107 results about "Nanotube membrane" patented technology

A carbon nanotube film structure includes at least two overlapped carbon nanotube films, with adjoining films being aligned in different directions. Each carbon nanotube film includes a plurality of successive carbon nanotube bundles aligned in the same direction. The carbon nanotube structure further includes a plurality of micropores formed by/between the adjoining carbon nanotube bundles. A method for fabricating the carbon nanotube film structure includes the steps of: (a) providing an array of carbon nanotubes; (b) pulling out, using a tool, one carbon nanotube film from the array of carbon nanotubes; (c) providing a frame and adhering the carbon nanotube film to the frame; (d) repeating steps (b) and (c), depositing each successive film on a preceding film, thereby achieving at least a two-layer carbon nanotube film; and (e) peeling the carbon nanotube film off the frame to achieve the carbon nanotube structure.

An electrode for an electro-optic device according to an embodiment of this invention has a network of carbon nanotubes. The electrode has an electrical conductivity of at least 600 S/cm and a transmittance for 550 nm light of at least 80%. An average thickness of the network of carbon nanotubes is at least 2 nm. A method of producing a device according to an embodiment of this invention includes forming a film of carbon nanotubes on a filter surface by vacuum filtration, pressing a stamp against at least a portion of the film of carbon nanotubes to cause a portion of the film of carbon nanotubes to adhere to the stamp, and pressing the stamp having the portion of carbon nanotubes adhered thereto against a substructure of the device to cause the network of carbon nanotubes to be transferred to a surface of the substructure upon removal of the stamp.

Certain applicator liquids and application techniques are described, which can be used to form nanotube films or fabrics of controlled properties. An applicator liquid for preparation of a nanotube film or fabric includes a controlled concentration of nanotubes dispersed in ethyl lactate. The controlled concentration is sufficient to form a nanotube fabric or film of preselected density and uniformity.

This invention relates to heterogenous pore polymer nanotube membranes useful in filtration, such as reverse osmosis desalination, nanofiltration, ultrafiltration and gas separation.

The invention relates to a carbon nanotube film. The carbon nanotube film comprises a plurality of carbon nanotubes which are basically parallel with one another and are arranged basically parallel to the surface of the carbon nanotube film, wherein the carbon nanotube film has resistance anisotropy, and the sheet resistance of the carbon nanotube film is of megohm level in the direction vertical to the carbon nanotube arrangement. The invention also provides a carbon nanotube composite film, which comprises a polymer substrate and the carbon nanotube film in the polymer substrate, wherein the carbon nanotube film comprises a plurality of carbon nanotubes which are basically parallel with one another and are arranged basically parallel to the surface of the carbon nanotube film; the carbon nanotube film has resistance anisotropy, and the sheet resistance of the carbon nanotube film is of megohm level in the direction vertical to the carbon nanotube arrangement. The megohm level carbon nanotube film or the carbon nanotube composite film can be applied in the fields of transparent electrodes, thin film transistors, touch screens and the like.

A method for making a variable-density carbon nanotube film is provided. A drawn carbon nanotube film, including a number of carbon nanotubes aligned along an aligned direction, is prepared. A number of thin regions are formed in the drawn carbon nanotube film along the aligned direction by reducing density of carbon nanotubes in each of the plurality of thin regions. A variable-density carbon nanotube film is provided and includes a number of thin regions and at least one normal region having a density of carbon nanotubes greater than that of the thin regions. The at least one normal region includes a number of carbon nanotubes substantially aligned along an aligned direction. The thin regions are arranged in the form of at least one row extending along the aligned direction.

The invention discloses a doped graphene flexible transparent electrode and a preparation method thereof. The doped graphene flexible transparent electrode consists of a flexible transparent substrate and doped graphene which is arranged on the flexible transparent substrate and is doped with heterogeneous atoms and molecules. The doping methods of graphene comprise non-substitutional doping, substitutional doping and composite doping. By using the graphene which grows through chemical vapor deposition (CVD) as raw materials, realizing the doping of the heterogeneous atoms and molecules of the graphene by chemical means and using the doped graphene to construct the flexible transparent electrode, the prepared doped graphene flexible transparent electrode has excellent properties of low resistance, high light transmittance and high bendability. The square resistance of the electrode reaches 3-500ohm/sq, the light transmittance reaches 87.4-97.6 percent, and the doped graphene flexible transparent electrode is superior to the existing transparent electrodes which are prepared by using indium tin oxide (ITO), carbon nanotube films and the like.

