20 results about "Pore diameter" patented technology

The invention discloses a guided tissue regeneration membrane. The membrane adopts a double-layer membrane structure and is characterized in that one layer is a compact layer prepared from biological fibers with longer degradation time, and the other layer is a potential loose layer prepared through mixing of biological fibers with different degradation time. After the potentialloose layer is implanted in a body, part of the biological fibers degrades quickly, so that the pore diameter of the membrane is increased, and ingrowth of cells is facilitated. The compact layer and the potential loose layer are connected through the same biological fibers with the longer degradation time, so that the double-layer membrane is free of splitting and fractures. The invention further discloses a preparation method of the guided tissue regeneration membrane as well as an application of the guided tissue regeneration membrane as a tissue repair product to tissue repair.

Disclosed is a porous electrode comprising a porous film (A) with through pores and an electrically conducting material selected from the group consisting of conductor and semiconductor, the porous film (A) having an average pore size d1 of from 0.02 to 3 μm and a porosity of from 40 to 90%, the electrically conducting material being filled in the through pores of the porous film (A). A dye-sensitized solar cell and an electric double layer capacitor including the porous electrode as a constituent are also disclosed.

The invention discloses an industrially-applicable method for preparing a polymer foamed material by using supercritical fluid technology, which comprises the following steps: 1) forming a polymer raw material to be foamed into raw blanks by melting, blending and cooling; 2) placing the raw blanks in a container, charging supercritical fluid into the container, and allowing the raw blanks to swell and the supercritical fluid to permeate into the raw blanks; and 3) initiating nucleation and foaming by controlling pressure relief rate and obtaining the closed micro pore polymer foamed material with uniform pore diameter and adjustable pore density. According to the invention, the process is simple, the production process is clean and environment-friendly, the efficiency is high, and the prepared foamed material has high mechanical performance and can be used in fields of transportation vehicles, building materials, packages and the like.

The invention relates to a filter, which comprises a filter shell, wherein the upper part of the filter shell is provided with an air inlet pipe, and the lower part of the filter shell is provided with a blow-off pipe. The filter is characterized in that a filter core is arranged inside the filter shell and comprises an upper supporting plate and a lower supporting plate; a foldable annular filter screen is arranged between the upper supporting plate and the lower supporting plate; an air outlet pipe is arranged on the lower supporting plate; an air outlet end of the air outlet pipe is extended out of the filter shell; the foldable filter screen is arranged between the upper supporting plate and the lower supporting plate; and a filter layer of the filter screen is telescopic. When the filter layer is compressed by the upper supporting plate under pressure, the pore diameter of the filter layer is reduced and the density is increased, so that the filtration precision can be improved. Under the condition of reverse blowing from the air outlet pipe, the air pressure drives the upper supporting plate to restore to the original state; the filter screen is stretched; the filter layer of the filter screen is loosened; and the density of the filter layer is reduced, so that air can easily remove dust on the outer surface of the filter screen, thereby the filter is convenient to use.

A method for reducing the surface variance of a porous metal substrate. The method does not significantly reduce the bulk porosity. The method can be used to reduce the surface pore diameter. A membrane, can be deposited on the reduced variance surface to form a separation membrane.

The invention discloses a pump-probe method based on Z-scan. A laser beam is divided into two beams; pumping light is focused on samples to be measured through time delay, so that a non-linear sample generates nonlinear absorption and nonlinear refraction; emergent probe light is divided into two beams through a spectroscope, wherein one beam directly enters a first probe, and the other beam enters a second probe after passing through a diaphragm of small pore diameter with a center coinciding with an optic axis. The pump-probe method is characterized in that phase objects are arranged in the front of a convex lens in a probe light path; the method for measuring the light comprises the following steps: (1) the samples to be measured are put in place, and the energy of the probe light at different times is collected by two probes respectively; (2) a energy curve of the probe light at different delay times is processed, so as to obtain optical nonlinear parameters. A measuring system working according to the method has the advantages that the light path is simple; the data treatment is simple; nonlinear absorption and refraction can be measured simultaneously without the need of separate measurement, and the size and the symbol of the nonlinear refraction can be measured simultaneously; the measuring results are accurate, etc.

