444results about How to "Aperture adjustable" patented technology

The invention relates to an experimental device for simulating the spreading of a propping agent in a crack, which comprises an artificial crack, the artificial crack comprises two mutually-parallel transparent plates, the upper and lower ends of the two transparent plates are sealed respectively by an edge-coating frame, the left end of each transparent plate is provided with a simulated shaft, the right end of the transparent plate is provided with a liquid outlet pipe, and the transparent plates, the edge-coating frames, the walls of the simulated shafts and the walls of the liquid outlet pipes define a closed space. According to the invention, under the condition of taking different crack widths, crack surface coefficients, sand expansion ratios, fracturing-fluid leak-off levels, friction resistances in cracks and the like into consideration, the experimental device simulates the spreading situation of a propping agent in the artificial crack, therefore, the experimental device accurately simulates the situations of cracks in stratums, and the accuracy is greatly improved.

The invention discloses a preparation method of high-temperature-resistant aerogel. The method comprises: adding high-temperature-resistant powder or crystal whiskers to sol, performing in-situ compounding of sol and high-temperature-resistant powder or crystal whiskers, and performing aging, modification and drying to obtain high-temperature-resistant aerogel. The invention further discloses a preparation method of aerogel-type porous ceramics. Porous ceramics having an aerogel hole structure kept is obtained by sintering the high-temperature-resistant aerogel. The prepared high-temperature-resistant aerogel and aerogel-type porous ceramics can resist high temperature of 1000-1800 DEC C or more, keep the nanometer hole structure from collapse, have high porosity and strength and have hole diameters which can be adjusted from micropores to large holes. The aerogel and aerogel-type porous ceramics can be used as a super thermal insulation material and can be widely applied to fields of purification separation, adsorption, chemical industrial catalytic carriers, sound absorption and damping, sensing elements and electrochemistry. The method is simple and easy to carry out and suitable for massive production, and allows high temperature resistance of aerogel to be improved and application fields of aerogel to be broadened.

The invention discloses a hollow mesoporous silica microsphere with hollow core and adjustable mesopore and penetrating through a shell, preparation method and application thereof. The hollow mesoporous silica microsphere is obtained by the following steps: under the condition of acid or alkaline solution, taking hexadecyl trimethyl ammonium bromide or PEO-PPO-PEO triblock copolymer as template, adding non-polar solvent, stirring at a certain temperature, emulsifying, then adding silica source, after hydrolysis and condensation, filtering, drying, and roasting to remove the template. The preparation method has simple technique and short time, easy operation and low cost, the prepared microsphere comprises both macropore and mesopore structures, the mesopore penetrates through the shell, the aperture thereof is larger than 5nm and is adjustable within the range of 5-20nm, and by relatively large mesopore channel, internal and external transmissions of large guest molecules can be realized. The microsphere can be used as drug carrier, the drug loading amount can exceed 50% (mass percentage), and the drug release can be controlled by adjusting aperture of the mesopore and dissolutionrate of indissolvable drug can be improved.

The invention discloses collagen sponge and a preparation method thereof. The collagen sponge does not contain a chemical cross-linking agent, has the porosity of over 90 percent, and is prepared by performing radiation cross-linking on aqueous solution of collagen and then freeze-drying the aqueous solution of collagen; and sterilization is performed during cross-linking so that the biosafety problem caused during preparation is solved. The collagen sponge prepared by the method has no residue of chemical reagents, better biocompatibility and structural uniformity, and adjustable degradation rate and mechanical strength, and can be used as biomedical materials such as dressing, tissue engineering stents, artificial tissue components, tissue fillers, embolic agents and the like.

The invention is the improvement on a longitudinal drainage plate for silt consolidation, filter cloth and a drainage plate core, which is characterized in that fibrous hot-pressed microporous filter cloth is planar filter cloth hot-rolled by a flat roller, the filter cloth is adhered to the surfaces of convex ribs of the drainage plate core through thermal thawing or a chemical way, the filter cloth adopts silk reeling and hot-press forming separation technology, and the drainage plate core is made of co-polypropylene, thereby overcoming the disadvantages of the prior art; and the aperture of the filter cloth can be adjusted according to treated silt, the drainage plate is difficult to block, the engineering on a soft foundation after the treatment cannot have the settlement after the construction and has smooth drainage and high drainage efficiency, and the plate core has long effective service life.

