978results about "Aerogel preparation" patented technology

The invention relates to a flame-retardant and heat-insulating aerogel composite material as well as a preparation method and application thereof, and belongs to the technical field of novel building materials. The fiber aerogel is prepared through coaxial electrostatic spinning, an injector containing a polymer spinning solution is connected to a skin layer needle tube connecting port, an injector containing air is connected to a core layer needle tube connecting port, coaxial electrostatic spinning is carried out to prepare micron fibers with skin-core structures, the micron fibers fall on a receiving base material, and the micron fibers with the skin-core structures fall on the receiving base material. A hollow fiber aerogel material with a three-dimensional fluffy structure is obtained, in-situ growth of hydrated nano silicate particles is carried out after thermal crosslinking treatment, the nano silicate particles grow along the fiber surface and cover the micron fiber surface of the hollow fiber aerogel material, and the aerogel composite material is obtained. The hydrated nano silicate particle growth solution comprises polyvinyl alcohol, calcium salt, silicate and aluminum salt. The prepared aerogel composite material has excellent flame retardance and heat insulation performance and is suitable for being used as a building material.

The invention provides a super-hydrophobic / super-oleophylic degradable photo-thermal aerogel adsorption material and demulsification performance thereof, and belongs to the technical field of oil-water separation materials, and the super-hydrophobic / super-oleophylic degradable photo-thermal aerogel adsorption material is prepared by the following steps: (1) extracting cellulose from waste cartons and performing ultrasonic dispersion to prepare a cellulose suspension; (2) preparing a chitosan solution; (3) mixing the cellulose suspension and the chitosan solution to obtain a cellulose / chitosan composite solution, adding nano carbon black particles, glutaraldehyde and a methyltrimethoxysilane aqueous solution into the cellulose / chitosan composite solution, and stirring; (4) injecting the mixed solution into a mold, and performing directional freezing on a semiconductor refrigeration platform; and (5) performing freeze drying on the frozen sample, and then putting the frozen sample into a drying oven for cross-linking to obtain the aerogel. The aerogel is obtained by taking cellulose extracted from waste cartons and chitosan as organic frameworks, carrying out chemical crosslinking through glutaraldehyde, introducing nano carbon black particles as photo-thermal components and carrying out hydrophobic modification through methyltrimethoxysilane, and has an excellent pore structure, super-hydrophobicity-super-lipophilicity and excellent mechanical properties; the adsorbent has efficient adsorption capacity on high-viscosity crude oil; and the device can be repeatedly used and is biodegradable, so that the burden on the environment is reduced.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for preparing fiber-reinforced coal gangue-based composite functional aerogel. After being activated, the coal gangue is put into an acid leaching solution to be leached, and an aluminum-rich solution is obtained; adding ammonia water into the aluminum-rich solution to adjust the pH to obtain hydroxide precipitate; adding a sodium hydroxide solution into the precipitate to react to obtain a sodium aluminate solution; neutralizing the sodium aluminate solution with hydrochloric acid to obtain an aluminum chloride solution, stirring to obtain aluminum sol, and adding ceramic fibers into the aluminum sol; violently stirring the sol, and adding epoxypropane to obtain wet gel; after aging the wet gel, carrying out surface modification to obtain hydrophobic coal gangue-based aluminum oxide and composite wet gel of the hydrophobic coal gangue-based aluminum oxide; and drying the modified wet gel at normal pressure to obtain the hydrophobic coal gangue-based aluminum oxide and the composite aerogel thereof. Ceramic fibers are introduced as a reinforcing phase, so that the compressive strength and toughness of the material are improved; the composite aerogel is subjected to surface modification, uniform modification is ensured, the contact angle is remarkably increased, the hygroscopicity is reduced, and the stability of the material is enhanced.

