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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
Nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst and preparing method and application thereof
ActiveCN107999108AClear structureControllable structureCatalyst activation/preparationElectrodesIonTungsten
The invention provides a nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst and a preparing method and application thereof. The preparing method includes the following steps that a coprecipitation method is used for preparing a SEP compound material from a surfactant and heteropolyacid or polyoxometalate, the surfactant is a cationic surfactant or ionic liquid surfactant, and the heteropolyacid or polyoxometalate contains molybdenum or tungsten; the SEP compound material, melamine and phytic acid are used as raw materials for synthesizing a SEP-MA-PA compound material through a mixing and dissolving method; under protection of inert gas, the SEP-MA-PA compound material is subjected to heat treatment and cooled to obtain the nitrogen-phosphorus codopedcarbon loaded molybdenum carbide or tungsten carbide catalyst. Nanoparticles of the nitrogen-phosphorus codoped carbon loaded molybdenum carbide or tungsten carbide catalyst are small in size and areof a porous structure, by means of nitrogen-phosphorus heteroatom doping, the conductivity of the catalyst is enhanced, and the catalyst has efficient performance of electrolyzing water for preparinghydrogen.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Method for preparing metal nanoparticle composite bacterial cellulose and products thereof
ActiveCN101736572AEasy to controlLimit reunionFibre treatmentMicroorganism based processesBiopolymerMacromolecule
The invention particularly relates to a method for preparing metal nanoparticle composite bacterial cellulose and products thereof, and belongs to the composite field of metallic nanomaterials and biopolymer materials. The method comprises the following steps: soaking the bacterial cellulose into solution of metal precursor; then, heating the solution in a high-pressure vessel to 121 to 150 DEG C, pressurizing the solution to 0.205 and 0.476MPa, and standing the solution for 5 to 30 minutes; and taking the treated bacterial cellulose out for washing and drying to obtain the metal nanoparticle composite bacterial cellulose attached with 0.01 to 10 weight percent of metal nanoparticles in a bacterial cellulose three-dimensional porous network structure, which is compounded by the metal nanoparticles and the bacterial cellulose. The method has simple and easy preparation process, convenient operation, controllable preparation technology, no pollution and low cost; the prepared nanoparticles have high purity, small diameter of nanoparticles, uniform size and good dispersibility; and the method realizes controllable preparation of sizes and distribution of the nanoparticles by simply changing experiment conditions, and has wide application value in the field of industrialized production.
Owner:DONGHUA UNIV +1
Reduced graphene supported molybdenum or tungsten carbide catalyst and preparation method and application thereof
InactiveCN105562119ASmall sizeEvenly distributedCatalyst activation/preparationElectrodesDispersityElectrolysis
The invention belongs to the technical field of preparation of catalysts and particularly relates to a reduced graphene supported molybdenum or tungsten carbide catalyst and a preparation method and application thereof. The preparation method of the reduced graphene supported molybdenum or tungsten carbide catalyst comprises the following steps: (1), synthesizing a heteropolyacid-polymer conductor / reduced graphene composite through a one-pot reaction method by using molybdenum- or tungsten-containing heteropolyacid, a polymer conductor and graphene as raw materials; (2), under the protection of an inert gas, thermally treating at 700-1100 DEG C for 2-5 h, and cooling and pickling to obtain the reduced graphene supported molybdenum or tungsten carbide catalyst. The preparation method of the catalyst is simple, the presence of a unique structure provides a great limitation on the agglomeration of molybdenum or tungsten carbide nanoparticles and an enhancement in their dispersity, excellent hydrogen production from water electrolysis is shown, and the preparation method is also applicable to the fields of studies such as energy storage and conversion studies for electrocatalytic reduction of oxygen, lithium ion batteries and the like.
