24 results about "N dimethylformamide" patented technology

The invention discloses lithium-free high-heat-resistance ceramic pug and a preparation method thereof, and relates to the technical field of ceramic materials. When the lithium-free high-heat-resistance ceramic pug is prepared, aluminum oxide reacts with 3-(2, 3-epoxypropoxy) propyltrimethoxysilane to prepare pre-modified aluminum oxide; reacting the pre-modified aluminum oxide with starch to obtain modified aluminum oxide; mixing ethyl acetoacetate, isopropanol, zirconium oxychloride, aluminum sec-butoxide, polyvinylpyrrolidone and N-N dimethylformamide to prepare a spinning solution, performing electrostatic spinning, and then immersing the spinning solution into the yttrium oxide sol to prepare aluminum oxide-zirconium oxide-yttrium oxide composite fibers; stirring and mixing the modified aluminum oxide, talc, aluminum oxide-zirconium oxide-yttrium oxide fibers, hydroxypropyl methyl cellulose, glycerol, oleic acid, polyethylene glycol and water, and performing vacuum pugging to obtain the lithium-free high-heat-resistance ceramic pug. The lithium-free high-heat-resistance ceramic pug prepared by the invention has good thermal shock resistance and bending strength after being sintered.

A high-entropy nano-array for electrocatalytic nitrate reduction coupling waste plastic conversion is prepared by the following method: (1) immerse the nickel foam into a hydrochloric acid solution to remove the surface oxide layer and oil stains, rinse with deionized water / ethanol three times, and dry for subsequent use; (2) solid powders of sodium chloropalladate, platinum acetylacetate, nickel chloride hexahydrate, copper chloride dihydrate, silver trifluoroacetate and tungsten hexacarbonyl are poured into an N-N dimethylformamide solution, ultrasonic is used to dissolve the solid powders, then glacial acetic acid and the treated nickel foam are added to the above solution, and after ultrasonic, heating in an oven is carried out, after the reaction is completed, water and ethanol solution are used for alternate washing, and drying is carried out, and the high-entropy nano-array catalyst is obtained. A preparation method of a high-entropy nano-array for electrocatalytic nitrate reduction coupling waste plastic conversion is provided. The high-entropy nano-array has excellent electrocatalytic activity and stability.

The application discloses a lithium-free high-heat-resistant ceramic mud and a preparation method thereof, and relates to the technical field of ceramic materials. In the preparation of the lithium-free high-heat-resistant ceramic mud, alumina is reacted with 3-(2,3-epoxypropoxy) propyl trimethoxysilane to obtain pre-modified alumina; the pre-modified alumina is reacted with starch to obtain modified alumina; ethyl acetoacetate, isopropyl alcohol, zirconium oxychloride, aluminum sec-butoxide, polyvinylpyrrolidone and N-N dimethylformamide are mixed to form a spinning solution, the spinning solution is electrospun, and then immersed in yttrium oxide sol to obtain alumina-zirconia-yttria composite fibers; the modified alumina, talc, alumina-zirconia-yttria fibers, hydroxypropyl methyl cellulose, glycerol, oleic acid, polyethylene glycol and water are stirred and mixed, and vacuum pugging is carried out to obtain the lithium-free high-heat-resistant ceramic mud. The lithium-free high-heat-resistant ceramic mud prepared by the application has good thermal shock resistance and bending strength after sintering.

The application discloses a kind of methods for synthesizing MOFs / cellulose aerogel composite electrode material and its electrocatalytic oxygen evolution application, belong to electrocatalytic functional material preparation process technical field.It is specifically disclosed a kind of preparation method of Cr-NiFe MOF / cellulose aerogel electrode material, including the following steps, Cr source, Ni source and Fe source are dissolved in deionized water and are added to the solution of N,N dimethylformamide containing terephthalic acid, after stirring uniformly, transfer to Teflon reaction kettle, 160 DEG C is reacted 24h and obtains Cr-NiFe MOF;Subsequently, the obtained Cr-NiFe MOF powder is dispersed in carboxymethyl cellulose solution, a certain amount of acetone is added, after mixing uniformly at 80 DEG C, liquid nitrogen freezing is carried out, then 48h of freeze drying can be obtained Cr-NiFe MOF / cellulose aerogel composite material.This composite electrode material when used as electrocatalytic oxygen evolution material, show superior activity and extremely high stability.Especially, at 10mA·cm-2, show 235mV of low overpotential, tafel slope is 53.7mV·dec-1, stability is more than 210h, is one of the best aerogel composite materials of catalytic performance at present, has good application prospect in catalysis and energy conversion field.

