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46results about How to "High reproducibility of preparation" patented technology
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Miniature optical elements for fiber-optic beam shaping
ActiveUS8582934B2Prevent disruption and damageHigh reproducibility of preparationMirrorsEndoscopesFiberOptical radiation
In part, the invention relates to optical caps having at least one lensed surface configured to redirect and focus light outside of the cap. The cap is placed over an optical fiber. Optical radiation travels through the fiber and interacts with the optical surface or optical surfaces of the cap, resulting in a beam that is either focused at a distance outside of the cap or substantially collimated. The optical elements such as the elongate caps described herein can be used with various data collection modalities such optical coherence tomography. In part, the invention relates to a lens assembly that includes a micro-lens; a beam director in optical communication with the micro-lens; and a substantially transparent film or cover. The substantially transparent film is capable of bi-directionally transmitting light, and generating a controlled amount of backscatter. The film can surround a portion of the beam director.
Owner:LIGHTLAB IMAGING
Doped multi-layer core-shell silicon-based composite material for lithium ion battery and preparation method thereof
ActiveCN109599551AInhibits and buffers swellingPrevent partial failureMaterial nanotechnologySecondary cellsCarbon filmComposite film
The present invention relates to a doped multi-layer core-shell silicon-based composite material for a lithium ion battery, and a preparation method thereof. Other than being doped with a necessary lithium element, the material is also doped with at least a non-metallic element and a metal element; the material has a structure in which a silicon oxide particle doped with elements is taken as a core, and a multilayer composite film which is tightly coated on the surface of the core particle is taken as a shell; the core particle contains uniformly dispersed monoplasmatic silicon nanoparticles,the content of doping elements gradually decreases from the outside to the inside without a clear interface, and a dense lithium silicate compound is formed on the surface of the core particle by embedding and doping the lithium element; and the multilayer composite film is a carbon film layer and a doped composite film layer composed of the carbon film layer and other elemental components. The doped multi-layer core-shell silicon-based composite material provided by the present invention has a high capacity, good rate performance, high coulombic efficiency, good cycle performance, a low expansion rate, and other electrochemical characteristics when the material is used for the negative electrode of lithium ion battery.
Owner:BERZELIUS (NANJING) CO LTD +1
Method for growing large-area graphene on insulating substrate
The invention discloses a method for growing large-area graphene on an insulating substrate. According to the method, a growing substrate is taken as an insulating material, a copper foil is taken as a catalyst and a carbon source, nitrogen and protective gas are taken as source gases, and the large-area graphene is grown on the insulating substrate by adopting a two-step (low-pressure growth and high-pressure growth) chemical vapor deposition method and using the short-range catalytic effect of the copper coil through face-to-face contact of the insulating substrate and the copper foil. The method disclosed by the invention is simple in operation of the whole process and low in cost; and the sample preparation is very high in repeatability and is less interfered by external world. The prepared single-layer graphene can be made into a large-area circuit device by using an exposure method without needing a complex transfer technology.
Owner:PEKING UNIV
Single crystal silicon ingot and wafer, and apparatus and method for growing said ingot
InactiveUS20150147258A1Precise controlIncrease marginPolycrystalline material growthSiliconMonocrystalline siliconDefect region
The single crystal silicon ingot and wafer of one embodiment has a transition region formed therein which predominantly has crystal defects of 10 nm to 30 nm in size from among crystal defects included in at least one region of a vacancy predominant non-defective region and an interstitial predominant non-defective region.
Owner:LG SILTRON
Rapid preparation method of monoclinic phase VO2 metal-insulator phase transformation ceramic material
InactiveCN106083044AHas a single-phase structureEnrich physical property transformationMetal insulatorCeramic
The invention relates to a rapid preparation method of a monoclinic phase VO2 metal-insulator phase transformation ceramic material. The method comprises the following steps: reducing V2O5 with citric acid by a hydrothermal method, carrying out centrifugal cleaning to obtain an orthorhombic phase VO2 nanopowder, carrying out high-temperature heat treatment to obtain a monoclinic phase VO2 powder, and finally compressing and sintering to obtain the monoclinic phase VO2 metal-insulator phase transformation ceramic. The process is simple; preparation efficiency is high; sintering temperature is low; energy consumption is low; cost is low; the method is environment friendly, nontoxic and pollution-free; and the prepared ceramic has good phase transformation property and stable and uniform structure.
