39results about How to "Energy-saving preparation method" patented technology

The invention provides a ceramic nanofiber and a preparing method and device thereof. The method comprises the steps of providing a precursor solution with spinnability, wherein the precursor solution includes a ceramic precursor, a polymer and a solvent; utilizing airflow to stretch the precursor solution into the nanofiber, and using a collector to collect the nanofiber; conducting sintering on the nanofiber obtained from collection to obtain the ceramic nanofiber. According to the ceramic nanofiber and the preparing method and device thereof, ultra-light, high temperature resistant and cheap ceramic nanofiber can be prepared massively, and the preparing method is fast, efficient and energy conserving, and has potential of industrialized mass production.

The invention relates to a rare earth high-strength foam aluminum prepared through a melt foaming method. The rare earth high-strength foam aluminum is made of, by mass percentage, 85%-99.3% of aluminum powder or an aluminum ingot, 0.1%-2% of a rare earth additive, 0.3%-5% of a tackifier and 0.5%-6% of a blowing agent. The blowing agent is selected from one or more of particulate metal calcium, silicon carbide, alumina and ceramic particles. The blowing agent is selected from one or more of titanium hydride powder, lanthanum hydride powder and zirconium hydride powder. According to the rare earth high-strength foam aluminum, through holes and closed holes exist at the same time, and the pore size and density distribution are uniform; and the process has the beneficial effects of being low in production cost and facilitating large-scale production.

The invention discloses a preparation method of a visible-light-induced photocatalyst with a core-shell structure. Firstly, a solvothermal method is adopted to prepare a Bi2S3 nanowire serving as a core; then, the Bi2S3 nanowire is used as a base material, a gradual assembly method is utilized to perform in-situ growth, and porous ZIF-8 serving as a shell is obtained, namely the visible-light-induced photocatalyst with the Bi2S3 nanowire serving as the core and the porous ZIF-8 as the shell is obtained. The preparation conditions are mild, the process is simple, the maneuverability is good, the obtained material has the advantages of high stability and catalytic efficiency and has the obvious visible light degradation effect on dye wastewater, the visible-light-induced photocatalyst is used for degrading Rhodamine B under visual light, the highest catalysis rate can be up to 97% in 90 minutes, and the photocatalyst is hopeful to be applied in other aspects, for example, gas absorption, photoelectric materials or photocatalytic materials.

The invention discloses a preparation method of a controllable hydrophobic bacterial cellulose-zein composite film. The method comprises the following steps: firstly, preparing and purifying a bacterial cellulose film; then soaking the bacterial cellulose film into an ethanol-water solution to perform replacement treatment; then preparing a zein solution; reacting the bacterial cellulose film and the zein solution, and performing solvent evaporation after reaction ends to obtain a bacterial cellulose-zein composite wet film; and performing drying treatment to obtain the bacterial cellulose-zein composite film. The prepared bacterial cellulose-zein composite film disclosed by the invention has adjustable high hydrophobicity, excellent mechanical performance and biocompatibility, and can play roles of controlling and enhancing the adhesion capacity of cells, accelerating the tissue repair, and the like; and moreover, the preparation method disclosed by the invention is simple and convenient to operate, can be suitable for large-scale industrial production, and has relatively good application prospects in biomedical material industry.

The invention provides a method for preparing dicarboxylic acid zinc. The method comprises the following steps: reacting a dicarboxylic acid sodium aqueous solution and a zinc chloride aqueous solution, so as to obtain dicarboxylic acid zinc. Compared with the prior art, the method takes water as a reaction solvent and avoids adopting organic solvents such as methylbenzene and acetone as the reaction solvent, and a by-product only comprises sodium chloride, so that the environmental pollution is reduced. The dicarboxylic acid zinc prepared by the method can be used for polymerization reaction of carbon dioxide and epoxide and has good catalytic activity. The method is simple, saves energy, and conforms to the concept of environmental protection. Experimental results show that the dicarboxylic acid zinc prepared by the method catalyzes the polymerization reaction of carbon dioxide and epoxy propane to generate polycarbonate, and the yield is 18.4-38.2g polymer / g catalyst.

