297results about "Aerogel preparation" patented technology

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 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.

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.

The invention discloses a graphene oxide-chitosan-carboxymethyl cellulose composite aerogel and an application of the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel in adsorption of amaranth. The preparation method comprises the following steps: mixing a carboxymethyl cellulose aqueous solution with a chitosan acetic acid solution, adding gallic acid, stirring until the gallic acid is completely dissolved, adding the graphene oxide dispersion liquid, and stirring until a system forms uniform and stable gel; the gel is firstly subjected to ultralow-temperature freezing and then subjected to freeze drying, and finally the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel is obtained. The aerogel prepared by the method is environment-friendly and stable in pore structure, and is a composite aerogel material with high adsorption capacity and good regeneration performance on anionic dyes. The adsorption capacity of the aerogel to amaranth can reach 125 mg / g, the adsorption rate is still kept at 77% after the aerogel is recycled for 3 times, and the aerogel is suitable for efficient treatment of dye wastewater.

The invention provides an aluminum oxide aerogel composite material as well as a preparation method and application thereof, and belongs to the technical field of aluminum oxide aerogel preparation. The preparation method provided by the invention comprises the following steps: (1) preparing aluminum sol by taking coal gangue as an aluminum source; (2) mixing the aluminum sol obtained in the step (1) with aluminum silicate fibers, and performing gelation to obtain composite hydrogel; and (3) mixing the composite hydrogel obtained in the step (2) with ethanol, aging, mixing with a modifier, modifying, and carrying out graded normal-pressure drying to obtain the aluminum oxide aerogel composite material, the modifier in the step (3) is one or more of absolute ethyl alcohol, tetraethoxysilane and normal hexane. The alumina aerogel composite material prepared by the preparation method provided by the invention has the characteristics of low density, low heat conductivity coefficient and high strength, and is suitable for the high-temperature processing field of special materials and the aerospace field.

A natural aldehyde-functionalized all-biomass aerogel and a preparation method thereof, the method comprises: (1) dispersing chitosan in a starch-like fiber solution and stirring to obtain a uniform mixed solution; (2) adding genipin as a crosslinking agent to the mixed solution obtained in step (1), heating and stirring for a period of time to obtain an aerogel precursor solution, and allowing the same to stand to undergo crosslinking to obtain a hydrogel; (3) freezing the hydrogel obtained in step (2), and then freeze-drying to obtain an aerogel; (4) soaking the aerogel obtained in step (3) in a natural aldehyde solution for graft modification, then removing and rinsing, and subsequently drying to obtain the aldehyde-functionalized aerogel.

The application discloses a kind of metal-loaded starch aerogel and its preparation method and application, comprising the following steps: (1) starch and water are prepared into starch milk, starch milk is heated, and gelatinized starch solution is obtained;(2) sodium laurate is added to the gelatinized starch solution and heated to react, and after the reaction is completed, starch-sodium laurate complex solution is obtained;(3) metal nitrate solution is added to the above-mentioned complex solution, and after stirring uniformly, a reducing agent is added to reduce metal ions, and metal-loaded starch hydrogel is obtained;(4) the above-mentioned hydrogel is pre-frozen and freeze-dried to obtain metal-loaded starch aerogel.The metal-loaded starch aerogel of the application has excellent ethylene adsorption capacity, with an adsorption capacity of about 32 mL / g, good adsorption stability, and the adsorption process can be carried out at normal temperature and pressure, which can be used for fruit preservation.

The present invention provides a modified silica aerogel powder having a higher water repellency and a larger contact angle, and a method for producing the same. At the same time, the present invention provides an aerogel slurry having a lower thermal conductivity and a method for producing the same. The present invention also provides a method for producing an aerogel insulating felt having low thermal conductivity, high mechanical strength, and capable of relatively well resolving the problem of powder shedding. The method for producing the modified silica aerogel powder includes the steps of (1) modifying halloysite nanotubes with dodecyl methacrylate and pentafluorophenyl methacrylate, (2) preparing a silica sol, (3) adding the modified halloysite nanotubes to the silica sol to prepare a wet gel, and (5) preparing the wet gel into the modified silica aerogel powder. The present application also provides a method for producing an aerogel slurry from the modified silica aerogel powder, and a method for producing an aerogel insulating felt from the aerogel slurry.

