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2625 results about "Tetraethyl orthosilicate" patented technology

Tetraethyl orthosilicate, formally named tetraethoxysilane and abbreviated TEOS, is the chemical compound with the formula Si(OC₂H₅)₄. TEOS is a colorless liquid that degrades in water. TEOS is the ethyl ester of orthosilicic acid, Si(OH)₄. It is the most prevalent alkoxide of silicon.

Superhydrophobic composite coating with self-repair function and preparation method thereof

The invention relates to a superhydrophobic composite coating with self-repair function, which solves the problem of low mechanical strength in the existing self-repair superhydrophobic coating. The superhydrophobic composite coating with self-repair function is prepared from the following raw materials in parts by weight: 1-20 parts of graphene, 1-20 parts of tetraethyl orthosilicate or tetrabutyl titanate, 1-20 parts of ammonia water, 1-5 parts of low-surface-energy modifier, 60-90 parts of low-surface-energy high-molecular polymer, 2-7 parts of pore forming agent, 5-25 parts of deionized water and 60-100 parts of organic solvent. The pore structure constructed inside the coating can keep a coarse structure for a long time in the friction process. The high-strength graphene can enhance the mechanical strength of the coating, thereby keeping high hydrophobicity and oleophobicity of the coating in the friction process. After the rubbed coating is subjected to simple heating treatment, the low-surface-energy substances stored and grafted in the nano storage tank structures among the multilayer graphene can be activated, and thus, can migrate to the coating surface, thereby implementing the hydrophobic and oleophobic repair of the coating.
Owner:NORTHEAST GASOLINEEUM UNIV

Mono-dispersed spherical mesoporous silicon dioxide nanomaterial and preparation method thereof

The invention relates to a mono-dispersed spherical mesoporous silicon dioxide nanomaterial, which is characterized in that: the nanomaterial has a spherical structure of which the particle diameter is 80-200 nanometers; the relative standard deviation of the particle diameter is not more than 8 percent; the specific surface area of the material is 1,057-1,379 m<2>/g; the pore volume is 0.74-0.89 cm<3>/g; the mesoporous pore diameter is 2.4-2.6 nanometers; and the nanometer material has a pore canal structure formed radially from the center of a sphere to an outer surface. The mono-dispersed spherical mesoporous silicon dioxide nanomaterial is prepared by hydrolyzing and condensing by taking a cationic surfactant as a template, tetraethyl orthosilicate as a silicon source and alcohol as a cosolvent under alkaline condition. The method has the advantages of simple equipment, easiness of operation, short preparation period, high repeatability, high yield, low cost and environment friendliness. The prepared silicon dioxide material is of spherical nanoparticles which have controllable particle diameters, uniform particle diameter distribution, high mono-dispersity, narrow pore diameter distribution and ordered mesoporous pore canal structures.
Owner:OCEAN UNIV OF CHINA

Preparation method of graphene oxide and magnetic mesoporous silica composite material capable of adsorbing pollutants in water

InactiveCN103432996AAdjust the content of magnetic substancesLow costOther chemical processesAlkali metal oxides/hydroxidesAlkanePolyetherimide
The invention relates to a preparation method of a composite material prepared by graphene oxide and magnetic mesoporous silica microspheres through chemical bonding interaction. The magnetic particles are prepared by a hydrothermal process; after acid ultrasonic treatment, the magnetic particles are firstly coated with a thin silicon oxide shell layer by a sol-gel method; after that, long-chain alkane is taken as a pore-forming agent, the magnetic particles are copolymerized with tetraethyl orthosilicate (TEOS) in the sol-gel reaction, and then the pore-forming agent is removed by thermal etching, so that the magnetic mesoporous silica particles with certain hydroxyl on the surfaces can be obtained; polyetherimide (PEI) surface modification is carried out on the magnetic mesoporous silica particles, and strong interaction between PEI and silicon hydroxyl is utilized; finally, the carboxyl on ethylene dichloride (EDC) activated graphene oxide reacts with amino on the PEI, so that the graphene oxide magnetic mesoporous silica composite material can be obtained. The preparation method is simple, convenient and controllable and is favorable for amplification preparation. The composite material has large specific surface area and good magnetic controllability, and can adsorb humic acid and heavy metal ions Pb (II) at the same time by virtue of surface groups.
Owner:TONGJI UNIV

