423results about "Copper oxides/halides" patented technology

The invention discloses a preparation method of a metal-based nano-enzyme and application of the metal-based nano-enzyme in treatment of periodontitis, the nano-enzyme combines two metal bases, and the nano-enzyme exerts anti-inflammatory, vascularization and osteogenesis effects through advantage complementation to treat periodontitis. The nano-enzyme for treating periodontitis has excellent anti-oxidation / anti-inflammatory performance, exerts an ROS elimination function in a specific environment, responds to a periodontitis pathology microenvironment to release metal ions, exerts a growth factor-like function of the metal ions and realizes repair of blood vessels and bone tissues. The multifunctional nano material has the advantages of simple process, low cost, high activity and the like, and has a good treatment effect on periodontitis.

The invention relates to the field of gas sensors, and discloses a hydrogen sulfide gas sensor and a method for detecting the concentration of hydrogen sulfide in gas. The hydrogen sulfide gas sensor comprises a substrate and a gas sensitive material, a cavity is formed in the substrate, the gas-sensitive material is located above the cavity, and the two ends of the gas-sensitive material are connected with the gold electrodes on the substrate; the gas sensitive material comprises graphene fiber and metal oxide loaded on the graphene fiber. The metal oxide is selected from one or more than two of oxides of Zn, Cd, Cu, Ni, Pd, Pt, Co, Ir, Fe, Mn, Cr, Mo, W, V, Ti, Mg and Al; the specific surface area of the gas sensitive material is 80-150m < 2 > / g; the loading capacity of the metal oxide is 0.05 to 5 weight percent. The hydrogen sulfide gas sensor can be self-heated, has high sensitivity to hydrogen sulfide gas, and is suitable for being applied to the field of gas monitoring.

The invention belongs to the field of resource regeneration, and particularly relates to a method for separating and recycling copper, indium, gallium and selenium from a waste solar thin film battery. According to the method, the waste solar thin film cells are subjected to oxidizing roasting, deep eutectic leaching and extraction and reverse extraction, and high-quality conversion and purification of all valuable elements in the waste solar thin film cells to oxides of the valuable elements are achieved. According to the method, the process route is simple, high-selectivity extraction of indium is achieved through the synergistic effect of the deep eutectic solvent and P204, and meanwhile effective recovery of valuable elements such as copper and selenium is achieved. The recovered and prepared oxide can be widely applied to strategic emerging industries such as semiconductors, photovoltaics, aerospace, military and the like.

A nanocomposite having ionic conductivity and having the general formula CuO·MgAl2O4 wherein: copper oxide (CuO) is present in an amount of from about 5 to about 15 weight percent (wt. %) of the total weight of the nanocomposite; and, CuO is present as a monoclinic crystal phase within the nanocomposite, as determined by X-ray diffraction (XRD).

The invention discloses a method for preparing an iridescent cuprous oxide nanoparticle photonic crystal, which is characterized in that monodisperse spherical particles are obtained through a method for controlling the crystal form of cuprous oxide nanoparticles, so that the monodisperse spherical particles can be self-assembled into a three-dimensional ordered photonic crystal structure, thereby generating gorgeous iridescent color. The invention relates to a method for preparing iridescent cuprous oxide nanoparticle photonic crystals, which adopts monodisperse spherical cuprous oxide nanoparticles with a polycrystalline structure as a structural unit, and is synthesized by the following steps: 1) dissolving high-molecular-weight polyvinylpyrrolidone, trisodium citrate and soluble bivalent copper salt in a mixed solvent of polyethylene glycol and water; stirring until the materials are completely dissolved; (2) dropwise adding a strong alkali solution into the solution prepared in the step (1), vigorously stirring, quickly adding a reducing agent, and stopping after the reaction is completed under stirring; and 3) separating a reaction product, washing and drying in vacuum.

The invention provides a preparation method of a nanometer copper oxide sheet, and relates to the technical field of metal powder nanometer material preparation. The method comprises the following steps: preparing a copper salt into a copper precursor aqueous solution containing a surfactant, and preparing alkali into an alkaline solution; the copper precursor aqueous solution containing the surfactant is converted into copper micro-nano aerosol containing the surfactant, and the alkaline solution is converted into micro-nano aerosol containing alkali; the preparation method comprises the following steps: carrying out gas-phase confinement microcell mixing pre-reaction on the copper micro-nano aerosol containing the surfactant and the alkali-containing micro-nano aerosol to obtain a copper-alkali mixed solution, transferring the copper-alkali mixed solution into a polytetrafluoroethylene reaction kettle, and carrying out hydrothermal reaction to obtain a nano-particle solution containing a copper compound; and carrying out solid-liquid separation, washing, drying and roasting on the nano-particle solution containing the copper compound to obtain the nano copper oxide sheet. According to the invention, on the basis of improving the preparation efficiency of the nanometer copper oxide sheet, the preparation cost of the nanometer copper oxide sheet is reduced.

