337 results about "Supercritical drying" patented technology

The invention discloses a method for preparing hydrophobic SiO2 aerogel through in-situ polymerization. The method comprises the following steps: (1) uniformly mixing and stirring an alcohol solvent, a silicon source, water, an in-situ modifier and a catalyst to obtain a mixed solution; (2) adding an acid adjusting solution into the obtained mixed sol solution to hydrolyze the mixed sol solution, and adding an alkali adjusting solution to polymerize the mixed sol solution; (3) gum dipping: dipping the silica sol solution into the inorganic fiber material through a gum dipping process to obtain a compound of the silica sol and the inorganic fiber material, and standing to obtain a gel composite material; (4) aging: adding the obtained composite gel material into an aging liquid mixed solution; and (5) immersing the aged wet gel in an organic solvent, and then feeding into a supercritical drying kettle for supercritical drying treatment to obtain the SiO2 aerogel composite material. By adopting an in-situ polymerization method, the use of a hydrophobic modifier is reduced, the aerogel preparation process period is shortened, and the production process is simple.

The invention provides quantum dot aerogel, a quantum dot light-emitting device and a preparation method thereof, and the preparation method comprises the following steps: adding a silane coupling agent into quantum dots to form modified quantum dots with silanol groups on the surfaces; uniformly stirring a silicon dioxide precursor and absolute ethyl alcohol, slowly adding deionized water and a catalyst, and stirring to form silicon dioxide sol; adding the modified quantum dots into silicon dioxide sol to form a mixed solution; placing the mixed solution in a closed container, and standing to form gel; putting the gel into absolute ethyl alcohol for aging treatment; and carrying out supercritical drying treatment on the aged gel to obtain the quantum dot aerogel composite material. The light-emitting performance of the quantum dots and the heat insulation performance of the aerogel are perfectly combined, the high temperature resistance and blue light resistance of the quantum dot aerogel composite material film layer can be greatly improved, the preparation method is simple, and the application range of the quantum dots can be greatly widened.

The invention discloses a wear-resistant hard alloy material and a preparation method thereof, and particularly relates to the field of alloy materials.The wear-resistant hard alloy material comprises tungsten carbide, cobalt powder, graphene aerogel fragments, coconut shell carbonized porous carbon, yttrium oxide and auxiliaries, and a multi-scale reinforcing system is constructed by optimizing the proportion. According to the preparation method, supercritical drying is combined with a microwave reaction sintering process, and material densification is realized through gradient temperature control and steam concentration accurate regulation and control in a specific atmosphere. Graphene aerogel fragments and porous carbon form a three-dimensional interpenetrating network, so that the wear resistance and the conductivity are synergistically improved; yttrium oxide is segregated at a grain boundary to form a high-temperature anti-oxidation barrier; the gradient sintering process effectively eliminates internal stress and inhibits abnormal growth of grains. The technical bottleneck that wear resistance and toughness of traditional hard alloy are difficult to synergistically improve is broken through, excellent conductivity and high-temperature stability are achieved, and the industrial problems that wear resistance / toughness is inverted, a conductive network is low in efficiency, and the high-temperature stability is poor are solved.

The invention relates to the related field of heat insulation composite material processing, in particular to an aerogel heat insulation pipe shell and a preparation method and application thereof, and the aerogel heat insulation pipe shell is composed of a fiber needled felt without a binder and silicon dioxide aerogel. The manufacturing method comprises the steps of fibrofelt cutting and pre-rolling, sol preparation, rotary dynamic gel forming, supercritical drying, two-end trimming and opening treatment, and the tubular prefabricated part which is accurate in size, convenient and fast to install and capable of replacing aerogel felt is mainly applied to various pipelines and cylindrical equipment needing heat insulation and insulation. Loss of on-site construction materials and consumption of auxiliary materials can be effectively reduced, the construction period is shortened, and the heat insulation engineering quality is improved.