Owner:JINING UNIV
Method for preparing nano Ag/polymer antimicrobial film by utilizing irradiation method
The invention discloses a method for preparing nano Ag / polymer antimicrobial film by utilizing <60>Co-gama ray or electronic beam irradiation. The method comprises the steps of: dissolving an NVP (N-vinylpyrrolidone) monomer in one or any two of ethanol, methanol, water and acetone, then adding AgNO3 solution, evenly stirring, putting a polymer film into the mixed solution, vacuumizing, irradiating in a closed reaction container, taking out the polymer film, washing with water and drying to obtain the nano Ag / polymer antimicrobial film. No initiator or reductant needs to be added in the irradiation process, NVP is polymerized on the surface of the polymer when Ag<+> is reduced into nano Ag, the method has the advantages that the technology is simple, the process is controllable, the yield is high, the prepared nano Ag / polymer antimicrobial film has good hydrophilicity and safety, the antimicrobial rate to Escherichia coli 107CFU / ml in 24 hours can reach 97.7%-100%.
Owner:SICHUAN INST OF ATOMIC ENERGY
Method for preparing tungsten-molybdenum alloy by doping beneficial elements
ActiveCN106591613AImprove recrystallization temperature and high temperature performanceAvoid segregationTungstenPraseodymium
A method for preparing tungsten-molybdenum alloy by doping beneficial elements comprises the following steps: preparing doped molybdenum powder; preparing doped tungsten powder; and preparing the tungsten-molybdenum alloy through 82-87.5% of doped molybdenum powder, 11-15% of doped tungsten, and 1.5-3.0% of vanadium oxide. The tungsten-molybdenum alloy prepared by the method is outstanding in high-temperature creep resistance and tensile strength, and high in low-temperature strength; after being plastically deformed, lanthanum oxide and praseodymium oxide are dispersed into fine second-phase particles under high temperature and are regularly arranged, so that the strengthening effect can be achieved.
Owner:LUOYANG KEWEI MOLYBDENUM & TUNGSTEN
Preparation method of nano-silver/carbon nanotube composite conductive ink
The invention discloses a preparation method of nano-silver / carbon nanotube composite conductive ink, belongs to the technical field of ink preparation. The preparation method comprises the followingsteps: introducing polar groups to the surfaces of carbon nanotubes, and ultrasonically dispersing the carbon nanotubes in ethanol to prepare a carbon nanotube ethanol solution; reducing and loading nano-silver on the prepared carbon nano-tubes to prepare a nano-silver / carbon nanotube conductive composite filler; and compounding the conductive filler, flaky nano-silver, urethane acrylate, epoxy acrylate, acrylate monomers and an auxiliary agent to prepare the nano-silver / carbon nanotube composite conductive ink. According to the preparation method disclosed by the invention, the carbon nanotubes are modified by the nano-silver, so the Van der Waals effect among the carbon nanotubes is reduced, and the agglomeration of the carbon nanotubes is limited; the modified carbon nanotubes play a role in stably dispersing the nano-silver in components, so agglomeration and flocculation of the nano-silver are inhibited; meanwhile, the nano-silver / carbon nanotube composite conductive filler is added, so the conductivity of the ink is improved, and the comprehensive performance of the ink is improved.
Owner:安徽映山红材料科技有限公司
Metal catalyst, preparation method and application
ActiveCN103691434AThe load rate is close to or even fullyAvoid reunionOrganic compound preparationCarbonyl compound preparationCyclohexanoneActive component
The invention relates to a metal catalyst which comprises: 1) a nano TiO2 modified porous material as a composite carrier, and 2) a nano particle of at least one out of Pd and other transition metals as an active component, wherein the active component and TiO2 in the composite carrier have strong metal-carrier interaction to form a Pd@TiO2 structure or a Pd-M@TiO2 structure, thereby forming the Pd-M@TiO2 / porous carrier catalyst, and M is at least one out of the transition metals except Pd. The invention further relates to a preparation method of the catalyst, and an application of the catalyst in preparing cyclohexanone through selective phenol hydrogenation.