The invention discloses an integrated stress monitoring method for a carbon nanotube film/composite material, and the method comprises the steps: preparing a carbon nanotube alignment film; cutting the carbon nanotube alignment film into U-shaped toothed sensors according to the demands; carrying out the recombination of the prepared carbon nanotube film stress sensors and resin, and forming a carbon nanotube alignment film prefabricated body through precuring; carrying out the laying of the composite material, enabling the carbon nanotube alignment film prefabricated body to be laid on the upper and lower surfaces of a composite material prepreg, and forming a carbon nanotube film composite material which can be used for stress monitoring; connecting an electrode material, carrying out the online monitoring of stress, applying the stress to the composite material in various types of loading modes, recording the change of a resistance instrument, and calculating the real-time change of the stress. According to the invention, the prepared carbon nanotube film composite material stress sensors can effectively monitor various types of stress on the composite material, are quick in response, are high in sensitivity, and avoid the impact from multidirectional stress caused by the Poisson effect of the sensors. Meanwhile, the piezoresistance characteristics of carbon nanotubes can be played in a better way through traction alignment.

A method for stretching a carbon nanotube film includes providing one or more carbon nanotube films and one or more elastic supporters, attaching at least one portion of the one or more carbon nanotube films to the one or more elastic supporters, and stretching the elastic supporters.

The invention discloses self-supporting CNT (Carbon Nano-Tube) film-faradaic pseudocapacitance composite material and a preparation method thereof. A CNT film participates in reaction by being used as a self-supporting continuous base body, the wall of a single CNT or the surface of a CNT bundle in a network structure of the CNT film is compounded with material with good faradaic pseudocapacitance performance, and the faradaic pseudocapacitance material comprises MnO2, Ni(OH)2 and PANI. According to the preparation method disclosed by the invention, the process is simple, and the defects of tedious technology and the like of a traditional electrode coating preparation method are overcome; and a prepared composite thin film has the advantages of large mechanical strength and good electrical conductivity, has excellent ductility and flexibility, is flexible electrode material and has a great application prospect in fields of a super capacitor and the like.

The invention discloses a continuous preparation method for a cylindrical carbon nanotube macroscopic body, and a method and apparatus for preparing a pure carbon nanotube film in an opened atmosphere system based on the macroscopic body, and belongs to the technical field of nanometer materials. The method comprises the following technological steps: dissolving ferrocene and thiophene in a hdydrocarbon composed of carbon and hydrogen elements, or an alcohol, ketone or carboxylic acid compound composed of carbon, hydrogen and oxygen elements, or a mixed solution of the hydrocarbon and the alcohol, ketone or carboxylic acid compound, bringing the above mixed solution into a high-temperature tubular furnace by an inert gas, performing catalytic cracking in the furnace tube, synthesizing the carbon tube and forming the cylindrical carbon nanotube macroscopic body through combination, and continuously blowing out by the furnace tube. A roller for spinning a film is put at the furnace tail, the roller is paved with a substrate film wetted by a solidification liquid, and thus the cylindrical carbon nanotube macroscopic body is orderly wound around the substrate film, and the film is formed through shrinkage. The substrate film is reserved or removed according to needs. The multifunctional carbon nanotube film is prepared in the opened system. Equipment is simple, and industrialized large-scale production can be realized.

A carbon nanotube film includes a plurality of carbon nanotubes. The plurality of carbon nanotubes is arranged approximately along a same first direction. The plurality of carbon nanotubes are joined end to end by van der Waals attractive force therebetween. The carbon nanotube film has a uniform width. The carbon nanotube film has substantially the same density of the carbon nanotubes along a second direction perpendicular to the first direction. The change in density across the width is within 10 percent. The present application also relates to a carbon nanotube film precursor and a method for making the carbon nanotube film.

