62results about How to "Strong chemical stability" patented technology

The invention discloses a preparation method of an injectable gel material of sodium alga acid-protein adhesive used for treating myocardial infarction, relating to injectable hydrogelin and a preparation method of the hydrogelin. The material and the method solve the technical problems of the existing injectable hydrogelin using calcium ion for crosslinking such as poor compatibility with organisms and undesirable mechanical property. The injectable gel material of sodium alga acid-protein adhesive used for treating myocardial infarction is made from the component sodium alga acid and the component protein adhesive that are mixed. The preparation method includes: adding sodium alga acid in water to oscillate with light avoidance on a table concentrator, thus generating partially oxidized sodium alga acid solution; adding glycol to the solution and placed on the table concentrator to oscillate, then adding sodium chloride to oscillate, dissolve and precipitate, dissolving the precipitate in water to attain collosol, and dialyzing and freeze-drying to obtain partially oxidized sodium alga acid; formulating the sodium alga acid solution to obtain sodium alga acid component; formulating gelatin or collagen to obtain protein adhesive component; and mixing the sodium alga acid component with the protein adhesive component for use. The injectable gel material can be used for treating myocardial infarction.

The invention relates to a graphene capacitance touch screen and a manufacturing method thereof. The touch screen is characterized by comprising a cover plate layer, an OCA optical clear adhesive layer and a graphene transparent conductive film layer, wherein a circuit layer is arranged on the lower surface of the graphene transparent conductive film layer, and an electrode layer is arranged on the periphery of the circuit layer, and is used for leading out the circuit layer. When the touch screen works, a low-voltage alternating-current electric field is formed in the graphene transparent conductive film layer, when a user finger touches the surface of the graphene capacitance touch screen, a coupling capacitor is formed between the finger and the graphene transparent conductive film layer, and a certain amount of electric charge is transferred to the human body at that time, and electric charge is supplied from four corners of the graphene capacitance touch screen to restore the electric charge loss, and the distance of the electric charge amount supplied from each direction and the touching point is proportional, so that the location of the touching point can be calculated.

The invention discloses a high temperature anti-slag anti-coking coating comprising the components (by weight ratio) of zirconium dioxide 20-50 parts, aluminum oxide 14-20 parts, magnesium oxide 14-20 parts, fluorosilicate 3-5 parts, metal powder 3-5 parts, rare-earth oxide 2-3 parts, soluble silicate 30-50 parts, orthophosphates 3-5 parts.

The invention relates to a binder for a lithium ion battery compound pole piece, a preparation method for the binder, a compound pole piece, a battery core, and a lithium ion battery and belongs to the technical field of lithium ion batteries. The binder for the lithium ion battery compound pole piece comprises the flowing components in parts by weight: 0.5-1.5 parts of an ethylene-vinyl acetate copolymer, 100-150 parts of barium sulfate particles, 1-1.5 parts of a thickener, and 98.5-99 parts of water. According to the invention, the surface of the pole piece is coated with a layer of the binder, a diaphragm is arranged on the surface of the binder on the pole piece, and then hot-pressing compounding is performed, so that the pole piece and the diaphragm are bound together, and the absolute positioning of the pole piece and the diaphragm is realized, a malposition phenomenon between the pole piece and the diaphragm in a following assembling process can be avoided, and the safety of the lithium ion battery can be improved.

The invention relates to a preparation method of a pig serum albumin molecularly imprinted material and application thereof to selectively removing the albumin from human serum. The method comprises the following steps: the pig serum albumin is taken as a template; a protein imprinted material is obtained by an in situ polyreaction of a functional monomer, a cross-linking agent, a pore-forming agent, a surfactant and template protein, and the characteristic that the human serum albumin has high homology with the pig serum albumin is employed to successfully applying the material to removing the albumin from the human serum. The method can help solve the problem of difficult albumin sources by taking human albumin as imprinted templates, and realize the selective removal of the albumin from the human serum by the prepared molecularly imprinted material. The invention provides a new high-abundance protein removal method for proteomics studies.