Method for preparing NCC/CS/PVA composite nano-membrane

The invention relates to a method for preparing an NCC/CS/PVA composite nanofiber membrane. NCC is rod-shaped particles, wherein the diameter of each particle ranges from 20 nm to 60 nm, and the particles are highly crystallized. The method comprises the steps that (1) an NCC/CS solution is prepared, wherein the concentration of the NCC, by weight, ranges from 0.09% to 0.21%; (2) an NCC/PVA solution is prepared, wherein the concentration of the NCC, by weight, ranges from 0.4% to 0.8%; (3) an acetic acid solution, tetraethyl orthosilicate, the NCC/CS solution obtained in the step (1) and processed through ultrasound, and the NCC/PVA solution obtained in the step (2) and processed through ultrasound are mixed to obtain a spinning solution, and the nanofiber membrane is obtained through the electrospinning technology, wherein the mass ratio of the acetic acid solution to the tetraethyl orthosilicate to the NCC/CS solution to the NCC/PVA solution is (2.5-3.5):(1.5-2.5):5:5; (4) the obtained nanofiber membrane is immersed in an alkaline solution for 2-6 hours at the normal temperature, and the membrane structure can be stable. The method for preparing the NCC/CS/PVA composite nanofiber membrane has the advantages that the nanofiber material preparation process is simple, the preparation process is environmentally friendly and free of pollution, nanofibers are excellent in mechanical performance, the surface of the nanofiber membrane is rich in modifiable functional groups, and the nanofiber membrane has a remarkable affinity effect on biomacromolecule.
Owner:TONGJI UNIV

Temperature and pH stimuli-responsive intelligent polymer microcapsule and preparation thereof

The invention relates to a temperature and pH stimuli-responsive intelligent polymer microcapsule and preparation thereof. The microcapsule comprises two polymers sensitive to temperature and pH, and an interpenetrating network structure is formed between the two polymers. Preparation includes the following steps: (1) uniformly blending tetraethyl orthosilicate, aqueous ammonia, water and absolute ethyl alcohol, and then adding surface modifier; (2) adding temperature-sensitive monomer and crosslinking agent into the modified dispersion, and adding initiator for reaction; (3) after diluting the emulsion by five to fifteen times, adding pH-sensitive monomer and crosslinking agent, and adding initiator for reaction; and (4) dispersing the white emulsion of core-shell composite particles with shells formed into a interpenetrating polymer network structure into hydrofluoric acid, and carrying out centrifugal separation or dialysis purification. The microcapsule can respectively respond tothe stimulation of temperature and pH, and moreover, the two types of stimuli responsiveness are independent from each other, and therefore have little interference on each other. The preparation method is simple, and is suitable for industrial production.
Owner:DONGHUA UNIV

Modified ZSM-5 molecular sieve catalyst, preparation method and application in toluene methanol alkylation reaction

The invention relates to a modified ZSM-5 molecular sieve catalyst used for toluene methanol alkylation, which takes a ZSM-5 molecular sieve as a matrix, molecular sieve raw powder is taken as a commodity reagent, its scaled silica-alumina ratio (nSiO2/nAl2O3) is 25, the particle sizes can be divided into two types, the primary particle size of the large particle size (or conventional particle size) ZSM-5 belongs to the micron order, the primary particle size of the small particle size ZSM-5 is about 200 nanometers, tetraethoxysilane (TEOS) is taken as a silicon source, an external surface and hole opening of the molecular sieve can be modified through chemical liquid phase deposition, the SiO2 deposition amount is between 3% and 25%, or chemical modification of Ni and P elements is employed, and the contents of Ni and P elements are 0-1% and 0-8%. According to the invention, the modified ZSM-5 molecular sieve catalyst can be used for preparing xylene by the toluene methanol alkylation with high catalytic activity, the conversion for per pass of toluene can reach more than 30%, in three types of xylene products, the selectivity on xylene is higher than 90%, and the modified ZSM-5 molecular sieve catalyst of the invention is the catalyst possessing high activity and high selectivity.
Owner:NANJING UNIV

Method for preparing rare earth-doped yttrium aluminum garnet transparent ceramic

ActiveCN101985397AHigh linear transmittanceImprove mechanical propertiesRare-earth elementSpray Granulation
The invention relates to a method for preparing rare earth-doped yttrium aluminum garnet transparent ceramic. In the invention, high-transparency polycrystalline ceramic is prepared by using commercial powdered Y2O3, Al2O3 and Re2O3, of which the purities are over 99.9 percent, as main raw materials and by spray granulation dry pressing molding process and vacuum reaction and sintering, wherein the Re may be one or several of trivalent rare earth elements such as Nd<3+>, Yb<3+>, Cr<3+>, Er<3+>, Ce<3+>, Sm<3+> and Eu<3+>; MgO or CaO or tetraethyl orthosilicate (TEOS) or SiO2 is used as a sintering assistant; a certain amount of bonding agent, plasticizer and dispersant is added; the oxides, sintering assistant and additive are mixed and added into a liquid medium, and the mixture is ball-milled and mixed for 0.5 to 100 hours; after the powder materials are mixed uniformly, the powder is made into spherical or approximately spherical grains; blanks formed by drying pressing isostatic forming are degreased; sintering the blanks in a vacuum sintering furnace; and annealing after sintering. The transmissivity at a laser wavelength of the rare earth-doped yttrium aluminum garnet transparent ceramic prepared by the method is more than or equal to 77 percent.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI

Catalytic agent for preparing ethanol by using acetic acid hydrogenation and preparation method thereof