Owner:XIANGTAN UNIV
Forming method of metal base carbon nanotube composite material part
ActiveCN108080629ALimit reunionGood dispersionAdditive manufacturing apparatusTransportation and packagingSelective laser meltingOxygen
The invention discloses a forming method of a metal base carbon nanotube composite material part. The forming method comprises the following steps: (1) metal powder and a carbon nanotube are preheatedto obtain a metal base carbon nanotube composite material; (2) program files and SLM equipment are prepared; and (3) when the oxygen volume content of a forming chamber is not more than 0.1%, according to the program files and forming process parameters, selective melting is started for gradual stacking to form the needed part. The forming method uses a selective laser melting technology for layer-by-layer melting to improve dispersibility of the carbon nanotube in a metal matrix; due to high cooling speed, the interface reaction of the carbon nanotube and the metal matrix and the element segregation are reduced; through control of core process parameters, the stability of forming the metal base carbon nanotube composite material is improved; the compactness of the formed material can reach above 99.8%; a complicated part can be directly formed; the production period is shortened; the forming efficiency is improved; and higher production and application value is achieved.
Owner:XIAN BRIGHT ADDTIVE TECH CO LTD
Phosphorus-doped carbon-loaded molybdenum-tungsten carbide catalyst, preparation and application thereof
PendingCN111215104ALarge specific surface areaAperture adjustableCatalyst activation/preparationElectrodesPtru catalystNanoparticle
The invention relates to a preparation method of a phosphorus-doped carbon-loaded molybdenum-tungsten carbide electrochemical hydrogen evolution catalyst, and belongs to the technical field of electrocatalytic materials. According to the invention, MoWCu multi-element metal-based MOF is used as a precursor, and then high-temperature heat treatment is carried out to obtain the catalyst; through nano confinement carbonization of an organic ligand and in-situ conversion of metal center ions, a component-controllable multi-element metal carbide / phosphorus-doped carbon nano composite structure is synthesized, so that an efficient electrochemical hydrogen evolution catalyst is created; the preparation method is simple in process, agglomeration of molybdenum-tungsten carbide nanoparticles is limited to a great extent, repeatability is good, and mass production is easy; and the catalyst shows good performance in an electro-catalytic hydrogen evolution reaction (HER) under an alkaline condition, and has a certain application prospect.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Preparation method of iron carbide composite electrode material coated with nitrogen and sulfur doped with carbon
InactiveCN109728260AChange electronic structureSmall sizeMaterial nanotechnologyCell electrodesThioureaOxygen
The invention discloses a preparation method of an iron carbide composite electrode material coated with nitrogen and sulfur doped with carbon. The method comprises the following steps of: (1) mixingan iron-containing compound, thiourea and glucose, dissolving the mixture into a solvent for stirring and heating until dried powder is obtained; (2) performing heat treatment in an inert atmosphere for cooling to obtain black powder; (3) adding an acid solution for heating and stirring, filtering to remove filter residues to wash until the solvent is neutral, cooling and drying the residue obtained after washing to obtain an iron carbide composite electrode material coated with nitrogen and sulfur doped with carbon. The method is simple in process, greatly limits the agglomeration of the ironcarbide nanoparticles, is easy to control of the synthesis process and low in manufacturing cost, and can be applied to fields of energy storage and conversion research such as lithium ion batteries,electrocatalytic oxygen reduction.
Owner:GUANGXI UNIV
Method for preparing olefin compound based on catalyst obtained by compounding carbon tubes and transition metals
ActiveCN104549293AImprove conversion rateImprove stabilityHydrocarbonsMetal/metal-oxides/metal-hydroxide catalystsDehydrogenationBiological activation
The invention discloses a method for preparing an olefin compound based on a catalyst obtained by compounding carbon tubes and transition metals. The method comprises the following steps: preheating and vaporizing an alkane compound, mixing the compound with carrier gas, and carrying out a dehydrogenation reaction in a reactor under the action of a catalyst; and collecting the olefin compound after condensation, wherein the catalyst contains 5-30wt% of transition metals / transition metal oxides and 70-95wt% of carbon tubes. The method is used for preparing aliphatic olefin compounds and aromatic olefin compounds, the catalyst compounded based on the carbon tubes and transition metal elements / transition metal oxides is stable to water, air and heat, the catalytic activity is invariable after the continuous experiment of over 150 hours, continuous operation can be realized, activation is not needed, and the catalyst is economic and convenient. According to the method disclosed by the invention, when the catalyst is applied to ethylbenzene gaseous phase direct dehydrogenation so as to prepare styrene, the conversion rate of the alkane compound is not less than10 percent, and the selectivity of the olefin compound can be more than or equal to 97 percent.