Noise reduction is an important feature in consumer television. This is realized by spatial, temporal or spatio-temporal filters. Spatial filters require pixels from within one image, while temporal filters require samples from two or more successive images. The spatio-temporal filter unit (100) integrates spatial and implicit motion-compensated temporal noise reduction in one filter. For the motion compensation, no motion vectors are required. The spatio-temporal filter unit (100) is provided with a sigma filter (112) having one filter kernel (107) designed to operate on the pixels from both a current image and from the output of the spatio-temporal filter unit, being a temporally recursive filtered image. The operation of the spatio-temporal filter unit (100) can be adjusted by varying the thresholds of the sigma filter (112) and the selection of pixels. The adjustments can be controlled by a motion estimator (222), a motion detector (224) and a noise estimator (220).

The invention provides a method for preparing isotropic superelastic graphene gasgel. The method comprises the following steps: firstly, stirring and mixing an oxidized graphene aqueous dispersion, a reducing agent and sodium dodecyl sulfate (SDS) at low speed, and then stirring at high speed; heating, freezing, melting at room temperature, washing with ethanol and drying at atmospheric pressure to obtain the isotropic superelastic graphene aerogel. The method provided by the invention has the advantages of simple process and is suitable for industrial production, and the obtained graphene aerogel is isotropic, has uniform cell size, and has excellent compression recovery and good electrochemical performance.

The invention provides a method for preparing a nitrogen doped porous carbon material by using biologic proteins. The method mainly comprises the following steps: 1, mixing the biologic proteins with an acid or alkali or salt solution; 2, carbonizing the above obtained dried mixture under the protection of inert gas; and 3, carrying out distilled water addition, pumping filtration and washing until the pH value is 6.4-7, and drying to obtain solid powder which is the nitrogen doped porous carbon material. The widely and easily available biologic proteins are adopted as raw materials, and the raw materials comprise silk fibroin, albumen and soybean proteins, so the method has the advantages of simple operating technology, convenient control, cleanness, environmental protection, and easy industrial realization. The prepared nitrogen doped porous carbon material has the advantages of large specific surface area, low ash content and good conductivity. The nitrogen doped porous carbon material can be used in lithium ion batteries, lithium sulfur batteries, super capacitors and other electrode materials, and fields of carbon dioxide capture, hydrogen storage, catalyst carriers, active carbon adsorbents and biologic applications.

The invention discloses an environmental function nano-material-Cu2O / TiO2 nanotube array and a preparation method thereof. A TiO2 nanotube array is placed in 5mmol-20mmol of CuSO4 solution, and copper is electrodeposited on the TiO2 nanotube array in a standard three-electrode system by using pulse plating so as to obtain the Cu / TiO2 composite nanotube array; and after the deposition, the Cu / TiO2 composite nanotube array is electro-oxidized for certain time in an alkaline solution NaOH to obtain a TiO2 nanotube array modified by ultrafine Cu2O nanowires with the diameter of less than 5 nanometers. The nanaowires are intertwined and connected to from a network structure to be attached to the TiO2 nanotube array but do not fully block TiO2 nanotubes; the Cu2O / TiO2 nanotube array is very favorable for the transmission of photo-carriers, reduces the recombination probability of electron-hole pairs, effectively expands the absorption range of TiO2 in the visible region, reduces optical corrosion, improves photoelectric conversion efficiency, and shows good photocatalytic efficiency.

The invention provides a flyash geopolymer based porous material and a preparation process thereof. The porous material comprises the following components in parts by weight: 60-100 parts of flyash, 40-70 parts of alkali activator, 0-40 parts of admixtures, 0-5 parts of glass fibers, 2-8 parts of physical foaming agents and 0-0.8 part of chemical activators, wherein the alkali activator is alkaline mixed liquor containing various ions and comprises industrial water glass, sodium hydroxide, water, polyethylene glycol and sodium phosphate; the admixtures refer to levigated metakaolin, silicon micropowder and calcined coal gangue; the physical foaming agents include expired shampoo, an anionic surfactant sodium dodecyl sulfate (SDS), fatty alcohol polyoxyethylene ether sodium sulfate (AES) and disodium fatty alcohol polyoxyethylene ether monosulfosuccinate (AESS); the chemical foaming agents include aluminium powder, hydrogen peroxide, and the like. The porous material has adjustable volume density, fine and uniform pore diameter, low heat conductivity, high strength, the same life as buildings and good fireproof performance.