The present disclosure relates to non-flexible composite insulation materials comprising a metal oxide matrix reinforced with a fibrous material embedded therein. Specifically, the present disclosure relates to use of the non-flexible composite insulation materials for thermal batteries and the like. The non-flexible composite insulation materials with low thermal conductivity provided herein is capable of meeting the mechanical requirements for thermal battery design yet provides improved handleability compared to the commercially available insulators.

The invention relates to the technical field of self-thermal-insulation mortar, in particular to self-thermal-insulation mortar and a preparation method thereof. Comprising the following components: Portland cement, a gradient graphene aerogel skeleton, metal organic framework nanoparticles, photo-thermal-phase change coupling microcapsules, magnetic field orientation Fe3O4 nanosheets, self-repairing microcapsules, silicon carbide nanowire aerogel, a water reducing agent and a fiber reinforced material. The gradient graphene aerogel skeleton, the photo-thermal-phase change coupling microcapsules and other materials with excellent thermal insulation performance are introduced, and a multi-layer thermal insulation structure is constructed. The gradient graphene aerogel skeleton has extremely low heat conductivity coefficient and high porosity, and can effectively prevent heat transfer; the photo-thermal-phase change coupling microcapsules can absorb and release a large amount of heat in the phase change process, and the heat preservation effect of the mortar is further improved.

The invention provides a super-hydrophobic passion fruit peel carbon aerogel VOCs adsorbent based on low-temperature plasma synergistic nitrogen doping modification and a preparation method thereof, and relates to the technical field of VOCs adsorbents. The super-hydrophobic passion fruit peel carbon aerogel VOCs adsorbent based on low-temperature plasma synergistic nitrogen doping modification is prepared by crushing passion fruit peel, mixing the crushed passion fruit peel with a nitrogen-containing compound to form gel, performing low-temperature plasma modification, performing freeze drying, performing high-temperature carbonization, and performing water washing and drying. The adsorbent is spherical, and the water contact angle is 115.8 degrees to 152.4 degrees. The adsorbent disclosed by the invention has the advantages of super hydrophobicity, high specific surface area, developed microporous structure, excellent VOCs adsorption performance, broad-spectrum adsorption capacity, good reusability and mechanical strength, the preparation method is simple in process, green and environment-friendly, low in cost and good in universality, a new technical scheme is provided for VOCs treatment in a high-humidity environment, and the adsorbent has a good application prospect.

The invention discloses a thermally-induced flexible composite phase change material coupled multi-crosslinking network aerogel material and thermal protection application, and belongs to the technical field of new materials. The coupling material is composed of multiple cross-linked network aerogel, a thermally-induced flexible composite phase change material and a binder. Wherein the thermally-induced flexible composite material is a hydrated inorganic salt phase-change material, the binder is a flame-retardant inorganic binder, and the multi-crosslinked network aerogel is a sodium alginate / gelatin composite material and is crosslinked through a double-crosslinking agent to form a stable multi-network structure for improving the flame retardance and mechanical strength of the aerogel. The prepared coupling material has high flame retardance and good heat insulation performance, and is very suitable for large-scale application in the field of thermal protection in buildings, batteries and electronic devices in the future.

The invention belongs to the technical field of radioactive wastewater treatment, and particularly relates to composite aerogel for adsorbing Cs < + > and Sr < 2 + > in radioactive wastewater under an acidic condition and a preparation method of the composite aerogel. The preparation method of the composite aerogel comprises the following steps: (1) synthesizing ammonium phosphomolybdate / sodium alginate aerogel; (2) growing ZIF-8 on the surface of the ammonium phosphomolybdate / sodium alginate aerogel; and (3) modifying the surface of the material obtained in the step (2) by using potassium permanganate to generate MnO2, thereby obtaining the composite aerogel. The composite aerogel can efficiently adsorb Cs < + > and Sr < 2 + > in wastewater to realize efficient co-adsorption of double ions, and has the advantages of low energy consumption, high selective separation efficiency, capability of carrying out one-step curing separation, no secondary pollution and capability of effectively avoiding the defects of redundant separation operation and large waste liquid amount in a traditional method, and a high-capacity and easily-recycled adsorbent scheme is provided for radioactive wastewater treatment.

