110 results about "Porous membrane" patented technology

This porous membrane 1 contains a fluorine-free resin as a main component, and has a first surface 1a in which a plurality of holes are present and a second surface 1b on the opposite side from the first surface 1a. The arithmetic mean height Sa1 of the first surface 1a is 0.2 μm or greater. This method for producing a porous membrane 1 comprises, in the following order, a step for applying a solution that contains a fluorine-free resin and a solvent to a first surface 5a of a base material 5 to form a coating film, a step for immersing the coating film in water, a step for drying the coating film, and a step for detaching the coating film from the base material 5. The arithmetic mean height Sa3 of the first surface 5a of the base material 5 is 0.42 μm or greater.

A microporous separator for a lithium battery. The microporous separator is a polyolefin porous membrane. In the microporous separator, the molar percentage of polyolefin chain segment components having a weight-average molecular weight of not more than 100,000 is 15-30 mol%; and the microporous separator has a first heating crystallinity of greater than or equal to 60%, and a second heating crystallinity of less than or equal to 45%.

When a conventional porous membrane is used for a contaminative liquid to be filtered, the surface of the membrane is blocked due to turbid matter separated by filtration and, as a result, membrane clogging occurs, so that the permeation performance tends to deteriorate. Provided is a porous membrane that has high water permeability and excellent contamination resistance, and is capable of maintaining high filtrate permeability for a contaminative liquid to be filtered. The porous membrane contains a polyvinylidene fluoride resin, in which, given that one surface is a surface A and another surface is a surface B, a ratio (ratio of Hα / Hβ) between an α-type crystal (Hα) and a β-type crystal (Hβ) in a crystalline portion of the polyvinylidene fluoride resin measured by an attenuated total reflection (ATR) method at the surface A is 0 or more and 0.5 or less, a pure water permeability is 0.25 to 1.2 m3 / m2 / h / 50 kPa, and an average value of a surface pore diameter of a surface pore of the surface A of the porous membrane is 5.0 nm or more and 12.0 nm or less.

The application provides a device for preparing a composite nanofiber porous membrane, and relates to the technical field of nanofiber membranes. The device for preparing a composite nanofiber porous membrane comprises a stirring mechanism, a membrane preparation mechanism, a filtering mechanism and a plurality of quantitative mechanisms, and each mechanism cooperates to complete an integrated operation of material conveying, mixing, membrane preparation and waste gas treatment. The stirring mechanism is a sealed cavity structure, an internal stirring module for stirring and mixing materials is arranged in the stirring mechanism, one side of the stirring mechanism is fixedly connected with the membrane preparation mechanism through a conveying pipeline, the uniformly stirred materials can be stably pumped into the membrane preparation mechanism, and a waste gas pipe is communicated with the stirring mechanism through an air pump close to the upper end position in the stirring mechanism. The device has the advantages of precise quantitative conveying of raw materials, efficient mixing of materials, recycling of waste gas after purification, high automation degree of membrane preparation and discharging, integrated and cooperative operation of each module, and improved production efficiency and product qualification rate.

The application provides a glycyrrhetinic acid composition with redness-reducing and anti-inflammatory functions, and a preparation method and application thereof, and belongs to the technical field of cosmetics. Glycyrrhiza is subjected to enzymolysis, supercritical fluid extraction, and precipitation to obtain glycyrrhetinic acid, the glycyrrhetinic acid is coupled with allantoin to obtain a glycyrrhetinic acid-allantoin conjugate, the glycyrrhetinic acid is reacted with menthol to obtain glycyrrhetinic acid menthol ester, the glycyrrhetinic acid-allantoin conjugate, phospholipid and cholesterol are added into ethanol for dissolution, ethanol is removed by rotary evaporation under reduced pressure, a transparent film is obtained, an ethanol solution is added, ultrasonic treatment is carried out, and micro-porous membrane filtration is carried out to obtain the glycyrrhetinic acid composition with the redness-reducing and anti-inflammatory functions. The glycyrrhetinic acid composition with the redness-reducing and anti-inflammatory functions has the effects of redness reduction, anti-allergy, inflammation reduction, antibiosis, soothing, moisturizing and the like, effectively improves the transdermal penetration capacity of active ingredients, improves the water-solubility, greatly improves the bioavailability of the product, and thus expands the application range.