The invention discloses a sandy soil screening device for building construction. The device comprises a spiral feeding mechanism, a feeding pipe and a screening bin; in the operation process, a speedreducer and a motor on the spiral feeding mechanism are turned on, the speed reducer drives a rotating shaft to rotate, a spiral feeding blade rotates to continuously pour an appropriate amount of sandy soil into a conveying cylinder through a feeding funnel, the sandy soil is conveyed to a discharging pipe to be moved out by rotating the spiral feeding blade, clamping rods are extruded, and second springs are compressed, so that the two ends of each clamping rod are moved out from the interior of a clamping groove; door plates are opened, the motor is turned off, the outer surfaces of the upper side walls of the door plates are placed on the side walls of discharging channels, the sandy soil in corresponding screening boxes flows out from the discharging channels through the surfaces of the door plates, and discharging is convenient; according to the sandy soil screening device, the screening efficiency is improved by continuously sliding the screening boxes, the screened soil is further screened by multiple layers of sieves different in pore diameter, the operation process saves time and labor, the working efficiency is improved, and the device runs stably, facilitates feeding and discharging and provides convenience for operation workers.

The invention relates to a non-metal honeycomb combustion plate for a Chinese food kitchen range. The non-metal honeycomb combustion plate is matched with a premixed combustor, is made by performing extrusion molding and baking on a high-temperature-resistant non-metal material, and has a honeycomb structure; through holes are uniformly distributed at small pore diameters and high density; the surface layer of a plate body is coated with chemical raw materials prepared through a special formula. When mixed gas in a premixed chamber passes through, the mixed gas is remixed to the maximum extent and is contacted with a coating layer on a large area, and the coating layer performs a complete combustion oxidation reaction on fuel gas, so that the mixing degree and heat efficiency of the fuel gas and combustion-boosting air are maximized, and the emission of harmful gas is minimized.

A catalyst used for synthesis of dimethyl oxalate from CO is disclosed, the catalyst comprises a carrier and a bimetallic nanoparticle, the carrier is crystalline form Al2O3, the specific surface area of the Al2O3 is 20-200m<2> / g, the pore volume is 0 .5-1.5m<2> / g, the pore diameter is 3-20 nm, the bimetallic nanoparticle is an active component formed by combination of metal lead and a metal M, and the M is any metal element of Fe, Ni, Co and Mn. Advantages of the catalyst for synthesis of dimethyl oxalate from CO are as follows: by use of the previously-synthesized Pd and M bimetallic nanoparticle and relatively high specific surface area of theta-Al2O3, dispersion of the Pd and M on the carrier is improved, the space time yield and selectivity of the catalyst are improved, the synthesis efficiency is improved, the catalyst is low in use requirements, can be used at low temperature, reduces production energy consumption, and saves production costs, the preparation process of the catalyst is simple, preparation is convenient, and the finished catalyst is easy to use, and worthy of promoting.

The invention relates to a slag-corrosion-resistant lightweight alumina clinker and a preparation method thereof. According to a technical scheme in the invention, the preparation method comprises thefollowing steps: with 89-97 wt% of raw alumina micropowder, 1-9 wt% of carbon black and 0.1-4 wt% of plant ash as raw materials, uniformly mixing the raw materials in a planetary ball mill, and carrying out mechanical pressing under the condition of a pressure of 100-200 MPa to obtain a green body; and drying the green body at 110-200 DEG C for 12-36 hours, and carrying out heat preservation at 1550-1750 DEG C under a carbon burying condition for 3-8 hours to obtain the slag-corrosion-resistant lightweight alumina clinker. The method is low in cost and simple in process, and the prepared slag-corrosion-resistant light-weight alumina clinker has the characteristics of small pore diameter, high strength and strong slag resistance.

The invention provides a preparation method of a porous high-load electrode for a lithium-sulfur battery. The preparation method comprises the following steps: 1) preparing an electrode manufacturing material into a sulfur-carbon film layer by using a rolling process, wherein the electrode manufacturing material comprises a sulfur-carbon mixture containing sublimed sulfur, a conductive agent and NH4HCO3; and 2) placing an aluminum net between two sulfur-carbon film layers, and rolling and laminating to prepare a high-load electrode; and then removing NH4HCO3 in the sulfur-carbon film layers through hot drying treatment, and forming an ion channel in the high-load electrode to obtain the porous high-load electrode. The pore-forming agent NH4HCO3 is introduced in the preparation process of the high-load electrode, the ion channel with a proper pore diameter is reserved in the high-load electrode by utilizing a gasification reaction of thermal decomposition of the pore-forming agent NH4HCO3, the ion channel plays an important role in improving the wettability of an electrolyte and improving the ion transmission efficiency in a battery reaction, and the overall energy density of the lithium-sulfur battery can be improved by 2-3 times.