The invention discloses a polysulfonamide fiber-containing dry mica tape, which comprises a mica layer, a bonding agent layer and a reinforcing material layer in sequence from the top to the bottom, wherein the mica layer consists of mica powder, polyphenyl sulfone p-phenylene formamide fiber and a bonding agent; the content of the polyphenyl sulfone p-phenylene formamide fiber accounts for 2-50 percent by weight of total mass of the mica layer; and the content of the bonding agent accounts for 2-25 percent by weight of the total mass of the mica tape. The invention has the remarkable technical advantages that: 1, the dry mica tape has high permeability; in the presence of the polysulfonamide fiber, a relatively loose structure and gaps with certain continuity can be formed in an insulating layer, so that the permeability of the dry mica tape can be improved, and impregnation of impregnated resin is better facilitated; 2, heat-resisting organic fiber in a certain proportion is added into the mica layer, namely, the mechanical strength of the mica layer is improved; and 3, heat-resisting organic fiber used in the mica tape is superior to Nomex fiber on the aspects of heat resistance, impregnating performance, radiance resistance, high-temperature size stability, flame retardance and chemical stability, has excellent electrical insulating performance simultaneously, and is more suitable for manufacturing a mica type with a motor in an insulating way than Nomex fiber.

The invention relates to a waterborne polyurethane polymerization monomer, and relates to a waterborne polyurethane emulsion which is obtained by polymerizing the waterborne polyurethane polymerization monomer. The waterborne polyurethane emulsion is prepared by the following raw materials in percentage by weight: 5-20% of oligomer polyols, 0-5% of micromolecule chain extender, 5-14% of diisocyanate, 1-5% of hydrophilic chain extender, 1-5% of saltifying reagent, 0.1-0.5% of catalyst and 50-70% of deionized water. The invention also relates to a preparation method of the waterborne polyurethane emulsion. The waterborne polyurethane emulsion provided by the invention has strong chemical stability, good water tolerance and solvent resistance, excellent adhesive force and favorable flame retardance, so that the research gap of waterborne polyurethane products simultaneously containing phosphoric acid hydrophilic group and carboxylic acid hydrophilic group in the prior art is filled.

The invention discloses a composite fiber material used in a mixed asphalt material. The composite fiber material is prepared by mixing and uniformly stirring the following raw materials in percentage by weight: 48-53% of cellulose fiber, 30-34% of basalt fiber and 16-20% of sepiolite fiber. The composite fiber material disclosed by the invention is prepared by mixing and uniformly stirring three different fiber materials according to a ratio, the improvement effect on pavement properties of single fiber materials in the mixed asphalt material can be carried into the composite fiber materials, the composite fiber material which can comprehensively improve the pavement property of the mixed asphalt material is developed, and compared with the mixed asphalt material which is modified by using single fiber, the composite fiber material is capable of comprehensively improving various pavement properties of a road asphalt surface layer, and is high in cost performance.

The invention belongs to the field of water body purification treatment and provides a biological carrier for purifying a water body. The biological carrier comprises a steel wire rope, lock latches, basalt fiber bundle group pieces, PVC end pieces and PVC short sleeves, wherein the components are in a relationship that the basalt fiber bundle group pieces are arranged on the anti-dropping PVC end pieces; adjacent basalt fiber bundle group pieces are partitioned by a plurality of PVC short sleeves; the PVC end pieces are arranged at the tail ends of the basalt fiber bundle group pieces; the central steel wire rope penetrates through the central holes of the components; two ends of the central steel wire rope are locked and fixed into rings by the lock latches. The basalt fiber wires on basalt fiber pieces stretch in an annular manner. The biological carrier for purifying the water body, which is provided by the invention, has the characteristics that the fiber wires are easy to stretch, not easy to drop off, long in service life, large in specific surface area, high in utilization efficiency and the like.