The invention relates to the field of electrocatalysts, in particular to a Ru t-ZrO2 / C electrocatalyst and a preparation method thereof.The preparation method includes the steps that zirconium tetrachloride, terephthalic acid, N, N-dimethylformamide and formic acid are put into a polytetrafluoroethylene lining to be subjected to a solvothermal reaction, and after the temperature is cooled to the room temperature, centrifugal washing and vacuum drying are conducted through DMF and methyl alcohol to obtain UiO-66 powder; secondly, dispersing the UiO-66 powder in methanol, adding ruthenium trichloride, stirring, centrifugally washing with methanol, and drying in vacuum to obtain a precursor Ru-UiO-66; and finally, sintering the precursor Ru (at) UiO-66 in a tubular furnace under an argon condition to obtain the Ru (at) t-ZrO2 / C electrocatalyst. According to the present invention, the strong interaction between the Zr-Ru bimetallic sites is combined with the strong conductive structure formed by ZrO2 and the carbon substrate, such that the prepared electrocatalyst has characteristics of low loading amount of the noble metal Ru cluster, excellent structure stability, high active site utilization rate, and efficient electron transfer with the MOFs carrier so as to show the efficient acid-base system electrocatalytic property;

The invention discloses a preparation method and application of Zr-MOF modified magnetic straw biochar filler, and belongs to the technical field of water pollution treatment and ecological remediation, the method comprises the following steps: adding powdery straw into a solution of ferrous ions and ferric ions, stirring and performing ultrasonic treatment, and performing high-temperature pyrolysis on the dried powdery straw to prepare magnetic biochar; zirconium salt, the magnetic straw biochar and terephthalic acid are added into an N, N-dimethylformamide solution, the mixture is stirred and subjected to ultrasonic treatment, then the mixture is put into a polytetrafluoroethylene reaction kettle for a reaction, after the reaction is finished, N, N-dimethylformamide and absolute ethyl alcohol are used for cleaning, and after drying, the Zr-MOF modified magnetic straw biochar filler is obtained. Plant straw is used as a biochar raw material, biochar is modified through Zr-MOF and ferric salt, the porous structure and the specific surface area of the Zr-MOF modified magnetic straw biochar filler can be remarkably improved, the structural stability and the adsorption activity of the filler can be enhanced, refractory organic pollutants in a water body are efficiently removed, and soil pollutants are adsorbed and fixed.

The invention belongs to the technical field of plastic materials, and particularly relates to a plastic prosthetic material and a preparation method thereof. The preparation method comprises the following steps: (1) pretreating carbon fibers to obtain pretreated carbon fibers; (2) modifying the carbon fiber by using KH792 to obtain silane modified carbon fiber; (3) mixing the silane carbon fiber with N, N-dimethylformamide, continuously adding polyethylene glycol diacetate and a condensing agent, carrying out a heating reaction, and carrying out rotary evaporation to remove N, N-dimethylformamide so as to obtain modified carbon fiber; and (4) uniformly mixing the PEEK powder, the modified carbon fibers and the carboxylated carbon nanotubes, and carrying out mold pressing to obtain the prosthetic material for the plastic surgery department. The prosthetic material for the plastic surgery department is safe to use, high in mechanical property and good in fatigue resistance.