The present invention discloses a titanium oxide micro-nanotube with a visible-light catalysis effect, and a preparation method thereof. The micro-nanotube is tubular titanium dioxide doped with sulfate in situ, the tube wall of the micro-nanotube is attached with nano-sheets formed by nanoparticles, and nano-mesopores are arranged between the nanoparticles. The preparation method comprises: mixing and stirring titanium sulfate hydrate, methanol and glycerol to obtain a mixing solution; then adding ether to the mixing solution, and stirring to obtain a precursor solution; placing the precursor solution in a sealed state, carrying out a reaction for 16-40 hours at a temperature of 105-115 DEG C, and then cooling to the room temperature to obtain a gel material; adding ethanol to the gel material, and stirring to obtain a gel mixture; carrying out treatments of ultrasound, centrifugation, washing and drying for the gel mixture to obtain an intermediate product; placing the intermediate product in the environment with the temperature of 450-550 DEG C to carry out annealing for at least 2 hours to prepare the titanium oxide micro-nanotube with the visible-light catalysis effect. The titanium oxide micro-nanotube of the present invention has significant photocatalytic properties in the ultraviolet region and the visible-light region, and can be widely used for degradation of organic pollutants.

The invention relates to a Cr2O3 / ZTA composite powder and ceramic and a preparing method thereof. The preparing method comprises the following steps that alumina powder, zirconium oxide powder and Cr(NO3)3.9H2O are mixed and subjected to ball milling, and mixed paste is obtained, wherein the mass fraction of alumina powder is 80-85% of the total mass of zirconium oxide and alumina, the balance 15-20% is zirconium oxide powder, and the adding amount of Cr(NO3)3.9H2O, converted base on Cr2O3, is 0-0.8% of the total mass of zirconium oxide and alumina; the obtained mixed paste is dried and then roasted at 400-600 DEG C, and Cr2O3 / ZTA powder is obtained. The Cr2O3 additive is introduced in the mode of precursor Cr(NO3)3.9H2O, and thus Cr2O3 can be more evenly dispersed into ZTA powder.

The invention relates to a preparation method of a carbon nano tube-modified layered lithium-enriched high-manganese positive electrode material. The preparation method comprises the following steps of mixing lithium salt, manganese salt and M salt to form a mixture, carrying out vacuum drying on the mixture, sintering, grinding so as to form a body phase-doped powder body, carrying out thermal treatment on the body phase-doped powder body so as to form a precursor, compressing the precursor to form a green body, and putting the green body into a pyrophyllite cavity so as to prepare a layered lithium-enriched high-manganese positive electrode material; and adding the layered lithium-enriched high-manganese positive electrode material, a polyvinylidene fluoride bonding agent and a conductive agent according to a proportion into an N-methyl pyrrolidone solution, stirring and drying so as to obtain the carbon nano tube-modified layered lithium-enriched high-manganese positive electrode material. The preparation method provided by the invention has the characteristics of high efficiency, rapidness and energy conservation; the lithium-enriched positive electrode material synthesized by adopting the synthesis method has the advantages of high capacity, high-temperature stability, good cycle performance, high compaction density, high charging speed and the like.

The invention discloses a hafnate luminescent material which has the general formula of Y2-xHf7O17:Eux, wherein, X is 0.01-0.3; the invention also discloses a method for preparing the hafnate luminescent material, which comprises the steps: solid yttrium nitrate and hafnyl chloride are put into a container by taking the mol ratio of 3:25-3:10 as the mixture ratio and dissolved by distilled water; Eu(NO3)3 solution is added into the mixture, and the molar weight of Eu is 1%-30% of the molar weight of Y; the pH value of the solution is regulated to be 1 by using nitric acid; the blended fuel of glycin and urea is added into the solution, and ethylenediamine tetracetic acid (EDTA) having the mass accounting for millesimal of the total mass of the raw material is taken as chelating agent and added into the solution; the mixture is burnt in a furnace at the temperature of 450 DEG C to obtain precursor, and then sintered for 2 hours at 800 DEG C in a high temperature furnace, thereby obtaining the Y2-xHf7O17:Eux material. The material obtained by the invention can be used in an X-ray intensifying screen of high-energy physics, medical use or safety inspection. The preparing method has the advantages of safety, time-saving, energy-efficiency, etc.