Owner:ZHEJIANG UNIV
Carbide-loaded noble metal monatomic catalyst and preparation and application thereof
PendingCN114522706AEvenly dispersedRich pore structurePhysical/chemical process catalystsEnergy inputAcid etchingPtru catalyst
The invention relates to a preparation method of a carbide-loaded noble metal monatomic catalyst, and belongs to the technical field of electro-catalytic materials. The technical problems of high preparation cost and low metal utilization rate of a noble metal catalyst for an electrochemical hydrogen production reaction at present are solved. In the synthesis process of a metal organic framework precursor, noble metal ions are introduced to be complexed with heteropolyacid and embedded into an organic framework pore channel in a self-assembly mode, and the precursor is subjected to high-temperature heat treatment and acid etching to obtain the carbide-loaded noble metal monatomic catalyst. The result shows that the loaded noble metal is uniformly dispersed on the carbide nanoparticles in a monatomic form. The catalyst shows good activity in alkaline electrochemical hydrogen evolution reaction. The preparation process of the catalyst is simple and easy to implement, the utilization rate of precious metal is remarkably increased, the cost of the electrocatalyst is effectively reduced, and the catalyst has wide application prospects.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Method for preparing polyurethane-nano silver long-lasting antimicrobial film by modification method after ultraviolet-irradiation
ActiveCN107082905AThe reaction process is simpleAvoid difficult synthesisDimethylformamideLong chain
The invention relates to a method for preparing a polyurethane-nano silver long-lasting antimicrobial film by a modification method after ultraviolet-irradiation. The method comprises the steps: (1) conducting a mixed reaction of diisocyanate and polytetrahydrofuran; adding an acetone solution containing a cross-linking agent and a chain extender, adding dimethylol propionic acid and a catalyst to react, and obtaining PU; adding a dimethylformamide solution of silver nitrate to a polyurethane solution, stirring evenly to form a film, conducting heat treatment, and obtaining a polyurethane-nano silver film; (2) reacting 4,4'-dihydroxybenzophenone with long chain haloalkane, and obtaining 4,4'-double-long chain alkoxy benzophenone; reacting the 4,4'-double-long chain alkoxy benzophenone with hydrazine hydrate, and obtaining 4,4'-double-long chain alkoxy benzophenone hydrazone; conducting oxidizing reaction on the 4,4'-double-long chain alkoxy benzophenone hydrazone, and obtaining long chain alkyl diazomethane; (3 ) dissolving the long-chain alkyl diazomethane in solvent, spraying on the surface of the polyurethane-nano-silver film, after ultraviolet-irradiation, and obtaining the product. The invention can achieve long-term anti-microbial.
Owner:QILU UNIV OF TECH
Method for preparing nanometer silicon carbide at low temperature
ActiveCN109748282ALimit reunionSimple processCatalyst carriersCell electrodesPorosityNano structuring
The invention provides a method for preparing nanometer silicon carbide at a low temperature. The method adopts the 'double confinements' process and comprises the following steps: firstly preparing asilicon dioxide / carbon compound through the pyrolysis of a silicon dioxide / polymer compound; then mechanically mixing the obtained compound with magnesium metal / calcium and performing thermal treatment in a closed reactor; finally sequentially cleaning with hydrochloric acids and hydrofluoric acids to obtain the nano-structured SiC. In a synthetic route, a carbon skeleton in the silicon dioxide / carbon compound provides a first confinement effect to confine the growth of the nanometer silicon carbide, and the closed reactor provides a second confinement effect to reduce the carbothermal reduction temperature. The nanometer silicon carbide prepared by the method has large specific surface area and abundant porosity, can load a metallic silver catalyst as a carrier and is used for a lithiumion battery anode material. The method for preparing the nanometer silicon carbide, provided by the invention, is simple in process and convenient for realization of large-scale production.
