157 results about "Porous thin films" patented technology

The invention belongs to the field of advanced materials, and particularly relates to super-flexible and ultrathin hybrid glass and a low-temperature large-area preparation method thereof, and the hybrid glass comprises the following raw materials: oligomeric silsesquioxane, inorganic nanoparticles and a high-molecular polymer porous film. The ultra-flexible and ultra-thin hybrid glass prepared by the invention can be processed and formed at room temperature or lower temperature, compared with the existing commercial ultra-thin glass, the flexibility of the ultra-thin hybrid glass is remarkably improved, the ultra-thin hybrid glass is thinner, the problem that the traditional glass is fragile and the technical challenge in a thinning process are overcome, and the ultra-flexible and ultra-thin hybrid glass has good application prospects. The electronic equipment can be lightened and thinned, and the service life of the electronic equipment can be prolonged.

The invention discloses a natural polysaccharide assisted MXene porous membrane electrode and a preparation method thereof, and relates to the technical field of electrodes. According to the technical scheme, hydrochloric acid and lithium fluoride are used for carrying out etching and intercalation on an MAX raw material, and MXene dispersion liquid is obtained; mixing the MXene dispersion liquid with a metal ion solution to obtain a metal ion doped MXene solution; mixing the metal ion doped MXene solution with a natural polysaccharide dispersion liquid to obtain a natural polysaccharide modified MXene dispersion liquid; mixing the natural polysaccharide modified MXene dispersion liquid with a template substance, performing vacuum filtration, and performing vacuum drying to obtain a flexible MXene film; and carrying out template substance removal treatment on the flexible MXene film to obtain the natural polysaccharide-assisted MXene porous film electrode. According to the invention, the stacking problem of the MXene material is solved, and the electrochemical performance of the natural polysaccharide-assisted MXene porous membrane electrode is obviously improved.

The present application discloses a PMMA coated diaphragm and its preparation method and application, which relates to the technical field of secondary batteries. It comprises a base film, which is a porous film; a coating, which is arranged on at least one side of the base film, and comprises small-particle PMMA and large-particle PMMA, wherein the large-particle PMMA is embedded between the small-particle PMMA, and the large-particle PMMA is formed by demulsification and agglomeration of small-particle PMMA. It solves the problems of low liquid storage and poor air permeability of the diaphragm coated with small-particle PMMA in the prior art, and powder shedding of the large-particle PMMA coating.

The invention provides a diaphragm, a preparation method thereof and a battery, the diaphragm comprises a porous film, a sensor is embedded in the porous film, and two sides of the porous film are respectively provided with a coating layer; the coating layer is one or both of an oxide and a polymer. The sensor is integrated into the battery diaphragm, so that the detection accuracy of the battery state is higher, the problem can be found at the initial stage of a battery fault, and a hysteresis phenomenon is avoided; the material / structure and the like of the battery cell are not influenced, and the battery cell is not damaged; irreversible damage to the sensor is avoided, and the sensitivity, the accuracy and the stability of the sensor are guaranteed.

The present invention relates to the technical field of perovskite cells, and in particular to a method for preparing a perovskite film, a film, a perovskite cell, and a stacked cell. The preparation method comprises: preparing a buried substrate; the buried substrate comprising an alkali metal formate; forming a porous film containing a compound having a general chemical formula of BX2 on the buried substrate; and reacting the compound having a general chemical formula of BX2 in the porous film with a compound having a general chemical formula of AX to obtain a perovskite film; wherein B is a metal cation; A is an organic amine cation or an alkali metal cation; and X is a halogen ion or a pseudohalogen anion. Under the combined action of the alkali metal ions and the formate ions, the metal halide film forms a well-oriented porous film, and the pores in the porous film serve as channels for the organic amine cations or alkali metal cations to enter the metal halide film, allowing the metal halide within the porous film to fully react.

