147 results about "Membrane matrix" patented technology

Methods for defatting omentum and processes for preparing an a cellular omentum i.e., devitalized or decellularized omentum, comprising extracellular matrix for implantation into a mammalian system. Also constructs for medical applications comprising decellularized omentum.

Methods of nanoencapsulation are described herein. Embodiments of the method utilize the coacervation of a cationic polyelectrolyte with an anionic polyelectrolyte to form a novel capsular matrix. In particular, the novel methods may be used to encapsulate a suspension of a hydrophobic material such as a carotenoid. The disclosed methods do not require lengthy pH adjustments nor do they require the use of any toxic crosslinking agents. In one embodiment, a method of encapsulation comprises dispersing a hydrophobic compound in an organic solvent to form a solution. The method also comprises admixing an anionic polyelectrolyte and a cationic polyelectrolyte with the suspension to form a mixture. In addition, the method comprises quiescently cooling the mixture so as to cause self-crosslinking of a capsular matrix encapsulating the hydrophobic particles.

A liquid membrane matrix is disclosed in the form of an aquaporin containing bulk liquid membrane matrix (BLM), wherein said liquid membrane matrix is formed from a solution of an amphiphilic copolymer detergent wherein transmembrane proteins have been functionally incorporated and wherein said matrix further contains a stabilising oil phase. The uses of the membrane matrix include water extraction from liquid aqueous media by forward osmosis, e.g. for desalination of salt water.

The invention provides a method for preparing a composite nanofiltration membrane by tannic acid / Fe<3+> cocoating, relating to a method for preparing a composite nanofiltration membrane. The method aims to solve the following problems in the existing nanofiltration membrane: the separating property is poor, the structure is not stable, the nanofiltration membrane can be easily polluted by microbes, and a large amount of organic solvent is used in the membrane preparation process. The method comprises the following steps: 1. preparing a polymer solution; 2. preparing an ultrafiltration membrane matrix; 3. preparing a tannic acid / Fe<3+> water phase solution, soaking the ultrafiltration membrane matrix in the tannic acid / Fe<3+> water phase solution, and standing to obtain the tannic-acid / Fe<3+>-cocoated composite nanofiltration membrane. The composite nanofiltration membrane has higher interception rate in the separation process of organic dyes, and the interception rate for the methyl blue dye is higher than 95%. The water seepage flux is up to 10<9>L / m<2>.h. The invention discloses a method for preparing a composite nanofiltration membrane by tannic acid / Fe<3+> cocoating.

The present invention relates to a biofabricated Active Microfluidic Membrane (AMM) in a microfluidic network of a microfluidic device and a method for the in situ biofabrication of such a microfluidic network. More specifically, the invention relates to devices exhibiting (and methods of) positioning (i.e., erecting, modifying or removing a membrane matrix in situ in a microchannel of a microfluidic network of a microfluidic device. In one embodiment, the membrane comprises a single type of matrix constituent, such as chitosan, alginate, etc. Alternatively, the membrane may be composed of two or more matrix constituents, which may be integrated into one another or layered adjacent to one another.

The invention provides a multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof. The multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane is prepared from polyvinylidene fluoride, N-N-dimethylacetamide and multi-walled carbon nanotubes. According to the conductive ultrafiltration membrane, the insulated polyvinylidene fluoride serves as a film-forming matrix, the carboxylated multi-walled carbon nanotubes serve as a nano conductive filler, the multi-walled carbon nanotubes are uniformly dispersed in the matrix by adopting an ultrasonic dispersion method, and the multi-walled composite conductive carbon nanotube-polyvinylidene fluoride ultrafiltration membrane is prepared by adopting a wet-phase inversion method. Because the carbon nanotubes have the extremely high conductivity, the conductive performance of the composite membrane is well improved due to the addition of the carbon nanotubes, and the strength and the hydrophilicity of the membrane are enhanced. Therefore, the membrane can be effectively prevented from being polluted during water treatment, and the service life of the membrane is prolonged. The preparation method and a process flow are simple, the operation is convenient, the cost is low, equipment is not required to be transformed, and the operability is high.