The invention provides a preparation method of coralline copper oxide powder, a preparation method of coralline copper powder, the coralline copper oxide powder and the coralline copper powder, and relates to the technical field of powder materials. The preparation method of the coralline copper oxide powder comprises the following steps: preparing a copper salt aqueous solution and a precipitant aqueous solution; converting the copper salt aqueous solution into copper salt aerosol, converting the precipitant aqueous solution into precipitant aerosol, and mixing the copper salt aerosol and the precipitant aerosol for gas-liquid phase reaction to obtain a suspension containing a copper compound; carrying out homogeneous hydrothermal reaction on the suspension to obtain a reacted solid substance so as to obtain copper precursor powder; and roasting the copper precursor powder to obtain the coralline copper oxide powder. The preparation cost of the coralline copper oxide powder and the copper powder can be reduced.

The invention discloses a preparation method and application of octahedral cuprous oxide containing defects, and belongs to the technical field of material preparation. In order to solve the problems that in existing cuprous oxide preparation, a defect structure is difficult to accurately regulate and control, and the crystal form uniformity is insufficient, the method comprises the steps that a copper source solution, a glucose solution, a sodium citrate solution and an ammonium fluoride solution with specific concentrations are mixed according to the volume ratio, the pH is adjusted to 10.5-11, then a hydrothermal reaction is conducted, and a target product is obtained through centrifugation, filtration, washing and drying. The method comprises the following specific steps: mixing solutions, reacting in a high-pressure reaction kettle at 140-165 DEG C for 4-6 hours, and realizing octahedral crystal form construction and defect regulation and control by controlling the raw material ratio and reaction conditions. The preparation method is simple in process and high in controllability, and the prepared octahedral cuprous oxide containing defects can serve as a catalyst to be applied to the fields of catalytic decomposition of ammonium perchlorate and the like and has good industrial application prospects.

The invention belongs to the technical field of hepatopathy treatment drugs, and particularly relates to an anti-inflammatory and anti-oxidative stress nano-enzyme Cu5.4O atCNDs with cascade enzyme activity and application of the nano-enzyme Cu5.4O atCNDs. The nano-enzyme Cu5.4O-coated CNDs is prepared by the following steps: dissolving CuCl2 in a carbon dot aqueous solution, reacting for 10-12 minutes at the temperature of 75-80 DEG C, then adding an L-ascorbic acid aqueous solution, regulating the pH value to 7.0-8.0 by using a NaOH solution, reacting for 10-12 hours at the temperature of 75-80 DEG C, after the reaction is finished, centrifuging to remove precipitates, dialyzing supernate, and freeze-drying to obtain the Cu5.4O-coated CNDs. Research results of the invention prove that the nano-enzyme Cu5.4O-coated CNDs has the potential of treating various acute liver injury diseases, and is an intervention strategy with a good clinical application prospect.

The invention discloses a surface oxidation monatomic nano-alloy catalyst as well as a preparation method and application thereof, and belongs to the technical field of advanced nano-energy materials and electro-catalysis. A surface-oxidized monatomic nano-alloy catalyst comprises a hydroxylated carbon nanotube carrier and bimetallic nano-alloy particles loaded on the hydroxylated carbon nanotube carrier, in the bimetallic nano-alloy particles, non-noble metal elements are dispersed in noble metal nano-particles in a monatomic form, the size of the bimetallic nano-alloy particles is 3-4 nm, and the surface-oxidized monatomic nano-alloy catalyst is prepared from a surface-oxidized monatomic nano-alloy catalyst. An oxide layer with the thickness of 0.3-0.6 nm is arranged on the surface of the bimetallic nano-alloy particle; the loading amount of the noble metal is 5-15wt%. Ruthenium and other non-noble metal elements are alloyed and anchored on the carbon material substrate, the conductivity of the catalyst can be greatly improved, the size of alloy particles is accurately controlled within the range of 3-4 nm, active sites can be exposed to the maximum extent, and structural stability is considered.