The invention relates to a nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and a preparation method thereof, and belongs to the technical field of electrocatalytic materials. Themethod is characterized in that a composite of a Zn-based bimetallic MOF and glucose is used as a precursor, the catalyst is obtained by high-temperature heat treatment and post-activation in ammoniagas, the monoatomic content is 2wt% to 4wt%, and the nitrogen doping amount is 4wt% to 15wt%. The addition of volatile Zn can increase the spatial distance of metal atomic nodes, the glucose can makea three-dimensional ZIF form a cross-linked structure, the structure and composition of a modulating material can improve the electrocatalytic activity, the nitrogen content can be further increased by post-activation treatment in the ammonia gas, and therefore, the electrochemical activity is improved. At the same time, the preparation method has the advantages of low cost, simple steps, mild conditions, good repeatability and easy mass production. The monoatomic catalyst exhibits good performance in an electrocatalytic oxygen reduction reaction (ORR) under an alkaline condition and has certain market application prospects.

The invention provides a preparation method of an orderly porous matrix shaping composite phase change material, and belongs to the field of a composite phase change material. The preparation method comprises the following steps: firstly preparing an orderly mesoporous silica carrier, and designing, adjusting and controlling the porous-channel structure, pore size and surface property of the carrier; secondly, using a phase change core material for preparing corresponding liquor, dispersing the prepared porous carrier in prepared phase change core material liquor, adsorbing the phase change core material by using the relatively strong capillary action, surface tension and the like of the porous carrier material so as to realize the high-efficiency filling of the core material in combination of the bonding effects of functional groups on the surface of the carrier on the core material, and drying so as to obtain the composite phase change material with relatively good heat storage capacity and relatively high stability. The composite phase change material has the advantages that the carrier is large in specific surface area, high in porosity and small in pore diameter, has orderly porous-channels and strong immobilization capacity on the phase change core material and is difficult to leak, the filling quantity of the core material is large, and the composite phase change material is high in energy storage density, good in heat stability, widely applied, difficult to burn, green and safe in use.

The invention provides a method for preparing a porous activated carbon material from rice bran. The method comprises the steps of 1, drying the rice bran until the moisture content of the rice bran is less than 14%; 2, carbonizing the dried rice bran under inert gas protection; 3, uniformly mixing the carbonized rice bran and an activating agent, and then activating under the inert gas protection; 4, adding distilled water, performing suction filtration, washing until the PH value is 6.5-7, and then drying to obtain solid power namely prepared porous activated carbon. The method provided by the invention uses the widely-available rice bran as a raw material, is simple in operation process, convenient in control, clean and environment-friendly, and easy in realization of industrialization. The prepared rice bran porous activated carbon is large in specific surface area, low in ash content and controllable in pore diameter distribution. The product can be applied to various fields of electrode materials such as lithium sulfur batteries, lithium ion batteries, super-capacitor and the like, hydrogen storage, carbon dioxide capture, activated carbon adsorbents, catalyst carriers, biology, sensors and the like.

The present invention belongs to the field of biomedical material technology, and is especially one kind of mesoporous biological glass fiber material with bone repairing bioactivity and its preparation process. The mesoporous biological glass fiber material is prepared through spraying sol in controlled viscosity by means of template of surfactant. It has controllable composition, has the main components of SiO2, CaO and P2O5 and may have also TiO2, MgO, etc. added. It has controllable mesoporous structure of pore size 1-30 nm, specific surface area 100-1000 sq m / g, pore volume 0.3-1.5 cu cm / g. It possesses controllable macroscopic fiber shape, excellent osteogenesis activity and cell activity, and excellent biocompatibility and degrading performance. Therefore, the mesoporous biological glass fiber material may be used as bone repairing filler material and rack material.