The invention provides a secondary battery, which comprises a pole piece, a diaphragm and an electrolyte, the pole piece comprises a current collector and an active material layer arranged on at least one side of the current collector, and the active material layer comprises an active material, a conductive agent and a binder; the value range of the effective ion migration rate of the pole piece is 0.02 to 0.5; according to the invention, the pole piece prepared under high solid content is subjected to freeze drying or supercritical drying, so that the solvent in the pole piece leaves the pole piece, and meanwhile, the adhesive does not migrate along with the solvent, and the uniform distribution of the adhesive in the pole piece is maintained; meanwhile, under the condition that the electrode plate has higher surface density and higher compaction density, distribution of a pore structure in the electrode plate is maintained, due to the special process effect of freeze drying or supercritical drying, the high pore structure of the electrode plate can be maintained, or pores in the electrode plate can be further improved through pore forming, the migration rate of ions in the electrode is increased, and the service life of the electrode plate is prolonged. Therefore, the battery has relatively high energy density and better electrochemical performance.

The invention discloses a polyimide aerogel fiber as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: 1, synthesizing a polyamide acid solution; 2, adding acrylic acid, polyethylene glycol, a photoinitiator and a cationic surfactant into the polyamide acid solution, and mixing to form a spinning solution; step 3, carrying out wet spinning on the spinning solution, and then entering a coagulating bath to form initial gel fibers; step 4, performing ultraviolet light curing on the initial gel fibers to form gel fibers; and 5, carrying out chemical imidization treatment on the gel fiber, then carrying out stretching treatment, and carrying out supercritical CO2 drying after solvent replacement so as to obtain the polyimide aerogel fiber. Under the synergistic effect of multiple components of the spinning solution, the polyimide aerogel fiber is endowed with excellent mechanical properties and high porosity in cooperation with gelation and ultraviolet curing in a coagulating bath, and the polyimide aerogel fiber can be applied to preparation of heat insulation materials.

The invention relates to the technical field of thermal insulation material preparation, and discloses an aerogel composite metal film thermal insulation material and a preparation method thereof, and the preparation method comprises the following steps: metal film surface treatment; performing fiber-metal film needling; through mold forming and porosity control, a fiber-metal film prefabricated part with a specific shape and a high-porosity structure is prepared; soaking and aging the sol, realizing efficient permeation and filling of the sol in the fiber-metal film prefabricated member through staged pressure control, and completing conversion from the sol to gel in a low-temperature aging stage, so that a uniform and stable nano-particle continuous phase is constructed in the fiber-metal film prefabricated member, and a gel-containing fiber-metal film prefabricated member is formed; the preparation method comprises the following steps: preparing a fiber-metal film preform, performing supercritical drying, thoroughly removing a solvent under the condition of not damaging a gel network structure by utilizing the characteristic that alcohol fluid has no gas-liquid interface surface tension in a supercritical state aiming at the fiber-metal film preform containing gel, and further preparing the aerogel composite metal film heat insulation material.

The invention discloses a method for increasing the phase transition temperature of Al2O3 aerogel through grain boundary pinning and nano-structure strengthening, which comprises the following steps: co-hydrolyzing an aluminum source, yttrium salt, a silicon source and magnesium salt to form sol through the coordination of double mechanisms of grain boundary pinning and nano-domain isolation, and carrying out gradient heating aging, mixed medium supercritical drying and two-stage sintering to obtain the phase transition temperature of the Al2O3 aerogel. The gamma-alpha phase transition temperature of the Al2O3 aerogel is greater than or equal to 1300 DEG C. The specific surface area of the aerogel after heat treatment at 1300 DEG C is larger than 100 m / g, the process cost is controllable, and the aerogel is suitable for industrial production and can be applied to extreme environments such as a spacecraft thermal protection system and a high-temperature industrial furnace lining.

