35results about How to "Adjustable pore size distribution" patented technology

The invention belongs to the field of foam ceramic, and particularly relates to an alumina fiber-enhanced nano-alumina foam ceramic and a preparation method thereof. The alumina fiber-enhanced nano-alumina foam ceramic comprises the following raw materials: a nanometer aluminum oxide powder, a premix solution, a dispersing agent, aluminum oxide fiber, a foaming agent, an initiator and a catalyst, wherein premix solution is formed by adding a monomer and a crosslinking agent into an alcohol-water mixed solution; and the mass ratio of the alumina fiber to nano-alumina powder is (5-30): (95-70). By adopting the alcohol-water mixed solution as a solvent for gel casting, the surface tension among particles can be reduced, and the quality of dry blanks can be increased; the compressive strength of the finished product is more than 30MPa, the porosity is more than 50%, the volume density is less than 3g/cm<3>; the usage temperature is 1500-1750DEG C, the alumina fiber-enhanced nano-alumina foam ceramic is a lightweight and high temperature-resistant refractory material, and can be used in the field of lining materials of a high-temperature electric resistance furnace. The invention further provides a preparation method of the alumina fiber-enhanced nano-alumina foam ceramic, thus being suitable for industrial production.

The invention discloses high-strength carbon aerogel as well as a preparation method and application thereof, and belongs to the technical field of preparation of phenolic and carbon aerogel. The preparation method comprises the following steps: industrial phenolic resin is used as a raw material, hexamethylenetetramine is used as a curing agent, ethylene glycol and water are used as solvents, mixing is performed, a sol-gel reaction is performed at a certain temperature, normal-pressure drying is performed to obtain phenolic aerogel, and carbonization is performed at a high temperature to obtain the carbon aerogel, wherein the aerogel microstructure is a three-dimensional network structure in which particles are interconnected. The preparation technology of the aerogel provided by the invention has the following three advantages: 1) the raw material is the industrial phenolic resin, so that the source is wide and the price is low; 2) the preparation cycle is short, the mixed liquid issolidified to obtain a wet gel without solvent replacement, the phenolic aerogel can be obtained by direct drying, and the preparation cycle is 2-3 days; and 3) normal-pressure drying is adopted, theequipment requirements are simple, and the processability is good.

The invention discloses a preparation method of a boron-doped porous carbon material. The preparation method comprises the following steps: (1) preparing a mixed solution; (2) preparing polyamide acid(PAA)/boric acid composite film; (3) preparing polyimide (PI)/boric acid composite film; and (4) preparing the boron-doped porous carbon material. The porous carbon material can be directly used forpreparing the high-performance miniature super-capacitor. The method is fast and simple and low in cost, the prepared porous carbon material is high in specific area, adjustable in aperture distribution and good in conductivity, the porous carbon material can be directly patterned and a certain amount of boron is doped, and the porous carbon material can be used for preparing the high-performanceminiature super-capacitor.

The invention relates to a preparation method of epoxy resin-based polymer monolithic column; a given quantity of the epoxy resin and firming agents and a low molecular weight polymer mixture with a good compatibility used as pore-forming agents are added in an empty tube column; solidification temperature is controlled so as to regulate the speed of polymerization reaction; after the solidification is finished, the pore-forming agents are removed by washing so as to get the polymer monolithic column. The preparation process of the invention is simple and environmental friendly. The invention also discloses a dedicated mould. The monolithic column can be made into various specifications and forms as required and has the advantages of evenly distributed aperture, adjustable size, strong hydrophilic property, acid and alkali resistance, solvent resistance and good thermostabilization; and a large number of reactive functional groups are contained in the chemical constitution of the material of the monolithic column, which is suitable for performing a plurality of chemical modifications to an inner surface of a pore canal so as to further functionalize. The preparation method of the epoxy resin-based polymer monolithic column can be applied extensively to the fields such as the extraction and recovery of solid phase, the preparation of chromatogram, the separation of biological medicines, the environmental protection and the catalysis etc.

The invention provides a supported cobalt-based catalyst for Fischer-Tropsch synthesis. The supported cobalt-based catalyst is composed of cobaltosic oxide, an oxide of a precious-metal aid, an oxide of a non-precious-metal aid and a tungsten carbide carrier in a weight ratio of (10-80): (0-3): (0-20): 100. The supported cobalt-based catalyst has the advantages of high mechanical strength and good thermal conductivity.

The invention provides a preparation method of a C/SiC composite material. The C/SiC composite material is prepared by preparing a porous C/C composite material by means of an infiltration method. Asa special high-activity porous body C/C is adopted to reactive infiltration, the mechanical property and the anti- ablation property of the material are improved. The preparation method can be also applied to rapid low-cost preparation of a ceramic-based composite material.

