126 results about "Supercritical drying" patented technology

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 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 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 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 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 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.

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 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.

The application discloses a kind of superhigh temperature self-adaptive insulated cable of composite and preparation method thereof, which uses carbon nanotube fiber bundle as conductor, multiple layer aerogel-ceramic nanofiber composite felt as insulator, stress buffer layer formed by negative thermal expansion coefficient material is arranged between layers, and the outer sheath is chemical vapor infiltration SiC carbon fiber braided sleeve.The cable of the application has the advantages of ultra-light, high thermal stability, self-adaptive sealing and strong thermal shock resistance, and is suitable for extreme high temperature environment above 800 DEG C;The preparation method includes supercritical drying, pre-stretching winding and other key processes, to realize the high performance and reliability of the cable.

The application provides a kind of co-woven three-dimensional interpenetrating network reinforced aerogel composite material and its preparation method and application.The composite material is composed of reinforced phase and matrix phase, the reinforced phase is three-dimensional interpenetrating network fiber felt prepared by integrated weaving or needling process, containing hollow fiber and solid quartz fiber, which are interpenetrated and entangled in three-dimensional space to form a continuous network skeleton;The matrix phase is silica-based aerogel filled and coated network pores.The preparation method includes the steps of forming, sol impregnation, gelation and aging, supercritical drying and other steps of co-woven preform, and can also include hydrophobic post-processing.The material has the characteristics of light weight, high strength, ultra-low thermal conductivity and excellent wave-transparent performance, and is suitable for hypersonic aircraft radome, antenna window, radar fairing and satellite communication wave-transparent components, which can meet the requirements of load bearing, heat insulation and wave-transparent integration.

A substrate processing apparatus includes: a processing container including an internal space where a supercritical drying process is performed on a substrate having a surface to which a liquid is attached, by using a processing fluid in a supercritical state; a housing including a processing region where the processing container is disposed, and a carry-in / out region where carry-in / out of the substrate is performed; a delivery section that is provided in the carry-in / out region to deliver the substrate to / from a substrate transfer arm entering the carry-in / out region from an outside of the housing; a substrate transfer section that transfers the substrate between the delivery section and the processing container; and a gas supply provided in the carry-in / out region to supply a dry gas to the processing container.

The invention discloses a forming method of an aerogel heat insulation part, which comprises the following steps: selecting a needling die, a forming die and a porous pressing plate according to the shape and the size of a target heat insulation part, needling and forming a fiber preform on the needling die, coating the preform with demolding cloth, and sewing at the edge; the prefabricated body is arranged in a forming mold, the mold gap is adjusted twice, two-step vacuum-assisted sol-gel dipping compounding is conducted, gel aging, solvent replacement and supercritical drying are completed together with the mold, and a finished product is obtained after demolding. According to the method, machining is not needed, fiber completeness can be kept, thin part machining cracking is effectively avoided, the product thickness precision and surface flatness are improved, the defects of air holes, insufficient pouring and the like are overcome, and the method is suitable for preparing thin aerogel heat insulation parts of various structures.

The invention discloses a synthesis process of tungsten hexafluoride, and relates to the technical field of special gas synthesis. The process comprises the following steps: mixing ammonium fluoride and hydrofluoric acid to prepare an activation solution, carrying out ultrasonic activation treatment on tungsten powder to obtain pretreated tungsten powder, and reacting the pretreated tungsten powder with fluorine gas at a certain temperature and pressure to prepare a liquefied crude product tungsten hexafluoride; the preparation method comprises the following steps: by taking aluminum sec-butoxide and the like as raw materials, carrying out sol-gel and ethanol supercritical drying and calcining to prepare highly porous activated aluminum oxide; gasifying the crude tungsten hexafluoride, adsorbing with activated aluminum oxide, and rectifying to obtain purified tungsten hexafluoride liquid; and finally, dissolving in liquid sulfur dioxide, treating under illumination with the wavelength of 395nm, and carrying out distillation separation to obtain high-purity tungsten hexafluoride. According to the method, the activation pretreatment is combined with multi-stage purification, so that the purity and the synthesis efficiency of tungsten hexafluoride are remarkably improved.