An improved discontinuous aqueous adhesive coating is disclosed that contains large polymer particles or agglomerates having an average particle size (D50) greater than 5 microns. The coating can be applied to one or both sides of a porous membrane. The method of forming the coating involves applying an aqueous slurry containing large polymer particles having a D50 greater than 5 microns to a porous membrane. The method of application can be a spray method.

This invention discloses a high-strength, hydrophilic PVDF hollow fiber porous membrane with a through-cell honeycomb structure and its preparation method, belonging to the field of membrane separation technology. The technical solution includes: a) preparing a homogeneous spinning solution composed of a fluoropolymer and a diluent; b) simultaneously extruding the spinning solution and core solution through a spinning device, and then introducing the extruded nascent hollow fiber membrane containing the core solution into an external coagulation bath system to complete phase separation, solidification, and stretching; the core solution and / or the external coagulation bath system in step b is a solution containing a hydrophilic agent. This invention proposes a simple, controllable, and effective method to achieve uniform, durable, and non-damaging hydrophilic modification of the inner and outer surfaces of the fiber while preserving the excellent mechanical properties of the PVDF bulk.

A method for creating oil-filled porous anodic oxide coatings for stainless steel is disclosed. The coating has anti-corrosion and omniphobic properties to resist both atmospheric conditions, or other conditions with exposure to vapor, and wet conditions, in which the coating is exposed to and / or immersed in liquid. The anodic oxide coating of the present invention can be made by the steps of cleaning and / or electropolishing a steel substrate, applying anodic oxidation to the steel substrate, washing the steel substrate in an organic solvent, and annealing the substrate at high temperature. To fill the porous coating with an oil, a solvent exchange method may be applied.

To provide a CO2 separation laminate with excellent CO2 permeability and high strength, a film roll in which the CO2 separation laminate is wound into a roll shape, and a CO2 separation method using the CO2 separation laminate. [Solution] A CO2 separation laminate having a CO2 separation laminate body, wherein the CO2 separation laminate body consists of a CO2 separation membrane and a support membrane, or consists of a CO2 separation membrane, a support membrane and a first adhesive layer that is permeable, and in the CO2 separation laminate body, the CO2 separation membrane and the support membrane are laminated via the first adhesive layer or directly, the CO2 separation membrane is a membrane made of a polymer having a siloxane skeleton, the thickness of the CO2 separation membrane is 1 μm or less, the support membrane is a porous membrane made of a thermoplastic resin, the average pore diameter of the support membrane is 400 nm or less, and the thickness of the CO2 separation laminate is 20 μm or more and 450 μm or less.

To provide a method for culturing avian embryos outside the eggshell that can reliably achieve high embryo survival rates and low embryonic developmental abnormality rates, and that is relatively easy to perform, as well as a method for evaluating the toxicity of test substances using such a culture method. [Solution] The embryo and yolk are removed from the fertilized bird egg and transferred together with avian aqueous oocyte white into a roughly cylindrical well in a culture vessel. The opening of the well, which is filled with avian aqueous oocyte white, is then covered with a porous membrane, and the avian embryo is cultured by turning it over. Preferably, the cultured avian embryo is further cultured in a roughly cylindrical well in which a porous membrane is provided along the inner circumference, and the amount of avian aqueous oocyte white is adjusted so that there is a space between the well and the avian yolk below the opening.

A biological sterilization indicator (BI) is provided. The BI can include a housing and a container disposed in the housing. The BI can also include a first chamber and a second chamber having a source of biological activity disposed therein. The BI can also include a substrate disposed in the housing between the first chamber and the second chamber. The substrate can be disposed in fluid communication with the first chamber and the second chamber, and the substrate can also be disposed such that the substrate does not directly contact the source of biological activity. The substrate can include a hydrophobic non-porous membrane having an orifice. The substrate and the orifice can be sized to control fluid flow between the first compartment and the second compartment. The substrate can extend substantially around an entire inner perimeter of the housing between the first compartment and the second compartment.

The application relates to the technical field of reverse osmosis membranes, in particular to a high-performance reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane is prepared by the method. The method comprises the following steps: growing a cuprous oxide nanoparticle layer on a polysulfone porous membrane layer in situ, so as to obtain a first combined membrane piece; growing a polyacrylamide layer on the cuprous oxide nanoparticle layer in the first combined membrane piece, so as to obtain a second combined membrane piece; and growing a polyamide layer on the polyacrylamide layer in the second combined membrane piece, so as to obtain a high-performance reverse osmosis membrane. The high-performance reverse osmosis membrane prepared by the application has high water flux and high desalination rate, and the high water flux and the high desalination rate are stable.