The invention discloses preparation of a CS / BC / MBene composite aerogel material and application of the CS / BC / MBene composite aerogel material in photo-thermal water evaporation. A MoAlB precursor is etched through a fluoride-free hydrothermal method to prepare MoBTxMBene nanosheets, then the MoBTxMBene nanosheets, chitosan (CS) and bacterial cellulose (BC) are assembled through interaction of hydrogen bonds and the like, and the CS / BC / MBene composite aerogel with vertical pore channels is obtained through directional freeze drying. The aerogel has excellent photothermal conversion performance, mechanical strength and hydrophilicity, the maximum surface temperature of the composite aerogel under irradiation of one sunlight reaches 112.3 DEG C, the water evaporation rate of 5.06 kg.m <-2 >. H <-1 > and the photothermal conversion efficiency of 99.76% can be achieved, the composite aerogel is suitable for seawater desalination and sewage purification, the preparation method is environmentally friendly and simple, and the preparation method is suitable for industrial production. And the method has a wide industrial application prospect.

The application belongs to the field of new material preparation, and particularly relates to a preparation method of amino-modified biochar / SiO2 composite aerogel. The application prepares cellulose / SiO2 composite aerogel by taking cellulose as a template and tetraethyl orthosilicate as a silicon source, obtains biochar / SiO2 composite aerogel after high-temperature calcination, and then carries out amino modification on the biochar / SiO2 composite aerogel by using a polymer obtained by cross-linking reaction of 3-glycidoxypropyltrimethoxysilane and diethylenetriamine, to obtain amino-modified biochar / SiO2 composite aerogel. The amino-modified biochar / SiO2 composite aerogel prepared by the application has high selectivity for CO2 adsorption, and the preparation process is simple.

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 application belongs to the technical field of microwave absorbing materials, and relates to Fe3O4@C magnetic modification MXene-based aerogel microwave absorbing material and a preparation method thereof. The microwave absorbing material has a porous structure, and the inner wall is attached with magnetic double-layer structure Fe3O4@C particles. The outer shell is spindle-shaped amorphous carbon, and the inner core is Fe3O4 magnetic particles. The preparation method comprises the following steps: preparation of nano spindle-shaped Fe2O3 precursor, preparation of magnetic double-layer structure Fe3O4@C particles, preparation of single-layer MXene nanosheet, and preparation of Fe3O4@C magnetic modification MXene-based aerogel. The Fe2O3 precursor is generated by using a hydrothermal method. The Fe2O3 precursor can not only be used as a template of a polydopamine shell, but also can be partially reduced to generate magnetic Fe3O4, so that the wave absorbing performance is enhanced. The polydopamine shell is carbonized at high temperature, and the internal Fe2O3 precursor is reduced to Fe3O4. The magnetic particles are positively charged and naturally adsorbed with the single-layer MXene nanosheet by using polydiallyldimethylammonium chloride treatment. Gelatin is used as a cementing agent in the application, so that the strength of the aerogel is ensured while the economy is ensured.

The present invention relates to methods of preparing aerogel and aerogel slurries, as well as to aerogels and slurries prepared thereby. More particularly, the invention relates to environmentally-friendly methods of preparing aerogels and aerogel slurries in which carbon dioxide is utilised as a reactant and is consumed during the process.