The invention relates to a graphene hollow nano fiber and a preparation method thereof. The external diameter of the graphene hollow nano fiber is 7-700nm, the internal diameter is 6-698nm, the length-diameter ratio is 20:1-2000:1, and the specific area is 300-2600 m<2> / g. The preparation method comprises the following steps: by using an inorganic fiber as a template, heating to 400-1000 DEG C in a carrier gas, introducing a carbon source, and decomposing at the same temperature to directly form the graphene hollow fiber or form a carbon-inorganic template composition fiber; and cooling the composition fiber, treating with acid or alkali, filtering, washing and drying. The preparation method is simple; and the product has the advantages of high purity, complete structure and high mechanical strength, and is suitable to be used as a separation or adsorbing material, an electrode material for electrochemical energy storage or a conducting agent.

The invention is a micro-flow control chip fluorescent detection optical device, comprising light source, filter plate, semitransparent semi-reflector, object lens group and photoelectric multiplier tube, and the structure of the detection optical device includes detecting light path, information collection interface and control interface. The invention is wide-application range, and flexible to adjust, the object lens group and the micro-channel of the micro-flow control chip automatically focus and the data processing is automatically completed by computer, quick and high-accuracy.

The invention relates to a water ride with adjustable nozzles for adjusting the speed and depth of the flow of water emanating from the nozzles and onto the ride surface. The nozzles have a bladder that can be used to adjust the height of the opening and therefore the depth of the water flow. More than one adjustable nozzle can be used to vary the flow effects across the width of the ride surface. Additional adjustment bladders can be provided underneath the inclined portion of the ride surface, wherein by adjusting each bladder independently, the tilt of the ride surface transverse to the direction of flow can be adjusted.

The invention discloses a preparation method of a high-strength nano-porous nickel film, and belongs to the technical field of a nano-porous metal film material, in particular discloses a method for preparing a high-strength nano-porous metal film material combining a micron-sized reinforcing framework and nano-sized pores through mixing alloy and metal powder, implementing powder metallurgy to obtain an alloy sheet, and further dealloying the sintered alloy sheet. The preparation method, through preparing a film precursor by powder metallurgy and selective corrosion in junction with dealloying, can increase the number of pores, and simultaneously keep high strength; aperture of the nano-porous metal film is adjustable from 0.5nm to 100nm when controlling various reaction conditions and parameters. The entire process, which is implemented in a stable environment, is safe, reliable, pollution-free, simple, low in cost and up to industrial demand, so that the prepared nano-porous metal film material is applicable to such aspects as biological medicine, organic synthesis, organic solvent micro and nano-filtration, catalysis and the like.

The invention relates to a method for preparing porous foam aluminum sheet. Wherein, it selects aluminum alloy to be heated via smelting furnace at constant temperature; selects food particle salt as foam porous stuff to be baked at high temperature and constant temperature; adds heated particle salt into mould, to be pressurized by compressor into block; adds melt aluminum to be pressurized by compressor, to make the melt aluminum into the space between particle salts, to form compact foam aluminum skeleton; then solidifies it to be extracted out from the mould to be cooled. The produced porous foam aluminum plate has uniform factor of porosity, with high porous rate, stable structure, adjustable thickness, improved quality, reduced producing cost and the application for batch production.

The invention relates to a hyaluronic acid modified polycaprolactone / polylactic acid three-dimensional porous composite scaffold and a preparation method thereof. The composite scaffold comprises the components of polycaprolactone PCL, polylactic acid PLA and hyaluronic acid HA. The preparation method comprises: (1) dissolving PCL and PLA into a cosolvent to derive transparent blend solution; (2) adjusting electrostatic spinning process, spinning the blend solution to a nanometer / submicron graded fibrofelt, and vacuumizing in a vacuum oven to remove residual solvents; (3) overlapping and filling the fibrofelt to a die of specific shape and placing in the vacuum oven, cooling, demoulding, modifying a plasma, and immersing in hyaluronic acid HA solution; (4) placing the HA modified composite scaffold in the vacuum oven to be dried, sterilizing with epoxy ethane and deriving the three-dimensional porous composite scaffold. The three-dimensional porous tissue engineering composite scaffold material of the invention has the advantages of uniform internal pore structure, stable architecture and simple preparation method, and can be used as the scaffold of bone and cartilage tissue engineering cell.

