499 results about "Porous thin films" patented technology

A method of producing a porous thin-film-deposition substrate, which has the steps of: placing onto a substrate that has an electrostatic charge on its surface, fine particles with a surface electrostatic charge opposite to the electrostatic charge of the substrate surface, depositing a thin film on the fine-particle-placed substrate, and then removing the fine particles to form fine pores in the thin film; further, a method of producing an electron emitting element, which has the steps of: adding a catalyst metal on a substrate, placing fine particles onto the catalyst-added substrate, depositing a thin film on the fine-particle-placed substrate, then removing the fine particles to form fine pores in the film, and growing needle-shaped conductors on the catalyst metal that is exposed on a bottom face of the fine pore.

The invention discloses a porous film and a preparation method of the porous film, which can easily achieve high porosity and guarantee the formability during the preparation, and are simple and practical in preparation process. The thickness of the porous film is 200-1500[mu]m, the average aperture of the porous film is 0.05-100[mu]m, and the porosity of the porous film is 25-75%. The preparation method includes (1) acquiring a support film which has a porous first material, and forming primary pores in the first material; (2) preparing slurry containing a powder-like second material; (3) coating the support film with the slurry to prepare a base substrate; (4) sintering the base substrate, generating a porous third material through the reaction between the first material and the second material during the sintering, and further generating secondary pores communicated with the primary pores; and (5) cooling the base substrate to obtain the porous film after the sintering. The porous film at least contains the primary pores and the secondary pores, so that the porous film is easy to achieve high porosity.

The invention discloses a porous thin film and a preparation method for the porous thin film which are easy to achieve the high porosity, guarantee the possible formability in preparation and are simple and practical in preparation technology. The thickness of the porous thin film is 5-200Mum, the average pore size is 0.05-100Mum, and the porosity is 25-75%. The preparation method comprises the steps that 1, a support film is obtained, the support film is provided with a porous-shaped first material, and preliminary pores are formed in the first material; 2, a slurry is prepared, and the slurry contains a powdered second material; 3, the support film is coated with the slurry and then made into a rough-body; 4, the rough-body is sintered, auto-reaction happens to the second material in sintering, a porous third material is generated, and then secondary pores communicated with the preliminary pores are generated; 5, the porous thin film is obtained by cooling after the sintering. Due to the fact that at least the preliminary pores and the secondary pores are contained, the high porosity of the porous thin film is easy to achieve.

The energy density of the entire cell may be improved while retaining high power density by use of an alkali metal transition metal polyanion compound as the cathode and a thin film metal or metalloid anode. The thin film anode may be initially unalloyed or partially unalloyed. During use, the thin film anode may be only partially unalloyed relative to the theoretical maximum. The high volumetric capacity of the metal anode makes it possible to use a dense or porous thin film anode in conjunction with a relatively thin particle-based cathode to thereby improve the energy density of the cell.

Disclosed is a porous film comprising: (a) a porous substrate having pores; and (b) a coating layer formed on at least one region selected from the group consisting of a surface of the substrate and a part of the pores present in the substrate, wherein the coating layer comprises styrene-butadiene rubber. An electrochemical device using the porous film as a separator is also disclosed. The porous film is coated with a styrene-butadiene polymer, whose rubbery characteristics can be controlled, and thus provides improved scratch resistance and adhesion to other substrates. When the porous film is used as a separator for an electrochemical device, it is possible to improve the safety of the electrochemical device and to prevent degradation in the quality of the electrochemical device.

The invention discloses a mesoscopic solar cell based on a perovskite-kind light absorption material. The mesoscopic solar cell comprises a glass substrate, a transparent conductive layer, a hole blocking layer, an electron transport layer and a back electrode; and the hole blocking layer is a compact layer, the electron transport layer is a porous thin film, a porous electron blocking layer is further disposed between the electron transport layer and the back electrode, and the electron transport layer and the electron blocking layer are filled with the perovskite-kind light absorption material. Or the mesoscopic solar cell comprises a glass substrate, a transparent conductive layer, a hole transport layer and a back electrode; and the hole transport layer is a porous thin film, a compact electron blocking layer is further disposed between the hole transport layer and the transparent conductive layer, and the hole transport layer is filled with the perovskite-kind light absorption material. The invention further discloses a preparation method of the mesoscopic solar cell. The cell has optimized structure, the filled perovskite material in mesoporous is more, morphology is good, charge transmission performance is improved, cell photoelectric conversion efficiency is greatly improved, and long-term illumination stability of the cell is substantially improved.