Owner:NORTHEASTERN UNIV
PPy/GO composite electrode material and preparation method and application thereof
InactiveCN110436584ASimple methodOperable and repeatableDispersed particle separationWater/sewage treatmentCurrent collectorCapacitive deionization
The invention discloses a PPy / GO composite electrode and a preparation method and application thereof, and belongs to the technical field of capacitive deionization. According to the preparation method of the PPy / GO composite electrode, a foamed nickel substrate is used as a current collector, firstly a pyrrole monomer is dissolvoed in a sodium dodecylbenzenesulfonate (SDBS) solution, then a graphene oxide dispersion solution is added, a mixture is ultrasonically dispersed and fully stirred, a PPy / GO composite coating is formed on the foamed nickel current collector by a one-step anodic electrochemical co-deposition method, and the mixture is washed and dried to prepare the PPy / GO composite electrode. The method for preparing the electrode material is simple, operable and reproducible, andis suitable for mass production. The synergistic action of GO and PPy enables the conductivity of the electrode material to be significantly improved while more adsorption sites are given for the electrode material, and the capacitive properties and absorption and desorption properties of the electrode material are further improved.
Owner:XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
Preparation method for nanoscale base material of crude oil pourpoint depressant
InactiveCN104155205ALimit reunionProne to reunionWeighing by removing componentFlow propertiesX-rayViscosity
The invention discloses a preparation method for a nanoscale base material of a crude oil pourpoint depressant and belongs to a crude oil pourpoint depressant and the technical field of the crude oil pourpoint depressant. In the method, a thermal weight loss test, a crystallization property test, an X-ray diffraction test, a powder particle size test, a water content test and a viscosity test in which a compounding agent formed by the nanoscale base material of the crude oil pourpoint depressant is added into the crude oil are adopted, wherein polar groups are grafted to the surfaces of inorganic nanoparticles; when results of the thermal weight loss test, the crystallization property test, the X-ray diffraction test, the powder particle size test and the water content test are considered to be qualified, the nanoscale base material of the crude oil pourpoint depressant is considered to be qualified. As the nanoscale base material of the crude oil pourpoint depressant is considered to be qualified by testing, the self-aggregation easily generated by the nanoscale base material of the crude oil pourpoint depressant is limited; the originally owned performance can be fully played.
Owner:PETROCHINA CO LTD
Method for preparing Ag-carrying bacterial cellulose hydrogel antimicrobial dressing and product thereof
Owner:DONGHUA UNIV +1
Regeneration method for deactivated transition metal catalyst
InactiveCN109647436AAchieve regenerationSolve the problem of sintering permanent deactivationHydrocarbon from carbon oxidesCatalyst regeneration/reactivationOxygenCarbon deposition
The invention provides a regeneration method for a deactivated transition metal catalyst. The method includes the steps of (1) roasting the deactivated catalyst in an oxygen-containing gas; (2) carrying out purging with a protective gas to replace the oxygen-containing gas; (3) introducing a reducing gas for a reduction reaction to obtain a regenerated catalyst. By adopting the high-temperature solid-phase reaction and controlled reduction strategies, carbon deposition can be eliminated to realize regeneration of the catalyst deactivated by carbon deposition, and meanwhile agglomerated metal nanoparticles can be dispersed again to realize regeneration of the catalyst deactivated by metal sintering. The method is easy and convenient to implement and high in regeneration efficiency, the catalyst can be repeatedly regenerated, the carbon deposition and sintering resistance of the regenerated catalyst is improved, and the service life of the regenerated catalyst is prolonged.