The application discloses a natural plant-based surfactant for high-temperature-resistant synthetic drilling fluid and a preparation method thereof. A raw material composition comprises natural organic matter, an acid-binding agent, N,N dimethylformamide and a compound containing a long-chain acyl chloride or amine-based monomer. The natural plant-based surfactant for high-temperature-resistant synthetic drilling fluid comprises a compound with a terpene cyclic skeleton, a lipophilic group and a hydrophilic group, wherein the molecular structure of the terpene cyclic skeleton has a stacking constant P greater than 1. The technical scheme of the application obtains a rigid surfactant based on a natural terpene polycyclic skeleton, controls the aggregation and self-assembly behavior of the surfactant at an oil-water interface, and makes the system easy to form a water-in-oil emulsion system. The surfactant can be protected at a high temperature, can still maintain good surface activity at a higher temperature, can maintain the use of the drilling fluid system in a deep reservoir, and thus the purposes of preventing well leakage pollution, well wall collapse and safe drilling are achieved.

The invention provides an anti-adhesion coating suitable for low-medium-high viscosity liquid as well as a preparation method and application of the anti-adhesion coating. The preparation method comprises the following steps: taking polyvinylidene fluoride (PVDF) as a main component, doping two types of modified SiO2 particles as a filler, taking amine-terminated polyether D230 as a molecular bridging substance, taking a mixed solution of N-N dimethyl formamide (DMF) and N-methyl-2-pyrrolidone (NMP) as a solvent, combining a sol-gel method with a spraying process, and combining a non-solvent induced phase separation (NIPS) strategy to obtain the anti-adhesion coating. According to the preparation method, the viscosity threshold value of a traditional coating capable of repelling liquid is broken through through multi-scale structural design, mutual repulsion between PVDF and modified SiO2 particles which are weak in polarity is converted into stable C-N-F bonding effect through introduction of an active amino-terminated D230 molecular bridge material, the bottleneck that a traditional system structure is unstable is broken through, and the preparation method is suitable for large-scale preparation of PVDF / modified SiO2 / PVDF composite coating. The prepared broad-spectrum anti-adhesion coating has broad-spectrum anti-adhesion range, mechanical stability and chemical durability, and can be widely applied to a plurality of fields, especially the occasions of filling, storage, mixing, conveying and the like related to high-viscosity liquid.

The application discloses a hyperbranched magnetic modified MOFs-based composite material and a preparation method and application thereof, and the preparation steps of the hyperbranched magnetic modified MOFs-based composite material include the following steps: preparing a magnetic Fe3O4 magnetic material or purchasing a commercially available one; preparing a Zn-MOF material by using sodium hydroxide, trimesic acid, N-N dimethylformamide, ethanol and zinc acetate dihydrate; preparing a carboxyl-terminated hyperbranched polymer by using diethanolamine, methanol, methyl acrylate, trimethylolpropane, p-toluene sulfonic acid and maleic anhydride; and reacting the magnetic Fe3O4 with the Zn-MOF and the carboxyl-terminated hyperbranched polymer to obtain the hyperbranched magnetic modified MOFs-based composite material. The hyperbranched magnetic modified MOFs-based composite material prepared by using the application can remove the chroma in water, can realize the effect of low dosage and high removal rate, and has stable recycling regeneration effect and high removal efficiency.

The invention discloses a method for detecting benzene and 1, 2-dichloroethane in activated carbon and application of the method, aiming at solving the problem that a method for detecting the benzene and the 1, 2-dichloroethane in the activated carbon is lacked at present, and realizing qualitative or quantitative detection of a residual solvent of the benzene or the 1, 2-dichloroethane in the activated carbon so as to ensure the quality of the activated carbon. And the safety of the injection production process is improved. N, N-dimethylformamide or dimethyl sulfoxide is selected as the solvent, so that the toxicity of the test solvent is remarkably reduced. The activated carbon has high adsorption activity on benzene, toluene or ethylbenzene or xylene is used as an internal standard substance for benzene content determination, the desorption effect of N, N-dimethylformamide or dimethyl sulfoxide on activated carbon of different sources is corrected through an internal standard, and the accuracy of a benzene content result can be obviously improved. A headspace sampling method is selected, a mixed solvent of water and N, N-dimethylformamide or dimethyl sulfoxide is used, and the sensitivity of the method is improved through azeotropy of the mixed solvent.

