77results about How to "Uniform porous structure" patented technology

The invention discloses straw fiber reinforced foam concrete and a preparation method thereof, and belongs to the technical field of building materials. The straw fiber reinforced foam concrete comprises the following components by mass: 40-80 parts of a cementitious material; 1-20 parts of a fine lightweight aggregate; 0.05-0.6 part of straw fiber; 2-8 parts of a chemical foaming agent; 0.5-4 parts of a physical foaming agent; 0.02-0.14 part of a foam stabilizing agent; 0.1-0.8 part of a catalyst; 0.05-0.6 part of a thickening agent and 15-30 parts of water. The preparation method is as follows: mixing and stirring the cementitious material, the straw fiber and the thickening agent, then adding the water, the chemical foaming agent, the foam stabilizing agent and the catalyst, stirring to obtain a slurry mixture, then adding expanded vermiculite, stirring to obtain chemically foamed foam concrete; adding the physical foaming agent into the chemically foamed foam concrete, stirring, pouring into a mould, and demoulding after concrete is solidified and hardened to prepare the straw fiber reinforced foam concrete. The straw fiber reinforced foam concrete has a more uniform multihole structure, and the water proof, sound insulation and heat insulation effects are better than that of foam concrete in the prior art.

The invention discloses a porous membrane and a pore-forming method of the porous membrane. According to a preparation method, a foaming pore-forming agent is introduced into a membrane-forming system and can generate uniformly distributed trace air bubbles through reaction so as to form a porous structure; therefore, the porosity of the membrane is improved, and macropore defects of the membrane can be avoided. The pore-forming method is applicable to membrane preparation by a solution method and a melting method. The pore-forming method specifically comprises the steps of (1) membrane preparation by the solution method: uniformly mixing a membrane-forming polymer and the foaming pore-forming agent, dissolving the mixture in a solvent to obtain a membrane casting solution containing the foaming pore-forming agent, wherein the membrane casting liquid enters an acidic coagulating bath after being subjected to scraping or is spun through a hollow fiber spinning head, so that the membrane casting liquid is solidified and formed to obtain the porous membrane when the foaming pore-forming agent reacts to form the air bubbles; (2) membrane preparation by the melting method: uniformly mixing the membrane-forming polymer and the foaming pore-forming agent, and obtaining an initial hollow fiber containing the foaming pore-forming agent through conventional hollow fiber membrane melting spinning, and putting the obtained initial hollow fiber into the acidic coagulating bath, wherein the hollow fiber is solidified and formed to obtain the porous membrane when the foaming pore-forming agent reacts to form the air bubbles.

The invention relates to a method for preparing a nano porous copper thin film material by magnetron sputtering. The method takes a commercial copper foil as a base body material and takes high-purity copper target and aluminum target as sputtering materials; magnetron sputtering equipment is a preparation tool; a nano porous copper thin film is obtained by sputtering a copper-aluminum thin film through a glow discharge principle, and dealloying and corroding to remove an active component aluminum after annealing and alloying. The method provided by the invention is a two-step reaction method, the problems in the prior art that steps for carrying out smelting, ball milling and melt spinning on alloy auxiliary materials are complicated and consumed time is long are solved, and steps of a preparation process are simplified; a nano porous structure of nano porous copper is obtained and the size of the thin film is controllable; the obtained structure is better than a nano porous copper powder sample obtained by a traditional method; furthermore, an application range of the nano porous copper is enlarged and the nano porous copper has a commercial prospect.

The invention discloses a method of preparing a magnesium-doped hydroxyapatite/titania active film on the surface of medical titanium alloy. According to the invention, the technology of microarc oxidation is used for synthesis of the magnesium-doped hydroxyapatite/titania active film on the surface of titanium alloy in phosphate electrolyte containing magnesium ions and calcium ions. The film prepared by using the preparation method provided by the invention has a porous structure, high binding strength with a titanium alloy substrate and good biological activity and cellular affinity.