The invention relates to aramid nanofiber-based carbonaceous aerogel and a preparation method thereof. The preparation method comprises the following steps: dispersing aramid fibers in an alkali solution, and washing with deionized water to obtain an aramid fiber dispersion liquid; performing vacuum filtration on the aramid fiber dispersion liquid, and performing freeze drying to obtain aramid fiber nanofiber aerogel; the aramid fiber nanofiber aerogel is subjected to carbonization treatment, and the aramid fiber nanofiber based carbonaceous aerogel is prepared. According to the preparation method disclosed by the invention, the highest evaporation rate of the obtained aramid nanofiber-based carbonaceous aerogel can reach 3.42 Kg / m < 2 > h by regulating and controlling the hydrolysis degree of the aramid fibers and combining vacuum suction filtration, and the aramid nanofiber-based carbonaceous aerogel has a good evaporation effect; in actual use, hydrophobic treatment is carried out on the upper surface of aerogel, and the defect that the photo-thermal evaporation effect of a product is reduced due to the fact that an open water layer is generated at a gas-liquid interface in the use process is effectively overcome.

The invention relates to an active and passive integrated fireproof insulation board and a preparation method thereof. The active and passive integrated fireproof insulation board comprises n passive fireproof layers and n or n + 1 active fireproof layers, the passive fireproof layer and the active fireproof layer are laminated into a whole; the passive fireproof layer comprises inorganic fiber felt and aerogel; the aerogel is obtained by curing an adhesive aerogel stock solution, and the stock solution comprises the following components in parts by mass: 1000-4000 parts of silica sol, 50-150 parts of silicate, 10-50 parts of a phosphate adhesive, 5-20 parts of quick lime, 5-50 parts of titanium dioxide, 10-50 parts of calcium stearate, 5-50 parts of a hydrophobic modifier, 5-50 parts of an acid-base regulator and 1000-4000 parts of a solvent; the active fireproof layer is at least one of inorganic fireproof plates such as a gypsum fireproof plate and the like which can actively consume energy after being heated and decomposed. The problems that an existing fireproof insulation board is high in organic matter content, poor in flame retardance and high in hygroscopicity, and the thermal insulation performance and safety are obviously reduced after the fireproof insulation board is used are solved.

The present disclosure provides an aerogel composite encapsulation structure and a method for making the aerogel composite encapsulation structure. The method for making the aerogel composite encapsulation structure includes providing an aerogel composite with a hydrophobic modifier, and disposing an encapsulation film on a surface of the aerogel composite, so that the aerogel composite is encapsulated by the encapsulation film. The hydrophobic modifier is grafted on at least surface of the aerogel composite, and a thickness of the aerogel composite ranges from 0.09mm to 5mm. A thickness of the encapsulation film ranges from 0.01mm to 0.3mm, and a material of the encapsulation film includes a plastic encapsulation material.

The invention provides a preparation method of a quick-freeze-drying low-cost calcium silicate aerogel, which takes cheap inorganic calcium salt and inorganic silicon source as raw materials, and provides a preparation method of the calcium silicate aerogel, which comprises the following steps: forming calcium-silicon hydrolysate, introducing a coagulant, gelling and freezing, freeze-drying, carrying out heat treatment and the like, thereby obtaining the quick-freeze-drying low-cost calcium silicate aerogel. The calcium silicate aerogel material with three-dimensional nanopores, low density, temperature resistance, fire prevention and excellent thermal stability is prepared. The temperature-resistant and fireproof calcium silicate aerogel is prepared by taking low-cost inorganic calcium and an inorganic silicon source as raw material parts through quick freeze drying, and has important significance on industrial cost reduction and efficiency improvement.