The invention discloses a solid oxide electrolytic tank for high-temperature electrolysis of carbon dioxide and a preparation method. The electrolytic tank comprises a solid electrolyte substrate, an isolation layer located on one side of the solid electrolyte substrate, a cathode located on the isolation layer and an anode located on the other side of the solid electrolyte substrate. And the material of the solid electrolyte substrate is La < 0.9 > Sr < 0.1 > Ga < 0.8 > Mg < 0.2 > O < 3 > (LSGM). And the material of the isolating layer is Ce < 0.8 > Sm < 0.2 > O < 1.9 > (SDC). The cathode material is a compound composed of Sr2Fe1. 5Mo0. 5O6 (SFM) and Ce0. 8Sm0. 2O1. 9 (SDC), and La0. 8Sr0. 2Cr0. 5Mn0. 5O3 (LSCM) nano particles or CuO nano particles are attached to the cathode material. The anode material is a compound composed of La < 0.7 > Sr < 0.3 > Co < 0.2 > Fe < 0.8 > O < 3 > (LSCF) and Ce < 0.8 > Sm < 0.2 > O < 1.9 > (SDC). The nanoparticles can effectively increase the specific surface area of an electrode, generate additional active sites, provide enough reaction interfaces and gas diffusion channels, effectively promote the reduction reaction of CO2, and contribute to reducing the local carbon concentration and reducing the occurrence rate of carbon deposition.

The invention relates to a copper-cobalt modified photocathode and preparation thereof and application of the copper-cobalt modified photocathode in photoelectrocatalysis of urea synthesis, and belongs to the technical field of electrode materials, a copper-cobalt double-monatomic coating layer is constructed on the surface of a Cu2O nanorod, the copper-cobalt modified photocathode material Cu2O coated Cu1Co1 / NC is prepared, the corrosion resistance of the Cu2O photocathode is improved, and meanwhile, the photocathode material Cu2O coated Cu1Co1 / NC can be applied to photoelectrocatalysis of urea synthesis. And the double active centers are also utilized to improve the efficiency of preparing urea by catalyzing CO2 / NO3 <-> reduction by the Cu2O photocathode.

The invention belongs to the technical field of nano material preparation, and provides a preparation method and application of a rare earth ytterbium-doped copper oxide nano material. The method comprises the following steps: dissolving rare earth ytterbium salt, copper salt and a surfactant in a solvent, and uniformly stirring; dissolving an organic ligand in a solvent; stirring and mixing the two solutions, transferring into a reaction kettle, and carrying out hydrothermal reaction; and centrifugally washing the obtained product with ethanol, and drying to obtain the rare earth ytterbium doped metal organic precursor nano material. And placing the obtained nano material in a muffle furnace for high-temperature calcination to obtain the rare earth ytterbium doped copper oxide material. The preparation method provided by the invention is simple, green, pollution-free and high in practical degree, and the obtained rare earth ytterbium-doped copper oxide nano material can be used as a catalyst for synthesizing ammonia by electrolytic nitrate reduction, and shows that the rare earth ytterbium-doped copper oxide nano material has relatively high ammonia yield and Faraday efficiency for synthesizing ammonia by nitrate reduction.

The invention discloses a difunctional electrocatalyst for carbon dioxide reduction and PET plastic oxidation and a preparation method and application of the difunctional electrocatalyst, and belongs to the field of application of electrocatalytic materials. The preparation method comprises the following steps: precipitating copper chloride and sodium hydroxide to obtain a precursor of copper hydroxide, and freeze-drying, washing and drying the precursor. The problem that the voltage required by the anode reaction is large when carbon dioxide is electrolyzed is solved. And meanwhile, the material has the advantages of excellent negative and positive electrode bifunctional activity and simultaneous generation of chemicals with high added value at the two electrodes, and has certain commercial application value. Meanwhile, the preparation method is simple, and technical feasibility is provided for large-scale preparation of fine chemicals through carbon dioxide reduction.

The invention relates to the technical field of electrode materials, in particular to a CuO-coated PVDF electrode material and a preparation method and application thereof.The preparation method comprises the following steps that a waste solar photovoltaic back plate is smashed and hydrolyzed under the alkaline condition, a polyethylene glycol terephthalate layer on the surface of the photovoltaic back plate reacts with alkali to generate ethylene glycol and terephthalic acid salt, and then a CuO-coated PVDF electrode material is obtained; pVDF in the photovoltaic backboard is separated in a precipitation form, and PVDF is prepared; the preparation method comprises the following steps: dissolving a cupric salt and a cationic surfactant in water, carrying out a co-precipitation reaction at room temperature in an alkaline environment to generate a nano Cu (OH) 2 precipitate, and drying and decomposing to obtain a CuO precursor; cuO, PVDF, acetylene black and an organic solvent are mixed and stirred, in the stirring process, the surface of CuO is coated with PVDF in situ, acetylene black is evenly distributed, and the CuO-coated PVDF electrode material with CuO nanoparticles as an inner core, PVDF as a shell and acetylene black evenly distributed is formed.

