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.

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 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 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 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.