The invention relates to a covalent organic framework modified cellulose nanofiber composite diaphragm which is characterized in that cellulose nanofiber is used as a matrix, an amide type or amine type covalent organic framework layer is grown on the surface in situ, the loading capacity of a covalent organic framework is regulated and controlled, and a hierarchical pore structure with gradient pore diameter is constructed; the preparation method comprises the following steps: synthesizing a covalent organic framework precursor bonded with an imine bond on the surface of cellulose nanofiber in situ by a one-pot method under an acidic mixed solution and a heating condition, and regulating and synchronously reducing to convert into an amine type covalent organic framework; or after the imine bond bonded covalent organic framework is synthesized in two stages, the imine bond bonded covalent organic framework is selectively converted into an amide type covalent organic framework through oxidation modification; the obtained cellulose nanofiber compound coated with the covalent organic framework is subjected to the processes of film forming, solvent replacement, supercritical drying and the like, and the composite diaphragm is obtained; the diaphragm has excellent electrolyte wettability, high liquid absorption rate, good ionic conductivity and thermal stability, and can promote uniform transmission of lithium ions and inhibit growth of lithium dendrites.

The invention belongs to the technical field of coatings, and discloses a 600 DEG C heat insulation coating containing In2O3 and rutile type TiO2 aerogel and a preparation method of the 600 DEG C heat insulation coating. The coating is composed of an organic-inorganic compound adhesive, In2O3 at rutile type TiO2 aerogel, hollow glass beads, HAP ultra-long nanowires and auxiliaries, the aerogel is prepared by combining sol-gel with CO2 supercritical drying, and the aerogel is calcined at 800 DEG C to form a rutile crystal form. The compound adhesive is prepared from alkaline silica sol, modified organic silicon emulsion and a silane coupling agent through hydro-thermal synthesis. The coating is prepared by dispersing all the components at a high speed, heat conduction is inhibited by using aerogel nanopores, infrared radiation is reflected synergistically by rutile TiO2 and In2O3, and heat convection is blocked by a lock catch structure formed by hollow glass beads and HAP nanowires. The thermal conductivity of the obtained coating at 600 DEG C is as low as 0.035-0.044 W / (m.K), the coating has excellent temperature resistance, thermal shock resistance and full-wave band heat reflection capacity, and the technical problems of high-temperature phase change, structural collapse and poor thermal stability of a traditional coating are solved.

The present invention discloses a gradient aerogel composite material and its preparation method. The gradient aerogel composite material is prepared by preparing a sunscreen slurry, applying the slurry, hot-pressing fibers, impregnating and aging the sol, supercritical drying, and heat treating. The gradient aerogel composite material prepared using the present invention is ultra-lightweight, high-temperature resistant, exhibits ultra-low thermal conductivity over a wide temperature range, and can be formed into large-scale thermal insulation components. It can be used as a thermal insulation material in aerospace, nuclear power, shipbuilding, and other fields.

The invention belongs to the technical field of aerogel, and relates to a method for preparing aerogel by carbon dioxide supercritical drying based on gradient drying control, which comprises the following steps: preparing basic catalytic liquid, preparing silica sol, gelatinizing and aging, performing surface modification, pretreating a drying system, placing and sealing materials, replacing and boosting carbon dioxide, and performing gradient depressurization and material taking. After pressure reduction is completed, aerogel is obtained; by accurately controlling the temperature, the pressure and the pressure increasing and decreasing rate in the carbon dioxide supercritical drying process, skeleton collapse and size shrinkage caused by capillary stress are effectively avoided, and the morphology retentivity and the structural integrity of the aerogel are remarkably improved. The obtained aerogel is light blue and semitransparent, has no cracks on the surface, has the specific surface area of more than or equal to 850m < 2 > / g and the heat conductivity of less than or equal to 0.020 W / (m.K), has excellent heat insulation performance, structural stability and mechanical strength, and is suitable for the fields of building energy conservation, aerospace, microelectronic packaging, flexible heat management and the like.

The invention relates to a chitosan-collagen synergistic self-assembly fiber material and a preparation method thereof, and belongs to the technical field of biological fiber materials. According to the method, the mass ratio of chitosan to collagen is controlled, co-assembly is induced through hydrogen bonds and electrostatic interaction in a low-temperature PBS solution, and then glutaraldehyde crosslinking, gradient dehydration and supercritical drying are performed to prepare the freeze-dried fiber. The obtained material completely retains the triple helix conformation of collagen, and has excellent conformation stability and enzymolysis resistance. The mechanical strength of the composite fiber is remarkably improved, and the composite fiber has excellent antibacterial property and cell affinity. The process does not need a toxic cross-linking agent, the operation is simple and convenient, and the prepared fiber is suitable for the high-end biomedical fields of tissue engineering scaffolds, intelligent antibacterial dressings, degradable nerve conduits and the like.