The invention discloses a long-acting cyclic sodium carbon fluoride secondary battery and a preparation method, the long-acting cyclic sodium carbon fluoride secondary battery comprises a positive electrode, a negative electrode and an electrolyte, the electrolyte is a sodium ion solid electrolyte, and the sodium ion solid electrolyte is prepared from polyvinylidene fluoride, a sodium ion conductor and a sodium salt; the active material of the positive electrode is carbon fluoride, and the negative electrode is metal sodium. The sodium ion solid electrolyte membrane prepared by the invention belongs to a flexible membrane, selects the polyvinylidene fluoride as a matrix, has good chemical compatibility with a metal sodium negative electrode, and can be used without adding an isolation layer. The sodium-ion solid electrolyte is used for replacing a liquid electrolyte, so that the safety of a sodium-carbon fluoride secondary battery can be effectively improved, and meanwhile, the cyclingstability is improved. The preparation method is simple and energy-saving.

The invention relates to a method for preparing ultrafine-yttria stable zirconia powder. The method comprises the steps: (1) adding an alkaline reagent into a solution containing Zr<4+> and Y<3+>, carrying out thorough stirring, and carrying out heating for 36 to 48 hours at the temperature of 100 DEG C to 120 DEG C so as to form white precipitates in the solution; (2) carrying out heat preservation on the white precipitates prepared in the step (1) for 24 to 48 hours at the temperature of 150 DEG C to 180 DEG C; and (3) cleaning the white precipitates subjected to heat preservation treatment in the step (2), and then, carrying out calcination at the temperature of 900 DEG C to 1,200 DEG C, thereby obtaining the yttria stable zirconia powder.

The invention provides a nano-fluorescent probe as well as a preparation method and application thereof. The nano-fluorescent probe is a composite nanomaterial, a surface sulfydryl modified SiO2 nanofiber is taken as a matrix fiber, gold nanoparticles and Hg<2+> ions are modified on the surface of the matrix fiber, the gold nanoparticles are connected to the matrix fiber through sulfydryl, and Hg<2+> ions are attached to the nanomaterial through metal bonds formed by the Hg<2+> ions and Au<+>; and the particle size of the gold nanoparticles is less than 3 nm, the radial size of the nano-fluorescent probe is in nanoscale, and the axial size of the nano-fluorescent probe is in micron-scale. The probe can be used for qualitative and quantitative detection of glutathione and is simple to operate, high in sensitivity, recyclable and higher in economic value, and the preparation method has the advantages of being simple, energy-saving and environment-friendly.

The invention belongs to the technical field of logistics trays, and provides a rare earth ferrosilicon alloy ash-based composite material which is prepared from 30 to 40 parts of rare earth ferrosilicon alloy ash, 47 to 57 parts of polyvinyl chloride, 2 to 3 parts of stabilizer, 2 to 4 parts of modifier, 1.5 to 2.5 parts of foaming agent, 4 to 8 parts of foaming regulator, and 0.2 to 0.6 part oflubricating agent. The invention further provides a logistics tray obtained through the rare earth ferrosilicon alloy ash-based composite material. The tray has the characteristics of reasonable structure design, simple structure, light weight, high bearing capacity, good waterproofness and corrosion resistance, reusability and the like. It is shown, by the embodiment result, that the density of the logistics tray provided by the invention is 0.61 to 0.7 g / cm<3>, and the static bending intensity is 32 to 40 MPa. The invention further provides a preparation method of the logistics tray. The preparation method is energy-saving, clean, simple and convenient.