The invention provides a nickel-based material. The nickel-based material comprises a core material represented by the FORMULA (I) and a Li<4>SiO<4> coating layer coated on the surface of the core material. The invention further provides a preparation method of the nickel-based material. The preparation method of the nickel-based material comprises the following steps of: mixing methyl silane with an organic solvent, then, adjusting the pH value, and reacting to obtain coating liquid; mixing the coating liquid with a precursor material represented by the FORMULA (II) to stir, so that an initial nickel-based material is obtained; and, performing high-temperature solid-phase reaction after mixing the initial nickel-based material with lithium salt, so that the nickel-based material is obtained. Li<4>SiO<4> is coated on the surface of the core nickel-based material; the obtained nickel-based material is used as the cathode material; and thus, a lithium ion battery has better cycle performance and rate capability.

The invention provides a technology for preparing antibacterial ceramic under a condition of low temperature. The technology is characterized by utilizing an SiO2-Al2O3-B2O3-MO multi-component inorganic material as a carrier, wherein MO referring to auxiliaries such as a ceramic reinforcing auxiliary, a toughening auxiliary and a fluxing auxiliary; and sintering an antibacterial activator on the surface of ceramic at the temperature of 750-1000 DEG C, thereby enabling the ceramic to obtain antibacterial property. The antibacterial activator is one or two of nanometer silver oxide or silver oxide. The sintered antibacterial activator can be firmly attached on the surface layer of the ceramic and has a smooth surface, strong breakage resistance and strong chemical stability. By adopting a low temperature sintering process, the antibacterial activator can be protected very well, the usage amount of the antibacterial activator can be reduced remarkably, and the technology has obvious economic benefit. The antibacterial rate of the prepared antibacterial ceramic to common viruses and bacteria such as escherichia coli and staphylococcus aureus achieves over 95-99%.

A method for preparing porous fluorapatite ceramic adsorbing radioactive nuclide is characterized by including: using the materials in percent by weight: 50-80% of calcium pyrophosphate, 4-26% of calcium fluoride and 16-45% of calcium carbonate, and mixing, ball-milling, drying, press-forming, calcining, grinding, and screening to obtain fluorapatite powder; mixing the fluorapatite powder with polyethylene glycol solution, methyl cellulose solution and hydrogen peroxide solution, and performing microwave assisted pore-forming, drying and the like to obtain a porous fluorapatite ceramic blank; preparing porous fluorapatite ceramic adsorbing material via normal pressure sintering. The porous fluorapatite ceramic adsorbing material prepared herein has the advantages of high radiation stability, good thermal stability, high mechanical and chemical stability and the like, also has high specific surface energy and nuclide adsorbing capacity and may be used as an efficient adsorbing material for radioactive nuclide in high-radioactive waste liquid, thus effectively protecting human health and ecological environment.

The invention discloses novel application of a collagen matrix as a tissue engineering scaffold. The collagen matrix comprises the following substances expressed in mass parts: 50 to 90 of collagen, 8 to 48 of chitosan and 0.5 to 5 of glycerin. A preparation method for the collagen matrix comprises the following steps: 1) dissolving collagen in an acetic acid aqueous solution with a concentration of 0.01 to 0.1% to prepare a collagen solution with a concentration of 1 to 3%; 2) dissolving chitosan in the acetic acid aqueous solution with a concentration of 0.01 to 0.1% to prepare a chitosan solution with a concentration of 1 to 3%; 3) mixing the collagen solution, the chitosan solution (in terms of dry weight) and glycerin according to a mass ratio of 50-90: 8-48: 0.5-5 and carrying out freeze drying at a temperature of -80 DEG C to -10 DEG C for 1 to 5 d so as to obtain a spongy material; 4) immobilizing the spongy material with an aldehyde cross-linking agent at a temperature of 40 to 50 DEG C for 20 to 100 min; and 5) rinsing the spongy material with an aqueous solution of glycerin and drying the spongy material in vacuum so as to obtain the collagen matrix. According to results of cell culture experiments, the collagen matrix provided by the invention can promote cell growth and can be used as a tissue engineering scaffold.

