2183 results about "Nano porous" patented technology

A method and apparatus for depositing nano-porous low dielectric constant films by reaction of a silicon hydride containing compound or mixture optionally having thermally labile organic groups with a peroxide compound on the surface of a substrate. The deposited silicon oxide based film is annealed to form dispersed microscopic voids that remain in a nano-porous silicon oxide based film having a foam structure. The nano-porous silicon oxide based films are useful for filling gaps between metal lines with or without liner or cap layers. The nano-porous silicon oxide based films may also be used as an intermetal dielectric layer for fabricating dual damascene structures. Preferred nano-porous silicon oxide based films are produced by reaction of 1,3,5-trisilanacyclohexane, bis(formyloxysilano)methane, or bis(glyoxylylsilano)methane and hydrogen peroxide followed by a cure/anneal that includes a gradual increase in temperature.

The invention belongs to the technical field of nanoporous material, namely carbon aerogel, and particularly relates to graphene oxide-crosslinked polyimide-based carbon aerogel and a preparation method thereof. The invention carbon aerogel is prepared by crosslinking polyamide acid aerogel by graphene oxide, and comprises the components of graphene oxide and one or more water-soluble polyimide precursor-polyamide acids. The preparation method comprises the following steps: mixing an aqueous graphene oxide solution with the water-soluble polyimide precursor-polyamide acid, and preparing graphene oxide/polyamide acid aerogel through sol-gel and freeze-drying processes; preparing the graphene/polyimide-based carbon aerogel through thermal imidization and high temperature carbonization. According to the preparation method, a toxic reagent formaldehyde is not used; the prepared carbon aerogel has a mesoporous, microporous and macroporous three-level three-dimensional network porous structure, high specific surface area, high conductivity and stable physical and chemical properties, and is an ideal electrode material for preparing a supercapacitor and other new energy devices and a high-performance adsorbent material.

The invention discloses a nanometer high temperature resistant thermal insulation and prevention coating. SiO2 aerogel, modified potassium hexatitanate whisker, aluminum silicate fiber, ultra-fine cenosphere, nanometer TiO2 and nanometer Al2O3 are used as a thermal insulation filler. A vacuum thermal insulation layer is formed by nano porous structures of SiO2 aerogel and cenosphere. The aluminum silicate fiber is used as a reinforcing and toughening material. The infrared shading performance of potassium hexatitanate whisker, nanometer TiO2 and nanometer Al2O3 are used as a thermal radiation shielding layer. A silicon resin emulsion and an acrylic emulsion are compounded to be an adhesive. Therefore, the nanometer 600 DEG C temperature resistant thermal insulation and prevention coating is prepared with matching of a variety of functional additives. The nanometer high temperature resistant thermal insulation and prevention coating has the characteristics of scumbling, thermal insulation, waterproofing, anti-crack, anti-corrosion, high temperature resistance, weather-proofing, durability and the like and is applicable to the field of industrial high temperature resistant thermal insulation energy conservation.

Embodiments in accordance with the present invention relate to multi-stage curing processes for chemical vapor deposited low K materials. In certain embodiments, a combination of electron beam irradiation and thermal exposure steps may be employed to control selective outgassing of porogens incorporated into the film, resulting in the formation of nanopores. In accordance with one specific embodiment, a low K layer resulting from reaction between a silicon-containing component and a non-silicon containing component featuring labile groups, may be cured by the initial application of thermal energy, followed by the application of radiation in the form of an electron beam.

The invention relates to a method for preparing micro/nano porous ceramic fibers by low-temperature electrostatic spinning. With combining electrostatic spinning technology and freeze-drying technology, the micro/nano porous ceramic fibers are prepared by freeze-drying and sintering after electrostatic spinning at a low temperature; and the method comprises four steps of preparing a spinning solution, electrostatic spinning at a low temperature, freeze-drying and sintering. The method for preparing micro/nano porous ceramic fibers by low-temperature electrostatic spinning can obtain an extremely high specific surface area, and is beneficial to improving performances of contacting, catalyzing, separating and sensing of ceramic fibers, and has wide application prospects in fields of biomedicine, filter materials, catalyst carriers, fuel cells, electronic element appliances and the like.

The invention provides a preparation method of a nano porous metal oxide/carbon lithium ion battery cathode material. The preparation method comprises the following steps: firstly, weighting ferric salt or manganese salt and carboxylate organic ligands, and putting into a high-pressure reaction kettle; and after a polar solvent is added and dissolved, carrying out a hydrothermal reaction for 10-72h at 100-180 DEG C to generate a transition metal coordination polymer precursor; and after the transition metal coordination polymer precursor is washed and dried, decomposing the precursor for 0.5-6h at a temperature of 300-600 DEG C in an inert atmosphere in a tube furnace, thus obtaining a nano porous metal oxide/carbon lithium ion battery cathode material containing iron oxides or manganese oxides. According to the preparation method, since the transition metal coordination polymer precursor which is structurally designable and controllable is used as a template-type precursor, a nano porous metal oxide/carbon lithium ion battery cathode material is obtained by using an in-situ thermal decomposition method. The method is simple in process, and the obtained products have the advantages of high electrical conductivity, high specific capacity, good cycle stability, excellent high-ratio discharge performance and high energy density.