The invention relates to the technical field of functional nano material preparation, in particular to a preparation method of aluminum-based MOF (Metal Organic Framework) nanofiber aerogel. According to the specific technical scheme, the preparation method comprises the following steps: S1, calcining prepared precursor nanofiber membranes with different diameters to obtain amorphous silica-alumina precursor nanofiber membranes, and putting the membranes into a reaction solution A for synthesis to obtain aluminum-based MOF nanofiber membranes X, Y and Z with different diameters; s2, respectively crushing aluminum-based MOF nanofiber membranes with different diameters, respectively putting the crushed aluminum-based MOF nanofiber membranes into the reaction solution B for reaction, and after the reaction is finished, carrying out ultrasonic homogeneous dispersion to obtain homogeneous dispersion liquids X1, Y1 and Z1; s3, the homogeneous dispersion liquid X1, the homogeneous dispersion liquid Y1 and the homogeneous dispersion liquid Z1 are frozen and crushed, then a template is filled with the homogeneous dispersion liquid X1, the homogeneous dispersion liquid Y1 and the homogeneous dispersion liquid Z1, solidified blocks are obtained, then drying treatment is conducted, the solidified blocks are put into a reaction solution C to be activated, and then the aluminum-based MOF nanofiber aerogel is obtained, so that special-effect utilization of the aluminum-based MOF nanofiber aerogel in the fields of chemical protection, toxic and harmful gas treatment and the like is achieved.

The invention discloses a magnetic nanoparticle-carbon nanotube in-situ composite material as well as a preparation method and application thereof. The composite material comprises a carbon nano tube and magnetic nano particles, the carbon nanotubes are combined with the magnetic metal particles, and the magnetic nanoparticles are distributed among the carbon nanotubes and are distributed near the magnetic metal particles in a concentrated manner. The aerogel formed by floating vapor deposition is in contact with the dispersion liquid with the magnetic nanoparticles, so that the magnetic nanoparticles are guided among the carbon nanotubes, electromagnetic shielding is realized, and in the process, a catalytic source containing magnetic metal elements is adopted, so that magnetic metal particles are constructed in the structure of the carbon nanotubes, and the electromagnetic shielding effect is improved. The metal particles are naturally dispersed and distributed in the carbon nano tube network, so that the magnetic nano particles can be guided to aggregate towards the dispersed metal particles respectively, and uneven distribution and mechanical weakness caused by aggregation of a large number of magnetic nano particles in the space are avoided.

The application relates to the technical field of supercapacitor electrode material preparation, and particularly discloses a nitrogen and phosphorus co-doped carbon aerogel material and a preparation method thereof. Nanocellulose is prepared by taking bleached coniferous wood pulp as a base, inorganic or organic matter containing N and P double elements is used as a dopant, and the N and P double-doped porous three-dimensional network carbon aerogel with excellent performance and stable structure is prepared through one-step doping by ultrasonic mixing, freeze drying and high-temperature carbonization. Compared with the prior art, the raw materials selected by the application have a wide source and low price, the carbon aerogel prepared by the application has good mesoporous structure, uniform distribution of nitrogen and phosphorus, and excellent electrochemical performance, and the application provides an effective way for developing supercapacitors with low price, sustainable utilization, good flexibility, excellent electrochemical performance and good cycle stability.

The invention discloses fibrous ettringite, a light cement aerogel material for a pipeline lining based on the fibrous ettringite and a preparation method of the light cement aerogel material. The light cement aerogel material for the pipeline lining is prepared from a solution obtained by mixing and stirring fibrous ettringite, cement, an adhesive, a dispersing agent, a hydrophobic component, a foaming component and water through a directional freezing technology, wherein the fibrous ettringite is prepared by heating and stirring a calcium nitrate solution, an aluminum sulfate solution and a sodium hydroxide solution. According to the invention, ettringite which can be uniformly dispersed is synthesized by a ligand-free thermal injection method, and the ettringite, cement and an adhesive raw material are subjected to freezing pore-forming by adopting a directional freezing technology, so that the aerogel material with a special organic-inorganic framework directional ordered pore structure has the characteristics of light weight, high strength, flame retardance and the like; and the overall performance of the pipeline lining material can be improved.

This invention relates to a composite aerogel material, its preparation method, and its applications. The invention selects cobalt and carbon as components of the microwave absorber, utilizing the synergistic effect between the different components to maintain a wide effective absorption bandwidth while exhibiting strong electromagnetic wave attenuation. Chitosan aerogel is prepared using directional cryogenic casting, followed by a high-temperature carbonization reaction in a tube furnace to obtain an aerogel loaded with cobalt particles. The process of this invention is simple and easy to implement; the composite aerogel microwave absorber can be prepared through directional cryogenic casting and a one-step carbonization process.

