1630 results about "Dimethylformamide" patented technology

The invention provides a SiO2 / TiO2 / PMMA radiation refrigeration film and a preparation method thereof, and relates to the technical field of passive daytime radiation refrigeration films. The radiation refrigeration film is prepared from the following raw materials: N, N-dimethylformamide, polymethyl methacrylate, silicon dioxide and titanium dioxide. The invention relates to a preparation method of a SiO2 / TiO2 / PMMA radiation refrigeration film. The preparation method comprises the steps of preparing silicon dioxide, preparing titanium dioxide, synthesizing composite sol and preparing the SiO2 / TiO2 / PMMA radiation refrigeration film. The SiO2 / TiO2 / PMMA radiation refrigeration film prepared by the invention has high reflectivity in the ultraviolet-visible-near infrared band and high emissivity in the infrared band, can realize 8.4 DEG C sub-environment refrigeration, and is low in cost and simple in process flow.

The invention discloses a shielding protection adhesive tape for semiconductor integrated circuit packaging and a preparation method thereof, and relates to the technical field of semiconductor integrated circuit packaging. The shielding protective adhesive tape for packaging the semiconductor integrated circuit is prepared by taking polyimide as a base material and coating a coating, and the coating comprises the following raw materials in parts by weight: 3-5 parts of modified nano silicon dioxide, 30-40 parts of N, N-dimethylformamide, 1-3 parts of a curing agent and 1-3 parts of a curing agent. The invention discloses a high-temperature-resistant epoxy resin coating which is prepared from the following components in parts by weight: 25-30 parts of N, N-dimethylformamide, 25-30 parts of a modified acrylate copolymer, 17-26 parts of ethyl acetate, 12-15 parts of epoxy resin, 1-2 parts of a silane coupling agent KH-550, 0.5-1 part of an antioxidant 1010, 0.3-0.8 part of an ultraviolet absorbent UV-327, 1-2 parts of carboxyl-terminated nitrile rubber, 2-4 parts of decabromodiphenyl ether, 0.1-0.3 part of an organic siloxane defoaming agent, 0.2-0.5 part of an acrylate flatting agent and 10-11 parts of diaminodiphenyl sulfone. The adhesive tape contains the modified nano silicon dioxide, the modified acrylate copolymer and other components, so that the performance of the adhesive tape is guaranteed; pretreatment is meticulous, preparation steps are standard, and mass production is easy; a finished product can be effectively shielded, and the packaging yield and the product stability can be improved.

The invention discloses preparation of a bionic copper-based MOF nano-enzyme and application of the bionic copper-based MOF nano-enzyme in hydroquinone detection, and the bionic copper-based MOF nano-enzyme is prepared by the following method: dissolving terephthalic acid H2BDC and L-histidine His in N, N-dimethylformamide DMF to obtain a solution A; adding copper chloride CuCl2. 2H2O into the solution A obtained by C1, and stirring to form a uniform mixed solution; carrying out hydrothermal reaction on the mixed solution obtained from C2 for a certain time, centrifuging to obtain a solid precipitate, cleaning the solid precipitate, and drying to obtain the bionic Cu / His-MOF nano-enzyme; the invention also discloses an application of the sensor in hydroquinone detection. The bionic copper-based MOF nano-enzyme has the advantages of being simple and convenient to synthesize, high in substrate affinity, high in catalytic capacity and the like, and meanwhile, a rapid, sensitive and reliable HQ detection method is provided.

The invention discloses a nickel-iron-based bimetallic organic framework catalyst and a preparation method thereof, and belongs to the field of electrochemical catalyst preparation, the preparation method comprises the following steps: step 1, dissolving a metal nickel salt in pure water, and carrying out ultrasonic dispersion to obtain a solution A; the preparation method comprises the following steps: dissolving a ferrocene dicarboxylic acid ligand in N, N-dimethylformamide to obtain a solution B; ultrasonically stirring and uniformly dispersing the solution A and the solution B to obtain a mixed solution; and 2, synthesizing the nickel-iron-based bimetallic organic framework catalyst from the mixed solution by using a hydrothermal method. The nickel-iron-based bimetal organic framework catalyst prepared by the preparation method disclosed by the invention shows good OER catalytic performance in an alkaline medium.