A boron-doped graphene composite solid-state electrolyte and its preparation and application. A mixed solution of polyacrylonitrile (PAN) and N,N-dimethylformamide is prepared into a PAN porous film using electrospinning technology. A PEO casting solution is prepared by mixing boron-doped graphene, polyethylene oxide, lithium bis(trifluoromethanesulfonylimide), and acetonitrile. This solution is then cast onto the PAN porous film and, after vacuum drying, forms a composite solid-state electrolyte with polyacrylonitrile fibers as a support, polyethylene oxide as a matrix, and boron-doped graphene as a filler. The composite solid-state electrolyte prepared by the present invention has high ionic conductivity and lithium ion transference number, providing lithium batteries with good rate performance and cycle stability.

The invention discloses a flexible organic field effect transistor respiratory ammonia sensor using modified graphene oxide nanosheets and a preparation method of the flexible organic field effect transistor respiratory ammonia sensor, and belongs to the technical field of gas sensors. The organic light emitting diode sequentially comprises a flexible substrate, a grid electrode, a flexible dielectric layer, an organic semiconductor layer and a source electrode / drain electrode from bottom to top, and raw materials of the organic semiconductor layer comprise poly [(dithiophene)-alternating-(2, 5-bis (2-octyldodecyl)-3, 6-bis (thienyl)-diketopyrrolopyrrole)], an elastomer and modified graphene oxide. The nano material OA-GO containing multiple functional groups has an adsorption effect on target gas, the porous film containing the OA-GO is prepared, the surface area in contact with the gas is increased, more binding sites can be exposed, and finally high-sensitivity and high-selectivity detection of the target gas NH3 is achieved.

The invention discloses a coated defluorination composite material based on a microbial mineralization technology and a preparation method thereof. According to the coated defluorination composite material, urease vaterite calcium carbonate particles are used as a material core part, and the outer surface of the core part is coated with a calcium cross-linked porous composite film to serve as a coating layer of the material; the calcium cross-linked porous composite membrane is a porous membrane material formed by cross-linking calcium ions and a porous matrix, and the porous matrix is selected from any one of chitosan, cellulose, sodium alginate and porous silicon; the urease vaterite calcium carbonate particles are generated in situ after urea hydrolysis is catalyzed by urease and a calcium source is added. The composite material has the advantages of efficient defluorination effect and good stability when used in fluorine-containing wastewater, and the preparation method of the coated defluorination composite material is simple and easy to implement.

The invention provides a porous radiation refrigeration flexible film as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing a NaCl saturated aqueous solution with ethanol, then carrying out ultrasonic treatment on the mixed solution, then centrifugally collecting NaCl to separate out crystals, and drying to obtain superfine NaCl particles; and (2) mixing a PDMS precursor with a curing agent to obtain a PDMS mixed solution, mixing the PDMS mixed solution with the superfine NaCl particles, pouring the mixture into a mold, curing, immersing in a water bath to remove NaCl, and drying to obtain the porous radiation refrigeration flexible film. NaCl particles with small particle size and narrower particle size distribution are prepared by adopting an ultrasonic precipitation method; the porous PDMS film prepared by taking the NaCl particles as a sacrificial template has a better radiation refrigeration effect.

The invention relates to the technical field of aerogel materials, in particular to a four-side elastic aerogel thermal insulation material and a preparation method thereof. The invention relates to a four-side elastic aerogel thermal insulation material, which comprises the following substances by weight: 20-30 parts of TPU resin; and 0.5 to 2.0 parts of ethyl silicate. According to the preparation method, TPU resin and ethyl silicate are preferably selected as main materials, TPU is taken as a spinning aid, ethyl silicate is taken as a silicon source, different proportions of ethyl silicate are added in the TPU drying process, the TPU enters a screw rod for melt spinning after being dried, and the porous thin film material is prepared by adopting rotor spinning. And soaking the film in absolute ethyl alcohol, adding a catalyst to prepare gel, and performing super-hydrophobic and nitrogen dioxide supercritical drying to prepare the elastic aerogel film. The elastic aerogel thermal insulation material prepared by the method disclosed by the invention has high transverse and longitudinal elasticity and air permeability, does not drop powder and has good thermal insulation performance.