Provided are a method of fabricating a porous thin film structure, by forming a thin film from at least two elements, followed by selectively removing the certain element using a dry etching process, and a porous thin film structure fabricated by the same. Because all processes of the method of fabricating a porous thin film structure are dry processes, process control is simply accomplished, environmental impact is low, and mass production is possible, in contrast to when using a typical wet process such as electrodeposition or dealloying. Also, since a level of porosity is easily controlled and maintained uniform, a mesoporous thin film structure showing a reproducible level of sensitivity when used as a sensor can be fabricated.

A preferred embodiment biosensor is a multi-layer micro-porous thin film structure. Pores in a top layer of the micro-porous thin film structure are sized to accept a first molecule of interest. Pores in a second layer of the micro-porous thin film structure are smaller than the pores in the top layer and are sized to accept a second molecule of interest that is smaller than the first molecule of interest. The pores in the second layer are too small to accept the first molecule of interest. The pores in the top layer and the pores in the second layer are sized and arranged such that light reflected from the multi-layer micro-porous thin film structure produces multiple superimposed interference patterns that can be resolved. In preferred embodiments, the multi-layer micro-porous thin film structure is a porous silicon thin film multi-layer structure formed on a silicon substrate, such as a silicon wafer. Specific and nonspecific binding can be detected with biosensors of the invention. The position of peaks in the Fourier transform of the reflection spectrum and the shift in peak amplitudes can be used to determine the presence and quantity of targeted biological molecules of interest.

In a secondary battery including a positive electrode, a negative electrode and a porous film bonded to the surface of at least one of the positive electrode and the negative electrode, the porous film includes ceramic particles and a binder, and the ceramic particles include polycrystalline particles obtained by mechanically crushing a fired material comprising a ceramic that is directly synthesized from a ceramic precursor. The porous film has a porosity of 40 to 80%, for example. The porous film can be formed by a method including the steps of: obtaining a fired material comprising a ceramic from a ceramic precursor; obtaining ceramic particles by mechanically crushing the fired material of the ceramic; obtaining a slurry including the ceramic particles and a binder; and applying the slurry onto the surface of an electrode, followed by drying.

A separator-electrolyte layer product for use in a lithium battery, comprising: (a) a porous thin-film separator selected from a porous polymer film, a porous mat, fabric, or paper made of polymer or glass fibers, or a combination thereof, wherein the separator has a thickness less than 500 μm; and (b) a non-flammable quasi-solid electrolyte containing a lithium salt dissolved in a liquid solvent up to a concentration no less than 3 M; wherein the porous thin-film separator is coated with the quasi-solid electrolyte so that the layer product exhibits a vapor pressure less than 0.01 kPa when measured at 20° C., a vapor pressure less than 60% of the vapor pressure of the liquid solvent alone, a flash point at least 20 degrees Celsius higher than a flash point of the first liquid solvent alone, a flash point higher than 150° C., or no detectable flash point.

Wound dressings and wound inserts comprising a porous film layer and at least a channel, wound inserts of forming wound inserts comprising a porous film layer and at least a channel, and wound-treatment wound inserts.

The invention belongs to the organic film preparation field, and relates to a preparation method of porous low-dielectric polyimide thin films. The method includes the following steps: (1) preparation of a reinforcing filler suspension; (2) preparation of a polyamide acid compound solution; (3) preparation of polyimide thin films; and (4) obtaining of the porous polyimide thin films. Calcium carbonate is used as a pore-forming agent raw material, the calcium carbonate is removed by dilute hydrochloric acid to obtain the porous thin films, raw materials are simple and are easy to obtained, and complex operations are not needed; at the same time, the pore size and porosity of the thin films can be controlled directly through control of the particle size and content of the calcium carbonate, and various porous low-dielectric polyimide thin films with excellent performance are prepared, can be applied in substrate materials of electrician and electronic industries and are especially suitable for electronic materials of large-scale integrated circuits.

Disclosed is a porous film made of a resin composition containing (I) (i) a propylene-ethylene copolymer or (ii) a polypropylene-based resin mixture containing a propylene-ethylene copolymer, each having an ethylene content of 3.0 to 7.0 wt. % and an MFR measured at 230° C. of 2.0 to 4.0 g/10 min and (II) a β-crystal nucleating agent; the film having a porosity of 20 to 80%, a Gurley air permeability of 5,000 sec/100 cc or lower as measured according to JIS P-8117, a water vapor permeability of 2,000 g/m²·24 h or higher as measured according to JIS Z-0208 and a water pressure resistance of 75 kPa or higher as measured according to JIS L-1092 using an aqueous surfactant solution; a process for producing the same; and an absorbent article employing the porous film as a backsheet.