The invention discloses a zinc-bromine flow battery multifunctional negative electrode electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: uniformly stirring and mixing a solvent, deionized water and a cosolvent, adding an electrolyte, stirring until the electrolyte is completely dissolved, then adding a supporting electrolyte and a negative electrode additive, stirring until the supporting electrolyte and the negative electrode additive are completely dissolved, and obtaining the zinc-bromine flow battery multifunctional negative electrode electrolyte. The multifunctional negative electrode electrolyte of the zinc-bromine flow battery is obtained; the negative electrode cosolvent is dimethylformamide; and the negative electrode additive is at least one of saponin and cinnamyl aldehyde. Saponin molecules are adsorbed on the surface of the zinc electrode, and electronegative carboxyl groups of the saponin molecules form an electrostatic repulsion net in an electric double layer, so that zinc ions are forced to be uniformly dispersed, local ion concentration hot spots are eliminated, and dendritic crystal nucleation is inhibited from the source. In cinnamyl aldehyde, the strong electronegativity of oxygen atoms and the electronegativity of aldehyde oxygen are far higher than those of hydrogen, so that electrons are strongly attracted, adjacent carbon atoms are positively charged, polar adsorption sites are formed, the hydrogen evolution reaction is effectively inhibited, and the stability and the cycle life of the battery are greatly improved.

The invention discloses a method for preparing dimethyl carbonate through reaction of CO and methyl nitrite, belongs to the technical field of preparation of dimethyl carbonate, and aims to solve the problem that in the prior art, in the process of preparing dimethyl carbonate through catalysis of reaction of CO and methyl nitrite, the reaction time is short. The preparation method specifically comprises the following steps: in an inert gas atmosphere, mixing and stirring isocyanatopropyltriethoxysilane and N, N-dimethylformamide, raising the temperature of a reaction system to 50-60 DEG C, carrying out a reaction for 1-2 hours, and carrying out a reaction for 1-2 hours, so as to obtain a reaction solution; and 3-aminopropionic acid is added into the reaction system. According to the method, silicon-aluminum coating, potassium modification and 18-crown-6-ether modification are sequentially performed after a halogen-free palladium-copper catalytic system is prepared, so that the conversion rate of impurities and the chromatic value of a product are reduced, the conversion rate of methyl nitrite is effectively increased, and the service life of the catalyst is effectively prolonged.

The invention relates to the technical field of hydraulic fracturing exploitation of deep / ultra-deep oil and gas reservoirs, and discloses a gel-coated temporary plugging agent and a preparation method and application thereof.The gel-coated temporary plugging agent comprises a proppant inner core and a degradable gel shell coating the outer surface of the proppant inner core; the degradable gel shell is formed by a gel shell gelling solution, the gel shell gelling solution comprises small-molecule comonomers and a degradable cross-linking agent, and the small-molecule comonomers comprise acrylamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide the initiator is one or more of N, N-dimethylacrylamide, acrylic acid, hydroxyethyl acrylate, benzyl acrylate, 2-propyl acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and N-vinyl pyrrolidone; and the initiator is one or more of N, N-dimethylacrylamide, acrylic acid, hydroxyethyl acrylate, benzyl acrylate, 2-propyl acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and N-vinyl pyrrolidone. The gel-coated temporary plugging agent can be used for effectively plugging in a fracturing time period at high temperature / ultrahigh temperature, and the flow conductivity of fractured cracks can be enhanced by exposing an internal propping agent after the gel-coated temporary plugging agent is degraded.

The invention provides a hole transport layer precursor solution, a hole transport layer, a preparation method and application of the hole transport layer, and a perovskite cell, and belongs to the technical field of hole transport layers. The hole transport layer precursor solution comprises a self-assembled single molecule and an organic solvent; the organic solvent comprises a solvent A, a solvent B and a solvent C; the solvent A comprises more than one of a phosphate ester solvent and an alcohol ether solvent; the solvent A contains four hydrogen bond receptors; the boiling point of the solvent A is 215-290 DEG C; the solvent B comprises more than one of ethanol, isopropanol, normal propyl alcohol, butanol, ethylene glycol and N, N-dimethylformamide; the solvent C comprises more than one of ethyl acetate and normal hexane. A ternary hydrogen bond network is formed through the solvent A, the solvent B and the solvent C, the agglomeration degree of SAM molecules is remarkably reduced, and the device performance is improved.