The application provides a preparation method of a graphene porous membrane. Through process improvement and control of different process parameters, a porous graphene oxide is formed by hole etching on a raw material graphene oxide cake, and then the porous graphene oxide is pulped and coated to form a membrane to form a nanopore surface. After chemical reduction and foaming, exhaust passages are formed on the surface and the edge, the problem of bulging and delamination caused by untimely exhaust during industrial production is solved, and the interlayer bonding force is improved.

Polymer compositions are disclosed containing at least one high molecular weight polyethylene polymer for producing gel extruded articles. In one embodiment, porous membranes are produced that have an excellent balance of properties including high porosity and high strength characteristics. In one aspect, very thin membranes can be formed having high strength characteristics.

This invention discloses a pressure- and collapse-resistant porous nano-mass transfer membrane and its preparation method, belonging to the field of membrane separation technology. The mass transfer membrane comprises a macroscopically rigid substrate layer, a thermosetting polyimide mesoporous support layer formed by crosslinking with aliphatic diamines, and a highly crosslinked polyurea ultrathin active layer formed by the in-situ reaction of diisocyanate and diamine. The preparation method mainly involves forming a polyimide porous membrane on the substrate layer through phase inversion, followed by in-situ crosslinking to construct the support layer, and finally forming the active layer on the surface of the support layer using electro-spraying technology. This composite membrane structure significantly improves overall rigidity and compressive strength, maintaining excellent permeate flux, high desalination rate, and stable pore structure under harsh conditions of ≥250 bar high pressure, high salt, and high temperature for extended periods, making it suitable for high-pressure separation processes such as seawater desalination and high-salt wastewater treatment.

A method of manufacturing a fluidic cartridge includes providing a cartridge body with a sample chamber having an open first end and a sample exit port at a second end and one or more chambers that are that are fluidly connected or connectable with the sample chamber. First and second porous membranes are provided and the second membrane is affixed within the sample chamber covering the sample exit port. Non-magnetic beads and at least one magnetic element are introduced into the sample chamber. The first membrane is then affixed within the sample chamber, overlapping the open first end of the sample chamber. An internal wall of the sample chamber and the affixed first and second membranes define a lysis chamber. Pores of the first and second membranes are sized to retain the non-magnetic beads and the magnetic element within the lysis chamber.

This invention relates to an asymmetric polypyrrole nanopillar array thin film, its preparation method, and its application in gas sensors. The method includes the following steps: immersing a flexible, biodegradable porous filter membrane in a polymerization catalyst solution; adding a pyrrole dispersion dropwise to the polymerization catalyst solution with the porous filter membrane immersed in it, followed by freezing and static reaction; removing the reacted porous filter membrane, washing, and drying it; performing surface treatment on one side of the dried porous filter membrane; placing the surface-treated porous filter membrane in a solvent to remove the porous membrane, and then washing and drying it to obtain the asymmetric polypyrrole nanopillar array thin film, which is used to construct a gas sensor. Compared with existing technologies, the preparation method of this invention mainly involves impregnation and dropwise addition. Through simple dip-coating and oxygen plasma surface treatment steps, the asymmetric polypyrrole nanopillar array thin film is prepared without the need for prolonged ultrasonication, simplifying the process.

The application discloses a method for preparing a super-hydrophilic porous membrane by grafting SiO2 on a polyurethane fiber membrane, and comprises the following steps: preparing a N,N-dimethylformamide / butyl acetate DMF / BuAc solution of polyurethane PU to obtain PU spinning solution; the PU spinning solution is used to prepare a micron porous membrane through an electrostatic spinning device; the porous membrane is placed in a plasma treatment device, a radio frequency source is turned on, and radio frequency power and time are set; a higher chemical activity plasma is used to activate the surface of the porous membrane fiber to form grafted active groups; the surface-activated porous membrane is placed in a mixed solution of ethanol and amino silane for ultrasonic treatment; the porous membrane treated by the amino silane is placed in a mixed solution of ethanol, water and tetraethyl orthosilicate for ultrasonic treatment to obtain a super-hydrophilic porous membrane. The super-hydrophilic porous membrane prepared by the method has excellent comprehensive properties such as moisture absorption, quick drying, oil-repellence under water and oil stain resistance.

