40 results about "Membrane property" patented technology

The present invention relates to a branched and sulphonated multi block copolymer and an electrolyte membrane using the same, more precisely, a branched and sulphonated multi block copolymer composed of the repeating unit represented by formula 1 and a preparation method thereof, a hydrogenated branched and sulphonated multi block copolymer, a branched and sulphonated multi block copolymer electrolyte membrane and a fuel cell to which the branched and sulphonated multi block copolymer electrolyte membrane is applied.The electrolyte membrane of the present invention has high proton conductivity and excellent mechanical properties as well as chemical stability, so it can be effectively used for the production of thin film without the decrease of membrane properties according to the increase of sulfonic acid group since it enables the regulation of the distribution, the location and the number of sulfonic acid group in polymer backbone.

The present invention provides optical systems and methods for determining a characteristic of a cell, such as cell type, cellular response to a biochemical event, biological state and the like. The methods typically involve using interferometry to observe membrane properties in a cell and then use this information to determine one or more characteristics of a cell. The methods of the invention are useful for applications such as drug screening as well as diagnostic techniques.

The invention belongs to the field of composite materials, and relates to a preparation method of a polyvinylidene fluoride (PVDF) porous coordination composite ultrafiltration membrane material. The preparation method is characterized in that transition metal ions are immobilized on a PVDF membrane by using molecules with double amino groups, and the in-situ growth of porous coordination polymers (PCPs) in an organic ligand solution is realized. The preparation method provided by the invention has the advantages that a new method for preparing the PVDF / PCPs composite ultrafiltration membrane material by a one-pot method is developed; PVDF and the PCPs are connected through chemical bonds, and the high-stable ultrafiltration membrane material is formed; by adjusting the types and content of organic ligands and metal source ions in a precursor solution, reaction conditions, and the like, the pore structure, growth amount, and the like of the PCPs can be effectively controlled, thereby achieving the directional regulation and control of membrane properties; the PVDF / PCPs ultrafiltration membrane material prepared by the method integrates porosity and hydrophilicity, the anti-fouling ability of an ultrafiltration membrane is improved, and the service life is prolonged.

A contactor configured for use in a dehumidification system is provided including a plurality of contact modules. Each contact module has a porous membrane that defines an internal space through which a hygroscopic material flows. A membrane property of the porous membrane of at least one contact module is substantially different than the other membranes of the plurality of contact modules.

The invention relates to a lithium ion battery formation method capable of optimizing SEI film performance. In the method, a sample battery is firstly taken to measure the film-forming potential, and then at all film-forming potentials, a sinusoidal alternating current is set for periodic charging and discharging. , and repeated many times, in the potential range where no film formation occurs, you can choose to charge with a larger current. The invention can design a targeted formation process for the lithium ion battery, and at the same time, adopt high-current charging in the potential range where no film formation occurs, so the formation time can be saved while improving the overall performance of the battery, and the battery production cycle can be shortened.

The invention discloses preparation of modified micropore spheres on the basis of a ZIF-8 type metal-organic framework material and a preparation method for preparing a novel polyphenylene sulfone solvent-resistant nanofiltration membrane by applying the modified micropore spheres. The method comprises the steps that ZIF-8 nanoparticles grow inside macropore spheres and on the surfaces of the macropore spheres, and the modified micropore spheres are obtained; the modified novel micropore spheres are added to a polyphenylene sulfone membrane casting solution, and the novel polyphenylene sulfone solvent-resistant nanofiltration membrane containing the modified micropore spheres is prepared through an immersion-phase conversion method. The reparation method of the novel polyphenylene sulfone solvent-resistant nanofiltration membrane containing the modified micropore spheres has the advantages that nano-scaled porous structures of the modified micropore spheres are utilized for improving the pore structure of the polyphenylene sulfone membrane, large-size solute molecules in the organic solution are effectively intercepted, and fluid channels, facilitating solvent permeation, in the membrane are increased; when the addition ratio of the modified micropore spheres is 1.0 wt%, the membrane property is the best, and the permeation flux and interception rate can be increased simultaneously.

The invention relates to a preparation method of a strong-acid-resistant strong-base-resistant polyether sulfone tubular ultrafiltration dry membrane, which comprises the steps of: carrying out heat treatment on the existing strong-acid-resistant strong-base-resistant polyether sulfone tubular ultrafiltration wet membrane; then soaking the treated wet membrane into membrane drying treatment fluid; and finally drying the polyether sulfone tubular ultrafiltration wet membrane to obtain the tubular ultrafiltration dry membrane which is stable in membrane properties, resists strong acid and strong base, and is high in mechanical strength and good in water permeability. The tubular ultrafiltration dry membrane is simple and feasible in preparation method and can be continuously produced; and the produced membrane product can be stored in a dry state, and is convenient for pouring of a membrane component and convenient to store and transport.

