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32 results about "Catalytic sensor" patented technology
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Flexible conductive MXene-based foam and preparation method thereof
The invention discloses flexible conductive MXene-based foam and a preparation method thereof, wherein the flexible conductive MXene-based foam is formed by compounding a two-dimensional metal carbon / nitride nanosheet (MXene) and flexible non-conductive polymer foam. The preparation process mainly comprises preparation of a high-conductivity MXene nano-sheet dispersion liquid and construction of MXene-based composite foam, wherein the MXene-based composite foam perfectly integrates high conductivity and hydrophilicity of MXene and flexibility of polymer foam, so that the MXene-based compositefoam has the characteristics of high flexibility, hydrophilicity and high conductivity. The method is simple and easy to implement, the problem of MXene-based foam construction is effectively solved,and the obtained three-dimensional MXene-based foam material has excellent physical, chemical and mechanical properties and has huge application prospects in the fields of catalysis, sensors, photothermal conversion, electromagnetic shielding, composite materials, electrochemical energy storage and the like.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Multilayered gas sensor
InactiveUS6070450AImprove gas selectivityGood choiceAnalysing fluids using sonic/ultrasonic/infrasonic wavesUsing mechanical meansGas phaseProduct gas
The present invention provides a gas sensor element having physical, electrical and chemical properties capable of detecting methane and carbon monoxide selectively with 1 intergrated filtering, catalyzing sensor by improving gas selectivity of the semiconductor gas sensor. The present invention relates to a gas sensor element, which has a carbon monoxide sensor layer with an ability to function as a catalyst film that blocks carbon monoxide, which impedes detection of methane, and has a layer-built structure where the surface of a methane sensor is covered with the carbon monoxide gas sensor which can be obtained by a gas-phase method.
Owner:NAT INST OF ADVANCED IND SCI & TECH
Preparation of multicomponent nano material by ultrasonic spray technology
InactiveCN1663660AUniform sizeGranulation by liquid drop formationEvaporation by sprayingSolventSpray pyrolysis
The invention relates to plural groups of nanometer materials for ultrasonic spraying technology preparation, which belongs to a new-type material. The invention makes use of the well-proportioned fogdrops of the ultrasonic spraying technology to make the grains of creature consistent. And meanwhile, add unit metal salt and plural metal salt in the reaction agent of the ultrasonic spray and the proportion added can be adjusted. The metal salts appended do not take mutually chemical reaction. Through the adjustment of the prescription of the reaction agent of the ultrasonic spray and the improvement of the spray pyrogenation device prepare the plural nanometer material and the nanometer material with special function. The method of the invention can be used in catalyzing and sensor.
Owner:SICHUAN UNIV
Catalytic sensor structure
The invention provides a nanostructure including nanowires having very small diameters and integrated at a high density, and capable of being applied to still further high-functional devices.The invention provides a structure including a substrate or substrate having an underlayer, and a structure formed on the substrate or substrate having an underlayer, wherein the structure includes a columnar first part (part) and a second part (part) formed to surround the first part, and the second part comprises two or more types of materials capable of forming eutectic crystals, one type of the materials is a semiconductor material, and the height of the first part from the substrate is greater than the height of the second part from the substrate.
Owner:CANON KK
Catalytic sensor
InactiveUS6911180B2Little effectLow costAnalysing fluids using sonic/ultrasonic/infrasonic wavesComponent separationElectrical resistance and conductanceElectricity
A combustible gas sensor includes an active element in electrical connection with a measurement circuit. The measurement circuit includes a thermistor network to compensate for the effect of changes in ambient temperature to the resistance of the active element. Another combustible gas sensor includes an active element having a geometric surface area no greater than approximately 0.5 mm2 in electrical connection with a measurement circuit. The measurement circuit includes a compensator that compensates for the effect of changes in ambient temperature to the resistance of the active element without compensating for heat lost by thermal conduction from the active element. A method of sensing gas including the steps of: (i) providing a catalytic active element having a geometric surface area sufficiently small such that the effect upon the output of the active element of heat lost from the active element by thermal conduction is relatively small, and (ii) compensating for only the effect of changes in ambient temperature upon the output of the active element.