The invention discloses a method for preparing a porous light thin film by using MXene powder and MXene slurry, which comprises the following steps: step 1, mixing MXene dispersion liquid with absolute ethyl alcohol, and carrying out spray drying on the mixed liquid to obtain hollow microsphere MXene powder; 2, weighing MXene powder, adding the MXene powder into the MXene slurry, and uniformly mixing the MXene powder and the MXene slurry; and step 3, taking the MXene composite slurry, coating the surface of the hydrophilic film with the MXene composite slurry, and stripping after the MXene composite slurry is naturally dried to obtain the porous light MXene film. The light porous film prepared from the MXene slurry and the MXene powder internally contains a large number of MXene hollow spheres (the diameter is 5-10 microns), the density is 0.1 g / cm < 3 >, the porosity is 95%, the morphology of the hollow microspheres does not change after water is added, and the spherical morphology can be kept in the film processing process.

The present invention discloses a low-detection-limit MEMS acetylene gas sensor and a preparation method thereof, which includes respectively preparing a SiO2-Si3N4 double-layer composite film on the front and back surfaces of a Si substrate; depositing an insulating layer on the front composite film, using self-assembled monolayer SiO2 microspheres as a template, cooperating with radio frequency sputtering of metal oxide SnO2, and preparing a SnO2 porous film by ultrasonically removing the SiO2 microspheres in acetone. On this basis, Au is evaporated by electron beam evaporation technology, and heat treatment is carried out to form agglomerated particles; a sensitive electrode and a lead pad, a heating electrode and a lead pad are obtained on the front surface of the silicon wafer, and a back groove is etched to obtain a sensor with an adiabatic groove. The Au nanoparticles modified SnO2 porous film has high consistency, fast sensor response speed and low power consumption, meeting the requirements of ultra-low detection limit and volume limitation in acetylene detection.

Embodiments relate to a method of forming a nanoporous thin film. The method can involve co-sputtering SiO2 and a sacrificial porogen to form a sacrificial porogen: SiO2 composite film onto a substrate. The method can involve annealing the sacrificial porogen: SiO2 composite film to form an annealed sacrificial porogen: SiO2 composite film. The method can involve dissolving at least a portion of the sacrificial porogen from the annealed sacrificial porogen: SiO2 composite film.

The invention provides a blood brain barrier bionic micro-fluidic chip device, and belongs to the technical field of bionic chips. The system comprises a concentration gradient generation module and a blood brain barrier bionic module. A concentration gradient generation module chip of the concentration gradient generation module is of a tree-shaped structure, and the concentration gradient of the medicine is generated through a multiple dilution method; according to the module, the uniform concentration gradient is formed at the outlet by accurately controlling the drug concentration, and the intervention effect of the drug on the disease can be researched according to the dose-effect relationship in one experiment. The blood-brain barrier bionic module comprises an upper-layer chip and a lower-layer chip which are separated by a porous film, and the upper-layer chip simulates a blood vessel end of a blood-brain barrier; and the lower-layer chip simulates a brain end. The design partially reproduces the cell structure and function of the blood-brain barrier, and allows researchers to establish a more effective blood-brain barrier model in vitro.

The invention relates to a chlorine dioxide sustained-release ball, which relates to the technical field of environmental protection and disinfection, and comprises an activated alumina ball and an inorganic porous layer from inside to outside, wherein the activated aluminum oxide ball is loaded with sodium chlorite and a porous film, and the inorganic porous layer is loaded with the porous film. The chlorine dioxide sustained-release ball disclosed by the invention realizes the goals of high load, long period, constant-speed release and stable physical form.