The invention discloses a composite zeolite membrane, and a preparation method and application thereof. The composite zeolite membrane comprises a support body layer and a zeolite membrane layer, wherein the support body layer is prepared from nanometer stage or submicron stage ceramic powder materials or ceramic material precursors through a static spinning process; the porosity of the support body layer is as high as 83 percent, and is adjustable and controllable between 40 percent and 83 percent. The composite zeolite membrane provided by the invention has the advantages that the porous ceramic prepared by the static spinning process is used as the support body layer; the surface structure of the support body layer is flat and continuous; the porosity is high; the pore diameter is uniform; the size of the pore diameter is adjustable and controllable; the pore passage sinuosity is small; the mechanical intensity is high; the flux of the composite zeolite membrane is improved; in addition, through the fiber-shaped pore passage structure of the support body layer, seed crystals can be effectively attached; the loading quantity of the seed crystals can be ensured; meanwhile, the matching degree and the compatibility between the zeolite membrane layer and the support body layer are greatly improved; the stability of the zeolite membrane layer is improved.

The invention discloses a method for quantitatively detecting telomerase activity based on a nano pore channel and electrochemical sensing.The method comprises the following steps that firstly, a telomerase recognition sequence is connected to the inner wall of a porous anodic alumina template or a polyethylene terephthalate film to serve as a primer; secondly, telomerase amplifies the primer to form a G-rich sequence; a G-quadruplex is formed in the presence of potassium ions; electrochemical detection is conducted on the current produced through indicating molecules of the nano pore channel by utilizing an electrochemical workstation.The method does not need complex material preparation and DNA probe marking, and can avoid the defects of high detection cost, complicated operation and poor reproducibility caused by the complex material preparation and DNA probe marking and has the advantages of being low in cost, quick, simple, convenient, high in sensitivity and good in accuracy.

The invention discloses a CuxSe / TiO2 nanotube array of a p-type semiconductor nano material and a preparation method thereof. The method comprises the following steps: putting a TiO2 nanotube array in 5mmol-20mmol of CuSO4 solution; electrodepositing elementary substance Cu on the TiO2 nanotube array by adopting pulse plating in a standard three-electrode system to obtain a Cu / TiO2 compound nanotube array; carrying out electrooxidation in an NaOH alkaline solution for a certain time after deposition is ended to obtain a superfine Cu2O nanowire-modifying TiO2 nanotube array; and then putting the Cu2O / TiO2 nanotube array in a selenium ion solution, and stirring for 30-60 min under light to obtain a copper selenide nanotube array. Based on the superfine Cu2O nanowire-modifying TiO2 nanotube array, the absorption range of TiO2 in a visible light area can be effectively expanded and the compounding probability of an electron hole pair can be reduced, and more photoelectrons and photoholes can be generated under visible light, thereby being more beneficial to Cu2O to react with the selenium ion solution to generate copper selenide. The CuxSe / TiO2 nano material with a novel structure has potential application in the aspects of solar batteries, solar radiation absorbers, nano switches, thermoelectric photoelectric converters, superconductors, air-sensitive sensors and the like.

The invention provides starch-based nitrogen doped mesoporous molding carbon. A preparation method of the carbon comprises the following steps: mixing natural starch with a template agent, adding water of a water absorption volume capacity equal to that of the mixture, uniformly stirring, performing extrusion modeling, leaving to stand for a time, and drying in an oven so as to obtain a mesoporous carbon precursor; putting the obtained mesoporous carbon precursor into a tubular furnace; in the presence of an inert gas, heating to 400-1000 DEG C, and roasting for 1-5 hours at a constant temperature so as to obtain a carbonized material; removing the template agent from the obtained carbonized material, washing till being neutral with deionized water, and drying, so as to obtain a finished product. The starch-based nitrogen doped mesoporous molding carbon provided by the invention is simple in preparation process, low in ash range and impurity content, free of extract nitrogen source, rich in pore, high in mesoporous structure ratio, adjustable in aperture and excellent in catalysis property in reaction for preparing vinyl chloride monomers by using a calcium carbide method, and can be used as a mercury-free catalyst or a catalyst carrier.