Owner:HUAZHONG UNIV OF SCI & TECH
3D-TSV (Through Silicon Via) in-situ tension test sample and preparation method thereof
InactiveCN104198272AAvoid incompatibilitiesAvoid errorsPreparing sample for investigationStrength propertiesTest samplePhotoresist
The invention provides a 3D-TSV (Through Silicon Via) in-situ tension test sample and a preparation method thereof. The test sample comprises a test sample column part, fixing parts and clamping parts, wherein a test sample column is prepared from a dry film as a substitute for positive photoresist, so as to be convenient for growth of a metal column; the fixing parts are electroplated together with the test sample column part and respectively serve as a port for connecting the test sample column part with external, so that the problem that the test sample column is difficult to operate due to small size is solved. In order to facilitate the clamping operation of a test instrument, the clamping parts are prepared via an electroplating, adhesion or welding process; according to the electroplating process, a layer of strip-shaped metal is directly shaped in each a fixing end, the two ends of each strip-shaped metal are provided with rings and each metal is folded to align the rings so as to obtain one clamping part; according to the adhesion or welding process, each clamping part is directly connected with one fixing end by adhesion or welding. In design, the test sample and the method are convenient to operate in whole, the steps are simple and the technology is optimized on the basis of ensuring the accuracy.
Owner:SHANGHAI JIAO TONG UNIV
Photo-thermal catalytic hydrogenation catalyst as well as preparation and application thereof to selective hydrogenation reaction of p-benzoquinone
ActiveCN109046334APrecise and controllable particle size distribution rangeMild process conditionsMaterial nanotechnologyOrganic chemistryChemistryHydroquinone Compound
The invention discloses a photo-thermal catalytic hydrogenation catalyst as well as preparation and application thereof to selective hydrogenation reaction of p-benzoquinone. The photo-thermal catalytic hydrogenation catalyst is prepared from a mesoporous carbon microsphere carrier, and carbon quantum dots and metal quantum dots which are loaded on the surface of the carrier; the size of the catalyst is 50 to 100nm; the grain diameter range of the carbon quantum dots is 7 to 9.5nm; the metal quantum dots are one or a combination of two of palladium quantum dots and platinum quantum dots; the grain diameter range of the metal quantum dots is 10 to 15nm; in the catalyst, the mass percent of the carbon quantum dots and the metal quantum dots is 10 to 30 percent and 1 to 2 percent respectively. The photo-thermal catalytic hydrogenation catalyst provided by the invention is applied to reaction of selectively carrying out catalytic hydrogenation on the p-benzoquinone under the irradiation ofultraviolet light with the wavelength of 350 to 400nm to synthesize hydroquinone, and has the characteristics of high conversion rate, good selectivity, rapid hydrogenation reaction speed and good stability.
Owner:ZHEJIANG UNIV OF TECH
Preparation method of catalyst for butylene oxidative dehydrogenation to produce butadiene
ActiveCN104226351AEasy active site performanceChange active site performancePhysical/chemical process catalystsHydrocarbonsButadiene DioxideDehydrogenation
The invention relates to a preparation method of a catalyst for butylene oxidative dehydrogenation to produce butadiene, and mainly solves the problems of easy loss of components in precipitation process and poor reproducibility in the existing preparation of the catalyst. The invention adopts ball milling method to grind iron oxide, magnesium oxide, zinc oxide and a catalytic promoter in the form of oxides into powder, so as to obtain a mixture of complex metal oxides, the mixture is subjected to high-temperature calcination to obtain butylene, and butylene is subjected to oxidative dehydrogenation to obtain butadiene. The technical scheme well solves the problem, and can be used in industrial production of butadiene from butylene oxidative dehydrogenation.