The method for preparing proton exchange membrane includes the following steps: dissolving membrane matrix high-molecular polymer in solvent, adding inorganic matter to form suspended substance, breaking said suspended substance by using nano breaking technology to obtain uniformly-dispersed mixture, using pouring method to make membrane with compact structure. The membrane has good stability andhigh application temperature, can make pile have good electrochemical stability and reliability, and can raise specific power of fuel cell.

The invention discloses a composite membrane for a lithium ion battery and the lithium ion battery using the same. The composite membrane comprises a membrane matrix and a polyelectrolyte composite layer, wherein the membrane is a ceramic composite membrane consisting of yttrium oxide-stabilized zirconium oxide and polyelectrolyte; in the yttrium oxide-stabilized zirconium oxide, the yttrium oxide accounts for 8 to 13 weight percent and the zirconium oxide accounts for 87 to 92 weight percent; and the polyelectrolyte of the ceramic composite membrane accounts for 0.1 to 2.0 percent of the total weight of the membrane. The lithium ion battery using the composite membrane comprises an electrode assembly and nonaqueous electrolyte which are sealed in a battery shell, and the composite membrane is the ceramic composite membrane. By compounding ceramic and the polyelectrolyte, the composite membrane can effectively improve the wetting property of organic electrolyte to the ceramic membrane, the solution holding capacity of ceramic pores, and the work safety of the battery.

The invention provides a chitosan functionalized graphene oxide / polyvinylidene fluoride hybrid ultrafiltration membrane and a preparation method thereof. Firstly, chitosan is used for covalent functionalization of graphene oxide to prepare chitosan-graphene oxide; the chitosan-graphene oxide is dispersed in an organic solvent in an ultrasonic mode, then polyvinylidene fluoride and a pore-foaming agent are added and stirred at certain temperature to be evenly dissolved to obtain a membrane casting solution, water serves as a coagulating bath, and the chitosan-graphene oxide / polyvinylidene fluoride hybrid ultrafiltration membrane is prepared through the immerged phase-inversion process. The chitosan-graphene oxide / polyvinylidene fluoride hybrid ultrafiltration membrane prepared through the method improves dispersibility of graphene oxide in a membrane matrix, and compared with a graphene oxide / polyvinylidene fluoride ultrafiltration membrane, hydrophilicity, water flux, antifouling property and other aspects are greatly improved.

The invention discloses a preparation method for increasing the particle load capacity of a multifunctional hybrid membrane, and belongs to the technical field of membrane separation for wastewater treatment. The preparation method for increasing the particle load capacity of the multifunctional hybrid membrane comprises the following steps: pre-dispersing a granular material to obtain a dispersion, uniformly mixing the dispersion with a membrane matrix composition composed of a polymer and an organic solvent in order to form a mixed solution, heating the mixed solution to removing a dispersant to a membrane casting solution, knife-coating the matrix carrier with the membrane casting solution, and carrying out phase conversion to remove the organic solvent in order to produce the multifunctional hybrid ultrafilter membrane. Nano-particles are pre-dispersed by the dispersant to improve the dispersibility of the granular material in the film; and the viscosity and the concentration of the membrane casting solution are ensured by removing the dispersant. The method can keep the ultrafiltration performance and the permeation performance of the multifunctional hybrid membrane under a high particle load capacity, and also can improve the treatment effect of the unit mass of the granular material.

The invention relates to a membrane matrix protein chip for detecting mycotoxin and a preparation method thereof. The membrane matrix protein chip for detecting mycotoxin comprises a polyvinylidene fluoride membrane substrate and six spotting substances of bovine serum albumin conjugates of aflatoxin B1, zearalenone, ochratoxin A, deoxynivalenol, fumonisins B1 and fumonisins B2. The preparation method comprises the following steps: after soaking the polyvinylidene fluoride membrane in methanol, leveling the membrane on the upper end of filter paper; spotting the spotting substances on the membrane by a spotting instrument; after incubation, closing redundant sites which do not combine with the spotting substances on the membrane by hybridprotein; and carrying out vacuum encapsulation after washing and airing. The invention has the advantages of simple operation, convenience, high speed, determination of various types of mycotoxin at a time without any instrument and equipment, long-term storage, simple preparation process and large-scale production and has the characteristics of high sensitivity of ELISA, discrimination by naked eye of the colloidal gold immunity chromatography technology and high flux detection of biochips.