The present invention provides a separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed at one or both sides of the porous substrate, contains (1) polyvinylidene fluoride resin A and (2) polyvinylidene fluoride resin B described below, and has a porosity of from 30% to 60% and an average pore size of from 20 nm to 100 nm:

• • (1) polyvinylidene fluoride resin A is selected from the group consisting of vinylidene fluoride homopolymers and DVF copolymers containing structural units derived from vinylidene fluoride (VDF) and structural units derived from hexafluoropropylene (HFP), a total content of structural unit derived from HFP in each of the VDF copolymers being 1.5 mol % or less of a total content of structural unit in each of the VDF copolymers; and
  • (2) polyvinylidene fluoride resin B selected from the group consisting of VDF copolymers containing a structural unit derived from VDF and a structural unit derived from hexafluoropropylene, a total content of structural unit derived from HFP in each of the VDF copolymers being greater than 1.5 mol % of a total content of structural unit in each of the VDF copolymers

The invention provides a porous electrode for a flow battery and a preparation method of the porous electrode, and relates to the field of flow batteries. The preparation method comprises the following steps: S1, adding polyacrylonitrile and a metal salt into N, N-dimethylformamide or N, N-dimethylacetamide, carrying out heating and mixing until polyacrylonitrile and the metal salt are dissolved,so as to obtain an electrospinning stock solution; S2, carrying out electrostatic spinning by using the electrospinning stock solution to obtain an electrospun fiber membrane; S3, dissolving an organic ligand in a solvent to obtain an organic ligand solution, soaking the electrospun fibrous membrane in the organic ligand solution for a period of time, and generating MOF particles in situ on the surface of the electrospun fibrous yarn; and S4, carrying out pre-oxidation on the fibers with the MOF particles deposited on the surfaces, and then carrying out carbonization in an inert gas atmosphereto obtain the porous electrode. The porous electrode prepared in the invention has a large specific surface area, is helpful for reducing the activation loss of the battery and improving the performance of the battery, and can be suitable for various flow batteries.

The invention relates to the fields of a microfluidic technology and an electrospinning technology, and provides a method for preparing a three-dimensional nanofiber stent with a micro-nanometer composite structure. By the microfluidic technology, monodisperse silk fibroin microspheres with a uniform dimension are prepared; growth factors are slowly and stably released along with the silk microsphere degradation, so that the biological effect is fully achieved; and the burst release problem and the peak valley phenomenon generated by nonuniform microspheres prepared through mechanical stirring, oscillation, ultrasonic homogenate and the like in the prior art are solved. In addition, double spray heads or a single spray head is used for performing electrostatic spinning on an ethanol solution of the silk fibroin microspheres containing growth factors and PEO (Polyethylene Oxide), and a hexafluoroisopropanol solution of silk fibroin; then, PEO fiber in the solution is dissolved; and themicro-nanometer composite three-dimensional nanofiber stent with the uniform porous structure and the proper porosity is prepared. The stent has good biocompatibility and certain mechanical performance; the inward growth of cells is facilitated; the increase and the migration of the cells are promoted; the double functions of improving the small-caliber artificial blood vessel forward patency rateand remodeling the blood vessel wall are realized; and the stent is applicable to the restoration or the replacement of injury or lesion small-caliber blood vessel tissues.

The invention discloses preparation and application of an Mxene-Mn3(PO4)2 composite electrode material. The preparation is characterized in that two-dimensional Ti3C2 nanosheets are synthesized from aTi3AlC2 ceramic material as a raw material, and ATP (adenosine triphosphate) is used as a template to induce synthesis of Mn3(PO4)2 nanoparticles. The Ti3C2/Mn3(PO4)2 nanocomposite synthesized with the method integrates good conductivity of Ti3C2 and biological mimetic enzyme activity of Mn3(PO4)2, and the composite material has excellent conductivity and catalytic performance by complementary advantages of the two raw materials, and is the excellent electrode material for preparing superoxide dismutase. The composite material can be used for constructing biosensors and has excellent application prospects in the fields of medical diagnosis, medical research and the like.