The invention discloses an immersed heat dissipation structure based on porous film evaporation phase change, and belongs to the field of chip heat dissipation, and the structure comprises a heat dissipation module which is used for bearing a server assembly and providing a heat exchange environment; the condensation module is used for converting electronic fluorinated liquid steam generated by partial heat dissipation of the case into electronic fluorinated liquid; the filtering module is used for filtering and purifying the electronic fluorination liquid converted by the condensing module to remove impurities in the electronic fluorination liquid; the liquid storage module is used for storing the electronic fluorination liquid purified by the filtering module and providing the electronic fluorination liquid for a heat dissipation loop; the pressurizing module is used for providing power for the electronic fluorinated liquid; and the control module is used for collecting and processing parameter data of temperature, pressure and flow in the heat dissipation loop and adjusting the parameter data according to preset values. By the adoption of the structure, the problems that the cost is high due to the fact that the heat dissipation critical heat flux density of an existing two-phase immersed server case is low and the demanded quantity of fluorinated liquid is large, and the operation reliability of a server is affected by pressure fluctuation are solved.

The invention discloses a piezoelectric electro-catalysis-adsorption integrated porous thin film material as well as a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing CdIn2S4, Bi (NO3) 3.5 H2O and Na2MoO4. 2H2O in an organic alcohol solvent, reacting at 120-160 DEG C for 12-24 hours, and drying to obtain a CdIn2S4 / Bi2MoO6 heterojunction; s2, dispersing the heterojunction in an organic solvent, adding polyacrylonitrile and polyvinylpyrrolidone, and heating and stirring to form a solution A; adding a pore forming agent polyvinylpyrrolidone into the amidoximation modified polyacrylonitrile to obtain a solution B; mixing and stirring the solution A and the solution B to obtain a membrane casting solution; and S3, blade-coating a substrate with the membrane casting solution, immersing into water, and curing to form a membrane. According to the invention, integration of piezoelectric catalysis, photocatalysis and selective adsorption functions in a three-dimensional porous film structure is realized.

The invention relates to a method for preparing a dielectric material for a friction nanogenerator in the technical field, comprising the following steps: step 1: adding manganese carbonate powder and a curing agent to PDMS, and stirring evenly to obtain a slurry for standby use; step 2: applying the slurry evenly to a film mold, and drying to obtain a composite film; step 3: soaking the composite film in a dilute hydrochloric acid solution to obtain a porous film, and then washing the porous film with water and drying it; step 4: soaking the porous film in a 0.2 mol / L to 0.5 mol / L dopamine hydrochloride solution for 48 to 72 hours to obtain a hydrophilic film, and then washing the hydrophilic film with water and drying it. The process for preparing a dielectric material for a friction nanogenerator according to the invention is simple, low in cost, easy to operate, and the prepared film is colored, and its consumption degree can be intuitively observed when used.

The present invention relates to the technical field of solar cells, and relates to a solar cell based on a core-shell structure charge transport layer and a preparation method therefor. The solar cell comprises a conductive substrate, and a porous charge transport layer, a porous spacer layer, and a porous back electrode layer which are sequentially deposited on the conductive substrate, wherein at least one of the porous charge transport layer, the porous spacer layer, and the porous back electrode layer is further filled with a photoactive material, and the porous charge transport layer is a porous film formed by a composite charge transport material having a core-shell structure. In the present invention, a common charge transport material is replaced with a composite structure of a porous core-shell charge transport layer for bulk phase conduction and surface charge extraction, so that efficient charge extraction at a perovskite interface can be realized, and efficient carrier transport in a bulk phase can be ensured. The use of some wide-bandgap materials, such as silicon dioxide, as an ultra-thin tunneling layer can further effectively passivate a surface defect, thereby suppressing interfacial carrier recombination without affecting charge extraction.

The present invention belongs to the technical field of hydrogen sensors, and in particular, is a sensor suitable for testing hydrogen gas concentrations above 1%. The present invention is aimed at the difficulty of semiconductor-based gas sensors in sensing high-energy concentration hydrogen. Considering that precious metals such as palladium, gold, and platinum have selective adsorption of hydrogen and catalytic overflow effects on hydrogen, the activation energy of the reaction is reduced, and the synergistic effect of precious metals and semiconductors is used to increase the upper limit of hydrogen detection. A porous tin oxide or indium oxide porous film doped with precious metals is prepared as a semiconductor sensor device for detecting high-concentration hydrogen. The semiconductor high-concentration hydrogen sensor can detect hydrogen gas with a concentration of more than 1%, and has good reusability.