The invention discloses a preparation method of a salt-resistant double-layer photo-thermal aerogel evaporator. The preparation method comprises the following steps: S1, cutting and cleaning foamed nickel, and then carrying out vacuum drying; s2, preparing Cu2O / NF (nickel nitrate); s3, preparing ppy-Cu2O / NF (nickel fluoride); s4, preparing hydrogel; and S5, flatly placing a sample ppy-Cu2O / NF on the top surface of the hydrogel, continuing to stand for gelling, enabling the photo-thermal layer and the bottom layer hydrogel to be fully combined, pre-freezing, transferring into a freeze dryer, and freeze-drying to finally obtain the salt-tolerant double-layer photo-thermal aerogel evaporator, namely the lightweight porous aerogel material ppy-Cu2O / NF / FCP with the double-layer structure. The device has the advantages that the high-level evaporation rate and efficient energy conversion are achieved, and efficient photo-thermal conversion and heat management are achieved through the double-layer structure design.

The invention provides a microbial slow-release porous composite material for sewage treatment as well as a preparation method and application thereof. The preparation method comprises the following steps: dropwise adding an organic ligand solution into a precursor solution consisting of a nanocellulose solution and a cobalt source solution; mixing the reaction solution with polyvinyl alcohol, injecting the mixture into a mold, and performing directional freezing to obtain an aerogel matrix; carrying out hydrophobic modification on the aerogel matrix to obtain a modified aerogel matrix; mixing the microbial suspension with sodium alginate, and homogenizing at high pressure to obtain a gel precursor emulsion; the preparation method comprises the following steps: dropwise adding a calcium chloride solution to gelatinize to obtain gel particles, and then cross-linking and drying by glutaraldehyde to obtain sustained-release capsule particles; dispersing the sustained-release capsule particles in deionized water to obtain dispersion liquid; and dipping the modified aerogel matrix in the dispersion liquid. An aerogel matrix with a hierarchical porous structure is compounded with a sustained-release capsule with a pH response mechanism, so that physical adsorption, chemical catalysis and biodegradation for sewage treatment are realized.

The invention discloses a method for improving photo-thermal conversion efficiency of a photo-thermal material under large-range light intensity, the photo-thermal material and a solar heat collector, and belongs to the field of solar evaporation water treatment. According to the technical scheme, the method comprises the steps that polyaniline particle-loaded carbon aerogel is prepared, the light intensity range is greatly widened to 10 sunlight intensities or above through a Fresnel lens, the corresponding relation between the material surface water evaporation rate and the temperature change is established, and the energy loss is reduced to the maximum extent by adding a foam side heat insulation layer; and the water evaporation rate of the photo-thermal material is improved. The method is applied to the aspect of solar water evaporation, and the problem that the water evaporation rate is low in an existing solar evaporation method is solved.

The invention discloses a Janus super-wettability gradient pore structure cellulose aerogel material for efficient seawater desalination and oil-water separation as well as a preparation method and application of the Janus super-wettability gradient pore structure cellulose aerogel material. According to the aerogel material, a self-assembled gradient pore structure is matched with a high-strength bio-based skeleton formed by chemical crosslinking, an enhanced chemical crosslinking-physical strengthening network structure is formed, and finally solution replacement and normal-pressure drying are performed in absolute ethyl alcohol to obtain the aerogel material. Under the support of a chemical crosslinking effect and a gradient pore physical structure formed by self-assembly of the material, the integrity and mechanical strength of the pore wall of the obtained material are ensured, and meanwhile, in the aerogel preparation and modification process of PVA, PEI and MTMS, the material has excellent upper and lower double-layer super-hydrophobic and super-hydrophilic asymmetric wettability; therefore, the composite material has efficient oil-water emulsion separation performance, lasting super-hydrophilic / underwater super-oleophobic stability, excellent mechanical performance and seawater desalination treatment performance in a high-salinity environment.