The invention discloses a one-dimensional organic semiconductor nano material and a preparation method and an application thereof. The material employs a unsymmetrical perylene bisimide derivative monomer as a construction monomer, hydrophilic branched-chain alkyl (5-nonane) and pentafluorophenyl substituent are respectively introduced at two sides of perylene bisimide, and the one-dimensional organic semiconductor nano material can be obtained by self assembly preparation through Pi-Pi interacting of construction monomers. The one-dimensional organic semiconductor nano-material has the advantages of high fluorescence quantum yield, porous performance, large surface area, and good stability, greatly reduces the detection lowest limitation, has good anti-interference capability for an aggregate such as triphosgene and other common gases and organic solvent steam, and realizes specific and high-sensitivity detection on phosgene.

The invention discloses a supported catalyst for coal gasification. The catalyst comprises a catalyst active component, a catalyst promoter and a carrier, wherein the catalyst active component refers to alkali metal carbonate, and accounts for 5-20% of the total weight of the catalyst; the catalyst promoter refers to a composite oxide, and accounts for 20-40% of the total weight of the catalyst, and the structure of the catalyst promoter is AxA'1- xByB'1-yO3; the carrier refers to silica or gamma-Al2O3, and accounts for 40-75% of the total weight of the catalyst. According to the invention, in a mode of adding the catalyst promoter, the catalytic activity of the active component for coal gasification is promoted, and the volatilization loss of the active component is suppressed, and meanwhile, the catalyst promoter is supported on the carrier with a higher specific surface and an enough strength, so that the original structure and catalytic activity of the catalyst after being reacted are still kept, and then the catalyst can be recycled so as to achieve the purpose of reutilization.

The invention discloses fluorine-containing hydrophobic-associating surface-active polyacrylamide which has the following molecular structure (please see the structure in the description), wherein x=100, y=10-20, z=0.05-1.5, n=4 or 6 or 8, and R and R' represent alkyl. The prepared polyacrylamide has the advantages that the excellent tackifying property, heat resistance and salt tolerance are achieved, the surface tension of water can be reduced to 24-32 mN/m, and the good application prospect on tertiary oil recovery, drilling fluid and paint is achieved.

The invention discloses an environmental protecting and energy conserving fuel. The fuel comprises following components in percentage by weight: 80 to 87 percent of hexamethylenetetramine, 3 to 5 percent of stearic acid, 2 to 2.5 percent of edible paraffin, 5 to 12 percent of ethanol and 0.2 to 0.5 percent of edible flavor. The fuel is strong in chemical stability, and is not decomposed at a high temperature of 50 DEG C and is not fragile at a temperature of 40 DEG C below zero; the fuel can be ignited only by an open fire and can not be ignited without the open fire, so that the fuel can be safely transported at a long distance and stored for a long time; moreover, the fuel is economical, environment friendly, non-toxic and does not generate smokes, flying ashes, residues and harmful gases while firing, and the heat value of the fuel can reach more than 7000kcal/kg.