A catalytic agent for preparing ethanol by using acetic acid hydrogenation and a preparation method thereof relate to a hydrogenation catalyst and are high in stability and long in service life. The catalytic agent is applicable to a high pressure fixed bed reactor, glacial acetic acid is adopted to serve as raw materials directly, and service life of the catalytic agent is longer than 1000h. The catalytic agent is composed of reactive metal, an accessory ingredient, a protective agent and a carrier, a weight ratio of constitution elements of the reactive metal, the accessory ingredient, the protective agent and the carrier in the catalytic agent is (1-5):(0-10):(0-20):100, the reactive metal is preferentially selected from one of platinum, ruthenium and palladium, the accessory ingredient is preferentially selected from one of Ferrum, cobalt and stannum, the protective agent is preferentially selected from boric acid or tetraethoxysilane, and the carrier is preferentially selected from carbon nano tubes or silica. The catalytic agent is prepared by using an impregnation method. Introduction of the protective agent greatly improves heat stability of the catalytic agent, the method is simple, performance is excellent, stability is high, and the catalytic agent has good industrial application prospects.
Owner:XIAMEN UNIV +1

Preparation method of silicon-based anode material for lithium ion battery

The invention discloses a preparation method of a silicon-based anode material for a lithium ion battery. The preparation method comprises the following steps of using tetraethyl orthosilicate as a silicon source and nanometer aluminum oxide as a template agent to prepare a silicon dioxide coated nanometer aluminum oxide material, and then carrying out magnesiothermic reduction and acid treatment to obtain hollow porous silicon; coating the surface of the hollow porous silicon with a layer of polydopamine by means of self-polymerization of dopamine; and carrying out thermal treatment to prepare hollow porous silicon coated with a polydopamine pyrolytic carbon layer, namely the silicon-based anode material for the lithium ion battery. A porous silicon hollow structure can be used for providing a certain expansion space for volume changes during the charging and discharging process of silicon, a nitrogen-doped carbon layer formed after thermal treatment on the polydopamine has higher mechanical property and electrical conductivity than conventional carbon layers, thus, the silicon-based anode material disclosed by the invention has favorable cycle performance and rate performance, and the retention rate of the charge specific capacity of the silicon-based anode material is still kept 90% after 50 times of cycling.
Owner:CENT SOUTH UNIV

Preparation and application of super-hydrophobic/oleophobic coating layer with excellent performance

The invention relates to preparation and application of a super-hydrophobic / oleophobic coating layer with excellent performance, wherein the preparation comprises the steps: dispersing nanoparticles and cellulose in an alkaline substance-containing alcoholic solution, and adding tetraethyl orthosilicate and fluorine-containing organosilane for hydrolytic coating to form a solution A; dispersing epoxy resin in an alcoholic solution to form a solution B; uniformly mixing the solution A and the solution B, and then adding tetraethyl orthosilicate and fluorine-containing organosilane to react to generate polysiloxane, to obtain a solution C; dissolving a fluorine-containing amine compound in an alcoholic solution to obtain a solution D; and uniformly mixing the solution C and the solution D, spraying the mixture on a substrate, and curing to obtain the product. A multi-stage micro-nano hierarchical structure is constructed; the super-hydrophobic / oleophobic coating layer has good chemical stability, can achieve a complete repelling effect on N,N-dimethylformamide liquid drops (34.4 mN / m), has a contact angle of 120 degrees on n-hexadecane (27.1 mN / m), is simple in preparation method, can be sprayed on a large scale, and paves a road for industrialization of the super-hydrophobic / oleophobic coating layer.
Owner:QILU UNIV OF TECH

Nanometer material with controllable particle sizes and silicon dioxide hollow spheres and method for preparing nanometer material

ActiveCN106044788ALimit multidirectional growthReduce interfacial surface tensionMaterial nanotechnologySilicaSolventSolvothermal reaction
The invention discloses a nanometer material with controllable particle sizes and silicon dioxide hollow spheres and a method for preparing nanometer material. TEOS (tetraethyl orthosilicate) is used as an organic silicon source, CTAB (cetyl trimethyl ammonium bromide) is used as a structure directing agent, water, ethyl alcohol and cyclohexane are used as solvents, and PVP (polyvinyl pyrrolidone) is used as a stabilizer. The method includes carrying out heat reaction by the aid of the solvents to form precursors of the SiO2 hollow spheres; calcining the precursors and removing organic matters so as to obtain the SiO2 hollow spheres. The nanometer material and the method have the advantages that the silicon dioxide hollow spheres prepared by the aid of the method are excellent in dispersibility and have the adjustable particle sizes (of 220-430 nm), large pore diameters (of 10-12 nm) and uniform shell thicknesses, and cavities are large and can be used for storing large quantities of guest molecules; the nanometer material is high in chemical stability and packaging capacity and can be widely applied to the fields of enzymatic catalysis, substance adsorptive separation and the like; the method includes simple synthesis processes, is clean and is free of pollution and low in cost, and preparation procedures are good in repeatability.
Owner:山东济清科技服务有限公司
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