The invention relates to the technical field of hydrometallurgy, in particular to a method for selectively separating calcium sulfate in a complex reaction system. The method comprises the following steps: adding a soluble sulfate solution and a precipitant solution into a base solution in a parallel flow manner, and reacting to obtain mixed slurry containing fibrous calcium sulfate; and separating the mixed slurry containing fibrous calcium sulfate to obtain fibrous calcium sulfate crystals, metal hydroxides and purified liquid. According to the method, on the basis of wastewater treatment through a traditional precipitation method, fibrous calcium sulfate is separated from other substances in a complex system by controlling growth of calcium sulfate crystals, the environmental influence caused by solid waste is reduced while the industrial wastewater containing sulfate radicals is treated at low cost, and finally resourceful treatment of the industrial wastewater is achieved.

The invention relates to a non-noble metal-based paired electro-catalysis method for producing formic acid by coupling cathode dehalogenation with anode formaldehyde oxidation, which realizes efficient dehalogenation removal of pollutants and generation of high-value products. The Co-CuxO nanowire electrode with excellent catalytic performance is synthesized through a simple method and serves as a cathode and an anode at the same time, and the purpose that the cathode removes halogenated pollutants and the anode oxidizes formaldehyde to produce formic acid at the same time is achieved. Co-CuxO promotes generation of H *, the performance of electroreduction dehalogenation is improved, and the removal rate of trichloroacetic acid can reach 92.1% or above. And moreover, the reaction energy barrier is reduced, the selectivity of formic acid generated by oxidizing anode formaldehyde is improved, and the formic acid selectivity and Faraday efficiency can reach 100%. A paired electro-catalysis system shows extremely stable and outstanding electro-catalysis performance in the aspect of converting wastes into value-added products, and the problems of poor anode utilization rate and high energy consumption in the current electro-catalysis dehalogenation reaction are solved.

The invention relates to the technical field of synthesis of electrochemical materials, in particular to an electrocatalyst of magnesium-doped copper oxide nanospheres and a preparation method and application of the electrocatalyst, and the electrocatalyst is prepared through a one-step hydrothermal method and is of a nanosphere structure with a uniform microstructure. According to the catalyst, in a wide voltage range from-1.277 V vs.RHE to-1.677 V vs.RHE, relatively high Faraday efficiency of electrochemical reduction of carbon dioxide into C2 + chemicals is realized. In addition, the technology is green and environment-friendly, the raw materials used in the technology are cheap, the preparation process is simple, the energy consumption is low, a new thought is provided for preparation of the electrocatalyst for generating high-added-value products, and the method has a good application prospect.

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 relates to the field of materials, and discloses a three-dimensional graphene / metal oxide composite pellet and a preparation method and application field thereof, the three-dimensional graphene / metal oxide composite pellet comprises a graphene pellet and a metal oxide loaded on the graphene pellet; wherein the specific surface area of the three-dimensional graphene / metal oxide composite sphere is 50-500m < 2 > / g. In the obtained three-dimensional graphene / metal oxide composite sphere, the metal oxide is uniformly loaded on the surface of the graphene sphere, and the sphere internally has a rich pore structure, so that the application of gas sensing, catalysis, energy storage and the like is facilitated.

The application discloses a preparation method of mesoporous copper oxide and application thereof. The preparation method comprises the following steps: S1, preparing a hydroxyl copper nitrate microplate by taking calcium carbonate paper as a substrate and copper nitrate as a solvent; S2, synthesizing an ordered copper hydroxide nanowire assembly through an alkali solution reaction; and S3, performing annealing treatment in a muffle furnace to obtain the mesoporous copper oxide microplate. Under the conditions of no hard template, no soft template and no strong acid treatment, the application provides a method for synthesizing the mesoporous copper oxide microplate material with uniform pore structure on the carbonic paper by adopting copper nitrate hydrolysis, alkali etching and annealing, and the synthesis method of the mesoporous structure has the advantages of simple operation, good controllability and low cost. The application also relates to application of the mesoporous copper oxide as an electrocatalyst material in the field of glucose electrochemical sensing.