The invention relates to a preparation method of a dynamic cross flow filtration disc type full silicon carbide filtering membrane, and belongs to the technical field of preparation of advanced ceramics. The preparation method comprises the following steps: weighing a coarse silicon carbide powder I, a fine silicon carbide powder II, a plasticizer and a pore forming material, stirring and dissolving the plasticizer into warm water, sequentially adding the coarse silicon carbide powder I, the fine silicon carbide powder II and the pore forming material, and mixing evenly; conducting compressionmoulding after drying and screening to obtain a biscuit; using the fine silicon carbide powder II and a binder to prepare a concentrated slurry, spraying the concentrated slurry on the outer edge ofthe biscuit, and adhering two biscuits together; sintering to obtain a support body for the disc type full silicon carbide filtering membrane; weighing a fine silicon carbide powder III, a dispersingagent and the binder, adding deionized water, and grinding to obtain a membrane coating solution; spraying the membrane coating solution on the outer surface of the support body, and drying to obtaina semi-finished product of the filtering membrane; and sintering the semi-finished product of the filtering membrane to obtain a finished product of the disc type full silicon carbide filtering membrane. The prepared silicon carbide ceramic membrane has the characteristics of high filtering precision and large separating flux.

The invention relates to a method for removing nitrate nitrogen which can effectively improve the rate of the reaction that nitrate in water is reduced with nano-iron and the removal rate of nitrate nitrogen by adding nano-iron and aluminum salt or iron salt catalyst in nitrate to react. A combination preparation is prepared by the method that firstly nano-iron and aluminum salt or iron salt catalyst are added in a sealed container containing acetone and then the container is irradiated by ultrasound and stirred. The combination preparation has good chemical stability, can directly remove the nitrate pollutants in water and has simple process and convenient operation.

The invention relates to water-based lost-foam casting coating. The water-based lost-foam casting coating consists of the following raw material components in parts by weight: 1.6-2.2 parts of latex powder, 0.2-0.5 part of xanthan gum, 3-4 parts of attapulgite, 0.3-1 part of CMC, 1-1.6 parts of curing starch, 50-60 parts of quartz powder, 80-100 parts of bauxite, and 0.010-0.015 part of a penetrating agent. Compared with the prior art, the water-based lost-foam casting coating has the beneficial effects that: the formula design is reasonable, the preparation process is fine, finished product performances are stable, and the economic benefits and the social value are good.

The invention provides a catalyst composition for preparing 1,2-polybutadiene. The catalyst composition comprises alkyl aluminum, and iron complex with the chemical formula shown as a formula (I): [Fe(CF3SO3)x(L)y], wherein L is ligand which is a phosphorus compound, a nitrogenous compound, a sulfur compound, or an oxygen compound; x is 2 or 3; and y is more than or equal to 1 and less than or equal to 10. The catalyst composition has high catalytic activity at high temperature, has a wide application temperature range, and can be produced industrially. The invention also provides a preparation method for the 1,2-polybutadiene. The preparation method comprises the following steps of: performing polymerization on 1,3-butadiene in an organic solvent under the action of the catalyst composition for preparing the 1,2-polybutadiene to obtain the 1,2-polybutadiene. A small amount of the catalyst composition is adopted in the preparation method, a preparation process is stable, a reaction condition is mild, and the method is easy to operate and low in production cost.

The invention relates to a micro-fluidic chip liquid feeding fixture and a liquid feeding method. The micro-fluidic chip liquid feeding fixture comprises a base, pressing blocks, a positioning device and a fastening device; the positioning device is used for positioning the pressing blocks; the fastening device is used for locking the pressing blocks and fixing the pressing blocks on the base; a plurality of threaded holes are formed in the pressing blocks and correspond to liquid feeding holes in a micro-fluidic chip; the positioning device comprises stop bolts and positioning holes matched with each other; the stop bolts are arranged on the base; the positioning holes are formed in the pressing blocks; the stop bolts penetrate through the positioning holes; the fastening device comprises lock screws for locking and fixing the pressing blocks; and the micro-fluidic chip liquid feeding fixture further comprises micro-channel connectors and liquid feeding hoses. The micro-fluidic chip liquid feeding fixture can realize liquid feeding of the micro-fluidic chip in a high flow rate, high liquid feeding pressure, high efficiency, high speed and stability manner.