The invention discloses a preparation method of a 1200 DEG C temperature-resistant thermal insulation coating containing ATO-Nb2O5-coated Al2O3 aerogel, and belongs to the technical field of coatings. According to the method, the ATO-Nb2O5-coated Al2O3 aerogel is prepared through a gradient coating technology, nanometer ATO particles form an infrared reflection barrier, Nb2O5 inhibits Al2O3 high-temperature crystal form transformation through a pinning effect, and CO2 supercritical drying (11-14 MPa, 30-45 DEG C and 4-6 h) is combined to obtain the aerogel with high porosity and the alpha phase transition temperature larger than or equal to 1200 DEG C. An organic-inorganic compound adhesive (alkaline silica sol, potassium silicate and modified organic silicon emulsion) is used as a matrix and cooperates with hollow ceramic microbeads and superfine mullite fibers to construct a multi-scale heat insulation system, and the coating is prepared through high-speed dispersion. The heat conductivity coefficient of the coating at 25 DEG C is as low as 0.039 W / (m.K), the temperature resistance reaches 1225 DEG C, the coating has thermal shock resistance and low heat conductivity, the problems of high-temperature phase change densification and coating cracking of traditional Al2O3 aerogel are solved, and the coating is suitable for ultrahigh-temperature heat insulation protection of industrial equipment.

The invention discloses a high-toughness thermal bridge blocking material and a preparation method thereof, namely a metal fibrofelt reinforced aerogel composite material and a preparation method thereof, and belongs to the technical field of thermal insulation materials. The preparation of the metal fibrofelt reinforced aerogel composite material is realized by adopting the processes of metal fibrofelt modification, fiber prefabricated part forming, sol dipping and aging, supercritical drying, heat treatment and the like. The composite material prepared by the invention has the characteristics of light weight, low thermal conductivity, high temperature resistance, high pressure bearing capacity, high toughness and the like, and can be used as a thermal bridge blocking material in the fields of aerospace, thermal equipment and the like.

The invention provides a hollow fiber reinforced aerogel composite material and a preparation method thereof, and relates to the field of aerogel materials. The preparation method of the hollow fiber reinforced aerogel composite material comprises the following steps: preparation of aluminum silica sol, modification compounding, vacuum impregnation, gel aging and supercritical drying. According to the hollow fiber reinforced aerogel composite material and the preparation method thereof, the sound insulation performance of the aerogel material can be effectively improved on the premise of overcoming the existing defects (the defect of a porous structure of aerogel, weak binding force among aerogel particles and thermal stress caused by mismatching of thermal expansion coefficients of aluminum and silicon components) of the aerogel material; the strength, the toughness and the heat insulation performance of the aerogel material are synchronously improved.

The invention relates to aerogel with high heat insulation performance and a preparation method thereof, and belongs to the technical field of aerogel materials. The aerogel is prepared from a silicon source, nano heat insulation particles, a surface modifier, a catalyst and a solvent. The nano heat insulation particles are a compound of zirconium dioxide and hollow glass beads, and the surface modifier is a mixture of trimethylchlorosilane and gamma-aminopropyltriethoxysilane. The preparation method comprises the steps of sol preparation, modification treatment, gelation, aging and supercritical drying. Through compounding and synergistic effects of specific components, the mesoporous network structure of the aerogel is remarkably optimized, so that the aerogel has ultralow normal-temperature thermal conductivity, relatively high compression strength and excellent thermal stability, and the problem that heat insulation performance and mechanical strength of traditional aerogel are difficult to consider at the same time is solved; the method is suitable for the fields of building insulation, industrial pipelines and aerospace.