A synthetic leather is made by a impregnating a non-woven or woven textile with an aqueous polyurethane dispersion comprised of a nonionizable polyurethane and an external stabilizing surfactant. The impregnated textile is then exposed to water containing a coagulant for a coagulation time sufficient to coagulate the dispersion. The method may be used to form a synthetic leather having excellent wet ply adhesion and may contain an insoluble multivalent cation organic acid.

The invention discloses a positive electrode material with a uniform porous structure. The morphology of the positive electrode material is the uniform porous structure, the secondary particle D50 of the material is 2-15 [mu] m, and the porosity of the positive electrode material is 1.5-5%. The preparation method comprises the following steps: synthesizing a nickel-cobalt-manganese oxalate precursor with a compact structure by adopting a coprecipitation method, subjecting the oxalate precursor with the compact structure and a metal oxide doped with elements to mixing and presintering to obtain a doped nickel-cobalt-manganese oxide precursor with a uniform porous structure; and uniformly mixing the doped nickel-cobalt-manganese oxide precursor having the uniform porous structure with a lithium salt, carrying out primary sintering, carrying out mixing with a coating compound, and carrying out secondary sintering to finally obtain the doped and coated nickel-cobalt-lithium manganate positive electrode material with the uniform porous structure. The process of the method is simple, cost is relatively low, the performance of the material is obviously improved, and the prepared nickel-cobalt-lithium manganate positive electrode material with the uniform porous structure still has excellent rate capability and output power under the condition of low cobalt content.

The invention relates to a method for preparing super-clean high-purity acetic acid, and the high-purity acetic acid is mainly suitable for cleaning and corrosion in the manufacture industry of large scale integrated circuit semiconductor devices in the microelectronic industry. The method is as follows: firstly, the industrial grade acetic acid (99.0 percent) material is mixed with potassium permanganate with 0.1-0.5 percent of the weight of the acetic acid material in an oxidation processor; the mixture is filtered after 30-60 minutes under the normal temperature and pressure; the filtrate and a silicone polymer complexing agent of the bi-allyl 18-coronary-6 ether are mixed in a complexing processor for 30-120 minutes, and then the mixture is filtered by the microfiltration membrane of a microstrainer under the operation pressure of 0.1-0.2MPa; the filtrate passes through a 2,000mm dehydration column, and then enters a multi-level rectification tower with the speed of 0.05-0.20mm/s, and the semi-finished product yielded from the tower enters a product acceptor after the filtration by the nanofiltration membrane of a nanofiltration device under the operation pressure of 0.5-0.8MPa. The method has the advantages of simple process, low production cost, high product purity and low content of impurity ion. The device has the advantages of small occupied area, convenient automatic operation, stable quality and continuous production.

The invention discloses a composite modified aqueous acrylic resin emulsion coating-containing pearlescent flame retardation wallpaper. A resin adhesive adopted in a coating slurry used by the wallpaper is a cellulose acetate copolymer modified aqueous acrylic resin emulsion, the emulsion has stable performances and contains no formaldehyde or other chronic volatile toxic compounds, a coating formed by the emulsion is smooth and elastic and has water resistance, antifouling and antibiosis functions, pearl powder-polylactic acid porous fibers added to the slurry have a uniform porous structure, and a flame retardation agent is uniformly dispersed in the resin emulsion, has coating permeability and flame retardation improvement efficacy, endows the coating with multi-angle pearlescent color, and increases the ornamental effect.

