22 results about "Membrane thickness" patented technology

This invention belongs to the field of membrane separation and functional membrane materials technology, and discloses a chiral graphene oxide-based separation membrane, its preparation method, and its application. The membrane is composed of graphene oxide and / or reduced graphene oxide sheets and a single-stranded DNA-single-walled carbon nanotube complex. The single-stranded DNA helically winds around the outer surface of the single-walled carbon nanotubes to form a one-dimensional chiral nanochannel and intercalates between the sheets, forming a three-dimensional chiral channel network connected in the membrane thickness direction. The preparation method includes: heating and decohexing salmon sperm double-stranded DNA in a urea-containing buffer to obtain single-stranded DNA; dispersing single-walled carbon nanotubes and then complexing them with the single-stranded DNA; further mixing with a graphene oxide or reduced graphene oxide dispersion; and vacuum filtration to form the membrane. This membrane exhibits a high separation factor for chiral enantiomers such as L / D-phenylalanine, with an excess value of up to 99.95% for L-phenylalanine enantiomers after multi-stage separation, making it suitable for the efficient separation of chiral drugs and amino acids.

The utility model discloses a device capable of adjusting the thickness of a lamination film, which relates to the technical field of lamination machines, and comprises a base, the top of the base is fixedly connected with a conveyor, a first fixing frame and a second fixing frame, the inner top wall of the first fixing frame is connected with two sliding frames in a sliding manner, the interior of each sliding frame is rotatably connected with a lamination film roller, and the lamination film roller is fixedly connected with the conveyor. The inner top wall of the first fixing frame is fixedly connected with a liquid dropping pipe, the liquid dropping pipe is fixedly communicated with a liquid conveying pipe, the two film spraying rollers are installed below the liquid dropping pipe, the distance between the two sliding frames is adjusted through a first adjusting mechanism, and therefore the gap value between the two film spraying rollers is adjusted, the film spraying liquid dropping speed is controlled, and the film spraying speed is improved. The surface of a material is scraped through the scraping plate, and the distance between the scraping plate and the material is adjusted by controlling the sliding rod to slide on the second fixing frame, so that the thickness of a coating film on the surface of the material is adjusted.

There is provided a porous membrane comprising: an upstream porous asymmetric layer having an asymmetric layer thickness and a porous structure that reduces passage of bacteria therethrough; a downstream porous isometric polymer layer in contact with the porous asymmetric layer, the porous isometric layer having an isometric layer thickness and a porous structure that reduces passage of bacteria therethrough; wherein the porous membrane has a total membrane thickness; and the isometric layer thickness is 45% to 80% (e.g., 48-80%) of the asymmetric layer thickness.

This invention relates to a membrane tension compensation method based on the detection of uniformity in the thickness of water-soluble membranes produced by dishwashing pods. Addressing the problem that membrane thickness distribution is sensitive to nonlinear tension disturbances under high-speed operation conditions during water-soluble membrane production, and that traditional thickness control methods struggle to achieve precise closed-loop compensation, this invention proposes a method that continuously collects cross-sectional thickness information of the membrane material, constructs a time-space thickness sequence, extracts thickness gradient topological features, combines a multidimensional tension sensitivity feature vector with a dynamic thickness gradient topological graph, and uses a layer-by-layer sparsely connected lightweight graph convolutional network to infer the tension compensation amount. After median filtering and denoising, the result drives the actuator to adjust in real time, achieving high-precision closed-loop compensation for the uniformity of the water-soluble membrane thickness. This method improves the sensitivity and stability of thickness control under nonlinear disturbance environments, while also possessing both real-time performance and computational efficiency.

This invention proposes a Zr-based membrane for separating benzene / cyclohexane and its preparation method. The Zr-based membrane includes Zr-BDC membranes, Zr-BDC-PAA, or Zr-BDC-PVA. A polymer is introduced into the Zr-BDC framework via a secondary growth method to improve the membrane's selectivity for separating benzene / cyclohexane. The Zr-based membrane is directly synthesized using an in-situ growth method, which is simple in process. By adjusting the membrane growth time, good benzene / cyclohexane separation performance is achieved. Zr-BDC-PAA or Zr-BDC-PVA membranes are organic-inorganic hybrid membranes. The addition of polymers can adjust the membrane's pore structure, enhance its polarity, improve the size selectivity for separating benzene / cyclohexane, promote the intercalation of the Zr-BDC membrane, and influence the membrane thickness to some extent. The Zr-BDC membrane, by adjusting the growth time, grows more densely and continuously, thus exhibiting good benzene / cyclohexane separation performance.

