metal nano-particles in a bacterial cellulose three-dimensional porous network structure. The preparation process of the invention has the advantages of simplicity, easiness, convenient operation, controllable preparation technology, no pollution and low cost; and the prepared nano-particles have the advantages of high purity, small particle size, uniform size and good dispersity. The obtained Ag-carrying bacterial cellulose hydrogel antimicrobial dressing has the characteristics of good antimicrobial property, high water content, good water-retaining property, strong toughness, good air permeability and the like, and can meet the requirements of treating various wounds by a wet method.
Owner:DONGHUA UNIV +1
Carbon fiber composite material fatigue life estimating method based on stress ratio influences
InactiveCN103942441AAccurate lifeAccurate Damage AssessmentSpecial data processing applicationsStrength propertiesFinite element techniqueDispersity
The invention belongs to the technical field of composite materials, and discloses a carbon fiber composite material fatigue life estimating method based on stress ratio influences. Structural response calculation is carried out by means of a finite element technology. A finite element model is based on a classical laminate plate theory, and a umat subprogram taking tension and compression asymmetry into consideration is built. By carrying out constant-amplitude fatigue tests under different stress ratios, an equation of an influence mechanism of average stress on prediction of the service life of a carbon fiber composite material structure is built and is popularized to a block load and a spectrum load. A service life estimating model built through the method is based on the classical laminate plate theory and takes influences of the average stress and a variable-amplitude load into consideration, dispersity of a prediction result is little, accuracy is high, theoretical guidance is provided for reliability design of parts made of carbon fiber composite materials, and the technical problems that existing carbon fiber composite material structure fatigue life is only estimated through a test method, and accordingly cost is high and consumed time is long are solved.
Owner:SHANGHAI JIAO TONG UNIV
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