The invention belongs to the field of materials and discloses a high-throughput composite filter membrane based on an inner hole property of carbon nanotubes and a preparation method. The filter membrane is composed of the carbon nanotubes and a polymer; the polymer is used as a membrane matrix and the carbon nanotubes are directionally arrayed in the membrane matrix; the filter membrane takes inner holes of the carbon nanotubes as fluid transportation channels; the preparation method of the high-throughput composite filter membrane based on the inner hole property of the carbon nanotubes is characterized by comprising the following steps: a) applying a vertical electric field to a dispersed carbon nanotube-polymer dispersion solution through upper and lower pole plates; combining heatingand drying to obtain a dried carbon nanotube composite membrane; b) carrying out plasma etching on the dried composite membrane, so as to obtain the high-throughput composite filter membrane based onthe inner hole property of the carbon nanotubes. The filter membrane utilizes the inner hole property of the carbon nanotubes, so that compared with a traditional nano filter membrane, a flow speed ismore rapid and the throughput is high; membrane pollution is not easy to cause and the electrical conductivity is excellent, so that the high-throughput composite filter membrane is easy to popularize.

The invention discloses a high-performance Janus forward osmosis membrane, comprising a first surface of a super-hydrophilic polymer microporous membrane, a polymer membrane matrix intermediate layerand a second surface away from the first surface and coated with a super-hydrophobic inorganic nanoparticle coating, wherein the water droplet infiltration time of the first surface of the super-hydrophilic polymer microporous membrane is less than two seconds, and the second surface coated with the super-hydrophobic inorganic nanoparticle coating has a water droplet contact angle of greater than150 degrees. The Janus forward osmosis membrane has the advantage of high water flux and low-salt reverse diffusion flux.

The invention relates to the field of membrane separation and aims at providing an in-situ compatibilization organic-inorganic hybrid membrane and a preparation method. The hybrid membrane contains inorganic nanoparticles; and the inorganic nanoparticles are connected with a membrane matrix polymer through an N-C covalent bond and uniformly dispersed in the membrane. With amino on the surface, the inorganic nanoparticles react with the membrane matrix polymer under the condition of heating, and the fixation of a polymer chain on nanoparticle surfaces is realized in situ. The method has the characteristics of simplicity in operation, high efficiency and good modifying effect, can improve the filtering efficiency of the membrane and enable the membrane to have special properties such as hydrophilicity, specific adsorbability and catalytic property, and is applicable to the fields such as drinking water treatment, sewage treatment, oil-water separation, seawater desalination, hemodialysis and catalytic separation.

The invention relates to a method to measure the bond strength of the silicon matrix and the membrane matrix in the measuring technical field. The method is realized by that a pattern with a window is made at the back of a silicon foundation base by an etching method, a part of foundation base is reserved as a loading platform in the window, a facial membrane of the foundation base is exposed in the back window, when the reserved matrix is pressed to break through the matrix and drive the membrane to break away with the matrix, a happened maximum normal displacement is recorded, a free energy releasing rate is gained by an prior formula, to characterize the bond strength of the membrane matrix system. The invention overcomes the shortage that the requirement of the observational measurement or the sample size of the prior detecting equipment is high, depends on the prior equipment and a mature sample making process, and uses a touching type back breaking through method to comparatively quickly detect the bond strength of the membrane matrix in the fixed quantity under a complex shape.

