109results about How to "Small pore size" patented technology

A method for extracting nucleic acid from a fluid sample comprises the steps of introducing the sample into a cartridge having a sample flow path and a lysing chamber in the sample flow path. The lysing chamber contains at least one filter for separating cells or viruses from the sample. The sample is forced to flow through the lysing chamber to capture the cells or viruses with the filter, while used sample fluid flows to waste. The captured cells or viruses are disrupted to release their nucleic acid, the nucleic acid is eluted from the lysing chamber, and optionally the nucleic acid is amplified and detected in a reaction chamber of the cartridge.

A grafting reagent and related method of using the reagent to form a polymeric layer on a support surface, and particularly a porous support surface, in a manner that provides and/or preserves desired properties (such as porosity) of the surface. The reagent and method can be used to provide a thin, conformable, uniform, uncrosslinked coating having desired properties onto the surface of a preformed, and particularly a porous, polymeric substrate. The method includes the steps of a) providing a porous support surface, b) providing a nonpolymeric grafting reagent comprising a photoinitator group, c) providing one or more polymerizable monomers adapted to be contacted with the surface, in the presence of the grafting reagent, and to be polymerized upon activation of the photoinitiator; and d) applying the grafting reagent and monomer(s) to the surface in a manner, and under conditions, suitable to coat the surface with the grafting reagent and to cause the polymerization of monomers to the surface upon activation of the grafting reagent.

The invention discloses a compound filter material, a method and application thereof, and relates to a filter material. The invention provides a compound filter material which has good folding endurance, corrosion resistance and wear resistance and can be used as a high-temperature environment filter material, a method and application thereof. The compound filter material comprises the following components in percentage by mass: 1 to 99 percent of basalt fiber and 1 to 99 percent of polytetrafluoroethylene fiber. The preparation method comprises the following steps of: mixing the basalt fiber and the polytetrafluoroethylene fiber to obtain a mixed fiber; and adding an antistatic agent to the mixed fiber for mixing to obtain the compound filter material. According to the mass percentage, the adding amount of the antistatic agent is 0.1 to 20 percent of the mixed fiber. The compound filter material can be used for directly preparing composite filter cloth with single-layer structure or multi-layer structure, and the prepared composite filter cloth with single-layer structure or multi-layer structure can be used for producing a filter device.

The invention relates to an alumina light-weight brick and a preparation method thereof. The method adopts the technical scheme that: 50 to 80 weight percent of Al2O3 fine powder, 15 to 30 weight percent of alpha-Al2O3 micro-powder and 5 to 20 weight percent of rho-Al2O3 micro-powder serving as raw materials are mixed with 0.1 to 1 weight percent of sintering aid, 30 to 50 weight percent of water, 0.1 to 1 weight percent of water reducer and 0.1 to 2 weight percent of SiO2 for 3 to 5 minutes; furthermore, the mixture and 0.2 to 0.4 weight percent of foaming agent are mixed uniformly, and are cast and molded; and the mold is sintered at the temperature of between 1,450 and 1,700 DEG C after being dried, and is insulated for 3 to 5 hours. The method has the characteristics of simple process and energy conservation; and the prepared alumina light-weight brick has the volume density of between 0.6 and 1.1g/cm3, the heat conductivity of between 0.2 and 0.6w/(m.k) and the compression strength of 5 to 15Mpa, and has the advantages of higher strength, small volume density and low heat conductivity compared with hollow ball products.

A method for preparing functionalized porous particles is disclosed, the method comprising contacting a plurality of porous silica particles with water, at least one of an ionic fluoride such as HF or NH₄F or a basic activator, and a multifunctional organosilane. Also disclosed are functionalized porous silica particles produced from the methods disclosed herein.