Owner:MINE SAFETY APPLIANCES CO +1
Carbon nanotube uniformly and stably loaded with iron-containing nano particles and preparation method of carbon nanotube
The invention relates to a carbon nanotube uniformly and stably loaded with iron-containing nano particles and a preparation method of the carbon nanotube. According to the invention, the carbon nanotube is prepared through the following steps: with a hydroxylated or carboxylation modified multiwalled or single-walled carbon nanotube, a non-ionic polymer surfactant, and an organic iron compound as raw materials and ethyl alcohol or methanol as a medium, reaction is carried out in a high-pressure reaction kettle with the filling amount of 80% for 4-24 h, and the product is heated for 5 minutes to 2 h under the conditions of 250-800 DEG C and inert gas protection. The obtained carbon nanotube uniformly and stably loaded with the iron-containing nano particles is characterized in that the iron-containing nano particles are uniformly loaded on the outer surface of the carbon nanotube, the nano particles are one of ferric oxide, ferroferric oxide, and iron, narrow in particle size distribution, and 5-20 nm in average particle size, and can be stably loaded on the carbon nanotube under the effects of severe mechanical dispersion or ultrasonic dispersion, and the carbon nanotube has a good application prospect in the fields of catalysis, sensors, electromagnetic shielding material, new energy material, biotechnology, high-performance composite material and the like.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Whole-range combustible gas detector
InactiveCN101738420AAccurate measurementReduce complexityMaterial resistanceHigh concentrationAudio power amplifier
The invention discloses a whole-range combustible gas detector. In a detection and control circuit of the whole-range combustible gas detector, a measuring bridge consists of a sensing element RH, a compensating element RB and resistors R1 and R2, another measuring bridge consists of a compensating element RB and resistors R2, R3 and R4, the two measuring bridges are respectively controlled by switch pipes to be switched on of off, and the midpoints of two arms of the measuring bridges are accessed to an amplifier circuit for an instrument; when the concentration of a combustible gas is lower than 100 percent LEL (Lower Explosive Limit), the front measuring bridge works; and when the concentration of the combustible gas is higher than 100 percent LEL, the rear measuring bridge works. The invention overcomes the weakness that a conventional catalytic sensor can only measure the combustible gas with the concentration lower than explosive limit concentration, realizes double functions that a pair of sensors can accurately measure high-concentration and low-concentration combustible gases and fundamentally solves the problems of short service life and poor contact of the traditional membrane switch or the traditional microswitch by an induction key technology.
Owner:抚顺市计量测试所
Exhaust system comprising catalysed soot filter
An exhaust system for a lean burn internal combustion engine comprises: (a) a catalysed soot filter (CSF) (32); (b) a control unit (38); (c) means (18), controllable by the control unit, for 5 increasing a content of combustible hydrocarbon (HC) and / or carbon monoxide (CO) in an exhaust gas flowing into the CSF thereby to combust the HC and / or CO in the CSF, to increase the temperature of the CSFand to combust particulate matter collected thereon; and (d) catalysed sensor means (36) disposed between an engine manifold (28) and the CSF for combusting CO and / or HC in exhaust gas flowing in theexhaust system and inputting the control unit wit h a 10 datum correlat ing with an enthalpy of combustion of HC and / or CO in the exhaust gas, whereby the control unit, when in use, controls the combustible HC and / or CO introducing means in response to the datum input thereby to control the rate of contacting the CSF with combustible HC and / or CO.