Owner:LANGFANG INST OF PROCESS ENG CAS +1
Preparation method of high-transmission composite Ag film
InactiveCN110835740AImprove thermal stabilityPenetration Threshold LoweredVacuum evaporation coatingSputtering coatingComposite filmRadio frequency magnetron sputtering
The invention provides a preparation method of a high-transmission composite Ag film. The preparation method comprises the following steps that glass base plate pretreatment is carried out; a TiO2 film is prepared, specifically, a radio frequency magnetron sputtering method with the sputtering power of 120W - 140 W is adopted, a deposition chamber is vacuumized, a TiO2 target is adopted, working gas is a mixed gas of oxygen and argon, and annealing is carried out after deposition; a Cr-containing Ag film is prepared, specifically, a pure Ag target embedded with a chromium slice is used, the Cr-containing Ag film is deposited through vacuum magnetron sputtering, the sputtering power is 30W - 50 W, and sputtering gas is argon; and the TiO2 film is prepared again. According to the composite Ag film prepared by the preparation method, a TiO2 / Ag (Cr) / TiO2 multilayer structure has low resistance and high optical transmittance.
Owner:广州市思创信息技术有限公司
Ruthenium and nitrogen co-doped porous carbon catalyst, preparation method thereof and application of ruthenium and nitrogen co-doped porous carbon catalyst in hydrogen evolution by electrolysis
The invention discloses a ruthenium and nitrogen co-doped porous carbon catalyst as well as a preparation method and application thereof in hydrogen evolution by electrolysis. The catalyst is prepared by taking ethylenediamine tetraacetic acid salt as a ligand and a carbon source, preparing a ruthenium complex precursor by combining with ruthenium salt, and then performing high-temperature pyrolysis on the ruthenium complex precursor to obtain a target product. The catalyst provided by the invention has efficient hydrogen evolution activity and lasting stability, and has a wide application prospect.
Owner:HEFEI UNIV OF TECH
Zinc-doped graphene catalyst as well as preparation method and application thereof
ActiveCN111545234AIncrease the gapLimit reunionCatalyst activation/preparationElectrodesDoped graphenePtru catalyst
The invention provides a zinc-doped graphene catalyst, a preparation method thereof and an application of the zinc-doped graphene catalyst in electrochemical nitrogen reduction reaction, and the preparation method comprises the following steps: step 1, adding urea, a zinc source and citric acid into water, stirring for mixing, and drying to obtain a precursor; 2, subjecting the precursor to high-temperature carbonization in an inert atmosphere, dividing high-temperature carbonization into two processes, wherein the carbonization temperature in the first process is 500-600 DEG C, and the carbonization temperature in the second process is 900-1100 DEG C; the preparation method is simple, metal can be loaded on the graphene-like material in the form of single atoms or small clusters, and meanwhile, the prepared catalyst has the performance of efficiently catalyzing nitrogen reduction and good stability.
Owner:XI AN JIAOTONG UNIV
Biomass waste residue-based monatomic metal catalyst as well as preparation method and application thereof
PendingCN114210331AImprove dispersionIncrease profitWater contaminantsCatalyst activation/preparationEnvironmental chemistryOrganosolv
The invention relates to a biomass waste residue-based monatomic metal catalyst and a preparation method and application thereof, the preparation method comprises the following steps: 1) drying, crushing and sieving biomass waste residues to obtain waste residue powder, and then performing oxygen-limited pyrolysis to obtain biomass charcoal; 2) mixing the biomass charcoal with a potassium hydroxide solution, stirring, drying, and carrying out secondary pyrolysis under a limited oxygen condition to obtain porous charcoal; and 3) dissolving the metal precursor and o-phenanthroline in an organic solvent, then adding the porous carbon, stirring, then drying to obtain powder, uniformly mixing the powder with a cyanamide compound, and sintering in a protective atmosphere. Compared with the prior art, the biomass waste residue-based monatomic metal catalyst prepared by taking the porous carbon prepared by pyrolyzing the biomass waste residues as the carrier shows excellent activity and stability, can meet the requirements of application and development in related fields, and particularly has high oxidation activity on organic pollutants.