Owner:CHINA PETROLEUM & CHEM CORP +1
Carbide emitter mask etch stop
InactiveUS7034379B2Easy to controlImproved device matchingTransistorSolid-state devicesDielectricCarbide
Bipolar transistors and methods for fabricating bipolar transistors are disclosed wherein an emitter-base dielectric stack is formed between emitter and base structures, comprising a carbide layer situated between first and second oxide layers. The carbide layer provides an etch stop for etching the overlying oxide layer, and the underlying oxide layer provides an etch stop for etching the carbide layer to form an emitter-base contact opening.
Owner:INTEL CORP
Photo-thermal catalytic hydrogenation catalyst as well as preparation and application thereof to selective hydrogenation reaction of 3,4-dichloronitrobenzene
ActiveCN109046328AGood dispersionIncrease profitOrganic compound preparationAmino compound preparationMicrosphereUltraviolet lights
The invention discloses a photo-thermal catalytic hydrogenation catalyst as well as preparation and application thereof to selective hydrogenation reaction of 3,4-dichloronitrobenzene. The photo-thermal catalytic hydrogenation catalyst is prepared from a mesoporous carbon microsphere carrier, and carbon quantum dots and metal quantum dots which are loaded on the surface of the carrier; the size ofthe catalyst is 50 to 100nm; the grain diameter range of the carbon quantum dots is 4.5 to 6.5nm; the metal quantum dots are one or a combination of two of palladium quantum dots and platinum quantumdots; the grain diameter range of the metal quantum dots is 10 to 15nm; in the catalyst, the mass percent of the carbon quantum dots and the metal quantum dots is 10 to 30 percent and 1 to 2 percentrespectively. The photo-thermal catalytic hydrogenation catalyst provided by the invention is applied to reaction of selectively carrying out catalytic hydrogenation on the 3,4-dichloronitrobenzene under the irradiation of ultraviolet light with the wavelength of 280 to 350nm to synthesize 3,4-dichloroaniline, and has the characteristics of high conversion rate, good selectivity, rapid hydrogenation reaction speed and good stability.
Owner:ZHEJIANG UNIV OF TECH
Copper nanoparticle cluster loaded electrochemical sensor and preparation method thereof
InactiveCN105891291AImprove electrocatalytic activityGood film formingMaterial electrochemical variablesBenzimidazoleNanometre
The invention discloses a copper nanoparticle cluster loaded electrochemical sensor and a preparation method thereof. The sensor mainly comprises a glassy carbon electrode, an SPAEK-6F-BI (sulfonated polyaryletherketone-6F-benzimidazole) polymer thin-layer template precursor and carrier film adopting a hexafluorobisphenol A and benzimidazole structure and a copper nanoparticle cluster loaded high-electrocatalytic-activity film. The electrochemical sensor provided with a copper nano particle cluster modified electrode and prepared with the method having all mentioned advantages and effects has a remarkably enhanced electro-catalytic reduction effect on H2O2, and the sensor manufacturing repeatability is high; when the electrochemical sensor is used for H2O2 electrochemical analysis, the response sensitivity is high, the test stability and repeatability are good, and the electrochemical sensor can be used for quickly and accurately analyzing the content of low-concentration H2O2.
Owner:ZHEJIANG UNIV
Pulse modulator for nonradiative dielectric waveguide, and millimeter wave transmitter/receiver using the same
InactiveUS7068118B2High reproducibility of preparationImproving Impedance MatchingMultiple-port networksSubstation equipmentPhysicsElectric field
A pulse modulator includes a circulator which comprises: two ferrite plates; a plurality of mode suppressors for transmitting therethrough an LSM mode electromagnetic wave while shutting off an LSE mode electromagnetic wave; and an impedance matching member mounted on one end face of each of the mode suppressors, wherein a pulse modulation switch having a Schottky barrier diode is mounted on the other end face of any one of the mode suppressors in such a manner that the direction of application of a bias voltage to the Schottky barrier diode coincides with the direction of electric field of the LSM mode electromagnetic wave, and wherein the distance from an edge of the ferrite plates to the Schottky barrier diode is set approximately equal to nλ / 2. Herein, n is an integer not smaller than 1, and λ is the wavelength of the high frequency signal.