The invention discloses a rhenium recovery functional material and a preparation method thereof. The preparation method comprises the following steps: weighing 10-50g of chlorine balls in a 100ml beaker, then adding 10-40g of N, N-dimethylformamide, ensuring that the chlorine balls are completely immersed, and immersing for 2-4 hours; weighing an N-ethyl thiourea aminating agent according to a preset proportion of the available chlorine content to amine, and putting the N-ethyl thiourea aminating agent into a constant-pressure separating funnel; heating the reaction system in a water bath, dropwise adding an N-ethyl thiourea aminating agent within 2-3 hours, dropwise adding a sodium hydroxide solution into the reaction bottle after the aminating agent is dropwise added, adjusting the pH value of the reaction system to 5-12, and continuing to react for 6-14 hours; after the reaction is finished, repeatedly cleaning the resin by using deionized water until the cleaned solution is neutral, and removing residual impurities and reaction byproducts; drying in a vacuum environment to obtain a dried rhenium recovery functional material; the method can solve the problem of insufficient desorption capability when ammonium perrhenate is recovered by using ammonia water.

The application belongs to the technical field of polymer materials, and discloses a method for preparing a polyamide nanofiltration membrane based on a non-reactive ionic liquid, which comprises the following steps: preparation of a substrate PES membrane: 16wt% of polyethersulfone PES, 16wt% of polyethylene glycol PEG, and 68wt% of N-N dimethylformamide DMF are weighed and placed in a round-bottom flask, stirred in a water bath, and left to stand at the same temperature to remove air bubbles, then, the casting solution is cast on a glass plate with a steel knife and immersed in ultrapure water to remove residual solvent; preparation of a polyamide PA membrane: interfacial polymerization is performed on the PES membrane by using an aqueous phase solution containing piperazine PIP and 1-butyl-3-methylimidazole chloride and an oil phase solution containing TMC to synthesize a polyamide active layer. The application provides a new perspective for the regulation of monomer diffusion and reaction in the interfacial polymerization process, and has important application potential in the preparation of high-performance polyamide composite membranes.

The application relates to an electrode fiber, in particular to an electroluminescent bifunctional electrode fiber and application of the electrode fiber in preparation of an electroluminescent device, and belongs to the technical field of electroluminescent electronic devices. The bifunctional electrode fiber is prepared by the following method: taking a zinc wire with a diameter of 0.3-2.0 mm as a core wire, adopting a spinning solution to electrostatically spin on the surface of the zinc wire to form a nanofiber layer, and preparing the bifunctional electrode fiber; the spinning solution contains 15-25% of thermoplastic polyurethane, 5-20% of zinc copper sulfide, 2-10% of PDMS, and the rest is a solvent composed of N-N dimethylformamide and tetrahydrofuran. The application integrates two functions on one electrode fiber, can easily prepare a fibrous zinc ion battery and a fibrous electroluminescent device by changing the formula of an electrolyte, and can also introduce a third fiber into the fibrous zinc ion battery to endow the battery with the electroluminescent capability.

The application discloses a quasi-two-dimensional perovskite light-emitting film based on atmosphere regulation and a preparation method thereof, and belongs to the field of luminescent materials and nanotechnology. The preparation method of the quasi-two-dimensional perovskite light-emitting film comprises the following steps: dissolving macromolecular cationic organic matter, monovalent cation halide and divalent cation halide in a polar organic solvent to obtain a precursor solution; and placing the precursor solution in an environment containing a special atmosphere to perform two-stage spin coating to obtain the quasi-two-dimensional perovskite light-emitting film. The special atmosphere is an atmosphere formed by volatilization of one or more of dimethyl sulfoxide, N-N dimethylformamide, isopropyl alcohol, ethyl acetate, chlorobenzene and toluene. According to the application, the composition ratio of the atmosphere environment can be regulated to realize light emission in the range of 380 nm-800 nm visible light-near infrared, and the quasi-two-dimensional perovskite film with excellent light-emitting performance, high environmental stability and high phase purity can be rapidly obtained without annealing and anti-solvent treatment.