The application discloses a MnFe2O4 / GO wave-absorbing aerogel with a directional aperture structure and a preparation method thereof, belongs to the technical field of wave-absorbing material preparation, and is characterized in that manganese ferrite (MnFe2O4) magnetic particles are uniformly loaded on the surface of graphene to obtain a graphene aerogel with a three-dimensional loose porous structure and magnetic particle assembly; the MnFe2O4 is prepared by using a low-temperature co-precipitation method, and the MnFe2O4 / GO wave-absorbing aerogel is prepared by combining directional freezing and heat treatment, and the method is mild and simple. The application improves the impedance mismatch problem of the graphene material, enhances the magnetic loss of the material, and obtains a novel porous aerogel wave-absorbing material which has both dielectric loss and magnetic loss by introducing the manganese ferrite.

A polyethylene terephthalate aerogel. There is provided a polyethylene terephthalate (PET) aerogel comprising a porous network of cross-linked recycled PET fibers, wherein the PET aerogel has a thermal conductivity of 0.030-0.050 W / m K. There is also provided a method of forming the PET aerogel.

The invention discloses a stirring and separating device for aerogel preparation, and relates to the technical field of aerogel preparation, the stirring and separating device comprises a stirring tank, a centrifugal assembly and a stirring assembly, the stirring tank is internally provided with the centrifugal assembly, and the bottom end of the centrifugal assembly is fixedly connected with the stirring assembly; the stirring assembly comprises a stirring assembly arranged in the stirring tank, and a driving assembly is arranged at the top end of the stirring assembly; the centrifugal assembly comprises a separation assembly, and an adjusting assembly is arranged on the side face of the separation assembly. According to the aerogel preparation device, uniform stirring and impurity cleaning in the aerogel preparation process can be achieved, and the aerogel production efficiency is reduced.

The invention relates to the technical field of fused salt phase change energy storage materials, and discloses a sodium alginate-assisted graphene-based fused salt phase change energy storage material and a preparation method thereof. The preparation method comprises the following steps: preparing few-layer graphene oxide; dispersing the few-layer graphene oxide and sodium alginate in a saturated or supersaturated sodium chloride solution, adding an inorganic cross-linking agent, and uniformly mixing to obtain composite hydrogel; the composite hydrogel is subjected to freezing and freeze-drying treatment, and composite aerogel is obtained; and carrying out heat treatment on the composite aerogel to obtain the sodium alginate-assisted graphene-based molten salt phase change energy storage material. According to the phase change energy storage material, the graphene oxide and the carbonized sodium alginate carbon skeleton form an aerogel matrix, the stability of a packaging structure is guaranteed, meanwhile, a large number of NaCl crystals are reserved, the proportion of molten salt is increased, the phase change stability is improved, the molten salt is not prone to leakage in the phase change energy storage process, the energy storage performance and the heat energy management efficiency are remarkably improved, and the application prospect is wide. Wide application prospects are realized.

The invention belongs to the technical field of building materials, and particularly relates to a building thermal insulation aerogel material and a preparation method, the aerogel material comprises the following components by mass: 25-35 parts of a silicon source, 40-80 parts of a solvent, 0.3-0.6 part of a catalyst, 4-13 parts of an aluminum source, 9-20 parts of reinforcing fibers, 4-10 parts of a modifier, and 20-40 parts of carrier fibers; the silicon source is ethyl orthosilicate or methyl trimethoxy silane; the solvent is absolute ethyl alcohol; the catalyst is hydrochloric acid or ammonia water; the aluminum source is aluminum nitrate nonahydrate or aluminum isopropoxide; the reinforced fibers are nano titanium dioxide fibers; the modifying agent is gamma-aminopropyl triethoxy silane or gamma-methacryloyloxy propyl trimethoxy silane, and the modifying agent is gamma-aminopropyl triethoxy silane or gamma-methacryloyloxy propyl trimethoxy silane; the carrier fiber is rock wool or mineral wool. According to the invention, the thermal insulation aerogel material for buildings, which is high in mechanical strength, good in weather resistance and excellent in thermal insulation performance, can be prepared, so that the requirements of the building industry on high-performance thermal insulation materials can be met.