Owner:KYOCERA CORP
External nano-hydroxyapatite/polydopamine wet adhesion type styptic powder and preparation method thereof
InactiveCN111450306AExcellent biocompatibilityEasy to useSurgical adhesivesPharmaceutical delivery mechanismChemistryHEMOSTATIC POWDER
The invention discloses external nano-hydroxyapatite / polydopamine wet adhesion type styptic powder and a preparation method thereof. The styptic powder is nano-hydroxyapatite loaded with polydopamine.The preparation method comprises the following steps: adding nano-hydroxyapatite and dopamine into a weakly alkaline solution, and reacting at room temperature; and carrying out freeze drying on theproduct to obtain the nano-hydroxyapatite / polydopamine needle-like composite styptic powder. The material has a multifunctional hydroxyapatite and polydopamine structure, and can be further modified with many substrates. The material can be applied to hemostasis in different forms in different dosage forms, can be prepared into emergency lifesaving powder, hemostasis hydrogel, self-adhesive dressing, hemostasis antibacterial sponge and the like by being integrated with other medical materials and medical instruments, and the novel drug delivery carrier can be prepared by doping or crosslinkingantibacterial, wound healing promoting and pain relieving drugs and nano-hydroxyapatite or reacting the drugs with polydopamine, and multifunctional integration of the hemostatic material is realized.
Owner:DALIAN UNIV OF TECH
Wide-spectrum extremely-low transmission structure and preparation process thereof
InactiveCN111003685AOptimizing Material SelectionConvenient heightDecorative surface effectsChemical vapor deposition coatingMaterials sciencePhotochemistry
The invention discloses a wide-spectrum extremely-low transmission structure and a preparation method thereof. The wide-spectrum extremely-low transmission structure comprises a substrate, and furthercomprises a nano forest structure directly formed on at least one surface of the substrate, and metal nano particles loaded on the nano forest structure; when only one surface of the substrate is ofa nano forest structure, a metal layer is arranged on the other surface, opposite to the nano forest structure, of the substrate. The structure provided by the invention has the advantages of high stability and high light absorption capability.
Owner:JIANGSU HINOVAIC TECH CO LTD
High-strength and high-efficiency bismuth telluride block and preparation method and application thereof
PendingCN113328031AHigh thermoelectric figure of meritImprove uniformityThermoelectric device manufacture/treatmentThermoelectric device junction materialsBismuth tellurideThermal deformation
The invention discloses a high-strength and high-efficiency bismuth telluride block. The bismuth telluride block is in a lamellar shape; the bismuth telluride block is a P-type lamellar bismuth telluride block of Bi0.5Sb1.5Te3+x, and the value range of x is 0-0.05, or, the bismuth telluride block is an N-type lamellar bismuth telluride block of Bi2Te3-ySey, and y ranges from 0 to 0.3. The bismuth telluride block is of a special lamellar structure and has the double characteristics of high orientation degree and grain refinement, and the bismuth telluride block can be directly used for vacuum hot pressing sintering or vacuum thermal deformation sintering without being cut and / or ground into powder. And the bismuth telluride-based thermoelectric material with high thermoelectric figure of merit and high strength can be rapidly prepared.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Carbon-coated mesoporous transition metal sulfide negative electrode material as well as preparation method and application thereof
InactiveCN112768656AStable structureElectrochemical stabilityCell electrodesSecondary cellsPyrrolidinonesMetallic sulfide
The invention provides a carbon-coated mesoporous transition metal sulfide negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps of: mixing polyvinylpyrrolidone, a transition metal salt solution and a sulfur source, and performing heating until the reaction is finished to obtain a transition metal sulfide-containing solution; uniformly mixing the transition metal sulfide-containing solution with a carbon source, and performing a reaction to obtain a coke-coated transition metal sulfide; centrifuging the coke-coated transition metal sulfide, preforming cleaning, and drying to obtain solid transition metal sulfide powder; and calcining the solid transition metal sulfide powder in an inert atmosphere to obtain the carbon-coated mesoporous transition metal sulfide negative electrode material. The negative electrode material is formed by stacking a plurality of nanoscale primary particles, each primary particle is composed of an inner transition metal sulfide and an amorphous carbon coating layer coating the surface of the transition metal sulfide, and a mesoporous structure is formed among the primary particles. The material has high structural stability; and the preparation method is simple.