Owner:JOHNSON MATTHEY PLC
Composite material by using carbon nano-tube as core and ferriferrous oxide as shell and preparation method thereof
ActiveCN105148837ASimple processLow costOther chemical processesAlkali metal oxides/hydroxidesIron powderHexamethylenetetramine
The invention relates to a composite material by using a carbon nano-tube as a core and ferriferrous oxide as a shell and a preparation method thereof. The composite material is characterized in that a Fenton reagent comprising FeCl2 / H2O2, reductant iron powder, a carbon nano-tube and precipitant urea or hexamethylenetetramine are used as raw materials. The preparation method comprises the following steps of, firstly, performing surface hydroxylation modification on the carbon nano-tube with the Fenton reagent; then, adding a proper amount of the iron powder to regulate the concentration of Fe<2+> ions, further precipitating the iron ions with urea or hexamethylenetetramine by adopting a homogeneous precipitation method under a proper condition; and finally, conducting separating, washing, drying and other processes on the precipitate to obtain a final product. The carbon nano-tube / ferriferrous oxide composite material with a 'core-shell' structure is characterized by having a special structure by using the carbon nano-tube as the core and the ferriferrous oxide as the shell; and ferriferrous oxide having a continuous thin-layer structure uniformly covers the outer surface of the carbon nano-tube, and the interface between the core and the shell is weak. The preparation method is simple in process, and the product has a wide application prospect in chemical catalysis, sensors, new energy materials, electromagnetic shielding materials, high-performance polymer-based composite materials and other fields.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Combustible gas detector having flow-through sensor container and method for measuring such gases
InactiveUS7062952B2Inhibited DiffusionWithdrawing sample devicesMaterial resistanceCombustible gasProduct gas
An apparatus and method to measure combustible gases using a catalytic sensor includes: housing the catalytic sensor in a flow-through chamber isolated from a volume of ambient gas; periodically drawing into the chamber a sample of the ambient gas; burning on the catalytic sensor and in the chamber the combustible gas in the sample of ambient gas, e.g. essentially until the completion of burn out, and measuring the plurality of output signals of the sensor synchronously with the interrupted ambient gas sampling while burning the sample on the catalytic sensor.
Owner:BAKER HUGHES INC
Exhaust system comprising catalysed soot filter
An exhaust system which has a catalysed soot filter (CSF), a control unit, and a catalyzed sensor. The exhaust system, controllable by the control unit, can increase hydrocarbon (HC) and / or carbon monoxide (CO) content in an exhaust gas flowing into the CSF resulting in combustion of the HC and / or CO in the CSF, a temperature increase of the CSF, and combustion of particulate matter collected on the CSF. The catalyzed sensor is disposed between an engine manifold and the CSF, and combusts CO and / or HC in the exhaust gas and inputs the control unit with a datum correlating with an enthalpy of combustion of HC and / or CO in the exhaust gas, thereby controlling the content of the combustible HC and / or CO in the exhaust gas flowing into the CSF. The catalysed sensor is the only catalysed component in the exhaust system disposed between the engine and the CSF.
Owner:JOHNSON MATTHEY PLC
Method for preparing short CaGeO3 fiber with electrostatic spinning technology
The invention relates to a method for preparing a CaGeO3 metal oxide fiber provided with d10 electronic configuration with electrostatic spinning technology, belongs to the technical field of a preparation technology of a mixed metal oxide fiber material. The method is characterized in that germanium dioxide, hydroiodic acid and calcium nitrate tetrahydrate are taken as raw materials, and polyvinylpyrrolidone is taken as a stabilizer; and an electrospinning liquid containing polymer precursors is prepared with a sol-gel method, and the short CaGeO3 fiber is prepared with the electrostatic spinning technology. The technological process is simple, convenient and easy to practice, requirements for equipment are low, and a product phase with required higher purity degree can be obtained; the length of the CaGeO3 fiber prepared with the method ranges from 10 mu m to 30 m um, and the diameter is about 1.2 mu m; and the fiber material is expected to be applied to the fields of luminescence, photocatalysis, sensors and the like.