The invention discloses water-resisting and flame-retarding waterborne coating and relates to the technical field of coating. The water-resisting and flame-retarding waterborne coating is prepared from the following raw materials in parts by weight: 70 to 80 parts of waterborne acrylic resin, 20 to 27 parts of waterborne polyurethane emulsion, 3 to 6 parts of modified graphene, 2 to 5 parts of montmorillonite, 1 to 4 parts of ground calcium carbonate, 1 to 4 parts of barite, 3 to 5 parts of titanium dioxide, 1 to 4 parts of zinc oxide, 0.2 to 1 part of polytetrafluoroethylene wax, 2 to 5 partsof texanol, 1 to 3 parts of ethylene glycol isooctyl ether, 0.2 to 1 part of dioctyl sodium sulfosuccinate, 0.2 to 1 part of hydroxyethyl cellulose, 0.5 to 2 parts of ethylene glycol, 0.2 to 1 part of de-foaming agent, 0.2 to 1 part of flatting agent and 10 to 20 parts of de-ionized water. According to the water-resisting and flame-retarding waterborne coating, the waterborne acrylic resin is used as a film forming substance; the waterborne polyurethane emulsion is added and is used for modifying; under the cooperative effect of raw materials including the modified graphene and the like, thecoating has excellent water-resisting and flame-retarding performance and good utilization effect and is worthy of being popularized.

The invention provides a preparation method of a goethite/carboxylated cellulose nanocrystalline composite material for removing heavy metal ions. The heavy metal ions are in heavy metal wastewater. The composite material provided by the invention is formed by compounding goethite and carboxylated cellulose nanocrystalline through a hydrothermal method. The problems that goethite is easy to agglomerate, cellulose nanocrystals are difficult to separate and the like are solved, and the adsorption capacity on heavy metal ions is improved. The composite material obtained by the preparation method has relatively high adsorption capacity and relatively high adsorption rate on heavy metal ions such as Pb (II), Cd (II) and As (V). The raw materials used in the method are cheap and easy to obtain, the preparation process is simple, the conditions are mild, and the prepared goethite/carboxylated cellulose nanocrystalline composite material is a heavy metal adsorbent with excellent performance and low cost and has a good application prospect.

The invention discloses a porous sealing device for connecting a vertical flexible barrier system. The porous sealing device comprises an expansion water stopping gasket and connecting latch fittings which are arranged on both sides of an HDPE (High Density Polyethylene) geomembrane and are sealed with the HDPE geomembrane, wherein when each connecting latch fitting on the HDPE geomembrane is tightly buckled with the other connecting latch fitting on the HDPE geomembrane for forming a sealing device, an expansion water stopping gasket cavity for accommodating the expansion water stopping gasket is formed between the two tightly-buckled connecting latch fittings; and the expansion water stopping gasket is filled into the expansion water stopping gasket cavity. The porous sealing device has extremely high anti-stability chemical performance, is resistant to corrosion of pollutants, and has long service life; and membrane surface wall bodies on both sides have extremely high breaking elongation performance, resistance to foundation precipitation, slight earth crust displacement and the like is realized, and durable sealing of a joint on the vertical flexible barrier system can be ensured by adopting seven-grade sealing.

The invention discloses a water-based traffic paint, relates to the technical field of chemical engineering and is prepared from the following components: 40-50 parts of acrylic emulsion, 1-5 parts of propylene glycol, 0.5-4 parts of polyacrylamide, 0.2-0.5 part of silicone oil, 5-10 parts of titanium dioxide, 50-60 parts of calcium carbonate, 0.1-0.2 part of nonionic surface active agent, 0.1-0.2 part of hydroxyethyl cellulose thickener, 0.5-1 part of pH regulator, 0.5-1 part of isothiazole tincture ketone and 3-8 parts of water. Compared with the prior art, the calcium carbonate and multiple auxiliaries adopted by the invention are subjected to melt blending, and the obtained molecular structure can be well compatible with the acrylic emulsion, thus having good toughness; a coalescing agent is added, so that a paint film has strong chemical stability, and the formed paint has good compatibility, no coloring, hydrolysis resistance, no pollution, hot working resistance, high adhesive force and low possibility of falling off.