The invention provides a preparation method of high-performance polyacrylonitrile pre-oxidized fibers, and belongs to the technical field of preparation of carbon filaments from polyacrylonitrile. The preparation method comprises the following steps: adding hydroxylated carbon nanotubes into deionized water, performing ultrasonic dispersion, adding a modifier and a catalyst, continuing ultrasonic dispersion, heating to 80-90 DEG C, performing constant-temperature reaction, fully washing with water, and drying to obtain modified carbon nanotubes; dispersing the modified carbon nanotube in an N, N '-dimethylformamide solution, adding an acrylonitrile monomer, hydroxyethyl acrylate and an initiator, copolymerizing to form a carbon nanotube / acrylonitrile copolymer, and spinning to obtain a carbon nanotube / acrylonitrile copolymer fiber; the carbon nano tube / acrylonitrile copolymer fiber is placed in a microwave treatment device, and a plurality of microwave generators are arranged in the microwave treatment device and are used for carrying out segmented pre-oxidation on the carbon nano tube / acrylonitrile copolymer fiber. The problems that an existing polyacrylonitrile fiber pre-oxidation technology is high in energy consumption and low in strength, poor in flame retardance and the like due to the difference between internal and external pre-oxidation effects can be solved.

The present invention relates to the field of environmental protection and discloses a method for removing tetracycline from water. The method uses an iron single-atom material to adsorb tetracycline in water. The iron single-atom material is prepared according to the following steps: (1) mixing ethanol, dimethylformamide, ammonia water, and water to obtain a mixed solution; (2) mixing zinc chloride, iron triacetylacetonate, and triazole with the mixed solution, stirring and reacting, to obtain an iron-doped metal-organic framework material; and (3) pyrolyzing the iron-doped metal-organic framework material at 850 to 950° C. under a protective gas atmosphere to obtain the iron single-atom material. The method provided by the present invention can be applied in complex water environments and has great significance for environmental protection. At the same time, the present invention proposes for the first time the use of an iron single-atom material as an adsorbent for adsorbing tetracycline in water, providing a new application for the iron single-atom material.

The invention provides a wide pH applicable multi-biomolecule detection MOF probe, a preparation method, a detection method and application, the probe is an MIL-53 (Fe) (at) AA (at) EZ probe, and comprises a metal organic framework MIL-53 (Fe), amino acid and enzyme; the preparation method comprises the following steps: weighing terephthalic acid and ferric chloride hexahydrate, adding into N, N-dimethylformamide, mixing and stirring, pouring the mixed solution into a stainless steel autoclave, heating and reacting, naturally cooling to room temperature, centrifugally separating a product, and washing with N, N-dimethylformamide and absolute ethyl alcohol to obtain the metal organic framework MIL-53 (Fe). The preparation method comprises the following steps: mixing a metal organic framework MIL-53 (Fe) with an amino acid solution, and carrying out ultrasonic treatment and stirring to obtain an MIL-53 (Fe) coated AA solution; the method comprises the following steps: dissolving enzyme in an MIL-53 (Fe) (at) AA solution, uniformly mixing, stirring, centrifugally separating a product, taking precipitate, and drying in vacuum to obtain the MIL-53 (Fe) (at) AA (at) EZ probe. The pH application range is wide, one-step detection can be achieved, and the method has the advantages of being rapid in reaction, high in sensitivity, low in detection limit and easy and convenient to operate.

The invention provides a sodium ion battery as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The sodium ion battery comprises a positive electrode, a negative electrode and an electrolyte, the positive electrode is a sodium-supplemented positive plate treated by a biphenyl sodium complex solution; the electrolyte comprises a NaPF6 basic electrolyte and an additive; and the additive is selected from at least one of 3-trimethylsilyl-2-oxazolidinone and N, N-dimethyl formamide. The resistance and capacity of the positive electrode are improved by supplementing sodium to the positive electrode, and the charge-discharge cycle life of the battery is prolonged by adding a polar reagent into the electrolyte to capture PF5 and remove trace water and harmful gas HF generated in charge and discharge.

The invention discloses a preparation method of a super-hydrophilic PVDF (polyvinylidene fluoride) microfiltration membrane, belongs to the technical field of filter membrane processing, and is used for solving the technical problem that the hydrophilic performance and flux of a microfiltration membrane in the prior art need to be further improved. The preparation method comprises the following steps: putting modified PVDF, acetone, N, N-dimethylformamide and an auxiliary additive into a reaction kettle, and uniformly mixing to obtain a mixed solution; the preparation method comprises the following steps: preparing modified polyolefin from modified graphene and ethylene-co-maleic anhydride, carrying out a polymerization reaction on the modified polyolefin and PVDF subjected to a dehydrogenation fluorination reaction to obtain modified PVDF, preparing a membrane from the modified PVDF, a solvent and an auxiliary additive through a phase inversion method, and further carrying out dipping treatment to obtain the PVDF / PVDF composite membrane. The hydrophilic performance and flux of the PVDF micro-filtration membrane are improved, and the mechanical performance of the PVDF micro-filtration membrane is also improved.