The invention discloses a CFNB metal-free redox catalyst and a preparation method and application thereof, and belongs to the technical field of electrochemical catalytic materials, the CFNB metal-free redox catalyst is composed of a carbon material co-doped with three heterogeneous elements of fluorine, nitrogen and boron, and has a three-dimensional cross-linked nano network structure; the preparation method comprises the following steps: jointly dissolving the polyalcohol ether borate, the polydopamine and the polyvinylidene fluoride hexafluoropropylene copolymer in N-N dimethylformamide according to a mass ratio of (1-5): (1-5): (1-5), and stirring until the materials are uniformly mixed; the obtained mixed solution is subjected to electrostatic spinning, the spinning voltage is 12-18 kV, the receiving distance is 15-20 cm, the flow velocity is 0.05-5 mL / h, and an aluminum foil serves as a receiving base material; the obtained spinning product is subjected to carbonization treatment in an inert atmosphere, calcination is conducted for 1-4 h at the calcination temperature of 700-950 DEG C, and the CFNB metal-free oxygen reduction catalyst is obtained and has better catalytic activity and stability.

The invention relates to the technical field of PET polyester, in particular to an MOF catalyst for synthesizing PET and a preparation method of the MOF catalyst, the molecular expression is Sb-SBME-UiO-66, and SBME is thiobenzyl ether. The preparation method comprises the following steps: dispersing zinc tetrachloride and terephthalic acid into a first mixed solution of N-N dimethyl amide and ethylene glycol for reaction, and centrifuging after the reaction to obtain a white precipitate; the white precipitate is washed, and a UiO-66 matrix is obtained; the preparation method comprises the following steps: mixing ethylene glycol antimony and thiobenzyl methyl ether in ethylene glycol, reacting, and centrifuging to obtain an antimony precursor; and mixing and dispersing the UiO-66 matrix and the antimony precursor in a second mixed solution of N-N dimethylformamide and ethylene glycol, stirring to activate the UiO-66 matrix and the antimony precursor, heating, and continuously reacting to obtain the MOF catalyst. The MOF catalyst for synthesizing PET and the preparation method of the MOF catalyst aim at solving the problem that a catalyst for synthesizing PET is poor in catalytic activity and thermal stability.

A graphene-coated V3S4@NC material and a preparation method therefor and the use thereof. The material is composed of V3S4@NC and graphene coated on the surface of V3S4@NC, wherein V3S4@NC is of a core-shell structured nanofiber composite material with a V3S4 core and an NC shell. The method comprises the following steps: step I: adding a sulfur powder, vanadyl acetylacetonate (VO(acac)2), polyacrylonitrile (PAN), and graphene oxide to N-N dimethylformamide (DMF), stirring same for 12 h, followed by ultrasonic oscillation to obtain a mixed solution; step II: filling a syringe with the mixed solution obtained in step I, performing electrostatic spinning at a flow rate of 0.4 mL / h under a voltage of 18 kV, and collecting a product, so as to obtain a precursor; and step III: placing the collected precursor in a protective atmosphere, and annealing same at 800 ºC for 3 h to obtain a graphene-coated V3S4@NC material. The product can enable the reduced transport distance of sodium ions, and improvement of the electrochemical performance thereof.

The invention relates to the technical field of hydrogen storage materials, in particular to a bimetallic MOF / activated carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: weighing pretreated activated carbon, adding the activated carbon into N, N-dimethylformamide, and carrying out ultrasonic dispersion to obtain an activated carbon dispersion liquid; adding Cu-Zr-MOF into the activated carbon dispersion liquid, performing ultrasonic dissolution, then transferring the solution into a stainless steel reaction kettle with a polytetrafluoroethylene lining, performing continuous reaction for 24-48 hours at 120-150 DEG C, performing natural cooling to room temperature, performing suction filtration, washing an obtained solid product with N, N-dimethylformamide and ethanol respectively, and then drying the solid product at 60-80 DEG C for 6-8 hours to obtain the Cu-Zr-MOF / activated carbon composite material. Through double-metal cooperation, a hierarchical pore structure and a composite carrier effect, the hydrogen storage capacity, the adsorption kinetics and the cycling stability show advantages, and the hydrogen storage material is particularly suitable for application scenes needing rapid hydrogen charging and discharging or low temperature and high pressure.