Owner:KUNMING UNIV OF SCI & TECH
Method for regulating and controlling interaction between metal nanoparticles and carrier by plasma
ActiveCN112275284AHigh reproducibility of preparationEasy to makeHydrogenHydrocarbon by hydrogenationNano catalystPtru catalyst
The invention discloses a method for regulating and controlling interaction between metal nanoparticles and a carrier by plasma, which comprises the following steps: S1, loading a metal precursor on the carrier by adopting an impregnation method or a deposition-precipitation method, and cleaning and drying to obtain a catalyst; s2, putting the obtained catalyst into a plasma generating device, andpretreating the catalyst by adopting plasma in a reducing atmosphere; s3, in an oxidizing atmosphere, activating the catalyst by adopting plasma; and S4, after activation treatment, treating the catalyst by adopting plasma in a reducing atmosphere to obtain the supported metal catalyst. According to the method disclosed by the invention, the supported catalyst is pretreated, activated and retreated in sequence by utilizing plasmas generated by discharging in different atmospheres, so that the interaction between the metal nanoparticles and the carrier is effectively modulated, and the stability of the nano-catalyst is remarkably enhanced while the sizes of the metal nanoparticles are controlled.
Owner:DALIAN MARITIME UNIVERSITY
Preparation method for concentrating pure silicon molecular sieve film with ethanol as fuel
InactiveCN102210983AGood repeatabilityReduce manufacturing costSemi-permeable membranesLiquid carbonaceous fuelsCooking & bakingSilicon dioxide
The invention provides a preparation method for concentrating a pure silicon molecular sieve film with ethanol as a fuel o and relates to a preparation method of a molecular sieve film. The preparation method comprises the following steps of: polishing and leveling a porous silicon dioxide ceramic tube carrier with sand paper, then washing in distilled water with ultrasonic waves, and weighing NaOH, tetrapropylammonium bromide (TPABr) and silica sol to prepare a synthetic solution; fixing the filled porous silicon dioxide ceramic tube with a polytetrafluoroethylene bracket, adding the synthetic solution, aging the synthetic solution in a baking box, crystallizing the synthetic solution at 180 DEG C, taking out, naturally cooling to room temperature, and washing to reach neutrality with the distilled water; and activating the dried molecular sieve film at the temperature of 400-600 DEG C so as to remove a template agent in a molecular sieve pore channel. According to the method, the performance of the synthesized silicalite-1 molecular sieve film and the preparation repeatability can be remarkably improved, the utilization rate of raw materials is enhanced; and the method is beneficial to reduction of the cost and is suitable for industrial magnification.
Owner:SHENYANG UNIV
Magnesium-doped cobalt disulfide composite carbon nanotube material, preparation method and application thereof
ActiveCN111744502AHigh reproducibility of preparationLow preparative reproducibilityCell electrodesCatalyst activation/preparationPtru catalystCarbon nanotube
The invention discloses a magnesium-doped cobalt disulfide composite carbon nanotube material, a preparation method and application of the magnesium-doped cobalt disulfide composite carbon nanotube material in preparation of a zinc-air battery cathode catalyst. According to the preparation method, a zinc-air battery cathode catalyst with oxygen reduction and oxygen evolution reactions is preparedby adopting a hydrothermal method, namely magnesium nitrate is used as a doping agent, cobalt acetate is used as a cobalt-based metal sulfide raw material, sulfur powder is used as a vulcanizing agent, and the metal sulfide and carbon nanotubes are compounded at a high temperature in an inert atmosphere. According to the method, under the combination effect of metals and the carbon material, on the one hand, agglomeration of cobalt can be effectively inhibited, on the other hand, oxygen holes with efficient catalytic oxygen reduction and cobalt disulfide particles with oxygen evolution activity are synchronously generated on the carbon nanotubes, and the finally obtained catalyst material can be used for zinc-air batteries to realize long-time and high-stability charge-discharge circulation.