The invention discloses a composite hydrophobic fiber membrane based on a friction nano-generator and a preparation method of the composite hydrophobic fiber membrane. The composite hydrophobic fiber membrane is composed of a polyvinylidene fluoride nanofiber membrane, boracite particles, hydrophobic nanoparticles and polyvinylidene fluoride microspheres. The boracite particles are embedded in fibers of the polyvinylidene fluoride nanofiber membrane, and the hydrophobic nanoparticles are uniformly attached to the polyvinylidene fluoride microspheres and the polyvinylidene fluoride nanofiber; the hydrophobic nano particles are titanium dioxide nano particles or zirconium dioxide nano particles. The preparation method comprises the following steps: dispersing boracite powder and polyvinylidene fluoride powder into N, N-dimethylformamide to prepare an electrostatic spinning solution; the preparation method comprises the following steps: dispersing hydrophobic nanoparticles and polyvinylidene fluoride powder into N, N-dimethylformamide to prepare an electrostatic spraying solution; the composite hydrophobic fiber membrane is prepared through synchronous electrostatic spinning and electrostatic spraying. The problem that a modified polyvinylidene fluoride fiber membrane friction nanometer generator is low in output electrical performance in a high-humidity environment can be solved.

The invention relates to the technical field of solid-state lithium batteries, in particular to an intercalation type composite solid-state electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out ion exchange, centrifugal washing, freeze drying and other processes on sodium-based montmorillonite to obtain lithiated montmorillonite nanosheets; the preparation method comprises the following steps: adding lithiated montmorillonite nanosheets and polyethylene oxide into N, N-dimethylformamide to obtain slurry A; adding a high-molecular polymer material and lithium salt into N, N-dimethylformamide to obtain slurry B; dropwise adding the slurry A into the slurry B to obtain a precursor solution; and blade-coating the precursor solution on a glass substrate, standing, carrying out vacuum drying, and demolding to obtain the intercalation type composite solid electrolyte. The process is simple, the raw materials are easy to obtain, and the obtained electrolyte has high ionic conductivity, a wide voltage window and excellent mechanical property and flame retardant property.

The invention belongs to the technical field of multifunctional heat-conducting materials, and relates to a heat-conducting super-hydrophobic flexible film and a preparation method thereof. Comprising the following steps: adding boron nitride powder into a mixed solution of isopropanol and deionized water to obtain a boron nitride solution; ultrasonically stripping the boron nitride solution, centrifuging, washing and drying to obtain boron nitride nanosheets; the preparation method comprises the following steps: dispersing boron nitride nanosheets in a mixed solution of N, N-dimethylformamide and tetrahydrofuran, carrying out ultrasonic treatment, adding thermoplastic polyurethane, and heating and stirring until the thermoplastic polyurethane is completely dissolved to obtain a TPU / BNNSs spinning solution; preparing the TPU / BNNSs spinning solution into a fiber film through an electrostatic spinning process, drying and stripping to obtain a TPU / BNNSs composite film; siO2 is added into a PDMS solution, ultrasonic dispersion is performed to obtain a mixed solution, the mixed solution is sprayed on the surface of the TPU / BNNSs composite film, and the heat-conducting super-hydrophobic flexible film is obtained after drying and curing. The problem that the performance of a traditional heat conduction material is reduced in a complex environment is effectively solved, and the heat conduction material is suitable for application scenes needing to meet the heat dissipation and antifouling requirements at the same time.