The invention discloses a multi-site intelligent response type CO2 gas channeling prevention gel and a preparation method, and belongs to the field of chemical oil displacement, and the preparation method comprises the following steps: taking a carbon dioxide response type monomer, acrylamide and sodium acrylate as monomers, and adopting water-soluble free radical polymerization to prepare a CO2 response type copolymer; the CO2 response type copolymer, a cross-linking agent, a stabilizer, a retarder and formation water are prepared into a polymer cross-linking agent mixed solution, a cross-linking reaction is carried out under the conditions of formation temperature and mineralization degree, and the multi-site intelligent response type CO2 gas channeling prevention gel is obtained. The gel effectively solves the problems that a traditional anti-channeling agent is poor in injectivity in a low-permeability and ultra-low-permeability oil reservoir and cannot achieve deep channeling sealing, CO2 gas channeling fractured channels can be effectively blocked, the carbon dioxide oil displacement effect is remarkably improved, and key technical support is provided for large-scale application of carbon dioxide displacement.

Belonging to the technical field of high temperature resistant composite aerogel, the invention provides a bicontinuous network composite aerogel with large length-diameter ratio shell-core structure in-situ embedded porous silicon carbide foam, which comprises a shell-core structure and a skeleton, the shell-core structure comprises an inner core and a shell layer, the shell layer is of a ceramic silicone rubber layer structure, and the inner core is a SiC nanowire of a continuous network structure; the framework is porous silicon carbide foam with a continuous network structure; wherein the core-shell structure is embedded on the skeleton structure in situ to form an interspersed bicontinuous network composite structure. The invention also provides a preparation method, according to the method, by precisely designing the mechanical distribution of the nanowires, the ceramic skeleton and the porous structure on the coupling characteristic, the multifunctionality, energy absorption and high temperature resistance of the composite aerogel are synergistically optimized, and the composite aerogel has remarkable advantages in the aspects of regulation and control of sound waves, electromagnetic waves and light waves, high-temperature oxidation resistance and vibration resistance. Therefore, the composite material has wide application potential in the fields of aerospace, military protection, electronic equipment, building shock insulation and the like.

The invention provides a preparation method of carbon-loaded MOF (Metal Organic Framework) derivative aerogel. The preparation method comprises the following steps: S1, preparing ZIF-67 with a rhombic dodecahedron structure; s2, preparing cellulose aerogel; s3, preparing a ZIF-67 at cellulose compound by using the ZIF-67 with the rhombic dodecahedron structure and the cellulose aerogel; s4, the ZIF-67 at cellulose compound is carbonized, and the carbon-loaded MOF derivative aerogel is obtained. The problems that in the prior art, a wave-absorbing material is poor in performance, does not have good heat insulation performance, and is high in raw material cost are solved.

The invention belongs to the field of preparation processes of nano porous materials, and relates to a preparation method of a low-cost high-entropy alloy aerogel electrocatalytic material. The preparation method comprises the following steps: uniformly stirring and mixing five metal salt solutions, adding a reducing agent, and finally obtaining the low-cost, high-activity and multifunctional high-entropy alloy aerogel material by virtue of a freeze-thawing technology, solvent replacement and a freeze-drying method. The invention has the advantages of low material cost and convenient process, and also has the advantages of low energy consumption, lower cost, multifunction integration, higher stability and easy realization of large-scale production.

The invention discloses a preparation method of biomass fiber aerogel for micro-plastic adsorption, and belongs to the field of micro-plastic adsorption. The preparation method comprises the following steps: (1) preparing a covalent cross-linking mixture by taking biomass nanofibers as a base material; (2) carrying out foaming treatment on the covalent cross-linking mixture by using a surfactant; (3) carrying out circulating freezing and thawing treatment on the covalent cross-linking mixture subjected to foaming treatment; and (4) performing normal-pressure drying on the covalent cross-linking mixture subjected to circulating freezing and thawing treatment to obtain the biomass fiber aerogel. The biomass fiber aerogel material obtained by the invention has high porosity and can effectively adsorb various micro-plastics, and the preparation process used in the invention does not need critical condition drying equipment, so that the preparation cost and period of aerogel are reduced, and the biomass fiber aerogel material has industrial large-scale production potential.