This invention provides a method for preparing a water-stable MOF-808 membrane and its application in the removal of organic pollutants from saline wastewater. The preparation steps of the MOF-808 membrane are as follows: a polymer-modified or seed-coated porous support is subjected to a solvothermal reaction with a precursor solution; after the reaction, the membrane is washed and dried to obtain a polycrystalline MOF-808 membrane. The MOF-808 membrane prepared by this invention has good intergrowth properties and uniform membrane thickness. When used for dye desalination, the obtained MOF-808 membrane has a thickness of 4.37 μm. ‑2 h ‑1 bar ‑1 The membrane exhibits high permeation flux and a salt / dye separation coefficient of 287.3, demonstrating excellent long-term operational stability. It is characterized by low cost / energy consumption and high separation efficiency. Even under acid, alkali, salt, and heating conditions, the MOF-808 membrane remains stable. Based on these characteristics, this membrane material demonstrates excellent separation performance for organic pollutants in high-salt environments, providing a feasible solution for the removal of organic pollutants from saline wastewater.

The present invention relates to a method for preparing a microporous membrane based on a PTFE emulsion. The microporous membrane is obtained by using a PTFE emulsion as a main body, mixing same with a water-soluble polymer material serving as a structural carrier, forming a membrane by means of blade coating, forming pores by means of freezing, and performing a heat treatment. The PTFE membrane prepared in the present invention has a unique pore structure, and the thickness, porosity, sectional pore structure, membrane mechanical properties, etc. of the membrane material can be adjusted by adjusting the composition of the structural carrier, blade coating conditions, and freezing and sintering parameters. Compared with the preparation of a PTFE membrane by means of mechanical stretching, the present invention has the advantages of a simple preparation process, uniform pore structure, uniform membrane thickness, etc., and is suitable for accurate separation of heterogeneous materials in a harsh separation environment.

This utility model relates to the field of waterproof membrane testing technology, specifically disclosing a waterproof membrane thickness testing device, including a support frame for support, a winding assembly disposed on one side of the support frame, and a testing component mounted on the winding assembly. The winding assembly includes a winding rod and a movable rod. A pulley and a drive motor mounted on the bottom of the pulley are disposed at the bottom of the winding rod. The drive motor is mounted inside the support frame. This utility model uses a flaw detector (such as an ultrasonic flaw detector) to test the waterproof membrane. This flaw detector utilizes the principle of ultrasonic waves propagating in different media and reflecting at interfaces, accurately measuring the thickness of the membrane without damaging it. This avoids the inaccurate test results caused by traditional testing methods that damage the outer surface of the membrane and have difficulty controlling the degree of damage. It can accurately measure the thickness of the membrane and detect internal defects such as bubbles and cracks, greatly improving the comprehensiveness and accuracy of the testing.

The present application relates to the technical field of separation membrane, and in particular to a metal ring water channel membrane, a preparation method and application thereof, wherein after introducing a metal ring compound into a base membrane structure by using an interface polymerization technology, the microstructure of the base membrane can be effectively controlled, and a metal ring water channel membrane is successfully constructed. According to SEM verification, the thickness of the metal ring water channel membrane is about 163 nm, which is obviously thinner than the thickness of the base membrane without introducing the metal ring compound. The thinning of the base membrane thickness is beneficial to reducing the water molecule transmission resistance, and thus the water flux can be significantly improved. Meanwhile, through the synergistic effect of the metal ring compound and the base membrane, the interception performance of the base membrane can be optimized, and efficient selective interception of different types of dye molecules is realized. The test results of the membrane separation performance show that after introducing the metal ring compound into the base membrane, the water permeation efficiency is greatly improved, and the interception efficiency of various types of dye molecules is not reduced, and the synergistic balance of high flux and high interception rate is successfully realized.