This invention relates to a method for synthesizing iron-cobalt alloy-doped carbon nanofibers for electrocatalysis using zinc oxide etching, belonging to the technical field of electrode materials and catalysts. The preparation method includes the following steps: 1) mixing DMF (dimethylformamide), PMDA (pyromellitic dianhydride), and ODA (4,4-diaminodiphenyl ether) in a certain proportion to prepare a PAA (polyamic acid) spinning solution; 2) preparing PAA nanofibers from the PAA spinning solution using an electrostatic melt-blowing device; 3) imidizing the PAA nanofibers using a programmed temperature rise method to obtain PI nanofibers; 4) impregnating the PI nanofibers in a salt solution; 5) carbonizing the impregnated PI nanofibers with a large number of metal ions on their surface in an inert atmosphere using a certain temperature rise program to obtain iron-cobalt alloy-doped carbon nanofibers. The iron-cobalt alloy-doped carbon nanofibers prepared by this method exhibit excellent performance as an ORR / OER bifunctional electrocatalyst and have wide applications.

The invention discloses a preparation method of high-strength nanofibers for a lithium battery cellulose-based diaphragm, and belongs to the technical field of lithium battery diaphragms.The preparation method comprises the following steps that amino-terminated silane and an ethanol solution are mixed and stirred to be uniform, and hydrolysate is obtained; adding magnetic cellulose nanofibrils into the hydrolysate, carrying out stirring reaction at 60-80 DEG C for 8-10 hours, carrying out magnetic separation, and drying a separated product at 100 DEG C for 2 hours to obtain aminated magnetic cellulose nanofibrils; the preparation method comprises the following steps: adding aminated magnetic cellulose nanofibrils, an MOFs material containing amino functional groups and multi-aldehyde boric acid ester into dimethylformamide, stirring for 15-30 minutes, heating to 80 DEG C, stirring and reacting for 12 hours, carrying out suction filtration, washing a filter cake, and drying to obtain the high-strength nanofiber for the cellulose-based diaphragm of the lithium battery, and using the high-strength nanofiber for preparing the lithium battery diaphragm. And the obtained diaphragm has the advantages of high liquid absorption rate, good mechanical property and the like.

The invention relates to the technical field of fertilizers, in particular to a urea-containing slow-release coated fertilizer and a preparation method thereof. The urea-containing slow-release coated fertilizer comprises urea particles and a bio-enzyme polyurethane coating layer coated on the surfaces of the urea particles, and the bio-enzyme polyurethane coating layer comprises the following components in parts by mass: 10-20 parts of urea particles, 10-20 parts of urea particles and 10-20 parts of urea particles. Comprising the following raw materials: 20 to 25 parts of castor oil, 18 to 25 parts of castor oil-based polyester polyol, 25 to 30 parts of hydrophobic modified starch, 16 to 22 parts of diphenylmethane diisocyanate, 0.03 to 0.05 part of a catalyst, 1.5 to 2 parts of a dispersant, 1.5 to 2 parts of a high-temperature-resistant bio-enzyme, 2 to 3 parts of glycerin and 14 to 18 parts of N, N-dimethylformamide. The polyurethane coating layer material of the bio-enzyme is prepared through the cross-linked network design of the molecular level and the collaborative regulation and control of the macroscopic coating layer thickness, the balance among efficient nitrogen utilization, environmental friendliness, mechanical properties and weather resistance is achieved, and a solution with technical innovation and practical value is provided for the field of slow-release fertilizers.

The invention belongs to the technical field of thermoelectric materials and functional polymer materials, and particularly relates to thermoelectric hydrogel based on synergistic enhancement of zwitterions and a polar solvent as well as a method and application of the thermoelectric hydrogel. The thermoelectric hydrogel is obtained through the steps that a precursor solution is subjected to a polymerization reaction to form a gel matrix, then the gel matrix is soaked in a soaking solution, potassium ferricyanide / potassium ferrocyanide redox couple is introduced, and the thermoelectric hydrogel is obtained, and the precursor solution is prepared from acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide and N, N-dimethylformamide. The photoinitiator is prepared by mixing N, N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, a zwitterionic monomer [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, a cross-linking agent N, N '-methylene bisacrylamide, a photoinitiator and deionized water. The thermoelectric hydrogel prepared by the invention has high mechanical strength, high ductility and high Seebeck coefficient, and has better temperature resistance.

The invention discloses a preparation method of a beaded cobalt-doped Bi25FeO40 / BiFeO3 nanofiber wave-absorbing material, which comprises the following steps: obtaining a precursor by a standing method, and adding the precursor, bismuth nitrate, ferric nitrate and a spinning aid into a mixed solvent compounded by N, N-dimethylformamide and absolute ethyl alcohol to obtain a spinning solution; spinning the spinning solution by adopting an electrostatic spinning technology to obtain a nanofiber membrane; and finally, drying and calcining to obtain the wave-absorbing material. According to the wave-absorbing material, multiple reflection and scattering of electromagnetic waves are increased, the absorption performance of the electromagnetic waves is improved, due to the fact that a heterogeneous interface is generated after two phases are compounded, the interface polarization loss is further increased, when the thickness of the wave-absorbing material is 2.33 mm, the minimum reflection loss reaches-56.01 dB, the effective absorption frequency band width is 6.32 GHz, and the whole Ku wave band is covered.