The invention discloses a cross-linking agent modified XAD-4 resin, which is a mesoporous resin containing rich micropores and prepared from a cross-linking agent and an XAD-4 resin through Friedel-Crafts reaction, wherein the pore diameters of the mesoporous resin are distributed between 1 to 9.5 nm, the average pore diameter is 2.58-4 nm, the specific surface area is 721-1284 m<2>/g, and the pore volume is 0.67-1.1 cm<3>/g. The method for preparing the cross-linking agent modified XAD-4 resin comprises the following step of carrying out the Friedel-Crafts reaction between the cross-linking agent and the XAD-4 resin to prepare the modified XAD-4 resin, wherein the dosage of the cross-linking agent is 50-100% of the quantity of the XAD-4 resin material. The adsorbent has the characteristics of large specific surface area, narrow pore diameter distribution and easily controllable porous structure, and is obviously superior to the XAD-4 resin in the adsorption capability to nonpolar and weakly polar materials; and therefore, the adsorbent is wide in application prospect in fields of treating and recycling phenols wastewater and the like.

The invention discloses a preparation method of a crosslinking nanofiltration membrane. The method comprises the steps of completely dissolving phenolic resin and tetraethenyl triamine in a certain mass ratio through a medium, wherein the mass ratio of phenolic resin to tetraethenyl triamine is (2-3):(5-6), and the mass ratio of phenolic resin to the medium is (8-10):(2-3); uniformly agitating to obtain a settled solution, wherein the medium is prepared from polyethylene glycol and a surface active agent OP-10 in the mass ratio of (4-8):(2-3); removing bubbles; adding a crosslinking agent, namely, a formaldehyde solution; continuously agitating; preserving heat for 1 to 24 hours at the temperature of 60 to 80 DEG C in a drying tank; agitating for 2 to 4 minutes at the rotating speed of 1,000 to 3,000r/min to obtain a casting membrane solution; coating a glass sheet with the generated casting membrane solution by a film casting method; drying under a vacuum condition at the temperature of 60 to 80 DEG C; soaking for 2 to 4 hours through a diethyl ether solution to remove the medium, namely, polyethylene glycol and the surface active agent OP-10; washing with alcohol and distilled water for a plurality of times; and then drying to obtain the crosslinking nanofiltration membrane. The method is performed under mild preparation conditions, does not have strict requirements, is convenient to operate, enables simple forming, and meets the demand on mass production; the prepared nanofiltration membrane is of a symmetric structure, and is uniform in pore size distribution, adjustable in pore size, and outstanding in repeatability.

The invention discloses an adsorbent for removing hexafluoropropylene in octafluorocyclobutane. The adsorbent comprises, by weight, 10-25% of iron oxide, 5-20% of copper oxide, 60-80% of tin oxide, 0.05-0.5% of gallium, 0.05-0.3% of platinum, 0.1-1.5% of cadmium and 0.1-3% of molybdenum. The invention further discloses a method for preparing the adsorbent. The method includes steps of (1), addingsalt solution of the iron oxide, the copper oxide and the tin oxide into a hydrothermal reactor and uniformly stirring the salt solution of the iron oxide, the copper oxide and the tin oxide; (2), adding salt solution of the gallium, the platinum, the cadmium and the molybdenum into the hydrothermal reactor and carrying out doping modification; (3), adding metal mesh packing into the hydrothermalreactor, placing the hydrothermal reactor with the added metal mesh packing into a drying oven and carrying out reaction on solution in the hydrothermal reactor at the hydrothermal treatment temperatures of 110-160 DEG C for 40-70 min. The adsorbent and the method have the advantage that the hexafluoropropylene in the octafluorocyclobutane can be effectively removed by the adsorbent.

The invention discloses a preparation method of a Ca-Mg-Al-Si porous microcrystalline glass, and belongs to the field of microcrystalline glass filter materials. The preparation method comprises following steps: weighing MgO, SiO2, CaO, Na2CO3, Na2B4O7, Al2O3, Fe2O3, and stainless steel slag, evenly mixing, adding the mixture into a crucible, placing the crucible in a muffle furnace, maintaining atemperature of 1400 to 1500 for 3 to 5 hours; taking out the mixture, quenching the mixture by cold water to obtain water quenched glass; breaking the water quenched glass, ball-milling the glass, fully mixing the glass with NaCl, placing the mixture in an electric spark plasma sintering furnace, carrying out hot pressed sintering for 1 to 3 minutes at a constant temperature of 650 to 725 DEG C under a pressure of 45 to 50 kN; placing sintered and moulded Ca-Mg-Al-Si porous microcrystalline glass into water, washing, and soaking to obtain the Ca-Mg-Al-Si porous microcrystalline glass. The provided preparation method can obtain the porous microcrystalline glass for different filter objects, the porosity and pore size of the microcrystalline glass are adjustable, the strength is high, and the microcrystalline glass has communicated pores.