The invention relates to the technical field of preparation of nano aluminum oxide functional materials, in particular to a method for preparing nano aluminum oxide based on gradient centrifugation and a supercritical technology. The method comprises the following steps: carrying out dispersion treatment on a hydrophilic solvent, an aluminum oxide raw material and a dispersing agent to obtain initial slurry; under the condition of constant temperature, the initial slurry is subjected to graded grinding, and refined slurry is obtained; the graded grinding sequentially comprises first-stage grinding, second-stage grinding and third-stage grinding; carrying out gradient centrifugation on the refined slurry to obtain concentrated slurry; the gradient centrifugation sequentially comprises first-stage centrifugation, second-stage centrifugation and third-stage centrifugation; carrying out supercritical drying on the concentrated slurry by using carbon dioxide and a silane coupling agent to obtain coarse alumina powder; and drying the coarse alumina powder in vacuum to obtain the nano alumina. According to the method, through multi-unit collaborative integration of graded grinding, gradient centrifugation and supercritical drying, the production target of high-purity, narrow-particle-size-distribution and low-agglomeration-rate nanometer aluminum oxide is achieved, and the use performance of the nanometer aluminum oxide product is remarkably improved.

Disclosed herein is a metal oxide aerogel catalyst for hydrogenation and / or hydrodeoxygenation, a method for preparing the same, and a method for hydrogenation and / or hydrodeoxygenation using the same. The catalyst consists of a metal and an oxide thereof, and the catalyst is in a form of an aerogel produced by supercritical drying. The catalyst has an effect of providing high hydrogenation and / or hydrodeoxygenation efficiency of an oxygen-containing compound.

The invention relates to a method for preparing high-purity porous silicon carbide ceramic from a biomass aerogel precursor. The method comprises the following specific steps: (1) preparing precursor sol; (2) gelatinizing, aging and forming a three-dimensional network structure; (3) solvent replacement; (4) performing supercritical drying to obtain biomass carbon-silicon dioxide composite aerogel; (5) carrying out carbon thermal reduction reaction to generate porous silicon carbide ceramic; and (6) decarbonizing and purifying to obtain the high-purity porous silicon carbide ceramic. The prepared porous silicon carbide ceramic material has high specific surface area, uniform pore size distribution and good mechanical strength, can effectively filter impurities such as particulate matters and harmful gases in gas, and shows excellent gas filtering performance. The material can be used in the fields of air purification, industrial waste gas treatment and the like, and has a wide application prospect.

The invention provides a double-layer polyimide composite aerogel and a preparation method and application thereof, and the preparation method comprises the following steps: (1) carrying out stepwise polymerization reaction on a flexible diamine monomer, a rigid diamine monomer and a high-surface-energy rigid dianhydride monomer in a polar aprotic solvent to obtain a first polyamide acid solution; (2) sequentially carrying out polymerization reaction on a flexible diamine monomer, a fluorine-containing dianhydride monomer and a high-surface-energy rigid dianhydride monomer in a polar aprotic solvent to obtain a second polyamide acid solution; (3) uniformly mixing the first polyamic acid solution and the second polyamic acid solution with a polysiloxane solution, a dehydrating agent and a first catalyst respectively for reaction to obtain first composite sol and second composite sol respectively; and (4) sequentially pouring the first composite sol and the second composite sol into a mold, and sequentially carrying out standing, aging, solvent replacement and supercritical drying to obtain the double-layer polyimide composite aerogel. The prepared double-layer polyimide composite aerogel has the advantages of being excellent in heat insulation performance, high in cooling medium transmission rate and the like.

The application discloses a preparation method of aerogel particles for thermal insulation materials, comprising the following steps: mixing raw materials: uniformly mixing a silicon source, a modifier, an alcohol reagent and water to form a mixed solution A; adding a catalyst: adding the catalyst into the mixed solution A to form a mixed solution B; gelation: performing gelation on the mixed solution B; the gelation temperature is 20-35 DEG C, and the gelation humidity is 30%-60% RH; granulation: when the gel hardness value is 20-70 F, performing the granulation; aging: adding the granulated gel particles into an alcohol aging solution for aging; drying: performing supercritical drying on the aged gel particles to form the aerogel particles. The application monitors the granulation hardness to determine the granulation time, and the gel is not excessively pulverized or insufficiently pulverized in the granulation process under the suitable hardness; meanwhile, the gel temperature and humidity are regulated to make the gel maintain suitable elasticity, which is more favorable for obtaining more uniform aerogel particles and improving the yield of the 1-4 mm particle size particles.