The invention discloses a high-temperature-resisting wet-process felt and a preparation method thereof. The porosity of the high-temperature-resisting wet-process felt is more than 93% and the thickness of the high-temperature-resisting wet-process felt is 6mm-22mm; a nano silicon dioxide coating is arranged on the outer surface of the high-temperature-resisting wet-process felt; the diameter of fiber monofilaments of the high-temperature-resisting wet-process felt is 0.1 micron-2 microns, and closed vacuum balls with the diameter being less than 20nm are uniformly arranged on the outer surfaces of the fiber monofilaments. By the aid of the high-temperature-resisting wet-process felt, the porosity of a fiber cotton felt is greatly improved and the heat conductivity coefficient of the fiber cotton felt is reduced; any binding agent is not added into the product so that the product has the advantages of no toxin, high temperature resistance, low moisture absorption rate, soft texture and small volume density, and can be repeatedly used at high and low temperatures, and the heat insulation performance is not obviously reduced when the product is used at the high temperature; the highest utilization temperature is up to 1000 DEG C; the high-temperature-resisting wet-process felt can be widely applied to fire prevention and heat insulation of high-temperature equipment and is particularly suitable for heat preservation and heat insulation of equipment which needs to be usually converted between high temperature and low temperature.

The invention discloses a preparation method for a straw hydrogel composite material special for sewage treatment of metal ion adsorption. A hydrogel comprises the following components in parts by weight: 86 to 92 parts of polyvinyl alcohol, 0.5 to 4.0 parts of bentonite, 1.5 to 8 parts of straw and 1.0 to 2.0 parts of boric acid. Straw cellulosic fibers are adopted and added in the form of micro/nano fibrils; a nano cellulose hydrogel is an intelligent hydrogel, is a porous material, is small in pore diameter, is endowed with high water retaining capacity by the porosity, is a multifunctional adsorption material, has the characteristics of rapidness, high efficiency, high adsorption capacity and high selectivity, and has a remarkable effect on adsorbing heavy metal ions; meanwhile, the preparation process is simple, the cost is low and the operability is high, so that the hydrogel has a good application prospect in the field of sewage treatment.

The invention relates to nanometer high-weatherability colorful eco-friendly paint. The nanometer high-weatherability colorful eco-friendly paint comprises a pigment component, a disperse medium and varnish. The pigment component comprises RO water cellulose, an emulsion, a dispersant, pigment and filling materials, a nanometer anti-aging agent, an antifoaming agent, a nanometer stain-resistant agent, a film forming auxiliary agent, an antifreezing agent, an inorganic protection glue solution, a pH adjustment agent, a bactericide and a first thickening agent. The disperse medium comprises RO water, a film forming auxiliary agent, a rheological agent, an emulsion, an organic protection glue solution, an antifoaming agent, an inorganic protection glue solution and a coupling agent. The varnish comprises RO water, an emulsion, a nanometer anti-aging agent, a pH adjustment agent, a bactericide, an antifoaming agent, a film forming auxiliary agent, an antifreezing agent and 0.3-1 part of a second thickening agent. Compared with the prior art, the preparation method utilizes the nanometer stain-resistant agent to reduce air organic dust adsorption, realize good coating film self-cleanliness and improve paint stain resistance and utilizes the nanometer anti-aging assistant to improve aging resistance of the aqueous colorful paint.

The invention provides a preparation method of transparent magnesia-alumina spinel ceramic MgO.nAl2O3, wherein n is larger than or equal to 1 and smaller than or equal to 2. The method specifically comprises the steps as follows: 1) MgO powder and alpha-Al2O3 are mixed and ball-milled, a solvent is removed, sieving is performed, and magnesia-alumina spinel powder is obtained after a high-temperature solid-phase reaction and sieving; 2) the magnesia-alumina spinel powder is placed in a graphite mold, the graphite mold is placed in spark plasma sintering equipment for forming and pre-sintering,and a pre-sintered body is obtained; 3) the pre-sintered body is placed in a muffle furnace to be sintered again, natural cooling is performed, and a pore-closed sintered body is obtained; 4) the pore-closed sintered body is subjected to hot isostatic pressing sintering treatment, a sintered sample is polished, and the transparent magnesia-alumina spinel ceramic is obtained. By means of the method, the sample composition can be controlled, high compactness can be obtained without addition of a sintering aid, large-scale industrial production can be performed through sintering in non-pressure air, and the production cost can be reduced.