Owner:SHANGHAI UNIV
Methods And Systems For Oxygen Sensor
ActiveCN104061081AElectrical controlInternal combustion piston enginesOxygen sensorEnvironmental engineering
Owner:FORD GLOBAL TECH LLC
Gas sensor
ActiveUS20130202490A1Short response timeImprove gas sensitivityMaterial heat developmentMaterial resistanceCombustible gasWaste management
A gas sensor for detecting combustible gases is provided with a catalytic sensor element. The catalytic sensor element is arranged in a housing (1) surrounding the catalytic sensor element on all sides. The housing has a gas-permeable inlet opening. The gas sensor has electric lines, which are in connection with the sensor element and have terminals located outside of the housing (1). The housing has a gas-permeable inlet opening (2) and a gas-permeable outlet opening (3) and a flow channel (4) connecting the gas-permeable inlet opening (2) and the gas-permeable outlet opening (3). The sensor element is arranged in the flow channel
Owner:DRAGER SAFETY
Glucose non-enzymatic catalytic sensor and preparation method thereof
ActiveCN109342529AEfficient detectionPlay the role of mimic biological enzymeMaterial analysis by electric/magnetic meansGlucose sensorsPorphyrin
The invention relates to a non-enzymatic catalytic sensor for glucose and a preparation method thereof. Meso-Tetrakis (4-(N-methylpyridyl)) porphyrin iron (III) molecule (abbreviated as FeTMPyP) self-assembles calixarene-modified gold nanoparticles into three-dimensional gold nanostructures, the system of which will be constructed onto a gold electrode modified with the same calixarene so that a glucose sensor composed of three-dimensional gold nano-particles is produced, the hydrogen peroxide and glucose is catalyzed by a double catalytic system under electrochemical conditions to achieve thesame measuring effect as a glucose sensor. The invention utilizes the self-assembly of the three-dimensional structure of the gold nanometer by the porphyrin, and greatly expands the application of the calixarene functionalized gold nanoparticle, so as to facilitate the greater application for the functionalized gold nanoparticles in the future production, human lives and researches. The invention also provides a more convenient method for the detection of glucose in disease surveillance and industrial production.
Owner:SHANGHAI UNIV
Preparation method of Ag nano particles
ActiveCN111215636AMild conditionsReduce power consumptionNanotechnologyPeristaltic pumpCapillary Tubing
The invention provides a preparation method of Ag nano particles. The method is characterized in that a high-voltage direct-current power supply is used for providing electric energy, a platinum needle is taken as an anode, an AgNO3 solution is driven by a peristaltic pump to flow through a buffer bottle and overflows from the top end of a capillary tube where a graphite carbon rod penetrates, andthe overflowing solution is taken as a discharge cathode; when enough high voltage is applied between the two electrodes, the overflowing solution generates glow to form plasma, active particles generated by the solution cathode glow discharge plasma react with Ag+ in the solution, and generated Ag nano particle turbid liquid flows into a collector along the wall of the graphite carbon rod; and finally the turbid liquid is subjected to ultrasonic dispersion, centrifugal separation, washing by distilled water, drying to constant weight, and grinding to obtain the Ag nano particles. The Ag nanoparticles synthesized through the preparation method are uniform in structure, good in dispersity and low in agglomeration degree, and have a wide application prospect in the aspects of catalysis, sensors, electrode materials and the like.
Owner:NORTHWEST NORMAL UNIVERSITY
Intelligent analysis system for combustible mixed gas based on catalytic sensor
InactiveCN103196950AThe peripheral circuit is simpleEasy wiringMaterial heat developmentAnti jammingCombustible gas
Owner:SUZHOU VOCATIONAL UNIV
Planar Thermocatalytic Sensor of Combustable Gases and Vapours
ActiveUS20180128760A1Reduce power consumptionImprove the sensitive elements parametersMaterial heat developmentMaterial resistanceGas analysisHemt circuits
The invention relates to gas analysis and to combustible gas and vapour analyzers based on a thermocatalytic operating principle. The subject of the invention is a sensor the sensitive elements of which are manufactured by planar techniques that can be easily automated. The main distinguishing feature is that a working sensitive element and a reference sensitive element are colocated in a single micron-sized structural component (a microchip) on a common substrate made of porous anodic aluminium oxide. The design of the sensitive elements provides for film-wise heat transfer from heated parts of the working and reference sensitive elements. Measuring microheaters which heat the working and reference sensitive elements up to working temperatures and provide for differentially measuring an output signal in a measuring bridge circuit are spaced apart at opposite sides of the anodic aluminium oxide substrate and are disposed on arms projecting beyond the common substrate configuration. The sensitive elements are disposed in a reaction chamber having restricted diffusion access via a calibrated orifice, and the diameter of regular pores in the microchip substrate is increased to sizes that provide for a predominantly molecular diffusion mode in the pores (100 nm or more).