The invention provides a preparation method and application of macrocyclic multi-amino porous organic aerogel, and belongs to the field of catalysts. The preparation method comprises the following steps: reacting tetraazacyclododecane with chloromethyl styrene to obtain an intermediate; and carrying out sol-gel polymerization on the intermediate, and drying to obtain the macrocyclic multi-amino porous organic aerogel. As a thermal insulation material and a heterogeneous catalyst, the macrocyclic multi-amino porous organic aerogel can be applied to thermal insulation and cycloaddition reaction of a halogenated epoxy substrate and carbon dioxide, and has the characteristics of high conversion rate and high selectivity.

The invention discloses a preparation method of a calcium carbonate-polyvinyl alcohol composite aerogel material, and belongs to the technical field of thermal insulation materials. The invention aims to solve the problems that the crystallization behavior of calcium carbonate is difficult to effectively regulate and control and the porous structure and the heat insulation function of aerogel are easily damaged in the prior art. The method comprises the following steps: reacting a mixed solution of calcium chloride and magnesium chloride with carbon dioxide to prepare micro-nano amorphous calcium carbonate and a small amount of nano calcite; co-doping the chitosan and aspartic acid into polyvinyl alcohol hydrogel, uniformly mixing, and carrying out directional freezing and freeze-drying treatment; finally, high-concentration carbon dioxide atmosphere treatment is adopted in a humid and hot environment, amorphous calcium carbonate is induced to be dissolved on the polyvinyl alcohol framework and recrystallized into calcite and vaterite shell layers, and therefore the composite aerogel material is obtained. While good heat insulation performance and flexibility are maintained, the mechanical strength and damp and heat resistance stability of the material are remarkably improved, efficient curing and utilization of carbon dioxide are achieved, and the material is suitable for the field of green energy-saving buildings.

The invention discloses a preparation method of multifunctional carbon nitride / carbon composite aerogel and application of the multifunctional carbon nitride / carbon composite aerogel in oil-water separation in multiple extreme scenes, and relates to the technical field of aerogel functional materials. The preparation method of the composite aerogel comprises the following steps: (1) completely immersing bacterial cellulose gel into deionized water, removing residual impurities, and cutting the bacterial cellulose gel into regular blocks; and (2) soaking the bacterial cellulose block in the step (1) in a precursor solution of carbon nitride to obtain bacterial cellulose / precursor composite hydrogel, and performing directional freezing and freeze drying to obtain the bacterial cellulose / precursor composite aerogel. And (3) calcining the aerogel obtained in the step (2) to finally obtain the carbon nitride / carbon composite aerogel. The multifunctional carbon nitride / carbon composite aerogel prepared by the preparation method disclosed by the invention has the capabilities of resisting oil-water separation in various extremely severe environments, such as flame retardance, high and low temperature resistance, fatigue resistance and bacterium resistance, and provides possibility for application in more oil-water separation scenes in the future.

The application discloses a carbon aerogel with ZIF-8 as a skeleton and a preparation method and application thereof, and comprises the following steps: carrying out heating and stirring reaction on ZIF-8 and a polymer hydrogel, drying, and carbonizing, so as to obtain the carbon aerogel with ZIF-8 as the skeleton; wherein the ZIF-8 is carboxyl-modified ZIF-8; the preparation of the carboxyl-modified ZIF-8 comprises the following steps: reacting 2-methyl imidazole-4, 5-dicarboxylic acid with a cationic surfactant and a zinc salt under a pressurized condition. The carboxyl-modified ZIF-8 is compounded with a polymer containing an oxygen-containing hydrophilic functional group; in the compounding process, high temperature makes the -COOH and the oxygen-containing functional group better combined, and crosslinking action also exists between the polymers.