The invention provides a multifunctional carbon molecular sieve derived from a metal organic framework material/self-polymerized microporous polymer composite, and a preparation method and applicationthereof. According to the invention, the unique properties of metal organic frameworks (MOFs) and self-polymerized microporous polymers (PIMs) themselves are combined together to prepare a high-performance porous carbon molecular sieve adsorbent, and a porous structure with a uniform size and a stable structure and a large number of functionalized sites (such as N and S) generated in the derivation process of the composite are utilized for successfully realizing high-efficiency separation of gas molecules with close three-dimensional structures, molecular sizes and physical properties; at thesame time, high-temperature calcination endows the composite with strong thermal stability and chemical stability; so the multifunctional carbon molecular sieve shows good industrial application prospects in complex gas separation systems and solves the major problem that conventional materials are difficult to achieve high-efficiency separation of gas molecules with close three-dimensional structures, molecular sizes and physical properties.

The present invention is color polycrystalline silicon particle product and its preparation process. The color polycrystalline silicon particle product has silicon content over 98.5 % and particle size of 1.3-500 microns, and is blue, rose, yellow or green with metal luster. The preparation process includes the steps of: preparing polycrystalline silicon particle material with silicon content over 98.5 % and particle size of 1.3-500 microns; heating inside some container to 1000 deg c and maintaining for 0.5-1 hr; heating to 1300 deg c and maintaining for 1-2 hr; and further heating to 1310-1330 deg c for obtaining blue product, to 1340-1350 deg c for obtaining rose product, to 1360-1365 deg c for obtaining yellow product or to 1370-1380 deg c for obtaining green product, and maintaining for 0.2 hr; cooling gradually to room temperature; and sieving to obtain product.

The invention relates to an intelligent electric spark detection alarm system based on a PN junction chip and a preparation method thereof. The system comprises a praseodymium oxide/gallium oxide PN junction chip, an ultraviolet photoelectric detection peripheral circuit, a GSM module and a buzzer, the praseodymium oxide/gallium oxide PN junction chip is connected with the ultraviolet photoelectric detection peripheral circuit, the GSM module and the buzzer are connected to the ultraviolet photoelectric detection peripheral circuit in parallel, the praseodymium oxide/gallium oxide PN junction chip comprises an n-type gallium oxide monocrystalline substrate, a p-type praseodymium oxide film arranged on the n-type gallium oxide monocrystalline substrate, and Ti/Au film electrodes, and the area of the p-type praseodymium oxide film is half of the area of the n-type gallium oxide monocrystalline substrate. According to the praseodymium oxide/gallium oxide PN junction chip, the performance is stable, the responsivity and the sensitivity are high, and the dark current is low; and according to the intelligent electric spark detection alarm system, remote alarm can be realized, the system can be applied to remote electrical fire alarm and detection of high-voltage line coronas and spectrums with specific wavelengths, and the application prospect is wide.

The invention discloses a manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst and a preparation method thereof. The manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst contains 30wt% to 60wt% of manganese dioxide nanoflower. The preparation method comprises the following steps of using the silicon oxide nanofiber as a carrier, using potassium permanganate as a manganese source, using persulfate as an oxidant, performing low-temperature hydrothermal reaction to produce the manganese oxide nanoflower, and loading the manganese oxide nanoflower onto the surface of the silicon oxide nanofiber, so as to obtain the manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst. The manganese dioxide nanoflower and silicon oxide nanofiber compounding type catalyst has the advantages that the dispersivity in water is good, the fixing and forming are easy, the adsorbing ability is strong, the catalyzing activity is high, and the like; the process of the preparation technology is short, the operation is simple, the production efficiency is high, the energy consumption is low, the requirement on equipment is low, and the industrialized production is easily realized.