The invention relates to a trollius chinensis extract, a preparation method thereof and a preparation containing the same. The trollius chinensis extract contains total flavone, cytisine and veratric acid, and the preparation method of the trollius chinensis extract includes the steps that trollius chinensis liquid obtained through water decoction or alcohol water is subjected to deep filtration, and a flocculating and clarifying agent is adopted for clarification; the flocculating and clarifying agent is a type-II ZTCl + natural clarifying agent or is prepared from a component B in the type-II ZTCl + natural clarifying agent and chitosan. A deep filtration combined flocculation precipitation technology is adopted to remove impurities, macromolecular substances such as tannin are effectively removed, the flavone, the cytosine, the veratric acid and other active ingredients are also effectively retained, the active ingredient content of the extract is improved, and the antibacterial activity and in-vitro antiviral activity of the extract are strong. The preparation method is simple, capable of saving energy, environmentally friendly and low in organic residue content.

The invention provides a composite soft magnetic material thin film based on Fe-Si-Al soft magnetic materials and a manufacturing method of the composite soft magnetic material thin film. The thin film comprises Fe-Si-Al soft magnetic powder particles, a silicon dioxide hardened network structure formed by dehydrating water glass and manganese zinc ferrite soft magnetic powder particles, the Fe-Si-Al soft magnetic powder particles are coated with the manganese zinc ferrite soft magnetic powder particles, the particles are bonded through the silicon dioxide hardened network structure formed by dehydrating the water glass, and mechanical strength is formed. The manufacturing method of the thin film comprises the steps of pretreatment on Fe-Si-Al soft magnetic powder of thin film base materials, insulation coating on the thin film base materials with manganese zinc ferrite soft magnetic powder and low-temperature solidification forming with adhesives of the water glass. Manganese zinc ferrite is used as insulating agents, the high-frequency magnetic performance of the composite soft magnetic material thin film can be regulated, and the upper limit of working frequency is improved; good bonding power is achieved. The thin film saves energy, and is environmentally friendly and good in process compatibility, and the composite soft magnetic material thin film with excellent comprehensive magnetic performance can be obtained.

The invention discloses a preparation method and application of a titanium dioxide nanorod array / silver nano composite material, and belongs to the field of nano materials. The preparation method comprises the following steps of: dissolving tetrabutyl titanate in a hydrochloric acid solution to obtain a hydrochloric acid solution of tetrabutyl titanate; putting a substrate into a hydrochloric acidsolution of tetrabutyl titanate, and performing hydrothermal reaction at a temperature of 140-160 DEG C for 3-10 hours to obtain a titanium dioxide nanorod array, the substrate being fluorine-doped stannic oxide transparent conductive glass; putting the titanium dioxide nanorod array into a silver-ammonia solution, and performing standing for 4-6 hours at a room temperature to obtain a mixture; and adding an ethanol solution of polyvinylpyrrolidone into the mixture, and reacting at a temperature of 60-80 DEG C for 2-4 hours to obtain the titanium dioxide nanorod array / silver nano composite material. According to the preparation method, a hydrothermal method and a chemical oxidation method are combined, so that the operation is simpler, the reaction temperature is low, and the preparationmethod is more energy-saving. The titanium dioxide nanorod array / silver nano composite material obtained by adopting the preparation method has the good SERS activity.

The invention relates to the field of environmental protection and purification, in particular to a preparation method, a product and application of nano magnesium oxide. The invention provides a preparation method of the nano magnesium oxide. The method comprises the following steps: preparing magnesium hydroxide sol by using magnesium methoxide as a raw material; heating the magnesium hydroxide sol to 130-155 DEG C at a constant heating rate, and preserving heat to obtain magnesium hydroxide gel; and sintering the magnesium hydroxide gel to obtain the nano magnesium oxide. The preparation method of the nano magnesium oxide provided by the invention is efficient, rapid and energy-saving; the nano magnesium oxide with small particle size, large specific surface area and uniform particle size distribution can be prepared; and the nano magnesium oxide disclosed by the invention has excellent effects of degrading oxygen and phosphorus and adsorbing heavy metal ions such as Pb (II).