Owner:DONGHUA UNIV
Method for preparing silver plating PEEK tube for in-tube solid phase microextraction
InactiveCN104451620AFirmly connectedLow priceLiquid/solution decomposition chemical coatingSolid solvent extractionChemical platingSilver plate
The invention discloses a method for preparing a silver plating PEEK tube for in-tube solid phase microextraction, and in particular relates to modification of a silver plating layer with a micrometer structure to the inner wall of the PEEK tube by utilizing chemical silver plating reaction. The new method is characterized in that the PEEK tube which is low in cost, easily available and high in mechanical strength and is conveniently connected with a high performance liquid chromatograph is used as a carrier, the silver plating layer serving as an extraction coating is prepared on the inner wall of the PEEK tube by utilizing a chemical plating method having the advantages of compactness, uniform thickness, high stability and the like of the plating layer. An in-tube solid phase microextraction coating material prepared by the method has the advantages of high selectivity, stable extraction performance, strong enrichment capacity, long service life, simplicity and convenience in preparation method, low cost and the like, can be used for performing on-line enrichment analysis on trace target analytes in samples such as food, environment, medicines, biochemistry and the like under the combination of a liquid chromatogram process, and is high in utilization potentiality.
Owner:UNIV OF JINAN
Controllable synthesis method of all-silicon and high-silicon CHA molecular sieve membrane
ActiveCN111530302AEasy to synthesizeReduce consumptionSemi-permeable membranesProductsMolecular sieveHexafluorosilicic acid
The invention relates to a controllable synthesis method of an all-silicon and high-silicon CHA molecular sieve membrane. The method comprises the following steps: taking N, N, N-trimethyl-1-adamantylammonium hydroxide (TMAdaOH) as a template agent, taking ammonium hexafluorosilicate, or a common silicon source and fluoride as silicon sources, and synthesizing the all-silicon and high-silicon CHAmolecular sieve membrane in a dilute solution with H2O / SiO2 of about 30. Meanwhile, an atomic economic synthesis method is developed and is also called sol-free synthesis, so that the use of a largeamount of mother liquor in traditional hydrothermal synthesis is avoided, the utilization rate of raw materials is greatly increased, and the cost for preparing the membrane is reduced. The thicknessof the prepared all-silicon and high-silicon CHA molecular sieve membrane is less than 1 micron, and the all-silicon and high-silicon CHA molecular sieve membrane has excellent CO2-CH4 separation performances.
Owner:SHANGHAI UNIV OF ENG SCI
Microporous membrane material preparation method, microporous membrane material and application thereof
ActiveCN110055567AAccurate and controllable sizePrecise and controllable shapeElectrolytic inorganic material coatingElectroforming processesSolar cellLithium-ion battery
The invention relates to the technical field of microporous membrane materials, and discloses a microporous membrane material preparation method, a microporous membrane material and application thereof. The method comprises the steps of (1) forming a non-conductive microarray on an electrode and using the non-conductive microarray as a mold plate; (2) placing the mold plate in electrolyte for electrodeposition, and forming a film-like deposition layer on an area, without the microarray, on the electrode; and (3) stripping the film-like deposition layer. The method is high in efficiency, simpleand controllable in large area; the membrane material with a special complicated pore structure and the adjustable size and shape can be prepared; the advantages that the edges of pores are neat, thepreparation repeatability is high, the mechanical and electrical properties are stable, and the relative density is low are achieved, the preparation method is wide in application face, and the microporous membrane material prepared by the method can be used in the fields of lithium ion batteries, oil-water separation, chemical biosensors, solar cells and supercapacitors.