The invention discloses a reverse osmosis membrane, a preparation method and application thereof. The reverse osmosis membrane comprises a porous filter membrane supporting layer, a carbon nanotube membrane middle layer and a polyamide membrane selection layer which are arranged in sequence. According to the invention, the reverse osmosis membrane is a stable composite membrane integrating a porous filter membrane, a carbon nano tube membrane and a polyamide membrane, wherein the porous filter membrane serves as the substrate loaded by the carbon nano tube membrane and provides good mechanicalstrength, the carbon nano tube membrane has uniformly distributed nano-sized apertures and high porosity, and is used as a support for an interfacial polymerization reaction so as to achieve uniformdistribution of a monomer solution and controllable release of a monomer to prepare an ultrathin and high-quality polyamide membrane, and the polyamide membrane as a performance determination layer has the characteristic of ultra-thinness, and makes the novel reverse osmosis membrane have the flux far higher than that of the traditional reverse osmosis membrane while retaining the high rejection rate. According to the reverse osmosis membrane disclosed by the invention, the carbon nano tube membrane middle layer with uniformly distributed nano-sized apertures and high porosity is introduced for the first time, so that the performance is substantially improved.

The invention discloses a carbon nano tube film load cuprum and palladium bimetallic catalyst, a preparation method and an application. The catalyst takes cuprum and palladium as catalytic activity ingredients, and carbon nano tube film modified titanium plate as a substrate. The preparation method comprises the steps of pretreating the titanium plate and a carbon nano tube respectively, taking the treated titanium plate as an anode, taking a dispersed carbon nano tube suspension as deposition liquid, depositing the carbon nano tube on the titanium plate uniformly by the electrophoresis action to form a dense carbon nano tube film, taking the dried carbon nano tube film modified titanium plate as the substrate, placing the substrate in a sodium chloride electroplating solution containing cupric ions, palladium ions and polyvinylpyrrolidone, synchronously depositing the cuprum and the palladium by an electrochemical reduction method, and obtaining the titanium-based carbon nano tube film load cuprum and palladium bimetallic catalyst. The catalyst has high and stable electrochemical activity and electro-catalytic properties, and can serve as a working electrode to degrade organic dye in a water body and reduce inorganic negative ions such as nitrate, bromate and chromate.

Techniques for increasing conductivity of carbon nanotube films are provided. In one aspect, a method for increasing conductivity of a carbon nanotube film includes the following steps. The carbon nanotube film is formed from a mixture of metallic and semiconducting carbon nanotubes. The carbon nanotubes are exposed to a solution comprising a one-electron oxidant configured to dope the semiconducting carbon nanotubes to increase a conductivity thereof, thereby increasing the overall conductivity of the film. The step of forming the carbon nanotube film can be performed prior to the step of exposing the carbon nanotubes to the one-electron oxidant solution. Alternatively, the step of exposing the carbon nanotubes to the one-electron oxidant solution can be performed prior to the step of forming the carbon nanotube film. A method of fabricating a transparent electrode on a photovoltaic device from a carbon nanotube film is also provided.

A method for making a carbon nanotube film structure is related. A rotator having an axis and a rotating surface is provided. A carbon nanotube film drawn from a carbon nanotube array is adhered on the rotating surface of the rotator. The rotator is rotated about the axis to wrap the carbon nanotube film on the rotating surface of the rotator to form a carbon nanotube layer. The carbon nanotube layer is cut along a direction to form the carbon nanotube film structure.

The invention discloses a method for preparing a titanium dioxide (TiO2) nanotube membrane with two permeable ends of a nanotube thereof. The method for preparing the titanium dioxide nanotube membrane comprises the following steps of: firstly, generating a titanium dioxide membrane with a required thickness on the surface of a titanium substrate material in a mode of electrolytic oxidation; secondly, thinning a barrier layer at the bottom of the titanium dioxide nanotube membrane by adopting gradual voltage-lowering oxidation; and finally, applying a high-voltage pulse higher than an anode oxidation voltage to continue oxidizing after finishing the last process until the titanium dioxide nanotube membrane with two permeable ends is shed from the substrate.