The invention discloses a preparation method of an aerogel laminated composite heat insulation pad, and relates to the technical field of aerogel heat insulation pads, and the preparation method comprises the following steps: mixing and dispersing a silane precursor and absolute ethyl alcohol, adding a basic catalyst, hydrolyzing to generate sol, and aging to form prefabricated sol; adding a flame retardant, a smoke retardant and reinforced fibers, dispersing and gelatinizing, and carrying out supercritical drying to obtain an aerogel block; and coating basalt fiber non-woven fabric with the aerogel slurry to form a base layer, laminating a plurality of layers, and carrying out hot-pressing curing, cooling, post-curing, cutting and edge covering to obtain the composite heat insulation pad. According to the invention, by optimizing the ratio of silane and a drying process, the pore structure and the thermal stability of the aerogel are obviously improved; the flame-retardant, mechanical and heat-insulating properties are improved through multi-component collaborative design, and the obtained heat-insulating pad has the characteristics of low heat conductivity, high strength, excellent flame retardance and light weight, and is suitable for multiple heat-insulating and flame-retardant fields.

The invention relates to the technical field of preparation of high polymer materials and intelligent response materials, in particular to a preparation method of polyacrylamide for treatment. And constructing a quaternary polymerization system with acrylamide, a temperature-sensitive monomer and a zirconium-based metal organic framework-graphene quantum dot composite material. Magnetic response interpenetrating network gel is formed by induction of a photo-magnetic synergistic field, bacterial cellulose nanofibrils and a calcium silicate layered structure are introduced through a biomimetic mineralization technology, and the hierarchical porous carrier is prepared by combining a microfluidic crushing technology and a supercritical drying technology. Finally, through an intelligent regeneration mechanism of bimetal coordination activation and high-frequency magnetic field triggering, the material is endowed with multiple stimulation response characteristics, high adsorption capacity and in-situ regeneration capacity, and the mechanical strength and the salt resistance are remarkably improved through a pearl-layer-like micro-nano laminated structure. The method is suitable for industrial wastewater advanced treatment and emergency pollution repair scenes.

The invention relates to a composite aerogel for water treatment and a preparation method thereof, and the preparation method comprises the following steps: activating graphene oxide, and then carrying out amidation reaction on the activated graphene oxide, aminated beta-cyclodextrin and hexamethylenediamine to obtain modified graphene; then carrying out hydrothermal reaction on the GO / BiOCOOH composite material, a Bi < 3 + > solution and formamide to obtain a modified GO / BiOCOOH composite material; crosslinking in a lignin aqueous solution to obtain hydrogel; and finally, performing supercritical drying to obtain the composite aerogel. The preparation method has the beneficial effects that by constructing macroscopic blocky aerogel, the problems that a powder material is easy to lose and difficult to recycle are effectively solved; the high photocatalytic activity is still kept under the condition that iodine doping is not used, and the possibility of secondary pollution of free iodine to a water body due to instability of the material is reduced; under the synergistic effect of the aerogel and the photocatalytic reaction, the efficient proceeding of the adsorption and desorption-photocatalytic reaction is realized; the material is high in stability, easy to recover, capable of being recycled through simple desorption, high in cycle index and long in service life.

The invention relates to a flame-retardant composite aerogel and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing a chitosan aqueous solution with an MXene dispersion liquid to obtain a mixed solution, dropwise adding an alkali liquid to obtain a black first suspension, and concentrating to obtain a second suspension; adding a cross-linking agent into the second suspension, and performing freezing cross-linking to obtain chitosan / MXene frozen gel; the chitosan / MXene frozen gel is subjected to unfreezing, solvent replacement and drying, and the flame-retardant composite aerogel is obtained. The composite aerogel obtained by the invention is good in mechanical stability and has excellent flame retardant property and oil absorption property; the preparation method is simple, no ultralow-temperature freeze drying equipment or supercritical drying equipment is needed, the preparation cost is low, the size is not limited, and large-scale production can be achieved.