Owner:JIUJIANG TELFORD ELECTRONICS MATERIAL CO LTD
Graphene oxide-based chiral nano composite material and preparation method thereof
ActiveCN111735897AImprove efficiencySimple and fast operationComponent separationEnantiomerPerylene derivatives
The invention provides a graphene oxide-based nano composite material for amino acid enantiomer separation analysis and a preparation method thereof. The method comprises the steps of: dispersing an L-amino acid derivative gelator into a metal ion solution, and heating and cooling to obtain composite hydrogel; dropwise adding a graphene oxide solution into the composite hydrogel, oscillating and uniformly mixing, and standing for layering at room temperature;and performing filtration to obtain products. The method provided by the invention solves the problems of low separation efficiency, complex operation, difficult recycling and low repeatable utilization rate in the existing enantiomer separation process. The composite material disclosed by the invention can realize chiral conversion under the regulation and control of metal ions, and adsorption of different types of amino acid enantiomers is realized according to different chiral structures, so that effective separation is realized. The solid composite material is easy to recycle, can be repeatedly used, is convenient to operate and has practical application value. The preparation method of the material does not need complex synthesis steps, and is suitable for commercial application of enantiomer chiral separation analysis.
Owner:SHANGHAI JIAO TONG UNIV
Photo-thermal catalytic hydrogenation catalyst as well as preparation method and application thereof
ActiveCN109046332AGood dispersionIncrease profitPreparation by hydrogenationMetal/metal-oxides/metal-hydroxide catalystsPlatinumPtru catalyst
The invention discloses a photo-thermal catalytic hydrogenation catalyst as well as a preparation method and application thereof. The photo-thermal catalytic hydrogenation catalyst is prepared from amesoporous carbon microsphere carrier, and carbon quantum dots and metal quantum dots which are loaded on the surface of the carrier; the size of the catalyst is 50 to 100nm; the grain diameter rangeof the carbon quantum dots is 1 to 4nm; the metal quantum dots are one or a combination of two of palladium quantum dots and platinum quantum dots; the grain diameter range of the metal quantum dots is 10 to 15nm; in the catalyst, the mass percent of the carbon quantum dots and the metal quantum dots is 10 to 30 percent and 1 to 2 percent respectively. The photo-thermal catalytic hydrogenation catalyst provided by the invention is applied to reaction of selectively carrying out catalytic hydrogenation on hydroquinone under the irradiation of ultraviolet light with the wavelength of 200 to 280nm to synthesize 1,4-cyclohexanediol, and has the characteristics of high conversion rate, good selectivity and good stability.
Owner:ZHEJIANG UNIV OF TECH
Self-optimizing alloy catalyst as well as preparation method and application thereof
ActiveCN111905756AReduce replacement frequencyImprove stabilityMetal/metal-oxides/metal-hydroxide catalystsElectrodesPtru catalystAlloy catalyst
The invention belongs to the field of alloy catalysts, and particularly discloses a self-optimizating alloy catalyst and a preparation method and application thereof. The preparation method comprisesthe following steps that (1) Ag elementary substance, Cu elementary substance and Al elementary substance are subjected to vacuum melting, AgXCuYAlZ alloy is prepared, wherein X+Y+Z = 100 and the ratio of X to Y to Z is (15-30):(0.1-1):(69-84.9); (2) the alloy is subjected to melt-spinning to preapre an alloy strip; (3) the aluminum is removed from the alloy strip by using acid to obtain an initial catalyst; (4) electrochemical treatment then is carried out on the initial-state catalyst to segregate Cu on the Ag surface, thereby obtaining the catalyst. The alloy catalyst prepared by the invention is a catalytic material with a self-optimizing function, is stable in catalytic performance, is high in current density and catalytic efficiency after being optimized, is suitable for mass production, and is beneficial to industrial application.