The invention provides graphene with a composite pore structure and a preparation method thereof. The lamellar structure of the graphene comprises micropores with pore diameters of 0.1-10nm and macropores with pore diameters of greater than 50nm. Semiconductor oxide nano particles are combined with graphene oxide; in the mixed dispersion liquid thereof, the conjugate microcells of the graphene oxide absorb photons to generate electrons and holes through an ultraviolet irradiation method, and the electrons and holes react with oxygen-containing groups of a non-conjugate area to generate macropores; and the semiconductor oxide nano particles absorb photons to generate electrons and holes, and the graphene oxide of the microcells in direct contact with the semiconductor oxide nano particles is oxidized to generate micropores. When serving as an electrode material, the graphene has a high specific surface area and also can enable electrolyte to enter a narrow space between the lamellas of the graphene to form an effective double layer so as to increase the effective specific surface area of the grapheme, thereby obtaining a device with a high specific capacitance value.

The invention discloses a composite film for a flow energy storage battery and an application of the composite film in the flow energy storage battery. The composite film disclosed herein is characterized by using one or more than two of organic polymer resin or sulfonated polymer resin as raw material to prepare a porous film as a matrix, and successively alternately self-assembling cationic polymer resin and anion polymer resin layer by layer on the surface of the matrix by static electricity to form the composite film. The composite film disclosed herein has the advantages of simple preparation method, environmentally friendly process, controllable number of assembling layers, and adjustable ionic selectivity. Compared with original porous films, the composite film disclosed herein has good hydrophilicity and vanadium ion blocking ability, and an all vanadium flow energy storage battery assembled by using the composite film has higher efficiency and longer self-discharge time.

The invention provides a preparation method of three-dimensional graphene. The method comprises the steps that a metal substrate is deposited on the surface of a metal wire mesh, and a wire mesh template is obtained; 2, graphene grows on the surface of the wire mesh template through chemical vapor deposition, and the wire mesh template on which graphene grows is obtained; 3, the wire mesh template on which graphene grows is etched through an acid solution, and three-dimensional graphene is obtained. Compared with the prior art, the metal wire mesh on which the metal substrate is deposited is used as the template which has the adjustable hole diameter and thickness, accordingly, the obtained three-dimensional graphene is small in hole diameter and uniform in distribution, and has stronger operability and has higher conductivity and heat conductivity, good mechanical performance and several-time higher volume density compared with graphene foam.

The invention relates to a method for preparing a PLGA / PCL / nHA composite bone repair porous scaffold by a 3D printing technology as well as a product and application of the method. The method comprises the following steps: mixing 1,4-dioxane which is used as a solvent with PLGA and PCL according to a mass ratio of 9:(1-5):5, adding nHA powder according to a mass fraction of 10-25%, and finally adding tributyl citrate as a compatibilizer to improve the uniformity of the material; using the solution as 3D printing 'ink', carrying out 3D printing with a 3D printer, selecting a 150-micron discharging needle, and setting printing parameters as follows: parallel printing is adopted for each layer with gaps of 0.1-0.3mm, the Z-axis direction is raised by 0.2mm each time, the layers are verticallycrossed and stacked, the extrusion speed is set to 1.5-2mm / s, and the temperature of a receiving platform is -20 to -10 DEG C; and after the scaffold is printed, carrying out freeze-drying for 48 hours, and then drying the scaffold in a vacuum oven at 50 DEG C for 24 hours or more to prepare a PLGA / PCL / nHA composite bone repair porous scaffold. The preparation method provided by the invention issimple and feasible; the prepared porous bone repair scaffold has proper pore size and porosity, good biocompatibility and mechanical strength, thereby providing a new idea for clinical treatment of large bone defects, and having a wide clinical application prospect.

The invention discloses a ternary nanocomposite Au / RGO-TiO2 nanotube array as well as a preparation method and application thereof. A graphene film and nano gold particles are modified on the surface of a titanium dioxide nanotube array; and the nano gold particles are also modified and distributed on the inner pipe wall and the outer pipe wall of the titanium dioxide nanotube array. By the ternary nanocomposite Au / RGO-TiO2 nanotube array as well as the preparation method and the application thereof, the adsorption capability and the electron conduction capability of the titanium dioxide nanotube array are further enhanced, the absorption range of a visible light zone is widened, and the photoelectric conversion efficiency is improved.