The present invention belongs to the technical field of porous film material preparation, specifically relating to a high-strength polyamide reverse osmosis membrane and its preparation method. A small amount of amine monomer is added to the casting solution, an initiator is added to the coagulation bath, and the amine monomer is polymerized during phase inversion to form a modified base membrane. This improves the base membrane's amine absorption capacity and enhances the bond between the base membrane and the desalination layer. Modified layered mineral clay kaolin is added during interfacial polymerization to provide water channels while improving the membrane's mechanical properties and desalination performance. The resulting composite polyamide nascent membrane is immersed in a strong alkaline solution. Drying and heating the modified kaolin and the strong base trigger an alkali-thermal activation effect, generating a partial molecular sieve, which enhances the reverse osmosis membrane's adsorption capacity and provides additional water channels, further improving the membrane's desalination rate. The resulting membrane has a flux of no less than 25 GFD and a desalination rate of no less than 99.5%. After abrasion resistance testing, scratches on the membrane surface are shallow, and repeated performance changes are minimal.

An adhesive structure (100) comprises a porous thin film (11) formed from an epoxy-based resin, in which pores are formed by a porous framework, and an adhesive (13) is impregnated into the pores of the porous thin film (11). This configuration not only allows for sufficient reduction of thermal stress but also achieves excellent adhesion.

The application discloses a kind of optical fiber humidity sensor and its preparation scheme, optical fiber humidity sensor includes micro-nano optical fiber and porous film;Wherein: the micro-nano optical fiber, at least one bending part is formed;The porous film is coated on the surface of the bending part;The porous film surface has a plurality of holes, which is configured to be able to swell by water absorption, so that the duty cycle of hole becomes smaller.The present application utilizes the evanescent field of U-shaped micro-nano optical fiber to couple with the porous film to realize humidity sensing.Under different relative humidity environment, the size of the hole of the porous film on the surface of the U-shaped micro-nano optical fiber is different, so that the size of the energy scattered by it is different, and the change of the optical power at the output end of the optical fiber is different, thereby realizing humidity sensing.The present application has the advantages of high sensitivity, fast response speed, high repeatability and stability.

To provide a porous film having both of thinness and air permeability.SOLUTION: The porous film has an air permeability (S) of less than 10 seconds / 100cc and a bubble point pressure (PBA) of 5 to 80kPa, wherein the content of the styrene-based elastomer (B) is 20% by mass or more and less than 50% by mass based on the total amount of the polyolefin (A) and the styrene-based elastomer (B).SELECTED DRAWING: None

The invention discloses a wearable molecular imprinting sensor and application thereof in cortisol detection, and belongs to the technical field of electrochemical analysis and detection. The molecular imprinting sensor sequentially comprises a sweat absorbing pad, a three-electrode system, an annular polydimethylsiloxane mold and a medical bonding patch from the skin contact surface to the outside, the front surface of the sweat-absorbent pad is in contact with the skin, and KCl and K3 [Fe (CN) 6] are adsorbed on the back surface of the sweat-absorbent pad; the three-electrode system takes an MIP / AuNWs / PET sensor as a working electrode, a platinum wire as a counter electrode and a silver / silver chloride electrode as a reference electrode; the annular polydimethylsiloxane mold and the medical adhesive patch form a sweat collection chamber. The molecular imprinting sensor based on in-situ growth of gold nanowires (AuNWs) on the porous PET film is used for rapidly detecting the cortisol level in human sweat in real time, natural receptor ligand interaction is simulated through the molecular imprinting technology, and high-specificity recognition of cortisol is achieved.