Owner:ROSNEFT OIL CO
Minepit environment flammable gas analyzing method and device
InactiveCN101021542AGood choiceGuaranteed accuracyChemical analysis using catalysisControl signalDisplay device
This is an analytical method and device of the combustible gas in the mine ,which belongs to detecting and analyzing the various combustible gases around the industrial and mining area. This analytical method uses a catalytic sensor and puts it around the mixed combustible gas with the single chip outputting the controlling signal towards the electric field controller which exerts different electric fields to the catalytic sensor. The catalytic sensor exports the signal of different and mixed combustible gas that is input to the single chip through the closed loop monitor. The single chip analyses the combustible gas including its kind and viscosity and layouts the result via the DDU. This device adds two metallic polar plates to the catalytic sensor which is exerted different electric fields by the electric field controller through the program control. The closed loop monitor adjusts the working current of the catalytic sensor and outputs the sample signal of the current. The circuit of the single chip exercises the analog-to-digital conversion towards the detecting signal, processes the data and finally layouts the analytical results of the combustible gas through the DDU.
Owner:CHINA UNIV OF MINING & TECH
Gas sensor
ActiveUS9201032B2Short response timeImprove gas sensitivityMaterial heat developmentBiological testingCombustible gasElectric wire
A gas sensor for detecting combustible gases is provided with a catalytic sensor element. The catalytic sensor element is arranged in a housing (1) surrounding the catalytic sensor element on all sides. The housing has a gas-permeable inlet opening. The gas sensor has electric lines, which are in connection with the sensor element and have terminals located outside of the housing (1). The housing has a gas-permeable inlet opening (2) and a gas-permeable outlet opening (3) and a flow channel (4) connecting the gas-permeable inlet opening (2) and the gas-permeable outlet opening (3). The sensor element is arranged in the flow channel.
Owner:DRAGER SAFETY
Metal reinforced porous diamond film and preparation method thereof
ActiveCN113186510ASimple methodEasy to operateVacuum evaporation coatingSputtering coatingMicron scaleSputtering
The invention discloses a metal reinforced porous diamond film and a preparation method thereof, and belongs to the technical field of diamond films. According to the metal reinforced porous diamond film and the preparation method thereof, a nano or micron-sized diamond film is deposited by adopting a microwave chemical vapor deposition technology, a layer of oxide is sputtered on the surface of the diamond film by adopting a magnetron sputtering method, then the diamond film is put into a microwave chemical vapor deposition system, the diamond film is etched by using hydrogen argon or hydrogen plasma, then the diamond film is put into a sodium nitrate solution to be heated, the diamond film is further etched, non-diamond phases and metal nanoparticles generated during plasma etching are removed, platinum, gold and other precious metal elementary substances are subjected to magnetron sputtering again, finally, the diamond film is put into the microwave chemical vapor deposition system to disperse precious metal, and the metal reinforced porous diamond film with a good shape is obtained. The preparation method is simple and easy to operate, the surface of the prepared diamond film is of a porous structure, the filled precious metal is a good catalyst, and the diamond film has wide application prospects in the fields of chemical catalysis, sensors and the like.
Owner:KUNMING UNIV OF SCI & TECH
CJY4/25X suspension type methane and oxygen measuring device
The invention provides a CJY4 / 25X suspension type methane and oxygen measuring device. Air information firstly received by a methane sensor and an oxygen sensor is transmitted to a catalytic sensor; the air information is transmitted to a wireless receiving and transmitting module through the catalytic sensor, transmitted to an A / D converter through the wireless receiving and transmitting module and converted into a digital signal through the A / D converter; the digital signal is transmitted to a single-chip microcomputer and digitally processed, the digital signal digitally processed through the single-chip microcomputer is transmitted to a controller, and after the digital signal is processed through the controller, a corresponding methane concentration value and a corresponding oxygen concentration value are displayed in a digital mode; safety performance is higher, performance is stable, a threshold is accurate, responses are quick, and precision is high. Meanwhile, the overall operation is easy, use is convenient, the structure is novel, appearance is unique, the size is small, the weight is low, the device is convenient to carry, the functions are diversified, use time is long, the detection range is wide, and requirements of manufacturers can be better met.