The invention discloses a method for preparing a vanadium dioxide film with thermal-reflectivity response. The method comprises the steps of pretreating glass fibers, dipping a precursor solution and sintering dipped glass fiber cloth. According to the method, the prepared vanadium dioxide film has good thermal-optical response performance and has sudden change of reflectivity at the temperature about 38 DEG C. The reflectivity is at a high level when the temperature is below 38 DEG C, the reflectivity is at a low level when the temperature is above 38 DEG C, and this property is reversible. The vanadium dioxide film can be applied to negative feedback adjustment on temperature in a greenhouse by using the thermal-reflectivity response of the vanadium dioxide film, so that the indoor temperature can be maintained to about 38 DEG C, and the development of plants in the greenhouse is facilitated. The method, which takes the glass fiber cloth as a carrier, for preparing the vanadium dioxide film with the thermal-reflectivity response, disclosed by the invention, has the advantages of energy saving, cheapness, safety, simplicity, stability, short consumed time and the like.

The invention belongs to the technical field of fertilizers, and discloses a chelated iron compound fertilizer, a preparation method thereof and a slow-release soil conditioner, wherein siderite, citric acid and water are subjected to chelation reaction and solid-liquid separation to obtain a liquid phase which is the chelated iron compound fertilizer and a solid phase which is the slow-release soil conditioner. According to the invention, a large amount of siderite existing in nature is used as a main raw material, and the liquid chelated iron compound fertilizer with ferrous citrate as a main component is prepared through a simple chelation reaction, is suitable for being sprayed on plant leaf surfaces, and can effectively relieve / prevent / correct the iron-deficiency yellow leaf phenomenon of plants and achieve the purpose of iron supplementation; the chelated iron compound fertilizer also contains trace elements such as titanium citrate, magnesium citrate and manganese citrate which are beneficial to plant growth, so that the problem of single nutrition of the existing iron fertilizer is solved; the slow-release soil conditioner is suitable for being scattered into continuous cropping land, and soil hardening and nutrient-deficient physiological diseases caused by continuous cropping are prevented.

The invention discloses a near-neutral high-content boron fertilizer and a preparation method thereof. The boron fertilizer is prepared from the following raw materials in a mass ratio: 60 to 75 of boric acid and 25 to 40 of borax. The method for preparing the high-content boron fertilizer comprises the following steps: (1) fully mixing the boric acid and the borax; (2) heating and dehydrating the mixture at the temperature of between 400 and 450 DEG C to obtain a mixture of boric anhydride and anhydrous borax; (3) cooling the mixture of the boric anhydride and anhydrous borax under drying condition; and (4) after cooling the mixture of the boric anhydride and anhydrous borax to below 60 DEG C, crushing and sieving the mixture to obtain the near-neutral high-content boron fertilizer. The near-neutral high-content boron fertilizer has the characteristics of high content of pure boron, low consumption and high solubility. The method for preparing the high-content boron fertilizer has the advantages of simple and convenient operation and energy conservation.

The invention discloses a method for preparing the polyol ester resin of terpene and rosin diene addition product based on rosin. The method disclosed by the invention comprises the following preparation steps of: (1) mixing turpentine with rosin, removing impurities by means of heating and stirring to dissolve, filtering, washing and the like, clarifying to separate water, then performing atmospheric distillation, distilling out water and a part of turpentine left in rosin by virtue of an oil-water azeotropic principle, so as to obtain a pure rosin liquid, analysing the contents of turpentine and rosin in the rosin liquid, and preparing to achieve a certain ratio; (2) metering the pure rosin liquid, preparing the pure rosin liquid with turpentine to obtain a reaction raw material A, and reacting the reaction raw material A with a dienophile addition agent under the action of catalysis, so as to generate a turpentine-rosin diene addition product; (3) performing esterification on polyols and the turpentine-rosin diene addition product; (4) performing vacuum reduced pressure distillation to remove water generated during the esterification, unreacted alcohols, and the low-molecular substances generated by side reactions, so as to obtain the polyol ester resin of terpene-rosin diene addition product. The method disclosed by the invention is simple in process flow and achieves energy-saving and environment-friendly effects.