The invention discloses a flame-retardant modified phenolic aerogel composite material and a preparation method thereof, and the method comprises the following steps: mixing phenolic resin, an alcohol pore-forming agent, a flame retardant containing phosphorus and nitrogen elements, a curing agent and a surface modifier according to a specific mass ratio to prepare a precursor solution; and dipping a fiber fabric in the solution, and sequentially carrying out curing, flame-retardant modified solvent replacement, normal-pressure drying and vacuum drying to obtain the composite material. The flame-retardant modified solvent is replaced by a boric acid solution or an ammonium borate solution. Through an innovative step-by-step flame-retardant strategy, the phosphorus-nitrogen flame retardant is fixed on a gel network, and a flame-retardant layer is introduced on the pore surface through replacement of a boron-containing solution, so that synergistic interaction of a flame-retardant function is realized. According to the method, the limit oxygen index and the thermal stability of the material are remarkably improved, meanwhile, the low-density and low-thermal-conductivity nano-porous structure of the material is well maintained, expensive supercritical drying is successfully replaced with normal-pressure drying, and the production cost is greatly reduced.

The application discloses a drying method of hibiscus flowers. The method comprises the following steps: 1) enzyme inactivation and color protection: the hibiscus flowers are sequentially immersed in an acidic citric acid-vitamin C solution and a solution added with corn stem and leaf water extract, so as to efficiently inactivate oxidase and protect color; 2) composite film construction: a hibiscus leaf extract solution is used as a natural film-forming matrix, is compounded with hydroxypropyl methyl cellulose and the like to form a film-forming solution, the hibiscus flowers are immersed and coated, and a supercritical CO2 drying technology is used to form a uniform and porous protective film on the petal surface; and 3) hot air drying: two-stage gradient temperature and humidity control is adopted for final drying. The application can significantly inhibit enzyme browning and non-enzyme browning in the drying process, effectively reduce the loss of functional components such as anthocyanins and flavonoids, solve the problems of petal blackening, brittleness, fragility and the like caused by traditional drying, and the finished product is full in shape, bright in color, and green in the whole process.

The invention relates to a method and a facility for continuously manufacturing granular aerogel and a supercritical CO2 drying method. The present invention provides a process for the continuous production of a particulate aerogel from a precursor, comprising the steps of:-mixing the precursor with a synthesis solvent and a hydrolysis reagent and, if appropriate, a catalyst to obtain a gel,-granulating the resulting product to produce particulates,-maintaining the particulates in contact with the synthesis solvent and the hydrolysis reagent, -washing the granulate by adding a washing solvent in order to extract, in particular, the hydrolytic agent, if appropriate, the catalyst,-drying the granulate by sending an excess of supercritical CO2 to the granulate in order to extract the synthesis solvent and / or the washing solvent, said steps of granulating, holding, washing and drying being carried out at a pressure higher than the critical point of CO2, and maintaining these conditions between these steps. The invention also provides a facility specially designed to implement the method of the invention, as well as a supercritical CO2 drying method.

The invention relates to aramid nanofiber reinforced silicon dioxide composite aerogel and a preparation method thereof. The method comprises the following steps: preparing aramid nano-fibers into dispersion liquid by adopting a mixed solution containing dimethyl sulfoxide and isopropanol; adding basalt nanosheets and methyltrimethoxysilane into the dispersion liquid, and uniformly mixing the basalt nanosheets and the methyltrimethoxysilane to obtain mixed sol; putting the mixed sol into a mold, sealing the mold by adopting a polytetrafluoroethylene film with micropores, then putting the mold into a low-concentration acetic acid aqueous solution for gelling, aging at room temperature, and then putting the mold into a high-concentration acetic acid aqueous solution for high-temperature aging to obtain high-temperature aged gel; the high-temperature aging gel is sequentially subjected to solvent replacement and supercritical drying, and the aramid nanofiber reinforced silicon dioxide composite aerogel is prepared. According to the preparation method, the composite aerogel assembled by aramid nanofibers, basalt nanosheets and silicon dioxide nanoparticles is prepared, and synergistic improvement of mechanical and thermal properties of the composite aerogel material is finally realized through pore size regulation and control and a multi-dimensional assembly strategy.

The invention belongs to the technical field of aerogel preparation, and relates to a method for preparing ultrathin aerogel by supercritical drying of carbon dioxide, which comprises the following steps: preparing a basic catalytic liquid, preparing silica sol, forming and aging ultrathin wet gel, performing surface modification, pretreating a drying system, performing limited loading and sealing, performing flexible gradient replacement and drying, and performing gradient depressurization and material taking. According to the method, limited loading is carried out by introducing a breathable constraint clamp, and a segmented gradient pressure increasing and decreasing carbon dioxide supercritical drying process introduced at an initial low speed is matched, so that macroscopic curling deformation caused by internal stress release of the ultrathin sample is forcibly eliminated; the mechanical damage of turbulent shearing to a fragile film skeleton is effectively avoided by utilizing fine fluid control of slow starting and quick rising, and meanwhile, the preparation period is remarkably shortened by utilizing the quick mass transfer characteristic of an ultrathin sample; the prepared aerogel film is high in flatness, free of macroscopic curl, complete in structure and free of cracks, and is suitable for the fields of flexible heat insulation and precision optics.