The invention provides a separation and extraction method for valuable metals in electroplating sludge, and belongs to the technical field of solid waste recycling. The electroplating sludge is copper-containing electroplating sludge, and the method comprises the following steps: mixing dehydrated and dried electroplating sludge with an organic acid solid auxiliary agent, carrying out gradient weak reduction pretreatment, cooling, and carrying out magnetic separation to remove iron; adding ammonia water to react, separating solid waste and collecting an ammonia-containing complex solution; adjusting the pH value to 9-10, carrying out distillation deamination at 60-70 DEG C, carrying out gas-solid waste separation, precipitating to obtain a copper hydroxide crude product, and dissolving the nickel element in the residual liquid; adjusting the pH value of the residual liquid to 10-11, carrying out two-stage distillation deamination, and precipitating to obtain a nickel hydroxide crude product; and purifying the copper hydroxide crude product and the nickel hydroxide crude product to obtain a copper hydroxide refined product and a nickel hydroxide refined product. According to the method, the dried electroplating sludge is mixed with the solid organic acid, reduction pretreatment is carried out under the conditions of different atmospheres and different temperatures, the ammonia complexing and graded deamination processes are combined, efficient recovery of copper and nickel is achieved, and the purity of the recovered metal is high.

The invention discloses a copper-based catalyst for preparing propyl alcohol by electrocatalytic reduction of carbon dioxide and application of the copper-based catalyst. The preparation method of the copper-based catalyst comprises the following steps: adding a sodium hydroxide solution into an aqueous solution of a copper compound to obtain a turbid solution; adding a hydroxylamine hydrochloride aqueous solution into the turbid solution, carrying out a reaction, and carrying out centrifugal drying to obtain Cu (OH) 2 / CuO; cu (OH) 2 / CuO is prepared into a working electrode, and then the working electrode is reduced into the Cu / Cu2O nanosheet through an electrochemical reconstruction method. The Cu / Cu2O electrocatalyst with the bicontinuous nano-domain structure is obtained by using a two-step electrochemical reconstruction method, and the Cu / Cu2O electrocatalyst is used as a cathode for electrocatalytic reduction of carbon dioxide. The hydrogen evolution reaction is inhibited in a KOH or KHCO3 aqueous solution system, so that the activity of propyl alcohol preparation is remarkably improved. Experiments show that the Faraday efficiency of propyl alcohol exceeds 12.1% under the current density of 0.84 A cm <-2 >, and the Faraday efficiency of propyl alcohol is good. According to the analysis, the Cu / Cu2O catalyst obtained through the electrochemical reconstruction method serves as the cathode, and the propyl alcohol can be prepared through the carbon dioxide electrocatalytic reduction reaction.

The invention discloses a copper oxide / cuprous oxide heterogeneous nano-material with chiral morphology and a preparation method thereof, and the method comprises the following steps: 1, mixing a copper salt aqueous solution and a surfactant aqueous solution to obtain a mixed solution A, taking a chiral ligand aqueous solution to add into the mixed solution A under a stirring state, and stirring at room temperature to obtain a copper oxide / cuprous oxide heterogeneous nano-material; a copper ion reaction precursor solution is obtained; and 2, adding a sodium hydroxide aqueous solution into the copper ion reaction precursor solution, stirring at room temperature to obtain a mixed solution B, transferring the mixed solution B into a hydrothermal reaction kettle, putting the hydrothermal reaction kettle into a drying oven, reacting at 120-160 DEG C for 2-6 hours, after the reaction is finished, centrifugally separating out a precipitate, and sequentially washing and drying in vacuum to obtain the copper ion catalyst. The copper oxide / cuprous oxide heterogeneous nano material with chiral morphology is obtained. The preparation method is simple, low in cost and easy to implement, and the obtained chiral copper oxide / cuprous oxide heterogeneous nano material has good structural stability and crystallinity.