A boron-doped graphene composite solid-state electrolyte and its preparation and application. A mixed solution of polyacrylonitrile (PAN) and N,N-dimethylformamide is prepared into a PAN porous film using electrospinning technology. A PEO casting solution is prepared by mixing boron-doped graphene, polyethylene oxide, lithium bis(trifluoromethanesulfonylimide), and acetonitrile. This solution is then cast onto the PAN porous film and, after vacuum drying, forms a composite solid-state electrolyte with polyacrylonitrile fibers as a support, polyethylene oxide as a matrix, and boron-doped graphene as a filler. The composite solid-state electrolyte prepared by the present invention has high ionic conductivity and lithium ion transference number, providing lithium batteries with good rate performance and cycle stability.

The invention belongs to the field of functional material preparation, and particularly relates to a piezoelectric coupling photo-thermal enhanced flexible photocatalytic porous structure material preparation method and a product thereof. A photo-thermal material, catalyst powder and an organic piezoelectric material polyvinylidene fluoride (PVDF) are dispersed in a N, N-dimethylformamide (DMF) solution together, granulated sugar blocks are used as a pore forming agent to prepare the photocatalytic material with a flexible photocatalytic porous structure, the coupling effect of a piezoelectric electric field and the photo-thermal effect is achieved, and the photocatalytic performance is remarkably improved.

The invention discloses an amorphous PtNi self-supporting catalytic electrode, a preparation method thereof and a direct ammonia fuel cell, and belongs to the technical field of electrode materials. According to the technical scheme, the catalytic electrode adopts foamed nickel as a conductive framework substrate, and an amorphous PtNi alloy wall-shaped array structure grows on the foamed nickel in situ; the preparation method of the catalytic electrode comprises the following steps: pretreating the foamed nickel substrate; the preparation method comprises the following steps: adding platinum diacetylacetonate, potassium hydroxide, N, N-dimethylformamide and diethylenetriamine into ethylene glycol to prepare a precursor solution; and immersing foamed nickel into the precursor solution, and carrying out in-situ growth reaction under high-temperature and high-pressure conditions to obtain the amorphous PtNi self-supporting catalytic electrode. The catalytic electrode has the beneficial effects that the catalytic electrode shows high specific activity and extremely low apparent activation energy in ammoxidation reaction, still keeps 90% of current density after continuously working for 1000 hours, and shows excellent long-term stability and durability.

The invention discloses a zinc transition metal complex and preparation and application thereof in fluorescence recognition of biomolecules, and relates to the technical field of metal organic framework materials, the chemical formula of the zinc transition metal complex is [Zn2 (L) 2 (bpe) (H2O) 2] n, and 3, 5-bis (3-carboxylic acid phenyl)-1, 2, 4-triazole, 1, 2, 4-triazole, 1, 3, 4-triazole, 1, 3, 4-triazole, 1, 3, 4-triazole, 1, 3, 4-triazole, 1, 3, 4-triazole, 1, 3, 4-triazole, 1, 3, 4-triazole, 1, 3, 4-triazole The complex material is prepared by co-dissolving 2, 2-bis (4-pyridyl) ethylene, Zn (NO3) 3.6 H2O and N, N-dimethylformamide in an aqueous solution, has excellent fluorescence performance, has the capability of specifically identifying ascorbic acid in various biomolecules, and also has relatively good anti-interference performance, excellent circularity and strong stability, and can be widely applied to the field of biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry, biochemistry and biochemistry. The method can be used for detecting ascorbic acid in water and beverages.

The present invention discloses a method for regulating spinel-type high-entropy oxides using electrospinning. The method is characterized in that metal sources, polyacrylonitrile, and dimethylformamide of varying concentrations are fully mixed to form a precursor solution, followed by preparing a spinel-type high-entropy oxide having a nanofiber structure by electrospinning. Results show that, compared to conventional methods for preparing high-entropy oxides, electrospinning facilitates a lower phase transition temperature and promotes the formation of nanoscale high-entropy oxides. Furthermore, the fibers formed are significantly affected by the precursor solution. By varying the amount of total metal added, the final fiber state of the catalyst can be effectively regulated, exhibiting significant differences in ethyl acetate catalytic oxidation activity. The preparation process is simple, enhancing the application value of high-entropy oxides in the field of heterogeneous catalysis.