The application discloses a kind of high-stability MOF membranes and its preparation and gas-liquid separation application.First, dense MIL-140s seed layer is deposited on porous support;Then it is placed in precursor liquid containing metal source and organic ligand, and gradually fills the gap between seed layer by coordination reaction of metal source and organic ligand through certain period of thermally induced growth, finally forming continuous well anastomosed MIL-140s membrane layer;Gas (liquid) body separation test shows that MIL-140s membrane has excellent gas-liquid separation performance.It is particularly pointed out that changing thermally induced growth temperature can significantly control and optimize MIL-140s membrane microstructure (such as crystal orientation, membrane thickness, intercrystalline defect, etc.), thereby changing MIL-140s membrane separation channel size and corresponding separation system.The above research results are expected to realize the directional design and controllable optimization of MOF membrane microtopography and separation performance, and have good industrial application prospect.

The application relates to a cellulose composite virus-removing membrane and a preparation process thereof. The composite virus-removing membrane comprises a microporous membrane support layer and a cellulose layer. A region for capturing 40nm colloidal gold in the virus-removing membrane is D 40 The membrane layer junction is taken as a position with a membrane thickness of 0%, the liquid inlet surface is taken as a position with a membrane thickness of -100%, and the liquid outlet surface is taken as a position with a membrane thickness of 100%. A region with a membrane thickness of -10% to 0% is a pre-retention region. The absorption peak height of D 40 gradually increases in the pre-retention region. The absorption peak of D 40 is the highest in a region with a membrane thickness of 1% to 40%. The application further discloses a preparation process of the composite virus-removing membrane. The composite virus-removing membrane has a pre-retention region for the 40nm colloidal gold retention capacity, and the retention peak value is controlled to be in the cellulose layer, so that the pre-retention region has the impurity retention capacity but does not cause concentrated impurity retention. The composite virus-removing membrane not only has high pressure resistance, but also has high loading capacity.

The invention relates to a microsensor (10) for measuring a measurement variable, having: an edge region (14) which surrounds a free region (16) and is formed by multiple individual anchor elements (18) which are laterally offset with respect to one another perpendicularly to a normal direction (22) and each extend with a width (20) and a length (60) greater than the width (20) through a layer structure (24) formed in the normal direction (22); and also having at least one membrane (26) which is self-supportingly connected to the anchor elements (18) with a uniform membrane thickness (28) and, depending on the measurement variable, can be deflected into the free region (16) in the normal direction (22), starting from a membrane edge (32) formed by the connection (30) and extending along the connection (30) to the anchor elements (18), wherein, in the normal direction (22), the individual anchor elements (18) each have a uniform width (20) and a uniform length (60) along all of at least one first layer (36) of the layer structure (24) adjacent to the membrane (26) in the normal direction (22), and wherein, along their respective lengths (60), the anchor elements (18) are oriented parallel to the membrane edge (32) adjacent to the anchor elements (18) and / or at least at an edge section of the membrane edge (32) form an edge contour (68) forming a non-linear membrane edge (32).

The utility model relates to the technical field of waterproof coiled material production, in particular to a waterproof coiled material thickness measuring device, which is characterized in that when the waterproof coiled material thickness measuring device is used, a worker flatly lays a cut waterproof coiled material to be measured on a bottom plate and then rotates a two-way screw rod, and because the lower end of a movable block is abutted against and in sliding fit with the upper surface of the bottom plate, the thickness of the waterproof coiled material is measured; under the action of threaded connection, the two movable blocks can relatively move close to each other or away from each other, that is, the movable blocks can drive the mounting plate to synchronously move, the mounting plate drives the flattening pressing plate to synchronously move, and a gap is reserved between the flattening pressing plate and the bottom plate; the flattening pressing plate can be tightly attached to the waterproof coiled material, folding or edge warping of the waterproof coiled material is prevented, errors of measurement results are avoided, measurement accuracy and flattening performance are guaranteed, the waterproof coiled material thickness detection device is suitable for thickness detection of various waterproof coiled materials with different thicknesses, and reliability and consistency of the measurement results are guaranteed.