The invention discloses a mesoporous magnesium oxide material and a preparation method thereof, and belongs to the technical field of preparation and application of magnesium oxide materials. Glucoseis added into water to obtain a glucose aqueous solution; magnesium nitrate is added into the glucose aqueous solution and stirred for 5-10 min under the condition of room temperature, and a magnesiumnitrate and glucose aqueous solution is obtained; the magnesium nitrate and glucose aqueous solution is subjected to heat treatment at the temperature of 100-120 DEG C for 24-48 hours, and water molecules in the solution are evaporated to obtain a magnesium nitrate and glucose mixture; finally, the mixture is subjected to heat treatment at 500-600 DEG C for 2-4 hours to obtain the mesoporous magnesium oxide material. The prepared mesoporous magnesium oxide material is of a three-dimensional porous structure, the pore size is 2-10 nm, the volume of pores is 0.5-1.5 cm<3>/g, and the BET specific surface area is 100-300 m<2>/g. The prepared mesoporous magnesium oxide material is large in specific surface area, high in porosity and controllable in pore size distribution, and also has excellent characteristics of the magnesium oxide materials. The mesoporous magnesium oxide material has important application prospects in many fields due to the special mesoporous structure.

The invention relates to the technical field of heat insulation and heat preservation materials, in particular to a cork aluminum oxide porous composite material prepared by utilizing the natural cell structure and flame retardant property of cork, and particularly relates to a composite material prepared from cork oak bark cork and aluminum oxide and a preparation method. The material contains the following components in parts by weight: 70-98 parts of aluminum oxide, 1-25 parts of softwood and 1-5 parts of binder, the softwood is used as a pore-forming agent, the softwood/aluminum oxide porous composite material is prepared by using the natural cellular structure and flame-retardant characteristic of the softwood, and the pore size distribution and porosity are adjustable; the cork/alumina porous composite material prepared by the invention has the advantages of high porosity, small density, high compression strength, low thermal conductivity and favorable heat insulation property, can be used as a furnace lining material of a high-temperature kiln, effectively solves the problem of shortage of high-temperature furnace lining materials in China, and has important significance for realizing energy conservation and emission reduction and improving the additional value of cork products; the material can be widely applied to the heat insulation fields of high-temperature furnaces, buildings, transportation, aerospace and the like.

The invention discloses a mesoporous magnesium silicate/polybutylene succinate composite scaffold as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing polybutylene succinate with an organic solvent, so as to obtain a mixture I; (2) mixing mesoporous magnesium silicate and a pore-foaming agent with the mixture I in the step (1), so as to obtain a mixture II; and (3) compressing the mixture II in the step (2), removing the organic solvent, and removing the pore-foaming agent, and drying. By utilizing the mesoporous magnesium silicate/polybutylene succinate composite scaffold, the adhesion and proliferation of an MC3T3-E1 cell and activity expression of ALP can be obviously promoted, and in-vivo osteogenesis can be promoted. The preparation method is simple and convenient in operation, and the prepared mesoporous magnesium silicate/polybutylene succinate composite scaffold has good pore connectivity, uniform aperture and excellent in-vitro degradability and biological activity and is capable of releasing silicon and magnesium ions and beneficial to osteoblastic differentiation.

The invention relates to a mesoporous carbon material, which takes mesoporous silica as a template and uses glucose as a carbon source, and a preparation method of the mesoporous carbon material, belonging to the technical field of preparation and application of carbon materials. The preparation method comprises the steps of adding 1-10g of the glucose into 1-6g of the mesoporous silica, and stirring for 5-10min at the room temperature so as to obtain a mixture of the mesoporous silica and the glucose; after that, carrying out heat treatment for 12-24h at the temperature of 180-200 DEG C so asto prepare a mesoporous silica and carbon composite material; carrying out heat treatment for 2-4h at the temperature of 800-900 DEG C so as to prepare a mesoporous silica and mesoporous carbon composite material, adding a hydrofluoric acid aqueous solution into the composite material, and stirring for 12-24h at the room temperature; finally, carrying out centrifugal separation on the obtained solution, washing, and drying to obtain the mesoporous carbon material. The mesoporous carbon material has a three-dimensional porous structure, the pore sizes are 2-5nm, the pore volumes are 0.5-1.5cm<3>/g, and the BET specific surface area is 400-900m<2>/g.

The invention provides a rare earth composite oxide with high heat resistance and a preparation method thereof, and belongs to the field of rare earth materials. The rare earth composite oxide comprises the following components in parts by weight: 50-90 parts of ZrO2, 5-40 parts of CeO2, 5-20 parts of rare earth oxide except cerium oxide, and 0-10 parts of transition metal oxide. According to theinvention, the sulfate is added in two steps in the early stage and a structure regulator is added in the later stage to control the granularity, pore size distribution, specific surface area and porevolume of the rare earth composite oxide, so that the thermal stability of the rare earth composite oxide is improved at the same time.