The invention discloses a preparation method for a thermoplastic matrix super-hydrophobic membrane. A pressure sintering method is adopted to press mixed powder of micro-sized powder particles and nanometer-sized powder particles on a super-hydrophobic layer into surface of the thermoplastic membrane matrix. The operation is simple and the super-hydrophobic layer consists of the micro-sized powder particles and nanometer-sized powder particles which are arranged alternatively and are embedded in the membrane matrix to form micro-sized convex and nanometer-sized convex. The manufactured super-hydrophobic surface has relatively high intensity and relatively low manufacturing cost; and the super-hydrophobic structure can be manufactured and used on a large scale. The super-hydrophobic layer has a water contact angle of 150-165 degrees and a rolling angle less than 5 degrees. The super-hydrophobic layer has stable performance, low cost and excellent mechanical property and is applicable to places requiring water proofing, antifouling, fog proofing, snow coating proofing, ice coating proofing and oxidation proofing. The thermoplastic membrane matrix is used, therefore, the super-hydrophobic membrane can be flexibly used. The super-hydrophobic membrane can be manufactured into a tape structure to be adhered on surfaces of other matrices. The super-hydrophobic membrane is convenient and simple in use, easy to popularize and is a super-hydrophobic structure which can be manufactured and used on a large scale.

The invention relates to a gas permeable membrane for the optical measurement of the partial pressure and / or the concentration of a gas species, the membrane comprises a porous light-transmissible membrane matrix containing a metal oxide wherein the membrane matrix is at least partially charged with at least one gas-selective compound whose optical characteristics change upon an interaction with a corresponding gas species. The average pore diameter of the pores of the membrane matrix ranges from 1 to 50 nanometers, the total pore volume from 1 to 30 mL / m2 and the metal oxide is pseudo-boehmite with the general formula AI2O3·n*H2O, wherein n ranges from 1 to 1.5, or an alumina oligomer. Further, the invention relates to the use of the membrane for the measurement of the presence, the partial pressure and / or the concentration of a gas, for example in cultivation flasks and bags, in gas atmospheres, incubators, medical devices, solutions, vapors and exhaust gases. In another aspect, the invention provides a method for the manufacture of the membrane according to the invention.

The invention relates to the technical field of membranes and particularly relates to a polyamide hollow fiber nanofiltration membrane and a preparation method of the polyamide hollow fiber nanofiltration membrane. The preparation method comprises the following steps of 1) preparing a hollow fiber basement membrane through nonsolvent-induced phase separation: the preparation method of the hollow fiber basement membrane comprises the following steps of evenly mixing a membrane matrix phase, a solvent, a pore foaming agent and multi-element acyl chloride, standing to remove foams, wherein the various components comprise 2-20 parts of the membrane matrix phase, 30-60 parts of the solvent, 1-10 parts of the pore foaming agent and 1-10 parts of multi-element acyl chloride according to the mass proportion; heating to 50-70 DEG C, flowing through a spinneret plate to a coagulating basin to coagulate into a nascent fiber; and winding the nascent fiber formed through coagulating, soaking in glycerinum, and drying to prepare the polyamide hollow fiber basement membrane; and 2) preparing the polyamide hollow fiber nanofiltration membrane. The prepared basement membrane comprises the substance of multi-element acyl chloride, the compatibility with a multi-element acyl chloride organic solution coating the surface of the membrane is higher, and the interface stability of the basement membrane and a functional layer formed through polymerization is higher.

The invention belongs to the technical field of membranes, and particularly relates to a NafionTM-modified carbon quantum dot-polymer hybrid proton exchange membrane and a preparing method thereof. According to the method, polymer NafionTM and citric acid are firstly mixed and reacted under nitrogen protection to obtain NafionTM-modified carbon quantum dots, and then the prepared carbon quantum dots are mixed with a polymer solution to prepare the hybrid proton exchange membrane. Because of modification with the NafionTM, the carbon quantum dots have good dispersibility in the polymer matrix, and the proton conductivity of the prepared hybrid proton exchange membrane is increased by an order of magnitude. Through interaction between the carbon quantum dots and a membrane matrix, permeability channels of methanol in the membrane are more winding. The method has characteristics of simple and convenient operation, environment protection, easy batch and large-scale production, good industrial production bases and a wide application prospect.