The invention relates to a method for preparing functionalized crosslinked monodisperse polymer microspheres through one-step dispersion polymerization. The method takes polyfunctional thiol, isocyanate and functional monomers as disperse phases and takes an alcohol-water solution of polyvinyl pyrrolidone as a continuous phase and carries out one-step dispersion polymerization at room temperature under the condition of no additional catalyst / initiator so as to obtain the functionalized crosslinked monodisperse microspheres. Different from the traditional free radical chain polymerization mechanism, the thiol-isocyanate reaction follows the anionic step polymerization mechanism, the reaction can be efficiently carried out in the presence of few nucleophilic reagents, and no side reaction is generated in the presence of water, alcohol and amine. A very high monomer conversion rate can be obtained within a very short period of time in polymerization. The method is very suitable for preparing polymer microspheres in heterogeneous system polymerization. Therefore, compared with the traditional dispersion polymerization, the method provided by the invention has the advantages of being efficient and energy-saving in preparation process, simple in technological operation and easy to realize large-scale preparation and popularization.

The invention discloses a near-neutral high-content boron fertilizer and a preparation method thereof. The boron fertilizer is prepared from the following raw materials in a mass ratio: 60 to 75 of boric acid and 25 to 40 of borax. The method for preparing the high-content boron fertilizer comprises the following steps: (1) fully mixing the boric acid and the borax; (2) heating and dehydrating the mixture at the temperature of between 400 and 450 DEG C to obtain a mixture of boric anhydride and anhydrous borax; (3) cooling the mixture of the boric anhydride and anhydrous borax under drying condition; and (4) after cooling the mixture of the boric anhydride and anhydrous borax to below 60 DEG C, crushing and sieving the mixture to obtain the near-neutral high-content boron fertilizer. The near-neutral high-content boron fertilizer has the characteristics of high content of pure boron, low consumption and high solubility. The method for preparing the high-content boron fertilizer has the advantages of simple and convenient operation and energy conservation.

The invention provides a nano-fluorescent probe as well as a preparation method and application thereof. The nano-fluorescent probe is a composite nanomaterial, a surface sulfydryl modified SiO2 nanofiber is taken as a matrix fiber, gold nanoparticles and Hg<2+> ions are modified on the surface of the matrix fiber, the gold nanoparticles are connected to the matrix fiber through sulfydryl, and Hg<2+> ions are attached to the nanomaterial through metal bonds formed by the Hg<2+> ions and Au<+>; and the particle size of the gold nanoparticles is less than 3 nm, the radial size of the nano-fluorescent probe is in nanoscale, and the axial size of the nano-fluorescent probe is in micron-scale. The probe can be used for qualitative and quantitative detection of glutathione and is simple to operate, high in sensitivity, recyclable and higher in economic value, and the preparation method has the advantages of being simple, energy-saving and environment-friendly.

The invention discloses a preparation method of a transparent ceramic glitter material. A general formula of the material is HfO2-Gd2O3:Eu<3+> and the material is prepared through the following steps:dissolving Gd2O3 in HNO3 to prepare Gd(NO3)3 solution of 1-2mol / L, and dissolving Eu2O3 in HNO3 to prepare Eu(NO3)3 solution of 0.08-0.1mol / L; placing HfOCI2 powder in a beaker and using distilled water for dissolution, adding the Gd(NO3)3 solution, stirring evenly, then adding the Eu(NO3)3 solution, and using nitric acid for adjusting the pH value of the solution to be 1-2; adding mixed fuel ofglycine and urea in the solution while stirring, heating for 20-30 minutes at temperature of 200 DEG C for removing water after stirring with strong force, burning for 40-70 minutes in a retortfurnaceof 450 DEG C, and stirring for 2 hours in a high temperature furnace at the temperature of 800 DEG C, then obtaining the material. The prepared material can be used for intensifying screens of X raysfor medical use or security inspection in high energy physics, and the preparation method has the characteristics of being safe, saving time and energy, and the like.