The invention discloses a method for preparing graphene aerogel through a multistage intercalation-supercritical drying method, and belongs to the technical field of new energy material recovery and nano material preparation. The method comprises the following steps: treating the waste lithium battery to obtain graphite slag; the preparation method comprises the following steps: soaking graphite slag in a KNO3 solution and a FeCl3 solution, carrying out instantaneous expansion in an inert atmosphere to obtain pre-stripped graphite, carrying out oxidation to obtain a graphene oxide suspension, adding sodium lignin sulfonate, and carrying out a hydrothermal reaction to obtain reduced graphene; and placing the reduced graphene dispersion liquid in supercritical CO2 for drying treatment. According to the preparation method, the graphite negative electrode in the waste lithium battery is used as a raw material, and a multistage intercalation stripping process and a supercritical drying technology are combined, so that the stripping efficiency of graphene and the structural stability of aerogel are remarkably improved. The obtained product has high specific surface area, excellent conductivity and mechanical strength, and can be applied to the fields of supercapacitors, catalytic carriers and the like.

The invention relates to a method for treating printing and dyeing wastewater. The method comprises the following steps: neutralization regulation, primary filtration for removing scum, decoloration and flocculation, secondary filtration, pH regulation, catalytic degradation under visible light, MBR membrane treatment and discharge. The printing and dyeing wastewater treatment process provided by the invention is compact in link, the first-stage filtration, decoloration flocculation and second-stage filtration in the treatment process all adopt conventional technical means in the field, the operation is simple and convenient, the cost is low, and a special bismuth-based aerogel composite material is used as a catalyst for photocatalytic degradation at the rear end; the aerogel is prepared by cross-linking a modified graphene oxide / BiOCOOH composite photocatalyst with an acrylic polymer matrix and then carrying out supercritical drying, so that macroscopic immobilization of a nano catalyst is realized. According to the method, the technological process is compact, the cationic dye which is difficult to biologically treat can be efficiently degraded, the industrial problems that a powder catalyst is easy to lose and difficult to recycle are solved, key indexes such as COD and chromaticity of the treated wastewater are remarkably reduced, and the treated wastewater can be discharged after reaching the standard.

The invention discloses a preparation method of a nano-porous polyimide aerogel sandwich cylindrical structure and the structure, and belongs to the field of aerogel sandwich structure preparation. In order to solve the problem that an existing sandwich structure is difficult to consider mechanical and heat-insulating properties, the scheme comprises the steps that an inner-layer cylindrical shell mold and an outer-layer cylindrical shell mold which are coaxially arranged are constructed, and an annular gap is formed; the preparation method comprises the following steps: preparing a polyamide acid precursor solution, performing chemical imidization, injecting the polyamide acid precursor solution into a gap, regulating interface combination through gel curing, solvent replacement and supercritical drying triple contractility, and combining interference fit assembly to form an inner-layer cylindrical shell / aerogel sandwich layer / outer-layer cylindrical retaining sleeve integrated structure. According to the method, the blank of the integrated forming technology of the aerogel sandwich cylinder structure is solved, and the prepared structure has light weight, ultralow heat conductivity and mechanical stability, is suitable for the scenes of aerospace, weaponry, industrial pipeline heat insulation and the like, and has important industrial value for improving the structural performance and energy utilization efficiency under complex working conditions.

The invention provides a preparation method of ultra-low thermal conductivity silicon-based aerogel, and relates to the field of aerogel material preparation, and the preparation method comprises the following steps: S1, preparing a component A and a component B. The component A is prepared by fully mixing a silicon source, a modified silicon dioxide seed crystal, absolute ethyl alcohol and deionized water, then slowly adding an acid catalyst, and carrying out hydrolysis; the component B is a basic catalyst solution obtained by uniformly mixing deionized water and stronger ammonia water; step S2, gelling: fully mixing the component A and the component B to obtain wet gel, and then mixing the wet gel with a fiber felt to obtain a wet gel felt; step S3, aging; and S4, performing supercritical drying. According to the method, by introducing the modified silicon dioxide seed crystal, the thermal conductivity of a solid structure of the aerogel is effectively reduced, meanwhile, formation of macropores, communicating pores and the like is inhibited, and the performance of the aerogel is improved.