The process of producing silica aerogel block adopts the materials including polysiloxane E-40 as Si source, ethanol, water and hydrofluoric acid; and includes preparing silica aerogel grain via sol-gel and surface modification process at normal pressure, mixing the grain with calcium silicate slurry, rutile type titanium dioxide powder, ceramic fiber, glass fiber and porous cement via powerful stirring, and pressing into block with aerogel content greater than 90 vol%. High strength skeleton may be embedded into the block if necessary. The present invention may be used in insulation, sound isolation and adsorption.

The invention relates to porous concrete and a preparation method thereof, in particular to novel nano porous concrete which is prepared by taking thixotropic colloid as a template agent to form a uniform-water-phase three-dimensional network nano porous structure and adding cementing materials, fine aggregate, coarse aggregate, an admixture and an additive. The nano porous concrete has the characteristics of being light, high in strength and low in heat conductivity, can be prefabricated into bricks, building blocks, plates, and assembly type stairs, wallboards, balcony slabs and roof panel parts in a factory, can be also cast on a construction site, and further can be prepared into mortar, thereby having remarkable practical significance on promotion of development of housing industrialization and green building concrete material in our country.

The invention relates to processes for the synthesis of 2-D and 3-D periodic porous silicon structures and composites with improved properties having the advantages of porous silicon and photonic bandgap materials. Photonic crystals comprise a two dimensionally periodic or three dimensionally periodic microporous structural matrix of interconnecting, crystallographically oriented, monodispersed members having voids between adjacent members, and said members additionally having randomly nanoporous surface porosity. The silicon nanofoam material shows enhanced and spectrally controlled/tunable photoluminescence and electroluminesce and finds use as transparent electrodes, high-lumonosity light emitting diodes (LEDs), wavelength division multiplexors, high-active-area catalyst supports, photonic bandgap lasers, silicon-based UV detectors, displays, gas sensors, and the like.

This invention relates to a silica dioxide aerogel and the preparation method thereof. Said silica dioxide aerogel is surface activity adjustable and nanometer porous. The preparation procedures comprise: use polysiloxane, water, solvent and catalyst as raw material to make wet gel by sol-gel processing, wherein the volume ration of polysiloxane, water, solvent and catalyst is 1:3-15:0.5-1.0:0.02-0.1; conduct surface conditioning of the wet gel, wherein the volume ratio of the coating material and the conditioning solvent is 1:5-15; take out the wet gel to conduct normal pressure drying and sectional thermal treatment, with the temperature range between 100 and 600Deg C. This invention can transform the original hydrophobic state of the aerogel particle to hydrophilic state according to the practical need, suitable for different application requirement. It also has benefits of low cost and simple process, which makes it much qualified for industrial production.

The invention provides a preparation method of an active radical with a surface-enhanced Raman scattering (SERS) effect, belongs to the technical field of spectrum detection, and relates to the preparation technology of the SERS active radical, which is rapid, has high sensitivity and performs a low trace detection function. The preparation method is characterized in that firstly, a nano porous silicon columnar array with a large specific surface area is prepared by utilizing a hydrothermal etching technology; afterwards, a nanowire structure of an II-VI group compound semiconductor (such as zinc oxide, titanium dioxide, cadmium sulfide, cadmium selenide, cadmium telluride, and the like) by utilizing a chemical vapor deposition method; and finally, nano particles of precious metal (such as gold, silver, copper and the like) are finally prepared on the nanowire structure by using a chemical reduction method, so as to obtain an active radical material. The preparation method has a wide application prospect in the aspects of clinical biomolecular fast recognition, trace chemical substance detection, biological sample analysis, and the like. The preparation method has the advantages that the preparation process of each material is simple, the condition is mild and the repetition rate reaches 100 percent.