The invention belongs to the technical field of inorganic functional material preparation, and particularly relates to a TiO2 hollow microsphere synthesizing technology by using gel spherulite as precursor. A hydrolyzing agent complexed tetra-n-butyl titanate is dispersed into a water solution of starch, and is subjected to hydrothermal treatment at 150 DEG C, the starch reacts with tetra-n-butyl titanate to form a gel sphere with a three-dimensional network structure; a hollow structure is formed in the gel sphere in the mineralizing and carbonizing processes due to volume shrinkage, and the carbon ingredient remained in the gel sphere is removed by a thermal treatment; and the substantial part of the hollow TiO2 microsphere is made of a porous material formed by nano-crystalline grains (8-10nm) and nano-scale passages. According to the synthesized TiO2 spheres, the specific surface area is 230m<2>/g, the porous volume is 0.34cm<3>/g, and the average pore diameter is 6.6nm. By adopting the synthesizing process, water is used as a dispersing medium, and starch participates in the reaction to form the gel spheres, and the process is environment-friendly.

An insulating (nonconductive) microporous polymeric battery separator comprised of a single layer of enmeshed microfibers and nanofibers is provided. Such a separator accords the ability to attune the porosity and pore size to any desired level through a single nonwoven fabric. Through a proper selection of materials as well as production processes, the resultant battery separator exhibits isotropic strengths, low shrinkage, high wettability levels, and pore sizes related directly to layer thickness. The overall production method is highly efficient and yields a combination of polymeric nanofibers within a polymeric microfiber matrix and/or onto such a substrate through high shear processing that is cost effective as well. The separator, a battery including such a separator, the method of manufacturing such a separator, and the method of utilizing such a separator within a battery device, are all encompassed within this invention.

The invention discloses a SiC nano-wire reinforced porous ceramic composite material and a preparation method thereof. The material has a bulk density of 0.5-1.8 g/cm<3> and a through-hole ratio of 50-80%, and is composed of porous ceramic, SiC nano-wires, an interface layer and a SiC matrix, the SiC nano-wires in situ grow in the porous ceramic, the surfaces of the SiC nano-wires and the porous ceramic are coated with the interface layer, and gaps of the porous ceramic and the SiC nano-wires are filled with the SiC matrix. The SiC nano-wires are used to reinforce a porous ceramic composite material, so the internal specific surface area of the porous ceramic is effectively improved, and the porous ceramic is structurally toughened and reinforced; and in-situ filling with the SiC matrix significantly improves the filtration performance and the high-temperature heat insulation performance of the porous ceramic composite material.

The invention discloses an efficient thermal insulation cellucotton felt and a production method thereof. According to the efficient thermal insulation cellucotton felt, the porosity is larger than 93%, the thickness is 5mm-20mm, the fiber monofilament diameter is smaller than or equal to 3mum, and closed vacuum balls that are smaller than 20nm in diameter are uniformly distributed on fiber monofilaments. According to the efficient thermal insulation cellucotton felt and the production method thereof, the porosity of the cellucotton felt is greatly improved, the thermal conductivity of the cellucotton felt is lowered, any binding agent is not added in the felt, the felt has the advantages that the felt is free of toxicity, resistant to high temperature, flexible in texture, small in volume density and reusable between high temperature and low temperature and the thermal insulating property is not remarkably reduced though the felt is used at the high temperature, the maximum using temperature can reach 1000 DEG C, and the felt can be widely applied to fire prevention and thermal insulation of high temperature devices and especially applied to heat preservation and thermal insulation of devices that are usually required to be switched between high and low temperatures.

The invention discloses an improved zirconium oxide fiber plate, which is characterized in that on the basis of the existing fiber plate preparation process, through the addition of inorganic bondingagents and infrared light-screening agents, the zirconium oxide fiber plate with high pressure-resistant intensity and low high-temperature heat conduction rate can be prepared, wherein the inorganicbonding agent is mainly basic silicon sol; the infrared light-screening agent is mainly rutile type titanium dioxide or potassium hexatitanate whiskers. The density of the prepared zirconium oxide fiber plate is 0.6 to 0.8 g/cm<3>; the room temperature pressure-resistant intensity is 3.0 to 5.0 MPa; when the thickness of the sample is 1 cm, in the stable state, the hot surface temperature is 1000DEG C; the cold surface temperature is 270 to 300 DEG C; the hot surface temperature is 1200 DEG C; the cold surface temperature is 310 to 330 DEG C.