The invention discloses a hydrated salt composite phase change film, a preparation method thereof and application of the hydrated salt composite phase change film in thermal management of electronic devices. A hydrated salt composite phase change material (CPCM) is prepared from sodium acetate trihydrate (SAT) / porous expanded graphite (EG) through a vacuum impregnation method. Then, casting a wet film containing polyvinylidene fluoride (PVDF) and N-N dimethylformamide (DMF) in a certain proportion through a scraper and a roller press; the hydrated salt composite phase change film is obtained by immersing a wet film into a deionized water bath and dissolving the wet film with a solvent, the hydrated salt composite phase change film evacuates heat of an electronic device through hydrated salt phase change heat absorption and expanded graphite heat conduction, and the hydrated salt composite phase change film has temperature response flexibility in the phase change process, interface thermal resistance is reduced, and heat dissipation efficiency is improved.

The application belongs to the technical field of plastic materials, and particularly relates to a prosthesis material for orthopedics and a preparation method thereof. The preparation method comprises the following steps: (1) pretreating carbon fibers to obtain pretreated carbon fibers; (2) modifying the carbon fibers by using KH792 to obtain silane-modified carbon fibers; (3) mixing the silane-modified carbon fibers and N,N dimethylformamide, continuously adding polyethylene glycol diacetate and a condensing agent, heating and reacting, and removing the N,N dimethylformamide by rotary evaporation to obtain modified carbon fibers; and (4) uniformly mixing PEEK powder, the modified carbon fibers and carboxylated carbon nanotubes, and performing mold pressing to obtain the prosthesis material for orthopedics. The prosthesis material for orthopedics prepared by the application is safe to use, has high mechanical properties and good fatigue resistance.

The application discloses a near-infrared fluorescent probe, a preparation method and application thereof, and has the structure shown in compound 1. The fluorescent probe prepared by the preparation method has strong ultraviolet in the near-infrared region; and can rapidly and efficiently detect cysteine in a mixed solution formed by N,N dimethylformamide and water and generate a new absorption peak at 750 nm. The fluorescent probe prepared by the preparation method has strong fluorescence in the near-infrared region; and can rapidly and efficiently detect cysteine in a mixed solution formed by N,N dimethylformamide and water and generate a new absorption peak at 750 nm.

The application discloses a preparation method of a high-stability manganese oxide positive electrode of a zinc ion battery, and belongs to the technical field of novel battery material preparation. The method comprises the following steps: dissolving potassium permanganate and a divalent manganese salt in a mixed solution of water and N,N dimethylformamide; the obtained mixed solution is heated, stirred and refluxed; after the reaction is completed, the mixed solution is filtered and washed with water and alcohol, and drying is not needed; the mixed solution is transferred into an acidic solution, and the next step of reaction is performed under the assistance of ultrasonic waves; after the reaction is completed, the mixed solution is washed with water and alcohol, and vacuum drying is performed; and a manganese oxide material pre-embedded with hydrated protons is obtained. The manganese oxide material prepared by the method has a small molar mass / size of the pre-embedded hydrated protons, a formed interlayer hydrogen bond network and a strong O-H bond formed with a metal layer, and thus has high rate performance and excellent cycle stability, and can be popularized and applied in the field of zinc ion battery electrode materials.

The application discloses a method for detecting rhodamine B by using solvent-induced fluorescence enhancement. The method synthesizes up-conversion nanoparticles NaYF4:20%Yb,2%Er@NaYF4:30%Nd (UCNPs) with small particle size, uniform size and good water solubility by a thermal decomposition method, and the up-conversion nanoparticles can emit 541 nm fluorescence under the excitation of 808 nm light and the fluorescence is absorbed by rhodamine B. A simple, stable, rapid and high-sensitivity method for detecting rhodamine B based on fluorescence enhancement of the up-conversion nanoparticles is established by changing the medium environment of the UCNPs by using a mixed solvent of N,N dimethylformamide and water. The method is simple in operation, high in selectivity and fast in response speed, and is successfully applied to tomato sauce actual samples.