The invention discloses a preparation method for preparing a porous gelatin film from a GO (graphene oxide) stabilized Pickering emulsion. The method comprises the steps as follows: a proper amount ofGO is added to deionized water, a GO suspended dispersion liquid is prepared, and ultrasonic treatment is performed; a gelatin solution is dissolved in the GO suspension, benzoate is added to serve as an oil phase, and ultrasonic treatment is performed; a sample in placed in a water bath, then casting is performed, and a non-crosslinked film is obtained; the non-crosslinked film is impregnated ina solution containing a crosslinking agent for a period to be crosslinked, then, the film is washed with ethanol and deionized water, finally, the film is dried, and the gelatin film adopting a porous structure is obtained. The preparation process for preparing the porous gelatin film from the Pickering emulsion is simple, green, environmentally friendly, has low equipment requirement, high aqueous solution stability and uniform porous structure, is prone to large-scale production and has wide application prospects in wastewater separation, gas separation, food emulsification, catalysis, heavy metal ion detection and other fields.

The invention discloses a magnetic porous bentonite chitosan composite microsphere. The magnetic porous bentonite chitosan composite microsphere is characterized by being prepared from the following raw materials in parts by weight: 1-10 parts of bentonite, 1-5 parts of acetic acid, 1-3 parts of chitosan, 1-6 parts of ferric chloride hexahydrate, 1-3 parts of ferrous chloride tetrahydrate, 10-15 parts of sodium hydroxide, 5-10 parts of sodium citrate and 200-250 parts of water. High-porosity chitosan hydrogel microsphere is modified and led into a magnetic medium, and bentonite is loaded intothe microsphere to successfully prepare the magnetic porous bentonite chitosan composite microsphere with relatively strong cesium-ion adsorption ability and ability of utilizing a magnetic technologyto recycle. The magnetic porous bentonite chitosan composite microsphere has the characteristics of being high in adsorption rate, great in adsorption capacity, insensitive to pH and wide in scope ofapplication; and the magnetic porous bentonite chitosan composite microsphere can be gathered through external magnetic fields, solid-solution separation is easily realized, and recycling is convenient; and the whole preparation process is simple, operation time is short, and control is easy.

The invention discloses a preparation method of a super-amphiphobic nano cellulose aerogel, and belongs to the technical field of high polymer materials. The preparation method comprises the followingsteps: by taking nanocellulose prepared by TEMPO oxidation method and nano-SiO2 particles prepared by Stober method as raw materials, preparing a mixed suspension, injecting the mixed suspension intoa mold, freezing in liquid nitrogen, and then freeze-drying under a low-temperature condition to obtain nanocellulose aerogel; adopting a chemical vapor deposition method; carrying out amphiphobic modification on the surface of the obtained nanocellulose aerogel with THFOS so as to obtain the super-amphiphobic nano cellulose aerogel. The average contact angle of the super-amphiphobic nano cellulose aerogel with water, castor oil, and hexadecane reaches 166 degrees, 157 degrees and 150 degrees, and the super-amphiphobic nano cellulose aerogel has the common characteristics of super-amphiphobicmaterials such as water resistance, and oil repellency, and has a good industrial application prospect.

The invention discloses a preparation method of a spinel type oxide catalyst. One or two transition metals of cobalt, iron, nickel, manganese, copper, chromium and zinc and aluminum are jointly heatedto a molten state by adopting a vacuum induction melting furnace, cooling is performed to obtain a rod-shaped alloy ingot, a vacuum melt-spinning device is employed for melting for blow casting intoa corresponding alloy strip, carrying out dealloying treatment on the alloy strip in an alkaline solution to obtain a dealloyed product, and in order to improve the crystallinity and stability of thematerial, the dealloyed product is placed in a tubular furnace for high-temperature annealing treatment in an air atmosphere, thus obtaining the spinel type oxide catalyst. The invention also relatesto application of the electrode material. The obtained catalyst has a multi-metal mixed valence state, can significantly enhance the conductivity of the material, shows good electrocatalytic activityto oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in an alkaline environment, has good stability, and can be used as a cathode catalyst of a chargeable and dischargeable metal-airbattery.