Owner:SHANGHAI JIAO TONG UNIV
Preparation method of cathode material of lithium ion battery and related product thereof
ActiveCN111549321AKeep dryKeep the surface flatMaterial nanotechnologyVacuum evaporation coatingNanopillarElectrical battery
The invention discloses a preparation method of a cathode material of a lithium ion battery and a related product thereof. The method comprises the steps of selecting a piece of metal foil as a current collector, preprocessing the metal foil, and cleaning the surface of the metal foil; attaching a porous nano template to the surface of the preprocessed metal foil; depositing SnO2 by using a pulsedlaser deposition system; carrying out annealing treatment; and removing the porous nano template to obtain a SnO2 nano pillar array on the metal foil. The method adopts pulsed laser deposition to prepare the cathode material of the lithium ion battery, agglomeration of products can be well limited, introduction of impurities is avoided, and thus the method has the advantages of simple preparationprocess, reliable process and the like; meanwhile, the prepared highly-ordered SnO2 nano pillar array material has the advantages of clear interface, complete structure and the like; and when the prepared material is used as the cathode material of the lithium ion battery, an efficient electron transmission channel can be provided, and most importantly, volume expansion can be effectively relieved in the charging and discharging process, thus the cycle performance of the battery is improved, and the service life of the battery is prolonged.
Owner:XIANGTAN UNIV
Preparation method of expanded graphite cerium oxide or graphene cerium oxide composite material
ActiveCN111689493AObvious advantagesSimple structureCerium oxides/hydroxidesGrapheneCerium nitrateCerous chloride
The invention provides a preparation method of an expanded graphite / cerium oxide or graphene / cerium oxide composite material. The intercalation performance of the graphite is utilized, soluble ceriumchloride or cerium nitrate is inserted into expandable graphite in a solution, the expandable graphite is converted into expanded graphite and the cerium chloride or cerium nitrate is converted into cerium oxide through a high-temperature reaction, and an expanded graphite / cerium oxide composite material is generated in situ through a one-step method so that the expanded graphite and the cerium oxide are uniformly compounded and firmly combined. The graphene / cerium oxide composite material is prepared from the expanded graphite / cerium oxide composite material through ultrasonic stripping, andgraphene and cerium oxide can also achieve a uniform compounding effect. The process is simplified, and the operation is convenient; the preparation of the graphene / cerium oxide composite material from the expanded graphite / cerium oxide composite material is also easy to realize. The method is simple in process, low in equipment requirement and easy to amplify and produce in batches.
Owner:郑州中科新兴产业技术研究院 +1
Synthesis method of M (at) SSZ-13 (at) NanoBeta with core-shell structure
PendingCN114367307ALimit reunionGood dispersionMolecular sieve catalystsMolecular sieve catalystPolycyclic aromatic hydrocarbonPtru catalyst
The invention relates to a preparation method of M (at) SSZ-13 (at) NanoBeta with a core-shell structure, which specifically comprises the following steps: encapsulating noble metal in core layer SSZ-13 zeolite in situ to form a core layer M (at) SSZ-13, taking a part of the core layer sample, putting the core layer sample into Beta synthetic gel, crystallizing to form the core-shell type M (at) SSZ-13 (at) NanoBeta, and performing orifice modification on the SSZ-13 zeolite through the growth of the shell layer NanoBeta zeolite to limit the contact between sulfide and noble metal, so as to obtain the core-shell type M (at) SSZ-13 (at) NanoBeta. The sulfur resistance of the catalyst is improved, the active hydrogen component in the hydrogen overflow effect can perform hydrogenation on the polycyclic aromatic hydrocarbon adsorbed on the acid site of the shell layer, and then the hydrogenation product is further cracked on the NanoBeta zeolite, so that the selective hydrocracking of the polycyclic aromatic hydrocarbon is realized. The core-shell hydrogenation catalyst prepared by the invention has high catalytic activity and good sulfur resistance.