The invention relates to the technical field of silicon-aluminum aerogel preparation, in particular to a method for preparing high-temperature-resistant silicon-aluminum aerogel by using a coal gangue one-step method, which comprises the following steps: S1, crushing, grinding and sieving coal gangue, mixing the coal gangue with an alkaline solid, and calcining to obtain alkali fusion powder; s2, the alkali fusion powder is subjected to acid treatment and suction filtration, and a silicon-aluminum solution is obtained; s3, adding polystyrene-coated zirconium oxide particles into the silicon-aluminum solution, and sequentially carrying out gelation, primary aging, solvent washing, water washing and secondary aging; s4, washing, replacing and modifying the gel; and S5, drying the hydrophobic wet gel obtained in the step S4 at normal pressure to obtain the silicon-aluminum aerogel. The silicon-aluminum aerogel prepared by the method has the advantages of low density, good thermal stability, high specific surface area, strong hydrophobic property and high strength.

The invention discloses a high-adhesion solid-state capacitor carbon foil production process, and relates to the technical field of solid-state capacitor carbon foils. The preparation method comprises the following steps: generating a three-dimensional graphene layer in situ on the surface of an aluminum foil by a chemical vapor reduction method; secondly, the graphene layer is modified by utilizing aluminum nitrate ammonium nitrate, and then the Ni-Al layer with a continuous lamellar structure is prepared on the graphene layer through electrochemical deposition, so that active sites are provided, and the ion diffusion capability of the carbon foil is remarkably improved; finally, mixing ethylene diamine tetraacetic acid dipotassium salt and corn starch to prepare nitrogen-doped carbon aerogel, preparing the nitrogen-doped carbon aerogel into powder, and coating the surface of the Ni-Al layer with the powder to prepare a four-layer composite carbon foil; by doping nitrogen atoms, the surface chemical performance of the carbon aerogel material can be changed, the wettability of an electrode is improved, the diffusion rate of electrolyte ions is increased, and the specific capacity of the material is increased, so that the overall electrochemical performance of the carbon foil is improved. The four-layer composite carbon foil prepared by the invention has the effects of high adhesion and excellent electrochemical performance.

The invention provides a method for preparing aluminum oxide-silicon oxide composite aerogel through normal-pressure drying. The method comprises the following steps: respectively preparing silica sol and aluminum sol by taking tetraethoxysilane as a silicon source and aluminum chloride hexahydrate as an aluminum source, mixing the silica sol and the aluminum sol, heating and stirring to obtain mixed sol, adding epoxypropane into the mixed sol, and standing until the sol does not flow to obtain composite gel; soaking the composite gel in ethanol and normal hexane in sequence for aging and solvent exchange; and uniformly mixing a modifier, a catalyst and a solvent to prepare a modification solution, soaking the composite gel in the modification solution for modification, and then washing and drying through normal hexane to obtain the aluminum oxide-silicon oxide composite aerogel. According to the preparation method, inorganic aluminum chloride hexahydrate is used as an aluminum source, trimethylethoxysilane is used as a modifier, and the aluminum oxide-silicon oxide composite aerogel is prepared through normal-pressure drying. The prepared aluminum oxide-silicon oxide composite aerogel still has a mesoporous structure and a high specific surface area after being subjected to high-temperature heat treatment.

The invention discloses a preparation method of a low-cost high-temperature-resistant silicon oxide aerogel composite material, which selects high-quality and low-cost inorganic silica sol as a silicon source, is doped with a functional additive and is compounded with a fiber reinforced material, so that the problems of high silicon source cost, poor high-temperature resistance, low strength, poor flame retardance and the like of the silicon oxide aerogel material are solved. Meanwhile, the material has certain flexibility and is convenient to construct.