Owner:YANGZHONG SOUTH MINE ELECTRICAL
Inflammable gas detecting instrument and desulphurization method thereof
ActiveCN102507666BDesign scienceEasy to usePreparing sample for investigationMaterial resistanceCombustible gasPower circuits
Owner:HENAN HANWEI ELECTRONICS
Mining catalytic sensor failure data filtering method based on neural network
PendingCN114004148AImprove detection accuracyDesign optimisation/simulationNeural architecturesEngineeringArtificial intelligence
The invention relates to a mining catalytic sensor failure data filtering method based on a neural network, and belongs to the field of sensor data filtering, and the method comprises the following steps: S1, obtaining a response curve of a mining catalytic sensor; s2, taking the response curve as a sample material for interval sampling, acquiring a plurality of points from the response curve as a group of sample data, and sampling a plurality of groups of sample data; s3, inputting the sample data into a neural network, and constructing and training a failure data recognition model; s4, simulating the failure data identification model; and S5, applying the trained failure data identification model to a sensor system, and filtering failure data. The neural network is applied to the sensor system, failure data are judged and filtered, and the detection precision of the sensor is greatly improved.
Owner:CHINA COAL TECH ENG GRP CHONGQING RES INST
Heavy oil catalysis device
InactiveCN107779219AControl contact timeIncrease the distance moved up and downCatalytic crackingHydrocarbon oils treatmentContact timeFuel oil
The invention discloses a heavy oil catalytic device, which comprises a telescopic support and a catalytic tube frame, the telescopic support is fixedly connected to a motor through a connecting frame, the motor is electrically connected to a PLC controller, and the rotating end of the motor is connected to the motor through a bearing. The electric telescopic rod in the telescopic bracket is fixedly connected, the inner side of the telescopic bracket is provided with a chute, the catalytic tube frame is slidably connected with the chute inside the telescopic bracket through a slider, and the bottom end of the telescopic bracket is provided with a connector. The PLC controller is arranged on the connecting head, the catalytic tube frame is provided with a catalytic tube, the catalytic tube is hinged with the catalytic tube frame through a hinge buckle, the bottom end of the catalytic tube frame is provided with an inductor, and the sensor The device is electrically connected with the PLC controller. The heavy oil catalytic device can accurately control the contact time between the catalyst and the heavy oil, so as to control the entire catalytic process, has a simple structure, and has good application effect.
Owner:黄建辉
Organic solvent gas concentration detection method
PendingCN113917076AAvoid interferenceGuaranteed accuracyGas analyser calibrationGas analyser construction detailsOrganic solventPhysical chemistry
The invention discloses an organic solvent gas concentration detection method, which adopts a catalytic combustion type combustible gas sensor B1 and an oxide semiconductor type gas sensor B2 to perform concentration detection, and during concentration detection, temperature compensation coefficients of B1 and B2 under different temperature conditions are firstly calculated for subsequent temperature compensation; secondly, the relative sensitivity of B1 and B2 in different organic solvent gas environments are calculated, a main detection sensor and a calibration sensor of each organic solvent gas are selected, and a calibration concentration value is output according to the values of the main detection sensor and the calibration sensor; and finally, an actual concentration value is obtained according to the calibration concentration value and the temperature compensation coefficient. According to the method, concentration information is calibrated under the combined action of the catalytic sensor and the semiconductor sensor, temperature compensation is carried out in combination with the temperature coefficient, and therefore output data is accurately metered, and the method is low in cost and long in service life.