The invention provides a preparation method of a graphene carbon nanofiber film for oil-water separation, and relates to the field of oil-water separation membranes, and the preparation method comprises the following steps: mixing polyacrylonitrile powder and an N, N-dimethylformamide solution to obtain an electrostatic spinning solution; spinning through an electrostatic spinning machine to obtain a polyacrylonitrile fiber membrane; coating the polyacrylonitrile fiber film with the prefabricated graphene oxide dispersion liquid to obtain a graphene oxide / polyacrylonitrile composite film; carrying out pre-oxidation, activation and carbonization treatment on the composite film to obtain a graphene carbon nanofiber film; according to the method, the waste isostatic pressing graphite which is low in price and easy to obtain is adopted as the raw material, the ammonia activation means is combined, improvement is carried out on the basis of a Hummers method, graphene oxide is prepared, resource recycling is achieved, the isostatic pressing graphite waste generated in the production process is recycled and processed into a product with a high additional value, and therefore the purposes of reducing the production cost and saving resources are achieved.

The invention belongs to the technical field of semiconductor oxide gas sensors, and particularly relates to an rGO / CuO / Li sensitive material, a preparation method thereof and application of the rGO / CuO / Li sensitive material in H2S sensors. The preparation method comprises the following steps: firstly, preparing a graphene oxide nanosheet by using an improved Hummers method, and then preparing the rGO / CuO / Li sensitive material by using copper nitrate, lithium chloride and the prepared graphene oxide nanosheet as raw materials, polyvinylpyrrolidone as a surfactant and N, N-dimethylformamide as a solvent by using a one-step solvothermal method. Under the condition of room temperature, the sensitive material shows a relatively high response value (220.1) and a relatively low detection lower limit (1ppb) on hydrogen sulfide, has good selectivity, repeatability and stability, and has a wide application prospect in trace-level hydrogen sulfide detection in the fields of industrial safety and atmosphere detection.

The invention belongs to the technical field of light-emitting hybrid materials, and particularly discloses a preparation method and application of an efficient blue light emitting hybrid material. The preparation method comprises the following steps: dispersing cuprous halide, triphenylphosphine (tpp) and tetraethylammonium halide in N, N-dimethylformamide (DMF) according to a molar ratio of 1: 1: 1 to form a uniform solution, and performing ultrasonic treatment at room temperature to generate luminescent powder; and washing, centrifuging and drying in vacuum to obtain the hybrid material. The highest photoluminescence quantum yield is up to 70%, and the luminescence mechanism is thermally activated delayed fluorescence. The material can be used for a white light LED (CIE coordinate (0.33, 0.33)) and an X-ray scintillator (the light yield is 32537 photons / MeV, and the spatial resolution is 20lpmm <-1 >), and has the characteristics of simple preparation and excellent performance.

The invention discloses a preparation method of a Zr-BTB MOL-coated MgNi composite solid hydrogen storage material with a core-shell structure. The preparation method comprises the following steps: preparing a Zr-BTB MOL-coated MgNi composite solid hydrogen storage material; the preparation method comprises the following steps: step 1, sequentially weighing ZrCl4, 1, 3, 5-tri (4-carboxyl phenyl) benzene (C27H18O6) and N, N-dimethylformamide (DMF) in a transparent glass bottle; obtaining a mixed solution; carrying out ultrasonic treatment on the mixed solution, sequentially adding formic acid and distilled water, sealing with tinfoil, putting into a drying oven, finally cooling to room temperature, respectively carrying out centrifugal washing with DMF (Dimethyl Formamide) and ethanol, and controlling the addition amount of medicines in the preparation process to obtain different types of Zr-BTB MOL; and 2, the Zr-BTB MOL and Mg-Ni are mixed and subjected to ball milling, and the Zr-BTB-coated MgNi composite solid hydrogen storage material is obtained. According to the method, the samples are effectively prevented from being gathered in the hydrogen absorption and dehydrogenation processes, and the stability of the Zr-BTBat-MgNi composite material in the hydrogenation / dehydrogenation cycle process is improved.