The application provides a hydrogen and methane separation method. The separation method comprises: carrying out membrane separation on mixed gas containing hydrogen and methane through a hollow carbon molecular sieve membrane, preferably, the pore size of the hollow carbon molecular sieve membrane is 0.3-0.9 nm, the hollow carbon molecular sieve membrane has a bimodal distribution of 0.35+ / -0.05 nm and 0.5+ / -0.05 nm pore size, and / or the membrane thickness of the hollow carbon molecular sieve membrane is 20-30 microns; and / or the diameter of the hollow carbon molecular sieve membrane is 160-230 microns; the carbon source for preparing the hollow carbon molecular sieve membrane is microcrystalline cellulose or cellulose acetate, preferably microcrystalline cellulose. The application separates the mixed gas containing hydrogen and methane by using a multi-stage hollow carbon molecular sieve membrane, and high molar concentration hydrogen can be obtained to meet the subsequent hydrogen terminal process requirements.

The invention relates to a method for regulating and controlling a cardiolipin-containing membrane structure by utilizing mid-infrared light and application, and belongs to the field of biophysical regulation and control. The method comprises the following steps: applying a mid-infrared electric field with specific frequency and intensity to the mitochondrial-like phospholipid bilayer membrane system containing cardiolipin, and triggering the change of membrane structure parameters and cardiolipin behaviors of the mitochondrial-like phospholipid bilayer membrane system. The method comprises the following steps: constructing a mitochondrial membrane model through CHARMM-GUI, applying alternating electric fields with different frequencies and intensities by using a GROMACS platform, analyzing by combining indexes such as membrane thickness, cardiolipin orientation angle and cardiolipin density distribution, and determining 53.04 THz and 53.16 THz as characteristic frequencies of cardiolipin; 0.7 V / nm is determined as the optimal intensity. The mid-infrared light non-contact operation is adopted, the method has the advantages of being high in frequency selectivity and reversible in regulation and control, moderate change of the membrane structure can be caused under the specific frequency and proper electric field intensity, and a theoretical basis is provided for light regulation and control of the mitochondrial function, drug delivery and disease intervention.

The present application relates to the field of membrane separation, in particular to a self-repairable ultra-thin polymer / hollow fiber composite membrane module and a preparation method thereof, the present application proposes to bind the hollow fibers on the center tube in a "bundling type", to establish a standardized membrane coating production line, to carry out orthogonal cross test on the polymer coating liquid coating process of different materials based on the membrane preparation process of differential pressure pore permeation method, to unify the corresponding membrane preparation parameters, to carry out rapid gas blowing and other post-treatment processes after the coating is completed, so as to realize relatively uniform membrane thickness and dense and defect-free membrane layer, and to avoid the blockage of the inner cavity of the hollow fiber; at the same time, after the crosslinking agent is reacted with the polymer chain amide, a large number of carboxyl groups will still remain on the crosslinking agent, so that the new chemical crosslinking reaction of carboxyl and amino group, carboxyl and carboxyl occurs under a certain temperature and time, so as to realize the self-repair of the membrane layer defects, and the self-repair still maintains good separation performance.

The present disclosure relates to a fluid-applied membrane for radon mitigation in construction applications. It is disclosed a fluid-applied membrane for radon mitigation in construction applications comprising a fluid composition comprising a paraffin-based hydrophobic phase forming a continuous matrix after curing; at least one polymeric binder selected from a list comprising: acrylic, styrene-acrylic, ethylene-vinyl acetate or hydrocarbon resins, or their combinations, and mineral fillers, with a density greater than 3.5 g / cm3, selected from a list comprising: barite, hematite, magnetite, tungsten powder, bismuth powder or combinations thereof, wherein the viscosity of the fluid composition ranges from 0.5 Pa.s to 5 Pa.s at 20°C, interacting with radon gas to prevent radon migration primarily by diffusion resistance and barrier continuity; wherein the fluid-applied membrane thickness, after curing at ambient temperature, ranges from 0.5 mm and 10 mm; wherein the cured membrane exhibits a radon gas diffusion coefficient of 1×10-13 m2 / s or lower, thereby acting as a diffusion barrier preventing radon migration from a sub-floor region into habitable spaces.

The application relates to the technical field of gas separation, in particular to an asymmetric copolyimide membrane and a preparation method and application thereof. The asymmetric copolyimide helium separation membrane with a selection layer thickness of 300 nm is prepared by optimizing casting solution conditions and using a non-solvent induced phase separation technology. The membrane is dense in the outside and porous in the inside, the helium permeability reaches 87 GPU, the membrane thickness is reduced by one order of magnitude compared with a self-supporting membrane, the membrane also has good gas separation selectivity, the membrane also has good gas separation performance when the helium feed composition is changed, and the membrane also has excellent impurity resistance and stable separation performance when impurities C2H6 and CO2 are introduced.