The invention provides a method for preparing electronic-grade copper oxide by using circuit board acidic etching waste liquid, and belongs to the field of copper resource recovery. The method comprises the following steps: sequentially carrying out impurity removal, concentration crystallization, salt-alkali reaction and cleaning on the circuit board acidic etching waste liquid, and collecting to obtain a copper hydroxide crude product; dissolving and recrystallizing to obtain a copper hydroxide refined product; a carbonized ammonia water solution is added to react with the copper hydroxide refined product, and ammonia cupric carbonate is obtained after adsorption and purification; adding a surfactant and a zinc salt additive, and stirring; drying to obtain modified basic cupric carbonate; carrying out selective etching on the modified basic cupric carbonate by adopting dilute acid to obtain basic cupric carbonate particles; and calcining the basic cupric carbonate particles at 300-500 DEG C to obtain the copper oxide powder with the honeycomb structure. According to the method, on the basis of the basic step of recovering copper resources from the circuit board acidic etching waste liquid, the treatment steps of purification, grain refinement, porous etching and the like are added, so that the purity and the activity performance of a final copper oxide product are improved, and the electronic-grade copper oxide is prepared.

The invention relates to the technical field of negative-electrode-free lithium metal batteries, in particular to a three-dimensional copper-based composite current collector and a preparation method thereof. The preparation method comprises the following steps that pretreated foamy copper is subjected to thermal oxidation treatment, and oxidized foamy copper with a three-dimensional copper-based framework is prepared; the oxidized foamy copper is subjected to electro-deposition treatment, the oxidized foamy copper is modified through a lithium-containing compound, an SEI film containing C, O, F, N and Li is formed on the three-dimensional copper-based framework, and the three-dimensional copper-based composite current collector is prepared. Lithium-loving sites formed in the lithium electrodeposition process can induce lithium metal in-situ nucleation, the chemical stability of a lithium metal negative electrode / electrolyte interface is improved by utilizing electrolyte induction of an in-situ matching battery system and pre-regulation and control of interface components, and meanwhile, an SEI film rich in inorganic components is formed, so that growth of lithium dendrites is inhibited, the electrochemical performance is improved, and the electrochemical performance is improved. The technical problem that an existing copper negative electrode current collector is difficult to form a stable SEI film is solved.

The invention discloses a high-entropy double hydroxide / carbon fiber aerogel electromagnetic wave-absorbing material and a preparation method thereof, and the method specifically comprises the following steps: (1) activating green algae to obtain carbon fibers, and freeze-drying the carbon fibers to obtain aerogel carbon fibers; (2) immersing the aerogel carbon fiber subjected to heat treatment into a high-entropy layered double hydroxide precursor solution for hydrothermal reaction, and obtaining a high-entropy double hydroxide / carbon fiber aerogel material after the reaction; wherein the temperature of the hydrothermal reaction is 115-120 DEG C, and the reaction time is not less than 5 hours; and (3) freeze-drying the aerogel material obtained in the step (2) to obtain a target product. The high-entropy double hydroxide / carbon fiber aerogel electromagnetic wave-absorbing material disclosed by the invention can realize low-frequency absorption of 2.46 GHz under 2 to 8 GHz, and can realize broadband absorption of 12.44 GHz under 2 to 18 GHz.

The present disclosure provides a method for preparing nano copper oxide flakes, and relates to the technical field of metal powder nanomaterial preparation. The method comprises: configuring copper salt into a copper precursor aqueous solution containing a surfactant, and configuring alkali into an alkaline solution; converting the copper precursor aqueous solution containing a surfactant into a copper micro-nano aerosol containing a surfactant, and converting the alkaline solution into an alkali-containing micro-nano aerosol; performing a gas phase confined micro-region mixing pre-reaction on the copper micro-nano aerosol containing a surfactant and the alkali-containing micro-nano aerosol to obtain a copper-alkali mixed solution, and transferring the copper-alkali mixed solution to a polytetrafluoroethylene reactor for hydrothermal reaction to obtain a nanoparticle solution containing a copper compound; performing solid-liquid separation, washing, drying and roasting on the nanoparticle solution containing a copper compound to obtain a nano copper oxide flake. The present disclosure reduces the preparation cost of the nano copper oxide flake on the basis of improving the preparation efficiency of the nano copper oxide flakes.

To provide a method for simply producing cuprous oxide particles having controlled crystal planes and diameters in a high yield.SOLUTION: A method for producing cuprous oxide particles comprises reacting a hydrazine compound dissolved in a solvent with a copper carboxylate compound in which a solid phase and a liquid phase of the copper carboxyl compound coexist in the solvent, to produce the cuprous oxide particles.SELECTED DRAWING: Figure 1

To provide cuprous oxide powder with a relatively high packed bulk density and a production method for the cuprous oxide powder.SOLUTION: The cuprous oxide powder contains sulfur (S) with a content of less than 140 mass ppm and chlorine (Cl) with a content of less than 1000 mass ppm.SELECTED DRAWING: None