The invention discloses a preparation method of metal aerogel based on an effervescent auxiliary technology, which comprises the following steps: S1, preparing an acid-base effervescent tablet: weighing an acid source and an alkali source, and pressing into the effervescent tablet; s2, preparing a precursor solution: sequentially adding a metal salt precursor, a ligand and a reducing agent into a solvent, and uniformly mixing to obtain the precursor solution; s3, an effervescent initiation reaction is conducted, specifically, the effervescent tablets are added into the precursor solution, after the effervescent tablets are disintegrated, standing is conducted for 1-3 hours at the room temperature, and metal wet gel is obtained; and S4, cleaning and drying: cleaning the metal wet gel for multiple times by using a solvent to remove salt attached to the surface, then carrying out solvent exchange by using tert-butyl alcohol, carrying out liquid nitrogen freezing, and carrying out freeze drying to obtain the metal aerogel material. According to the method, an effervescent auxiliary technology is used, the gel process is accelerated through generated carbon dioxide gas, the use cost of a reducing agent and an initiator is reduced, and the controllability and greenness of the preparation process are improved.

The present invention relates to an aerogel blanket including aerogel with a low content of organic matters, and a method for preparing the aerogel blanket.

An aerogel composite which maintains a high degree of hydrophobicity, and also an excellent level of heat insulation properties even when exposed to a high-temperature environment.

This invention relates to the field of nanocomposite materials technology, specifically to a carbon-based silver sulfide composite aerogel with synergistically enhanced light-harvesting and biofouling resistance, its preparation method, and its applications. The method involves pouring a chitosan-graphene solution into a polystyrene mold and using different cryogenic casting methods to obtain chitosan-graphene aerogels with different orientations. Carbonization under a N2 atmosphere yields carbon-based aerogels with different structures. Immersion in a tannic acid-Tris solution allows for the adsorption of tannic acid molecules. After washing with deionized water, the aerogels are immersed in a silver nitrate solution to form tannic acid-silver ion complexes. Further washing with deionized water and immersion in a thioacetamide solution yields carbon-based silver sulfide composite aerogels with different structures. This method solves the problem of performance loss due to biofouling in carbon-based three-dimensional porous materials. The carbon-based silver sulfide aerogel exhibits superior light absorption and photothermal properties compared to carbon-based zinc oxide aerogels, overcoming the problem of weakened evaporation performance in conventional anti-biofouling designs.

Compositions are disclosed herein comprising an aerogel or a hydrogel. The aerogel or hydrogel comprises water-insoluble alpha-glucan and metal oxide. At least about 50% of the glycosidic linkages of the water-insoluble alpha-glucan are alpha-1,3 linkages, and the metal oxide is selected from calcium oxide, magnesium oxide, titanium dioxide, or any other suitable metal oxide. Methods of producing aerogels and hydrogels are also disclosed, as well as methods of using these materials, such as in absorption techniques. Other types of materials containing water-insoluble alpha-glucan are also disclosed.

The invention relates to the technical field of fiber materials, in particular to a modified heat-resistant fiber and a preparation method and application thereof. The invention provides a modified heat-resistant fiber. The modified heat-resistant fiber comprises a heat-resistant fiber and whiskers coating the surface of the heat-resistant fiber, the crystal whiskers comprise aluminum metaborate crystal whiskers and / or aluminum borate crystal whiskers. According to the invention, the surface of the heat-resistant fiber is coated with the whisker, and the whisker structure increases the physical embedding of the heat-resistant fiber and the aerogel matrix, so that the interface bonding strength of the heat-resistant fiber and the aerogel matrix is improved; in addition, the introduction of boron endows the heat-resistant fiber with certain anti-radiation performance, and the functional application potential of the heat-resistant fiber is expanded.

The application discloses an environment-friendly aerogel, a preparation process and application thereof, and has the advantages that the preparation process route is simple, waste paper can be recycled and utilized, and the aerogel which can be used as an air particulate matter adsorption material is generated, meanwhile, in the process route, an ultrasonic device is added to disperse and utilize cavitation effect, so that the porosity and compactness of the aerogel material can be effectively increased, the aerogel prepared by the process has excellent particulate matter adsorption effect, and after carbonization, carbonized aerogel with good mechanical properties can be obtained, has good lipophilic and hydrophobic effects, and can be used for treating oil stains in a water environment.