Owner:TAIYUAN UNIV OF TECH
Preparation method for novel Al2O3/ZrO2(Y2O3) complex-phase ceramic
The invention discloses a preparation method for novel Al2O3 / ZrO2(Y2O3) complex-phase ceramic. The preparation method comprises the following steps: firstly, preparing Al2O3 powder into Al2O3 porous ceramic; then, soaking the Al2O3 porous ceramic into a liquid containing Zr<4+> and Y<3+> under a vacuum environment, filling the liquid into holes of the Al2O3 porous ceramic; performing hydrothermal reaction for curing and attaching Zr<4+> and Y<3+> in the liquid to the surfaces of the Al2O3 particles; and finally, drying and burning to obtain the novel Al2O3 / ZrO2(Y2O3) complex-phase ceramic. According to the preparation method disclosed by the invention, ZrO2 and Y2O3 are uniformly dispersed in the complex-phase ceramic, so that agglomeration is avoided, and the action, on improving the mechanical properties of the material, of the second phase is strengthened; and moreover, the preparation process is simple, implantation and popularization are convenient, and large-scale production can be performed on an existing Al2O3 ceramic production line.
Owner:江苏省陶瓷研究所有限公司
Defect type TNTs composite material capable of achieving magnetic separation and preparation method thereof
PendingCN110116002AImprove stabilityLimit reunionWater/sewage treatment by irradiationWater treatment compoundsIron saltsWater soluble
The invention discloses a defect type TNTs composite material capable of achieving magnetic separation and a preparation method thereof. P25, a water-soluble divalent iron salt and a trivalent ferriciron salt are used as raw materials, and Fe3O4 nanoparticles grow in situ on TiO2 nanotubes (TNTs) under an alkaline hydrothermal condition to synthesize the defect type TNTs composite material capable of achieving magnetic separation. The prepared Fe3O4-TNTs nanocomposite material capable of achieving magnetic separation has a good magnetic property, the saturation magnetization strength is 22.60emu / g, and the separation and recovery of the composite material can be achieved; when illumination is carried out for 120 minutes, the removal rate of methylene blue by the magnetic Fe3O4-TNTs nanocomposite material is 99.67%, and the prepared defect type TNTs composite material capable of achieving magnetic separation has excellent adsorption performance, photocatalytic activity and magnetism and can be separated and recovered through an externally applied magnetic field.
Owner:NORTHWEST UNIVERSITY FOR NATIONALITIES
A kind of method for preparing nano-silicon carbide at low temperature
ActiveCN109748282BLimit reunionSimple processCatalyst carriersCell electrodesCarbon compositesPtru catalyst
The present invention proposes a method for preparing nano-silicon carbide at low temperature. The method adopts a "double confinement" process, first preparing a silica / carbon compound by pyrolyzing the compound of silica / polymer, and then obtaining The complex is mechanically mixed with metal magnesium or calcium, heat-treated in a closed reactor, and finally, washed sequentially with hydrochloric acid and hydrofluoric acid to obtain nanostructured SiC. In this synthetic route, the carbon skeleton in the silica / carbon composite provides the first confinement effect to limit the growth of nano-SiC, while the closed reactor provides the second confinement effect to reduce the temperature of carbothermal reduction. The nano-silicon carbide prepared by the method has a large specific surface area and abundant pores, and can be used as a carrier to load a metal silver catalyst and be used as a negative electrode material of a lithium-ion battery. The method for preparing nano-silicon carbide provided by the invention has a simple process and is convenient for realizing large-scale production.
Owner:NORTHEASTERN UNIV LIAONING
A kind of preparation method of oxide nanopowder
InactiveCN101671000BEasy to controlLimit reunionNanostructure manufactureAir atmospherePowder method
Owner:DONGHUA UNIV
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