The invention discloses an organic/inorganic composite porous thin film and an electrochemical energy storing device using the same. The organic/inorganic composite porous thin film comprises a porous organic base material and an active layer attached on the porous organic base material, wherein the active layer comprises inorganic particles and a binder, and the inorganic particles are one or mixture of sulfate, phosphate, metal fluoride and lithium salt. The organic/inorganic composite porous thin film is adopted as an isolating film for the electrochemical energy storing device. Compared with the prior art, the organic/inorganic composite porous thin film takes substances which do not react with hydrofluoric acid as the inorganic particles of the active layer, and therefore, the electrochemical energy storing device adopting the organic/inorganic composite porous thin film has the advantages of good circulating storage performance, high voltage resistance performance and safety performance.

A method of forming a nanoporous film is disclosed. The method comprises forming a coating solution including clusters, surfactant molecules, a solvent, and one of an acid catalyst and a base catalyst. The clusters comprise inorganic groups. The method further comprises aging the coating solution for a time period to select a predetermined phase that will self-assemble and applying the coating solution on a substrate. The method further comprises evaporating the solvent from the coating solution and removing the surfactant molecules to yield the nanoporous film.

A flow diverter is described and fabricated using ultra-thin porous thin-film Nitinol, and is configured for implantation to a treatment site within a vessel for significant reduction in an intra-aneurismal flow velocity and vorticity. Using small size pores in a coverage area of only 10%, a 90% reduction in flow velocity into a pseudo-aneurysm can be achieved, with an almost immediate cessation of flow into an anatomical feature such as aneurysm sac in vivo. The size of the holes can be tailored to be any shape and range in size from 1-400 μm using photolithography and from 5-1000 nm using ebeam lithography.

An apparatus and a method are provided for manufacturing an electrode of hydrous ruthenium oxide thin film. The apparatus comprises an injector for introducing a precursor solution and spraying the precursor solution; a substrate having the precursor solution sprayed thereon; a substrate-supporting base for supporting the substrate and including a halogen lamp therein for heating the substrate; a direct current power supply connected to the substrate-supporting base and the injector; a distance adjuster for adjusting the distance between the substrate-supporting base and the injector; and a temperature controller for controlling the substrate-supporting base. Under a strong electric field, the ruthenium precursor solution is sprayed, to yield a porous thin film electrode having very fine particles. The electrode prepared by the method which is advantageous in terms of simplified preparation process and shorter period of time required for preparation, compared to conventional methods, has more excellent properties than those of a conventional ruthenium oxide electrode for super capacitor or a composite electrode of ruthenium oxide and activated carbon.

The invention discloses a preparation method of a porous film. The preparation method comprises the following steps: (1) acquiring a porous support body; (2) preparing a thick size containing raw material powder, a binder, a dispersant and a pore forming agent; (3) loading the size onto the porous support body, and drying to make a film billet; (4) sintering the film billet to make a porous film precursor; (5) removing the pore forming agent from the precursor to obtain a porous film with the thickness of 5-3,000 [mu]m, the average aperture of 0.05-100 [mu]m and the porosity of 40-90%. The preparation method has the following advantages: firstly, no chemical reaction occurs between the pore forming agent and the raw material powder, so that the ingredients of the porous film cannot be damaged; secondly, the pore forming agent is excellent in thermal stability and always occupies a certain space (place) in the sintering process; after sintering, the pore forming agent is removed, holes or pores are generated in situ; therefore, the whole technological process is simple, the hole structure of the porous film is easy to control, and the porosity is remarkably improved.

The invention relates to a composite electrolyte of a sandwich structure and a preparation method thereof. The technical problems of poor interface performance and low conductivity of the existing all solid electrolyte are solved. The composite electrolyte comprises a porous thin film and a composite solid electrolyte material, the porous thin film is adhered on two sides of the composite solid electrolyte material, the porous thin film is composed of a high-molecular polymer, and the porous thin film adsorbs liquid electrolyte. The invention further provides a preparation method of the composite electrolyte. The composite electrolyte can be widely applied to the field of preparation of electrolyte.

The invention provides methods for modifying one or more properties of porous thin films. In such methods, a formulation comprising a reactive species is applied to the porous thin film and allowed to crosslink. In some embodiments, the crosslinked network thus formed imparts increased mechanical strength and wear resistance to the porous thin films.

The invention discloses a polyurethane porous thin film containing grapheme as well as a preparation method and application thereof. The preparation method comprises the following steps: adding polyurethane into a solvent for dissolution, adding a grapheme solution, adding a pore-foaming agent and obtaining a suspension after mechanical stirring for a certain time; performing vacuum de-foaming on the suspension, casting into a film on a mold, curing into a film in an anhydrous ethanol coagulation bath and then putting in deionized water for soaking, so that the pore-foaming agent is dissolved and completely removed; taking out a thin film and putting in an air blast baking oven for drying to obtain the polyurethane porous thin film containing the grapheme. The film can be used for artificial skin and has the advantages of being good in water and gas permeability, high in water absorption rate, excellent in mechanical property, good in biological affinity and the like.