The application provides a composite polymer solid electrolyte membrane and a preparation method and application thereof, wherein lithium salt, a cyclic ether compound and a non-ether polymer soluble in or insoluble in the cyclic ether compound are mixed, a polymerizable system is uniformly coated on one side or both sides of a porous membrane through a method such as drop coating, blade coating, spray coating, gravure coating and the like, the non-ether polymer soluble in or insoluble in the cyclic ether compound in the mixture is intercepted on one side of the porous membrane, part of the lithium salt and the cyclic ether compound penetrate into the inside of the porous membrane and the other side under the action of gravity and capillary force, and a polymer electrolyte layer different from the inside of the porous membrane is formed on both sides of the porous membrane through ring-opening polymerization, so that the composite polymer solid electrolyte membrane is obtained.

The porous membrane laminate of the present application has a support layer having porosity and a porous membrane laminated on one side of the support layer and having polytetrafluoroethylene as a main component, the porous membrane being a uniaxially stretched material, the average pore diameter of the porous membrane being 25 nm or more and 35 nm or less, the maximum pore diameter of the porous membrane being 49 nm or less, and the average thickness of the porous membrane being 0.6 μm or more and 3.5 μm or less.

The application discloses a kind of high-flux, high selective screening UiO-66-based composite nanofiltration membrane and preparation method thereof.The UiO-66-based composite nanofiltration membrane includes substrate layer-UiO-66-based MOF transition layer-polyamide skin layer from bottom to top in sequence;The UiO-66-based MOF transition layer is coated on the surface of the substrate layer by in-situ growth, activation;The polyamide skin layer is generated on the surface of UiO-66-based MOF transition layer;Its preparation steps include: S1.washing and drying of substrate layer;S2.preparation of precursor solution;S3.in-situ growth of UiO-66 on substrate layer;S4.activation;S5.forming polyamide skin layer on the surface of UiO-66-based MOF transition layer;The membrane can be used in domestic water purification, industrial wastewater recovery, seawater desalination and the like.Under the synergistic effect of the three-layer structure of the membrane, the nanofiltration performance of flexible polymer porous membrane is significantly improved, with high flux and high selective screening, efficient water purification can be realized, and the preparation method provided by the application is low in cost, simple and easy to popularize.

The application provides a kind of encapsulated ultrasonic transducer and a kind of wet porous membrane extraction method, belong to lithium ion battery membrane preparation technical field.The encapsulated ultrasonic transducer provided by the application adopts stainless steel shell and flange to form airtight space, realizes the encapsulation of the outside of the rear end and front cover plate of half-wavelength sandwich type piezoelectric transducer, ensures that each ultrasonic transducer can independently act on extraction liquid, directly contacts and couples with extraction liquid through the setting of amplitude lever probe, the vibration transmission path is short, the energy utilization rate is higher, the sound field distribution is more uniform, and the cavitation effect is stronger.The amplitude lever probe can form a concentrated and stable excitation surface, can form a controllable strong ultrasonic field on the surface of the base film, avoid the problems of sound field blind area, local overheating or uneven cavitation easily occurred in the built-in ultrasonic transducer, and further improve the extraction efficiency of the membrane.

This invention discloses a method and system for measuring and calibrating the concentration of an oil mist nano-dispersion, belonging to the field of mechanical testing technology. The invention prepares a nanobubble solution using a porous membrane tube permeation method, employing a ceramic porous membrane tube in conjunction with a pressure tank to control the nanobubble particle size and concentration. A Malvern particle size analyzer is used to measure the solution concentration, which is then adjusted to the desired concentration through proportional dilution. The nanobubble solution is considered equivalent to an oil mist dispersion, and an optical measurement device is built based on the extinction method. A 900nm laser is used to irradiate the solution in a high-transmittance container, and the transmitted light attenuation intensity is measured using an optical power meter. The solvent used is carbon tetrachloride, chloroform, or dichloromethane, and the nanobubble gas is carbon dioxide, water vapor, or methane. The concentration is calculated based on Lambert-Beer's law. This method achieves stable control of oil mist concentration, avoids sampling errors, and improves the calibration accuracy and reliability of the oil mist detector.