The invention relates to a microsensor (10) for measuring a measured quantity, comprising an edge region (14) surrounding a free region (16) and formed by several individual anchor elements (18) that are laterally offset from one another perpendicular to a normal direction (22) and each extend with a width (20) and a length (60) greater than the width (20) through a layer structure (24) built up in the normal direction (22), at least one membrane (26) which is cantilevered to the anchor elements (18) with a uniform membrane thickness (28) and which, in the normal direction (22), is deflectable into the free region (16) from a membrane edge (32) formed by the connection (30) and along the connection (30) to the anchor elements (18) in the normal direction (22), depending on the measured quantity.wherein the individual anchor elements (18) have a uniform width (20) and uniform length (60) in the normal direction (22) completely along at least one first layer (36) of the layer structure (24) adjacent to the membrane (26) in the normal direction (22), wherein the anchor elements (18) are aligned with their respective length (60) parallel to the membrane edge (32) adjacent to the anchor elements (18) and / or form a non-linear membrane edge contour (68) at least at an edge section of the membrane edge (32).

The application discloses a PTFE bacteria-removing filter membrane and a preparation method and application thereof. The filter membrane comprises a main body, a first outer surface and a second outer surface of the main body are substantially symmetrical, surface nodes and surface fibers for forming a porous structure are included on the outer surfaces of the filter membrane, and the adjacent surface nodes are connected through the surface fibers. The IPA bubble point of the filter membrane is 0.12-0.35 MPa. The thickness of the filter membrane is 30-80 microns. The SEM average width of the surface fibers is 80-350 nm, and the SEM average length of the surface fibers is 0.9-2.5 microns. Under the joint action of the suitable membrane hole size, the suitable membrane thickness size, the suitable membrane structure and the suitable length and the suitable coarse fiber of the surface fibers, the sufficient interception of bacteria is ensured, the ideal bacteria capturing effect is realized, and a large flux is obtained. The filter membrane also has high mechanical strength, can bear high pressure during filtration, has strong stability and long service life. The filter membrane is used for liquid bacteria removal and / or gas bacteria removal, and has a wide application range.

The invention belongs to the technical field of pet snack food processing, and particularly relates to a preparation method of a flowing-core egg yolk ball for pets. The preparation method comprises the following five core steps: emulsifying and preparing a core body, preparing a film-forming solution, instilling to form a film, toughening and sealing, and hydrophobic anti-sticking and shaping, namely emulsifying, stirring at a low speed, refrigerating and standing to obtain a flow core body by taking food-grade liquid egg yolk of pets as a core body raw material, crosslinking and forming a film by using sodium alginate and calcium lactate, toughening by using chitosan, and sealing by using flaxseed powder. The thickness of the cross-linked membrane is less than or equal to 0.02 mm, and the total thickness of the cross-linked membrane and the sealing layer is less than or equal to 0.06 mm. By means of pet-age differential parameter design, when the pet eats, a membrane can be broken, the membrane is not splashed after being broken, a core body slowly flows out, the effects of storage and transportation extrusion resistance, easiness in being bitten by the pet, flow center stability and intestine and stomach friendliness are considered, the process is simple, the adaptability is high, and the method is suitable for industrial production.

A substrate for a composite membrane includes a microporous polyolefin membrane for carrying a hydrophilic resin compound within the pores of the microporous membrane wherein: the average pore diameter is 1 nm to 50 nm; the porosity is 50% to 78%; the membrane thickness is 1 μm to 12 μm; and, when a mixed solution of ethanol and water (volume ratio 1 / 2) is dripped onto a surface of the microporous polyolefin membrane which has not undergone hydrophilization treatment, the contact angle θ1 between the droplet and the surface is 0 to 90 degrees 1 second after the dripping, and the contact angle θ2 between the droplet and the surface is 0 to 70 degrees 10 minutes after the dripping, and the rate of change of the contact angle ((θ1−θ2) / θ1×100) is 10 to 50%.