A branched multiblock polybenzimidazole-benzamide copolymer, specifically, one consisting of a repeating unit represented by Formula 1, and a method for preparing the same; an electrolyte membrane using the branched multiblock copolymer, a consistent electrolyte paste / gel and a method for preparing the same; a membrane-electrode assembly (MEA) using the electrolyte membrane and the consistent electrolyte paste / gel and a method for preparing the same; and a fuel cell prepared from the membrane-electrode assembly. The electrolyte membrane according to the present invention has high hydrogen ion conductivity over a wide temperature range, and excellent physical properties such as mechanical properties, chemical resistance and thermal stability. Deterioration of the membrane properties is effectively controlled by phosphoric acid doping and high hydrogen ion conductivity is realized even with a low phosphoric acid doping level. This consistent electrolyte paste / gel may be useful in improving the operating performance of a fuel cell by coating the electrolyte uniformly.

Mesoporous membranes have shown promising separation performance with a potential to lower the energy consumption, leading to a dramatic cost reduction. Recently, an extensive effort has been made on the design of membranes which brought a significant progress toward the synthesis of well-defined porous morphologies, most of which synthesized by surfactant-template methodology. Currently, the most well-designed state-of-the-art membranes using this technique are made from metals, polymers, carbon, silica, etc. In the present invention, we demonstrate mesoporous calcium-silicate particles having superior separation capacity and optimal permeability, thereby leading to reduced energy consumption for selective separation of gases / liquids and / or the combination thereof. We explore various methods to improve the calcium-silicate membranes properties by tuning pore density during the synthesis / aging process, while favoring the formation of uniformly distributed nanopores. Lowering particle density by controlling calcium to silicon ratio along with optimizing the surface area are essential in achieving our objective.

The invention features methods for regulating vascular properties by controlling the membrane properties of endothelial cells using optogenetics and light. The invention features methods to transport therapeutics across the vascular barrier into tissues such as the brain and the lung, with high spatial and temporal precision, and for controlling vascular properties such as vascular tone, arterial diameter, and vascular growth.

A method for in situ monitoring of a membrane of a membrane separation system comprises measuring a complex impedance of the membrane at a plurality of frequencies to provide an indication of the electrical conduction and electrical polarization properties of the membrane. The membrane based separation system for removing or reducing the concentration of materials carried in a fluid including a separation membrane has a first pair of electrodes separated by the membrane and arranged for measurement of the complex impedance of the membrane at a plurality of frequencies to provide the indication of the membrane properties. There may also be a second pair of electrodes separated by the membrane for injecting the stimulus current such that the injecting and monitoring functions are separated.

A branched multiblock polybenzimidazole-benzamide copolymer, specifically, one consisting of a repeating unit represented by Formula 1, and a method for preparing the same; an electrolyte membrane using the branched multiblock copolymer, a consistent electrolyte paste / gel and a method for preparing the same; a membrane-electrode assembly (MEA) using the electrolyte membrane and the consistent electrolyte paste / gel and a method for preparing the same; and a fuel cell prepared from the membrane-electrode assembly. The electrolyte membrane according to the present invention has high hydrogen ion conductivity over a wide temperature range, and excellent physical properties such as mechanical properties, chemical resistance and thermal stability. Deterioration of the membrane properties is effectively controlled by phosphoric acid doping and high hydrogen ion conductivity is realized even with a low phosphoric acid doping level. This consistent electrolyte paste / gel may be useful in improving the operating performance of a fuel cell by coating the electrolyte uniformly.

The invention relates to a method for improving a sizing adhesive formula by means of ammonium dihydrogen phosphate, and belongs to the field of textile processing. The method comprises the step of adding the ammonium dihydrogen phosphate to the sizing adhesive formula containing phosphate ester starch, acrylic ester and water, wherein the mass of the phosphate ester starch is 3%-5% of the total mass of the phosphate ester starch, the acrylic ester, the ammonium dihydrogen phosphate and the water, the mass of the acrylic ester is 3%-5% of the total mass of the phosphate ester starch, the acrylic ester, the ammonium dihydrogen phosphate and the water, and the mass of the ammonium dihydrogen phosphate is 0.1%-1% of the total mass of the phosphate ester starch, the acrylic ester, the ammonium dihydrogen phosphate and the water. The permeability of mixed sizing agents and the coating property of an adhesive for yarn surface sizing can be significantly improved, and therefore the sizing membrane property and the sizing effect are enhanced.

The invention discloses a film water curing technique of multifunctional hyperfiltration film off-line purifier, which is characterized by the following: the pollution in reverse osmosis membrane system is cleared by carrying out the techniques of film positive washing, negative washing and pure water side pressurization washing; the invention can evaluate and test agent and reverse osmosis membrane property by imitating field producing water condition.