The invention belongs to the field of aerogel composite materials, and particularly provides a polyacrylonitrile (PAN) and biomass-based carbon aerogel compounded light-weight high-strength thermal insulation material and a preparation method thereof. The material combines the low heat conduction characteristic of the biomass carbon aerogel and the reinforced mechanical property of the polyacrylonitrile fiber, the binding force of the fiber and the carbon aerogel is strong, the structure is stable, and the heat insulation performance is excellent. The PAN-based fibers and the carbon aerogel are carbonized synchronously, so that the technological process is simplified; a non-supercritical drying method is selected for drying, the technological process is simple, the energy consumption is low, and the cost is low; the composite carbon source CVD method realizes low-temperature, efficient and uniform deposition growth of porous carbon, enhances the interface bonding force and isolates a heat transfer path; the prepared biomass-based carbon aerogel-polyacrylonitrile fiber composite thermal insulation material has the advantages of low density, high specific surface area, low thermal conductivity and excellent mechanical property and thermal insulation property.

The invention provides Sc2O3 porous aerogel as well as a preparation method and application thereof. According to the method, ScCl3. 6H2O is selected as a scandium source and is non-toxic, and the reaction activity of the ScCl3. 6H2O is controllable compared with that of organic metal alkoxide. In addition, compared with supercritical drying and freeze drying, the normal-pressure drying method for graded drying is lower in cost and higher in safety, and graded drying can effectively protect the nano structure and reduce cracking and collapse of the sample as much as possible. In addition, the scandium oxide aerogel is synthesized for the first time, and the product is high in porosity, large in specific surface area and good in heat insulation performance and has positive significance in application of aerogel materials in various fields.

The embodiments described herein generally relate to processing chambers incorporating a small thermal mass, which enable efficient temperature cycling for supercritical drying processes. The chambers generally include a body, a liner, and an isolation element that enables the liner to exhibit a small thermal mass relative to the body. The chambers are also configured with suitable equipment for generating and / or maintaining a supercritical fluid within a processing volume of the chamber.

The invention provides a preparation method of high-performance silicon fluoride aerogel, and relates to the field of aerogel preparation, and the preparation method comprises the following steps: S1, preparing sol: preparing a component A and preparing a component B; the component A is prepared by fully mixing a fluorine-free silicon source, a pre-hydrolyzed fluorine-containing organic silicon source, absolute ethyl alcohol and deionized water, then adding an acid catalyst, adjusting the pH value of the solution to 2.5-4.0, adding a regulator and carrying out constant-temperature hydrolysis; the component B is prepared by uniformly mixing deionized water with an ammonia source to obtain a basic catalyst solution; step S2, gelling; step S3, aging; and S4, performing supercritical drying. According to the method, silicate ester with a fluorocarbon bond is introduced as a carbon source, so that the water resistance of the silicon dioxide aerogel is effectively improved, corrosion of acid-base particles is hindered, and the heat conductivity coefficient of the aerogel is remarkably reduced.

The present application relates to a kind of metal oxide hollow nanotube array material and its preparation method and application, belong to nanometer material technical field.The preparation method of the present application includes the following steps: S1, the substrate loaded with columnar micellar seed is soaked in solvent A, under oscillation condition, drop the solution of block copolymer, through stationary aging, elution and drying, obtain block copolymer nanobrush;S2, the block copolymer nanobrush of S1 is soaked in metal salt solution, after washing, again be soaked in solvent B by supercritical drying, obtain metal salt nanotube array material;S3, the metal salt nanotube array material of S2 is calcined, obtain the metal oxide hollow nanotube array material.The preparation method of the present application proposes the template guiding effect of block copolymer nanobrush, so that it can guide multifunctional metal oxide nanotube array, and on this basis, the adjustment of nanotube of different height is realized.

The present application belongs to the field of biomedical materials and tissue engineering, and particularly relates to a kind of acellular matrix aerogel repair material and its preparation method and application.Further, the present application relates to the comprehensive preparation method of the material, especially the extremely low immunogenicity acellular process combined with physical, chemical and supercritical fluid technologies, and the unique aerogel forming technology based on supercritical drying.Further, the present application relates to the application of the material, mainly related to soft tissue repair, medical cosmetology, bone / cartilage injury repair field.