The invention discloses a chronic glaucoma animal model establishing method. The method comprises the following steps: (1) collecting conjunctiva tissues of GFP-SD rats, sterilizing, digesting, separating a conjunctiva epithelial layer, and obtaining a conjunctiva matrix tissue block; (2) digesting the conjunctiva matrix tissue block in pancreatin, terminating the digestion by using a cell culturesolution, blowing and beating to form a single-cell suspension, filtering by virtue of a cell sieve, centrifuging, and removing supernatant, thus obtaining conjunctiva matrix cell precipitates; (3) adding an appropriate amount of cell culture solution, blowing and beating to form single cells, counting, performing the in-vitro culture, and obtaining a remarkable amount of conjunctiva matrix cells; (4) digesting the conjunctiva matrix cells by using pancreatin, processing by utilizing the method of the step (2), obtaining the conjunctiva matrix cell precipitate, adding an appropriate amount ofcell culture solution, and obtaining cell suspension; and (5) injecting 10 micro liter of cell suspension by utilizing a micro injector into the anterior chamber of the right eye of a rat, and sufficiently and uniformly mixing. A glaucoma animal model obtained by using the method has the advantages of long-term stability, simplicity, ease, good repetition, and low cost.

The invention discloses a method for preparing a mono- / multi-valent ion exchange membrane by membrane fouling and electrodialysis deposition. The method utilizes a phenomenon that an electrolyte in asolution performs fouling on an ion exchange membrane, and employs an electrodialysis process to foul the surface or interior of a to-be-modified ion exchange membrane by a target pollutant so as to enable the ion exchange membrane to have a mono- / multi-valent ion selective permeability, so that the mono- / multi-valent ion exchange membrane is obtained. According to the method of the invention, through chemical bond combination between the target pollutant and the ion exchange membrane main structure, the surface resistance is effectively reduced, the limiting current density under electrodialysis operating conditions is improved, and peeling of a modification compound from a membrane matrix is avoided during long-term operation. The method has a simple operation process, is easy to industrialize, has a wide range of raw materials, and has low cost in the membrane modification process.

The invention belongs to the technical field of packaging materials, and particularly relates to a preparation method of a gallic acid cross-linked chitosan-gelatin active composite membrane. The preparation method comprises the following steps: mixing a chitosan solution and a gelatin solution, and uniformly stirring to obtain a chitosan-gelatin blended solution; then preparing a gallic acid aqueous solution, adding the gallic acid aqueous solution into the chitosan-gelatin blended solution, fully stirring, and reacting to obtain a film forming solution; and pouring the film forming liquid into a flat plate, drying to form a film, and lightly stripping the film from the flat plate to obtain the active composite film. The chitosan-gelatin-gallic acid active composite membrane is prepared by taking a chitosan and gelatin blended solution as a membrane matrix, taking gallic acid as a natural cross-linking agent and adding an active substance. The active membrane has the characteristics of good mechanical properties, strong antioxidant and antibacterial capabilities and the like, has no toxic effect on a human body, and is safe and environment-friendly; and the composite membrane can be used as a food packaging material, and can effectively delay the decay process of food, thereby prolonging the shelf life of food.

The invention discloses an immuno-chromatography detection device and a detection method thereof, which comprise a membrane matrix. The membrane matrix is provided with a sample pad, a marker pad carrying a marker which consists of reactive substance and indicative substance, a detection belt coated or chemically linked crosswise with the reactive substance and an absorbent pad in turn. The marker is multi-functional polymer formed by the coupling of the reactive substance and the indicative substance on a polymer framework. The detection belt is the reactive substance coated or chemically linked crosswise with the membrane matrix or reactive polymer formed by the coupling of the reactive substance on the polymer framework. The detection method is that the sample swims on a membrane and the object to be tested reacts with the marker on the marker pad through the marker pad, then swims to the detection belt to react with the reactive substance under the capillary action, and is developed or checked out through the indicative substance. The invention provides the immuno-chromatography device with high sensitivity and specificity, and the immuno-chromatography detection method with high sensitivity, quickness and reliability.