The invention relates to an ultrathin nanosheet array electro-catalytic material with a nano-porous structure and oxygen vacancies. The material is a cobaltosic oxide primary nanosheet array which grows vertically on a conductive substrate and is doped with a metal; an ultrathin nanosheet with oxygen vacancies and nanopores is obtained on each primary nanosheet; the conductive substrate is a titanium sheet or a foamed nickel sheet, and the doped metal is zinc, nickel or manganese; and the thickness of each cobaltosic oxide ultrathin nanosheet doped with the metal is 1.22 nm, nanosheets are in a three-dimensional porous structure, and the nano-pore diameter is 3-6 nm. The ultrathin nanosheet array electro-catalytic material with the nano-porous structure and oxygen vacancies has the following advantages: the material can effectively reduce the overpotential and the spike potential of an oxygen evolution reaction, increase the conversion rate of a single cobalt atom and work continuously and stably in an alkali environment; the steps of a preparation method of the material are simple, the operation is convenient, the cost is low, and the material is environmental-friendly; and new ideas and strategies are provided for the function-oriented design and the performance optimization of an oxygen evolution catalyst of a water electrolysis system.

The invention discloses a method for preparing nano-porous copper, which relates to manufacturing for metals with nanoscale porosity. The method comprises the following steps of: calculating the masses of the needed raw materials according to the atomic percent at. % of each element in a target alloy Cu (having an atomic percent of 50.00%)-Zr (having an atomic percent of 42.50-50.00%)(-Al (having the remainder atomic percent)), weighing copper sheets, zirconium grains and aluminium blocks, and mixing to obtain a mother alloy raw material; then smelting the mother alloy raw material in a vacuum arc furnace to prepare a Cu-Zr(-Al) alloy ingot; then preparing a Cu-Zr(-Al) amorphous alloy strip by smelting-spinning equipment; and then preparing a nano-porous metallic copper strip by one-step dealloying, cleaning, and then storing the cleaned nano-porous metallic copper strip in a vacuum chamber having a vacuum degree of 0.1 MPa for the later use, so as to avoid oxidation. With the adoption of the method, the defects of complex preparation process, high cost and inconvenience for industrialized large-scale production of the prior art are overcome.

The invention relates to a high temperature insulating coating, comprising thermal- resistant resin, solvent, and nano-porous packing material and hollow microsphere inorganic packing material. The thermal- resistant resin comprises more than one thermal- resistant polymer, nano-porous packing material possesses nano- micropore structure, and the hollow microsphere inorganic packing material is hollow sphere.

The invention belongs to the field of nano-metal functional materials and provides a nano-porous metal material. The aperture of the nano-porous metal material changes in a gradient manner along the length direction or the radial direction of the metal material, so that the nano-porous metal material has broad application prospects in electrochemical porous electrodes, catalyst carriers, biomedical filter parts, composite material products and the like. A preparation method of the nano-porous metal material comprises the following steps of: (1) preparing a precursor alloy containing an active metal and an inert metal; (2) coating the precursor alloy in segments or in parts; and (3) performing dealloying treatment by adopting different dealloying conditions in segments or in parts.

A quantum-sized material and a method for producing such a material according to a predetermined nano-porous polymer template. The method includes the steps of: (a) preparing a nano-porous polymer template, wherein the preparation step includes the sub-steps of (i) dissolving a polymer in a volatile solvent to form an evaporative solution, (ii) depositing a thin film of this solution onto a substrate, and (iii) directing a moisture-containing gas to flow over the spread-up solution film while allowing the solvent in the solution to evaporate for forming a template, which is constituted of an ordered array of nanometer-scaled air bubbles with polymeric walls dispersed in a polymer film; (b) filling the air bubbles with a precursor fluid; and (c) converting the precursor fluid in such bubbles to obtain a quantum-sized material in the form of an array of dots supported in the template. At least one of the dot dimensions is on the 100 nm scale or smaller, preferably smaller than 20 nm.

In one embodiment, the invention provides a positive electrode protective material of a lithium sulfur battery. The material includes a nano-porous carbon network and inorganic nano-particles uniformly distributed therein. Distance of any two adjacent inorganic nano-particles is 3-50 nm. The inorganic nano-particles are metal compound nano-particles or metal-metal compound composite nano-particles. The nano-porous carbon network and the inorganic nano-particles can form an integrated three-dimensional nano-porous composite network. The positive electrode protective material has physical and chemical dual-adsorption effect and can constrain lithium polysulfide to nearby the positive electrode, thus effectively inhibiting loss of a positive active material in the lithium sulfur battery. Meanwhile, the material can accelerate conversion from soluble lithium polysulfide to indissolvable Li2S2 or Li2S, thus greatly improving energy conversion efficiency and rate capability of the lithium sulfur battery and achieving excellent cycle performance under high energy density. The invention also provides a practical application of the positive electrode protective material in the lithium sulfur battery.

The invention discloses a method for preparing magnesium alloy super-hydrophobic surface. The method comprises: cleaning the magnesium alloy after conventional pretreatment, adopting the micro-arc oxidation technique to form a roughening micro/nano porous surface on the surface of a sample in a phosphate electrolyte, treating the surface in an acrylic acid solution, performing spin coating of ethylene dimethyl silicone polymer on the surface, and drying the processed sample to prepare the magnesium alloy super-hydrophobic surface.