Porous electrode includes current collection body and an electrode active material. The current collection body includes a base and multiple holes inside the base. One end of hole is open end and the other end is closed. Electrode active material is filled into multiple holes, which makes surface area of electrode increase so as to raise electric capacity of battery and performance current collection. Electrode active material ordered arrangement in holes is in favor of migration of lithium ion. In the invention, holes are in small size. Thus, filled electrode active material is not easy to escape from current collection body. The invention also discloses lithium secondary battery possessing porous electrode.

The invention relates to a porous forsterite and akermanite composite ceramic material and a preparation method of the porous forsterite and akermanite composite ceramic material. According to the technical scheme, 60-70 wt% of dolomite powder, 25-28 wt% of silica powder and 5-15 wt% of magnesite powder serve as raw materials and are mixed, pulp liquid waste 5-8 wt% of the raw materials is added, and the mixture is stirred to be even and is mechanically pressed and formed; then a formed green body is aired for 16-24 hours under the condition of 110 DEG C, the temperature is kept for 3-8 hours under the condition of 1300-1450 DEG C, and then the porous forsterite and akermanite composite ceramic material is obtained. The particle sizes of the dolomite powder, the silica powder and the magnesite powder are smaller than 88 micrometers, and the pressure of mechanical pressing and forming is 30-100 MPa. The porous forsterite and akermanite composite ceramic material has the advantages of being environmentally friendly, being composed of dual phases, and being controllable in phase composition, pore size and size. The prepared porous forsterite and akermanite composite ceramic material is high in apparent porosity, high in intensity and good in high temperature performance, and can be used in the working environment lower than 1400 DEG C as a heat preservation material.

A bypass filter cartridge is provided having a low efficiency filter element and a high efficiency filter element oriented in either parallel or series. The low efficiency filter element may comprise pleated filter sheet while the high efficiency filter element may include a tubular ring of depth media with considerable thickness or pleated media of varying types. The filter cartridge may be adapted and configured for use in specialized locomotive oil lubrication circuits with substantial benefit therein.

The invention discloses foam glass prepared from fly ash as well as a preparation method and application of the foam glass, and belongs to the technical field of foam glass preparation. Fly ash and glass powder are adopted as raw materials and mixed with a foaming agent, then a PVB alcoholic solution is added for granulation, and after molding, high-temperature foaming is conducted through two times of heating, so that the foam glass is obtained. Through two times of heating and heat preservation, part of dioxin can be effectively decomposed, and meanwhile, the formation amount of a high-temperature melt phase is promoted so as to effectively coat residual dioxin, high chlorine, high calcium and heavy metal components. According to the method, the high-temperature melt effectively coats the high chlorine, high calcium, heavy metal components and residual dioxin, the heavy metal elements are left to stand in water for a long time, leakage of the high calcium and high chlorine componentsis little, and harm of the components to the environment is avoided. The method is simple in process and suitable for large-scale production, the fly ash is adopted as the raw material, and the problem of environmental pollution is solved while the low-cost raw material is obtained.

The invention relates to a high-temperature-resistant salt-resistant water loss reducer and a preparation method thereof in the field of oil-gas well cementation. The high-temperature-resistant salt-resistant water loss reducer includes 100 parts by weight of water, 40-80 parts by weight of 2-acrylamido-2-methyl propanesulfonic acid, 30-70 parts by weight of N,N-dimethyl acrylamide, 1-30 parts byweight of 3-allyloxy-2-hydroxy-1-propanesulfonic acid, 1-20 parts by weight of acrylic acid, and 1-20 parts by weight of acrylonitrile. The high-temperature-resistant salt-resistant water loss reducercan be cooperatively used with other oil well cement additives under a condition of the temperature of up to 180 DEG C, has a wide range of temperature application and good salt resistance effect, does not affect the performance of cement slurry in saturated or semi-saturated brine, can be cooperatively used together with matched dispersants, medium-temperature retarders and high temperature retarders and the like to prepare low water loss cement slurry meeting different well cementing requirements, and is suitable for API oil well cement at all levels.