The invention discloses a methane dry reforming catalyst and a preparation method thereof, and belongs to the technical field of catalysts.The catalyst is composed of 480 parts to 600 parts of Fe2O3, 60 parts to 75 parts of NiO, 1020 parts to 1530 parts of Al2O3, 16.2 parts to 82.5 parts of La2O3 and 9 parts to 18 parts of Gd2O3, and the catalyst is of an integral aerogel structure with a honeycomb-shaped or latticed macroscopic morphology; the preparation method comprises the following steps: S1, preparing a precursor solution; s2, adding a gel accelerant; s3, carrying out integral gel forming; s4, aging the wet gel; s5, solvent replacement; s6, performing supercritical drying; s7, calcining; according to the invention, active site design, a structure stabilization strategy and material form innovation are closely combined, and the prepared monolithic aerogel oxygen carrier not only shows a high CH4 / CO2 conversion rate and an ideal H2 / CO ratio, but also has excellent cycle stability and extremely low bed pressure drop; the core problems that in the prior art, the activation capacity and the carbon removal capacity are not matched, the high-temperature cycling stability is poor, and the engineering applicability of a powder material is limited are effectively solved.

This application relates to the field of oxide target technology, specifically disclosing a high-density, high-uniformity IGO target and its preparation method. The preparation method of the high-density, high-uniformity IGO target includes the following steps: [The text abruptly shifts to a different topic]...containing In... 3+ Ga 3+ A mixed solution of metal ions and ammonia solution is mixed to obtain a precursor precipitate, which is then allowed to stand for a preset aging time. The aged precursor precipitate is then subjected to supercritical drying and calcination to obtain IGO powder. The IGO powder is mixed with a sintering aid and then subjected to ball milling, air classification, molding, cold isostatic pressing, spark plasma sintering, and heat treatment to obtain the IGO target material. The IGO target material obtained in this application has uniform composition, high density, and stable microstructure. The transparent conductive film prepared using this target material has high visible light transmittance and excellent conductivity, solving the problems of uneven composition, low density, and poor quality of sputtered films in existing target materials.

The application discloses a method for preparing ZrSiO4 aerogel by sol-gel combined supercritical drying, and the wet gel is prepared by using a silicon source, a zirconium source and a crosslinking agent as raw materials, then the low-density and high-porosity dry gel is obtained by CO2 supercritical drying, and then the control of the gel component and structure is realized by controlling the heat treatment process, so that the ZrSiO4 aerogel with low density, high porosity, excellent high-temperature resistance and good thermal stability is obtained. Through the control of the component, the gel process and the heat treatment process, the controllable preparation and performance regulation of the ZrSiO4 aerogel are realized.

The invention relates to an in-situ nanowire skeleton reinforced aerogel composite material and a preparation method thereof. The preparation method comprises the following steps: in-situ growth of a nanowire skeleton from quartz fiber felt, preparation of silica sol, sol impregnation and aging, and supercritical drying. The internal pores of the prepared nanowire skeleton reinforced aerogel composite material are refined and segmented by an in-situ grown nanowire network, the interface bonding of nanowires and aerogel is improved through interlocking, fracture under the action of external force is prevented, the structural performance of the aerogel composite material is improved, and the performance of the aerogel composite material is improved. The high-temperature-resistant and low-thermal-conductivity nanowire porous framework composite silicon oxide aerogel thermal insulation material is prepared by a simple and controllable process.

The application relates to the technical field of functional materials, and discloses a conductive polymer composite material and a preparation method thereof, which comprises the following steps: providing an oil phase solution comprising an organic solvent and a polymer, and a water phase solution comprising water, graphene oxide and carbon nanotubes; mixing the oil phase solution with the water phase solution, performing homogenization treatment, and then performing supercritical CO2 drying on the obtained graphene oxide stable Pickering emulsion to remove the organic solvent; then adding a reducing agent to perform a reduction reaction; and finally performing heating drying to remove water, so that the conductive polymer composite material is obtained. In the application, the carbon nanotubes are used as conductive fillers, the graphene oxide stable Pickering emulsion is used as a template, and the supercritical anti-solvent method is used to remove the organic solvent; then the graphene oxide is reduced into reduced graphene oxide with conductivity, and the reduced graphene oxide and the carbon nanotubes form double conductive fillers, so that the conductivity of the prepared conductive polymer composite material can reach 211 S.m ‑1 under the condition of low conductive filler content.