Owner:四川希尔得科技有限公司
Methods and systems for oxygen sensors
ActiveCN104061081BAdjust jetElectrical controlNon-fuel substance addition to fuelOxygen sensorEnvironmental engineering
The present invention relates to methods and systems for oxygen sensors. Various systems and methods are described for an engine system having an exhaust gas recirculation system and catalytic and non-catalytic intake oxygen sensors. In one example, the catalytic oxygen sensor is used to measure and control exhaust gas recirculation while measuring and controlling fuel vapor purge based on the catalytic and non-catalytic sensors.
Owner:FORD GLOBAL TECH LLC
Minepit environment flammable gas analyzing method and device
InactiveCN101021542BGood choiceGuaranteed accuracyChemical analysis using catalysisControl signalDisplay device
This is an analytical method and device of the combustible gas in the mine ,which belongs to detecting and analyzing the various combustible gases around the industrial and mining area. This analytical method uses a catalytic sensor and puts it around the mixed combustible gas with the single chip outputting the controlling signal towards the electric field controller which exerts different electric fields to the catalytic sensor. The catalytic sensor exports the signal of different and mixed combustible gas that is input to the single chip through the closed loop monitor. The single chip analyses the combustible gas including its kind and viscosity and layouts the result via the DDU. This device adds two metallic polar plates to the catalytic sensor which is exerted different electric fields by the electric field controller through the program control. The closed loop monitor adjusts the working current of the catalytic sensor and outputs the sample signal of the current. The circuit of the single chip exercises the analog-to-digital conversion towards the detecting signal, processes the data and finally layouts the analytical results of the combustible gas through the DDU.
Owner:CHINA UNIV OF MINING & TECH
Method for preparing nanoporous silver by electrodeposition
ActiveCN110396705BStable mixed solutionAchieving electrochemical co-depositionNanotechnologyElectroforming nanostructuresSulfite saltCopper nitrate
The invention discloses a method for preparing nanoporous silver by electrodeposition. It first drops silver nitrate solution into potassium iodide solution and stirs, copper nitrate solution and sodium sulfite solution are mixed, then drops into potassium iodide solution and stirs, and then the obtained [AgI 2 ] ‑ Complexation solution and [CuI 2 ] ‑ After the complex solution is mixed, place silver-silver chloride as a reference electrode, a graphite sheet as a counter electrode, a conductive substrate or a conductive template as a working electrode in the obtained complex mixed solution for electrodeposition, and then, the obtained The silver-copper alloy on the surface of the conductive substrate or the conductive template with the silver-copper alloy are immersed in saturated potassium iodide solution for cleaning, and then the pure silver-copper alloy on the surface of the conductive substrate or the pure silver-copper alloy on the conductive film are immersed in ammonia water and The mixed solution of ethanol is mixed with oxygen, and the nanoporous silver with various shapes and sizes with a pore diameter less than or equal to 20nm can be prepared. Its products are extremely easy to be widely commercialized in the fields of catalysis, sensors, fuel cells and SERS spectral detection.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
A kind of preparation method of ag nanoparticles
ActiveCN111215636BMild conditionsReduce power consumptionNanotechnologyPeristaltic pumpHigh-voltage direct current
The invention provides a preparation method of Ag nano-particles. Electric energy is provided by a high-voltage direct current power supply, a platinum needle is an anode, and AgNO is used as an anode. 3 The solution flows through the buffer bottle driven by the peristaltic pump, overflows from the top of the capillary penetrating the graphite carbon rod, and uses the overflowing solution as the discharge cathode. When a high enough voltage is applied between the two electrodes, the overflowing liquid produces a glow to form a plasma, and the active particles generated by the liquid cathode glow discharge plasma and the Ag in the solution + The reaction occurs, and the generated Ag nanoparticle turbid liquid flows into the collector along the wall of the graphitic carbon rod. Finally, the turbid liquid is ultrasonically dispersed, centrifuged, washed with distilled water, dried to constant weight, and ground to obtain Ag nanoparticles. The Ag nanoparticles synthesized by the preparation method have uniform structure, good dispersibility and low degree of agglomeration, and have broad application prospects in catalysis, sensors, electrode materials and the like.
Owner:NORTHWEST NORMAL UNIVERSITY
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