The present invention discloses a method for preparing a semiconductor light-emitting device, which relates to the semiconductor field. The method comprises: providing a sapphire substrate; performing conventional cleaning on the sapphire substrate and then depositing a porous SiO2 film thereon; placing the sapphire substrate with the porous SiO2 film deposited thereon into an ICP reaction chamber for dry etching to form multiple V-shaped holes on the surface of the sapphire substrate; depositing a porous cubic boron nitride transition layer on the side of the sapphire substrate where the V-shaped holes are formed; and growing a gallium nitride epitaxial layer to obtain a fully structured epitaxial wafer. This method can improve the crystal quality of the GaN material, reduce dislocation density, and effectively increase the luminous efficiency of LED devices.

To provide a recycled plastic material that enables production of a thin film and a composite woven fabric having waterproof and moisture-permeable capabilities.SOLUTION: The present invention provides a recycled plastic material, wherein a resin raw material comprises a plastic depolymerized product including a first monomer having a structure represented by HO-Rx-OOC-Ph-COO-R'x-OH and a second monomer having a structure represented by HO-Rx-OOC-HN-R-NH-COO-R'x-OH, a polyether polyol, a polyisocyanate, and a solvent. Ph represents a benzene ring. Rx and R'x are each independently selected from -CH2CH2-, -CH2CH2OCH2CH2-, -(CH2CH2O)n- and -(CH2CH2O)nCH2CH2-. n is 6 to 23. R is selected from diphenylmethanediyl, toluenediyl, or a specific cyclic compound.SELECTED DRAWING: None

The present application belongs to the technical field of fluorescent anti-counterfeiting label, and particularly relates to a polymer porous film for fluorescent pattern transfer and a preparation method and application thereof. The polymer porous film comprises a porous film prepared by photopolymerization, and at least one active functional group is patterned and modified on the surface of the porous film through ATRP reaction, and at least one fluorescent molecule is connected to the active functional group through a covalent bond. The present application further provides a fluorescent anti-counterfeiting label transferred by the above polymer porous film. The polymer porous film and the fluorescent anti-counterfeiting label prepared therefrom have the advantages of simple preparation method, strong designability of patterns, reliable anti-counterfeiting effect and multi-waveband response, and have a good application prospect.

The present invention discloses a metal oxide semiconductor porous thin film, a preparation method thereof and a gas sensor. The preparation method includes the steps of continuously heating a provided substrate and maintaining it at a first preset temperature, transferring a first predetermined volume of a metal-organic framework precursor solution onto the substrate, and then performing a first calcination. After cooling, a thin film precursor is prepared on the substrate. Continuously heating the substrate with the thin film precursor on its surface and maintaining it at the first preset temperature, transferring a second predetermined volume of the metal-organic framework precursor solution onto the thin film precursor, and then performing a second calcination to prepare the metal oxide semiconductor porous thin film on the substrate. The preparation method provided by the present invention has a simple preparation process, good film-forming quality, high efficiency, environmental friendliness, low cost, and can achieve continuous large-area production. The obtained thin film has a small contact resistance between oxide particles, excellent electronic conductivity and excellent gas sensing performance.

The present application relates to a kind of functional tubular composite fabrics of heat and moisture transfer, including the core layer of high modulus and heat insulation by high modulus heat insulation rigid composite material and heat insulation thermal cotton;Highly elastic cladding layer is formed by continuous silica gel, spiral structure yarn that can be filled with liquid and gas;Transport layer of liquid is formed by waterproof and moisture-permeable porous membrane that is engraved with micropore on surface, water delivery hose, heat conducting film, heating wire;Waterproof and moisture-permeable skin layer is formed by elastic woven fabric layer, hydrophobic porous film layer and porous nonwoven fabric layer.The tubular composite fabric of the present application can be used to make warm body dummy artificial limb, such as warm body dummy arm, warm body dummy leg, etc., simple to make, when used as warm body dummy artificial limb, it is more convenient to test by partition, can be used for silk stockings, jumpsuit, socks, gloves, ice sleeve and other clothing comfort test.