The invention discloses a preparation method and application of a novel lithium ion battery negative electrode material carbonized grape seed. The preparation method comprises the following steps: drying grape seeds, grinding into powder, soaking in an activator solution, and magnetically stirring the solution at 80 DEG C for 4 hours; and filtering the solution, carrying out vacuum drying on the soaked grape seed powder at 80 DEG C for 12 hours, putting the dried grape seed powder into a tubular furnace, calcining the grape seed powder at 700-900 DEG C for 2-6 hours in an argon atmosphere, cooling the grape seed powder to room temperature, sequentially carrying out centrifugal washing with hydrochloric acid and distilled water to neutrality, carrying out vacuum drying, and grinding the grape seed powder to obtain the target product carbonized grape seeds. The carbonized grape seeds are used as the negative electrode material of the lithium ion battery, so that the raw materials are easy to obtain and are environment-friendly; secondly, the carbonized grape seeds have a porous structure, so that the reaction active sites are increased, the conductivity of the material can be improved, and the electrochemical performance of the material is improved.

The invention discloses a method for preparing foam concrete by secondary foaming, and belongs to the technical field of foam concrete preparation. The method includes: modifying polyester fibers and pearl fibers by water glass and hexadecyl trimethyl ammonium bromide to obtain mixed modified fibers, adding the mixed modified fibers into cement, adding coal ash, coal gangue and the like and water into the cement, stirring to mix, performing ball milling to obtain concrete pulp, preparing a foaming liquid from water, sodium dodecyl benzene sulfonate, triethanolamine and arachidonic acid, adding egg white into the cement and grinding for primary foaming, adding the foaming liquid into the cement for secondary foaming so as to obtain foam concrete pulp, shaping and maintaining to obtain the foam concrete. The prepared foam concrete is provided with a uniform porous structure, a water absorption rate of the foam concrete is lower than 8%, so that high anti-permeability is realized; in addition, the foam concrete has the advantages of low shrink, no cracking and high compressive strength, and is wide in application space.

The invention provides carboxylated porous polystyrene microspheres and a preparation method thereof. The preparation method of the carboxylated porous polystyrene microspheres comprises steps as follows: 1), seed microspheres are swollen by cyclohexane; 2), the seed microspheres obtained in the step 1) are subjected to further swelling by styrene monomers, functional acrylic monomers, a crosslinking agent and a pore-foaming agent; a protective agent and an aqueous phase polymerization inhibitor are added to a system obtained after swelling in the step 2), and then a polymerization reaction isperformed; the seed microspheres are polystyrene microspheres. The carboxylated porous polystyrene microspheres obtained with the preparation method of the carboxylated porous polystyrene microspheres are not only uniform in size, but also contain rich and uniform carboxyl functional groups on the surfaces, and are of a uniform porous structure.

The invention discloses a method for preparing a porous chitosan membrane from a GO-stabilized Pickering emulsion. The method comprises the following steps: adding a proper amount of GO into deionizedwater so as to prepare a GO suspension dispersion solution and carrying out ultrasonic treatment; dissolving a chitosan solution into the GO suspension dispersion solution, adding benzoic acid esteras an oil phase and then carrying out ultrasonic treatment; placing a sample in a water bath and then carrying out casting to obtain an uncross-linked membrane; impregnating the uncross-linked membrane in a solution containing a cross-linking agent for cross-linking of the membrane for a period of time, then carrying out washing with ethanol and deionized water; and finally drying the membrane soas to obtain the chitosan membrane with a porous structure. The preparation method provided by the invention is simple in preparation process, friendly to environment and low in requirements on equipment; high stability of aqueous solutions is realized; the porous structure is uniform; large-scale production of the membrane can be easily implemented; and the porous chitosan membrane has good application prospects in the fields of food preservation, wastewater treatment, catalysis, heavy metal ion detection and the like.