The invention provides a metal substrate / cobalt-containing hydrotalcite nano-film electrode and a preparation method thereof. The electrode is obtained by growing a cobalt-containing hydrotalcite nano-film on a metal substrate, and can be directly used as an electrode. The preparation method is as follows: adding H2O2 into mixed salt liquor containing transition metal and cobalt to prepare electrolyte; adding an electrolyte into an electrolytic tank; on the basis of taking the metal substrate as a working electrode, carrying out electro-deposition at a room temperature, combining metal ions in liquor with hydroxyl radical, directly growing on the surface of the metal substrate, partly oxidizing divalent cobalt ion into trivalent cobalt ion by H2O2 to obtain a cobalt-containing hydrotalcite nano-film. Compared with the conventional powder synthetic method, the preparation method disclosed by the invention is simple to operate and gentle in reaction condition, and has non-toxic reaction agent; the nano-film is directly grown on the metal substrate without using a binder or carrying out post-treatment. The substrate can be a flexible metal substrate in various dimensions, and is suitable for large-scale production and engineering application of the cobalt-containing hydrotalcite nano-film. The cobalt-containing hydrotalcite nano-film electrode can be directly used for electrochemical water oxidation catalytic reaction, and has high catalytic activity on water oxidization reaction and good stability.

The invention provides a ceramic nanofiber and a preparing method and device thereof. The method comprises the steps of providing a precursor solution with spinnability, wherein the precursor solution includes a ceramic precursor, a polymer and a solvent; utilizing airflow to stretch the precursor solution into the nanofiber, and using a collector to collect the nanofiber; conducting sintering on the nanofiber obtained from collection to obtain the ceramic nanofiber. According to the ceramic nanofiber and the preparing method and device thereof, ultra-light, high temperature resistant and cheap ceramic nanofiber can be prepared massively, and the preparing method is fast, efficient and energy conserving, and has potential of industrialized mass production.

The invention discloses a preparation method of nano Cu2O with a flower-like structure and application thereof and belongs to the fields of nano material preparation technologies and catalytic property application. The preparation method comprises the following specific steps: under a room-temperature condition, adopting copper acetate as a main raw material, adding proper amounts of catalyst, reducing agents and protective agents, magnetically stirring and reacting for 45-180 minutes under a room temperature, centrifugally separating suspension liquid, using deionized water to wash for 3-5 times, carrying out air drying at a room temperature to obtain an ideal nano Cu2O with the flower-like structure. The nano Cu2O with the flower-like structure can be used as a catalyst to be applied toreaction of preparing 1H-1,2,3-benzotriazole and derivatives by 1,3-dipolar cycloaddition reaction, has the characteristics of high selectivity and good cycling performance, and shows good catalytic performance. The whole preparation method disclosed by the invention is carried out in a pure water solution system under a room temperature, the experimental operation process is simple, the yield ofa target product is high, the preparation process is stable, the requirements on instruments and equipment are low and the energy-saving and environment-friendly effects are achieved.

The invention discloses a method for preparing a vanadium dioxide film with thermal-reflectivity response. The method comprises the steps of pretreating glass fibers, dipping a precursor solution and sintering dipped glass fiber cloth. According to the method, the prepared vanadium dioxide film has good thermal-optical response performance and has sudden change of reflectivity at the temperature about 38 DEG C. The reflectivity is at a high level when the temperature is below 38 DEG C, the reflectivity is at a low level when the temperature is above 38 DEG C, and this property is reversible. The vanadium dioxide film can be applied to negative feedback adjustment on temperature in a greenhouse by using the thermal-reflectivity response of the vanadium dioxide film, so that the indoor temperature can be maintained to about 38 DEG C, and the development of plants in the greenhouse is facilitated. The method, which takes the glass fiber cloth as a carrier, for preparing the vanadium dioxide film with the thermal-reflectivity response, disclosed by the invention, has the advantages of energy saving, cheapness, safety, simplicity, stability, short consumed time and the like.