Certain embodiments of the invention provide an apparatus for separating aromatic hydrocarbons from an aromatic hydrocarbon feed stream. The apparatus includes a membrane support, and a hydrophilic polymer membrane matrix disposed on the membrane support. The hydrophilic polymer membrane matrix includes an effective amount of polyvinyl alcohol and an effective amount of sodium alginate. The apparatus further includes a carrier agent bonded to the hydrophilic polymer membrane matrix using a cross-linking agent. The carrier agent exhibits a greater affinity for aromatics compared to aliphatics. The apparatus further includes a membrane housing configured to hold the membrane support. The membrane housing includes an inlet, a permeate outlet, and a retentate outlet, the inlet being operable to receive the aromatic hydrocarbon feed stream, the permeate outlet being operable to discharge a permeate stream, and the retentate outlet being operable to discharge a retentate stream.

The invention provides a preparation method of an edible fresh-keeping film and an application of the film in material fresh-keeping. The edible fresh-keeping film uses collagen-chitosan as a film matrix. Camellia oil, milk powder and other health care substances are added to improve the nutritional value of the film. Glycerol, genipin, sucrose esters and the other film-forming promoters with medicinal effects are added, which effectively improves the health value and mechanical ability of the film prolongs the fresh-keeping time, and has the effects of multi-function, environmental protectionand the like. The film can be used for packaging various materials such as food, health care products, medicine and feed. Meanwhile, the film can be eaten together with packaged materials to providea health care effect.

The invention belongs to the field of material preparation technologies and detection technologies and provides a preparation method of an imprint optical-response recognition membrane of a sulfamethoxazole molecule. The preparation method comprises the following steps: step 1, preparing nano-crystalline cellulose (NCC); step 2, synthesizing a resin imprint precursor polymer of sulfamethoxazole; step 3, preparing an original membrane which is structurally colored; step 4, preparing an imprint optical-response recognition mesoporous membrane. According to the preparation method provided by the invention, green and recyclable liquid-crystal cellulose is used as a membrane matrix and is evaporated at room temperature and self-assembled to form a colored membrane which is regularly arrayed; a molecular imprint technology has a selective recognition property; the conversion from a complicated microscopic signal to a macroscopic visualized signal is applied to a technology for recognizing polluted target molecules.

The invention discloses a high-durability fuel cell composite proton exchange membrane, and a preparation method and an application thereof. The high-durability fuel cell composite proton exchange membrane comprises a membrane matrix and a metal oxide free radical quenching agent dispersed in the membrane matrix, and the surface of the free radical quenching agent is provided with an organic matter coating layer. Compared with a common Dupont Nafion membrane, the durability of the composite membrane coated with the polydopamine is greatly improved. The preparation process is simple, safe and low in cost, and can be used for industrial production of the composite proton exchange membrane.

Porous matrices and membrane matrices comprising sulfonated aryl sulfonate polymers are prepared from a sulfonated aryl sulfonate polymer solution which is made by dissolving an aryl sulfonate polymer, and optionally a polymer other than aryl sulfonate, in a sulfonating acid solvent such as sulfuric acid. The solutions are then cast as wet films from which the matrices are coagulated. By controlling composition and process parameters, hydrophilic matrices of varying morphology are produced.

The invention discloses a composite algal polysaccharide-based double-layer packaging film as well as a preparation method and application thereof. The preparation process mainly comprises the following steps: firstly, dissolving agar, sodium alginate and glycerol in water to form a film forming solution, preparing a film forming emulsion from a part of the film forming solution, essential oil andTween 80, and preparing a crosslinking solution from a part of the film forming solution and a calcium chloride solution; and drying the film-forming emulsion at low temperature to obtain an inner-layer film, paving the crosslinking solution on the surface of the dried inner-layer film, and drying at low temperature again to obtain the double-layer antibacterial film. The preparation method is simple and low in cost, and raw materials are easy to obtain; the prepared sodium alginate-agar-ginger essential oil composite antibacterial film is mainly formed through non-covalent bond physical crosslinking, a film matrix has an obvious porous structure, and a compact and continuous outer layer film can effectively slow down volatilization and release of essential oil, so that the preservative and fresh-keeping effects of the antibacterial film are better improved.