Provided is a microfluidic dialysis module including an upper plate having an upper flow path through which a first fluid flows therein formed on one surface thereof, and an upper inlet through which the first fluid flows into the upper flow path and an upper outlet through which the first fluid flows out of the upper flow path; a lower plate having a lower flow path through which a second fluid flows therein, and having a plurality of lower inlets through which the second fluid flows into the lower flow path and a plurality of lower outlet through which the second fluid flows out of the lower flow path; a membrane disposed between the one surface of the upper plate and the one surface of the lower plate and formed in a porous membrane structure; and a fixing member coupling the upper plate and the lower plate.

A proton exchange membrane fuel cell (PEMFC) comprising a porous membrane element formed from a porous silicon wafer is disclosed, wherein the porosity is at least partially coated with a precious metal. Alternatively, the porous silicon wafer may be sandwiched between sheets of paper, carbon, or graphite impregnated with a precious metal. A separator is constructed using MEMS technology. Additionally, a lithium-ion battery is disclosed having a cathode electrode; an anode electrode formed from a porous silicon substrate, wherein the pore surface of the porous silicon substrate is at least partially coated with a metal silicide; a separator element disposed between the cathode and the anode; and an electrolyte.

The application relates to the technical field of water treatment, in particular to an iron-based photocatalytic composite membrane and a preparation method thereof. co AA co VI) copolymer and polyvinylidene fluoride are mixed uniformly in an organic solvent, defoamed, prepared into a porous membrane through a phase inversion method, then coordinated in an acidic aqueous solution of iron ions, and hydrothermally converted to obtain the iron-based photocatalytic composite membrane. The iron-based photocatalytic composite membrane has the beneficial effects that PVDF is used as a film-forming matrix, polymers are used as ligands, nano-iron oxides are generated in situ through hydrothermal reaction, iron ions are uniformly anchored, the introduction of g-C3N4 expands the visible light response, a heterojunction is formed with the iron oxides, the photocatalytic efficiency is improved, halloysite provides adsorption enrichment, cooperates with photocatalysis, the treatment efficiency is improved, the composite membrane has good stability, is convenient to recycle and reuse, and has a long service life.

This invention discloses a skin organ-on-a-chip, relating to the fields of biomedical engineering and microfluidics. The chip includes a drive module integrating a reservoir with a fixed height difference, a culture layer with arrayed independent skin culture units, and a fluid layer separated by a porous membrane. The drive module utilizes the hydrostatic pressure generated by the liquid level difference to drive the culture medium to form a stable laminar flow in an optimized fluid channel network, achieving pump-free perfusion. This invention achieves stable pump-free drive through a reservoir with a fixed height difference; the integrated sealed structure eliminates the risk of contamination and ensures complete isolation between units; the simulation-optimized uniform flow channel network, in synergy with the drive, ensures high consistency in high-throughput parallel culture, enabling the chip to provide a long-term stable biomimetic perfusion microenvironment. A single experiment can efficiently complete multiple replicates and multi-condition transdermal drug screening, toxicity testing, and disease model construction, improving experimental throughput, data reliability, and ease of operation.

The purpose of the present invention is to provide a polyphenylene ether solution with which it is possible to form a porous film at around room temperature (20°C). The solution to that problem is a polyphenylene ether solution containing polyphenylene ether and a water-soluble organic solvent having a solubility of 50 g / 100 mL or more in water at 20°C. The polyphenylene ether is a polyphenylene ether solution containing 1-99 mol% of repeating units derived from a phenol represented by formula (1) and 1-99 mol% of repeating units derived from a phenol represented by formula (2) per a total of 100 mol% of repeating units derived from a phenol represented by formula (1) and repeating units derived from a phenol represented by formula (2).

This invention relates to a method for preparing modified cellulose fiber nonwoven materials for ice crystal films. A porous membrane, consisting of a cellulose fiber spunlace nonwoven fabric with a three-dimensional texture, is tightly sandwiched between a soluble metal anode and an inert cathode to construct an electrolytic cell. The electrolytic cell is immersed in an electrophoretic modification solution containing negatively charged biocompatible macromolecules. A DC voltage is applied between the two electrodes, driving the macromolecules to actively penetrate into the spunlace nonwoven fabric via an electric field. An electrochemical oxidation reaction causes the soluble metal anode to release crosslinking ions in situ. These crosslinking ions then react with the migrated macromolecules in situ, forming a gel network within the fiber network. Finally, the product is obtained after rinsing and drying. This invention makes the preparation process more efficient, achieving deep and uniform penetration and efficient in-situ fixation of the modifier in the fiber substrate. It also protects and even strengthens the original physical texture during the modification process, resulting in high-performance gel mask materials.