Owner:HUAZHONG UNIV OF SCI & TECH
Photoelectrochemical sensor preparation method based on efficient and stable in-situ growth of titanium dioxide/nanogold photo-anode
PendingCN111796012AHigh reproducibility of preparationGood storage stabilityMicrobiological testing/measurementMaterial analysis by electric/magnetic meansIndiumPhotochemistry
The invention discloses a photoelectrochemical sensor preparation method based on efficient and stable in-situ growth of a titanium dioxide / nanogold photo-anode. The preparation method comprises the following steps: cleaning ITO (indium tin oxide) slices of an indium tin oxide electrode; sequentially putting the ITO slices into acetone, ethanol and an ultrapure water solution for ultrasonic treatment; wiping with an ethanol cotton ball, washing with ultrapure water, annealing in a culture dish with one side of ITO upward, taking out the ITO slices, and carrying out plasma and ozone treatment;spin-coating a tetraisopropyl titanate, butyl titanate or ethyl titanate precursor on the treated ITO slices, and then annealing a spin-coated ITO substrate to obtain an ITO / TiO2 electrode; and cooling the ITO / TiO2 electrode to room temperature, and carrying out in-situ gold nanoparticle loading to obtain an ITO / TiO2 / Au NPs photo-anode. The photoelectrochemical sensor has the advantages of being efficient, uniform, stable, high in preparation repeatability, simple in structure, good in storage stability, good in detection repeatability, sensitive to miRNA-21, specific to miRNA-21 and the like,and is used for detecting miRNA.
Owner:NANJING UNIV OF POSTS & TELECOMM
Nano-hydroxyapatite/polydopamine wet-adhesive hemostatic powder for external use and preparation method thereof
InactiveCN111450306BFast adhesionQuick activationSurgical adhesivesPharmaceutical delivery mechanismHEMOSTATIC POWDERAdhesive
The invention discloses a nano-hydroxyapatite / polydopamine wet-adhesive hemostatic powder for external use and a preparation method thereof. The hemostatic powder is nano-hydroxyapatite loaded with polydopamine. The preparation method is as follows: adding nanometer hydroxyapatite and dopamine into weak alkaline solution, reacting at room temperature; freeze-drying the product, and preparing nanometer hydroxyapatite / polydopamine needle-shaped composite hemostatic powder. The material has a multifunctional structure of hydroxyapatite and polydopamine, which can be further modified with many substrates. The material can be applied to different forms of hemostasis in different dosage forms, and combined with other medical materials and medical devices, it can be made into emergency life-saving powder, hemostatic hydrogel, self-adhesive dressing, hemostatic antibacterial sponge, etc. Wound healing, pain relief drugs are doped or cross-linked with nano-hydroxyapatite, or these drugs are reacted with polydopamine to prepare new drug delivery carriers and realize the multifunctional integration of hemostatic materials.
Owner:DALIAN UNIV OF TECH
A doped multilayer core-shell silicon-based composite material for lithium-ion batteries and its preparation method
ActiveCN109599551BInhibits and buffers swellingPrevent partial failureMaterial nanotechnologyNegative electrodesCarbon filmSilicon oxygen
The invention relates to a doped multilayer core-shell silicon-based composite material for lithium-ion batteries and a preparation method thereof. The material is doped with at least one non-metallic element and a A metal element, the structure of which is to use element-doped silicon-oxygen compound particles as the core, and a multilayer composite film tightly coated on the surface of the core particle as the shell; the core particle contains uniformly dispersed elemental silicon nanoparticles, wherein The content of doping elements gradually decreases from the outside to the inside and there is no obvious interface. At the same time, the surface of the inner core particles forms a dense lithium silicate compound due to the doping of lithium elements; the multilayer composite film is a carbon film layer and is composed of A doped composite film layer composed of carbon film layer and other element components. When used in the negative electrode of lithium-ion batteries, it has electrochemical characteristics such as high capacity, good rate performance, high Coulombic efficiency, good cycle performance, and low expansion rate.
Owner:BERZELIUS (NANJING) CO LTD +1
Electrodeposition preparation method of microporous membrane material, microporous membrane material and application thereof
ActiveCN110055567BNeat edgesHigh reproducibility of preparationElectrolytic inorganic material coatingElectroforming processesElectrolytic agentElectrical battery
Owner:JIUJIANG TELFORD ELECTRONICS MATERIAL CO LTD
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