207 results about "Nanocomposite thin films" patented technology

The invention provides a preparation method for graphene oxide with high barrier property and a polymer nanocomposite film. The preparation method comprises the following steps: graphene oxide is added in solvent for stirring to obtain a colloidal suspension of graphene oxide during the ultrasonic processing at the temperature of 20 to 45 DEG C; a polymer is added in the colloidal suspension of graphene oxide for stirring during the ultrasonic processing at the temperature of 20 to 120 DEG C, until the polymer is completely dissolved to obtain a solution of graphene oxide/polymer; and after air bubbles in the solution of graphene oxide/polymer are removed, the graphene oxide/polymer nanocomposite film is obtained by a casting method or blow molding method. The carbon dioxide transmission coefficient of the prepared nanocomposite film containing graphene oxide is reduced by more than 150 times, and the prepared nanocomposite film containing graphene oxide can be used for packaging food and drugs with higher requirements of barrier property.

An organic-inorganic hybrid nanocomposite thin film for a high-powered and/or broadband photonic device having an organic ligand-coordinated semiconductor quantum dot layer, a photonic device having the same, and a method of fabricating the same are provided. The organic-inorganic hybrid nanocomposite thin film is composed of a stack structure comprising a polymer layer and an organic ligand-coordinated semiconductor quantum dot layer self-assembled on the polymer layer, or composed of a first composite thin film comprising a first polymer layer pattern having a first hole, and an organic ligand-coordinated first semiconductor quantum dot layer pattern filling the first hole. The organic-inorganic hybrid nanocomposite thin film may be formed by spin-coating a semiconductor quantum dot solution and a polymer solution alternately to be stacked by one layer so as to form a multi-layered organic thin film composed of a plurality of layers. The hybrid nanocomposite thin film for a photonic device may be provided by physically coupling a high concentration and broadband semiconductor quantum dot layer and a polymer layer so as to realize a photonic device with high power, broadband, high brightness, and high sensibility, and a flexible photonic device may be also provided.

The invention discloses a method for synthesizing a graphene-containing composite thin film material. The method comprises: firstly, preparing a graphene oxide transparent thin film with uniform thickness by using graphene oxide colloidal suspension as a deposition medium; performing in-situ reduction on the graphene oxide thin film by an electrochemical process to obtain a graphene thin film; and finally, depositing uniformly-dispersed platinum nano particles on the surface of the obtained raphene thin film by a constant-potential depositing technique to obtain a platinum-graphene nano composite thin film. The catalytic behavior of the prepared composite thin film material on methanol is studied by using the prepared composite thin film material as an electrode. The experiment result proves that the composite thin film has remarkable catalytic effect on methanol.

The invention relates to a preparation method for a polyimide/oxidized graphene nanocomposite film, and belongs to the technical field of preparation of functional polymer materials. The preparation method comprises the following steps: performing ultrasonic even dispersion on the oxidized graphene in an organic solvent to obtain an oxidized graphene sheet suspension, wherein per ml of the oxidized graphene sheet suspension contains 1.3*10<-5>-1.3*10<-4>g oxidized graphene sheets; introducing nitrogen for carrying out deoxidization protection, adding diamine monomers into the suspension, mechanically stirring until full dissolution is achieved, adding dianhydride monomers, the moles of which are equal to that of the diamine monomers, in batches, and mixing for one to six hours under the ice bath conditions, so as to obtain polyamide acid/oxidized graphene composite solution; pouring the polyamide acid/oxidized graphene composite solution onto a die, removing the organic solvent, performing gradient temperature rise within 100-300DEG C, and carrying out thermal imidization to obtain the polyimide/oxidized graphene nanocomposite film.

The invention belongs to a preparation method of a functional polymer and relates to a preparation method of a polyether-ether-ketone/graphene oxide nano-composite film. The polyether-ether-ketone/graphene oxide nano-composite film is prepared by blending graphene oxide treated by a silane coupling agent, and sulfonated polyether-ether-ketone by a tape casting method, and has high strength and good anti-wear and friction reduction effects. The polyether-ether-ketone/graphene oxide nano-composite film obtained by the preparation method solves the problem of organic and inorganic interface dispersion caused by other preparation methods, and realizes organic/inorganic nano-material compounding in a molecular level. The preparation method has simple processes, is convenient for operation, can be industrialized easily, and has potential application values in fields of structural materials, friction materials, heat-resistant materials and barrier materials.

A self-assembly process for preparing luminescent organic-inorganic nanocomposite thin films is disclosed. A homogeneous solution in water and an organic solvent is obtained containing a soluble silicate, a silica coupling agent, a surfactant, and an organic material having a hole transport, electron transport, and/or emissive material moiety. The silica coupling agent is selected to chemically react with the organic material. A film of the homogeneous solution is deposited onto a substrate. Preferentially evaporating the organic solvent enriches the concentration of water and non-volatile solution components to promote micelle formation. Organic materials migrate into the hydrophobic portion of the forming micelles. Continued evaporation promotes self-assembly of the micelles into interfacially organized liquid crystalline mesophases. Reacting the organic material and silica coupling forms a nanostructure self-assembly. Luminescent ordered nanocomposite structures prepared by the process, and organic-inorganic HLED devices fabricated from the luminescent organic-inorganic nanocomposite structures are disclosed.

A humidity sensor element, a humidity sensor device and a method for manufacturing thereof are provided. The humidity sensor element includes a substrate having a nanocomposite film as sensing material, wherein said nanocomposite film consists of carbon nanotube/perfluorinated polymer with acid functional groups in weight ratio of 0.01-20; and at least a pair of electrodes, which contact with the sensing material at one or both side(s). The nanocomposite film increases the sensitivity of humidity sensor element such that even an infinitesimal amount of moisture can be detected with minimum detection limit of 15.76 ppm_v

The invention relates to a spraying method for preparing a graphene/polymer emulsion composite thin film material. The method is characterized by comprising the steps of reducing graphene oxide to obtain graphene; obtaining a stably-dispersed high-concentration graphene aqueous solution by adding a small amount of surfactants; and uniformly mixing with a polymer emulsion, and then spraying on a substrate to prepare a graphene/polymer emulsion nano composite thin film material with good conductivity. Compared with the prior art, the spraying method disclosed by the invention has the advantages of low cost, simple preparation process, no environment pollution, easily-realized large-scale industrial production, and the like.

The invention relates to a graphene composite thin film material and a preparation method thereof. The graphene composite thin film material is structurally characterized in that at least one graphene layer is arranged between two high molecular transparent thin films, and the high molecular transparent thin films are connected with the graphene layers and the adjacent graphene layers are connected with each other through a curing adhesive or a thermocuring adhesive. According to the invention, the defects on performance of the prepared graphene barrier composite materials are overcome in the prior art, and a nano composite thin film with high barrier property and high transmittance is prepared. The graphene high molecular composite thin film material prepared by the invention achieves both flexibility and high transparency, and the transmittance in a visible light area reaches up to over 85%. In addition, the composite thin film has excellent barrier property on water vapor and oxygen, solves the problem that water and oxygen barrier property of the prepared graphene/high molecular composite material in the prior art is poor, can satisfy the application demands on OLED (Organic Light Emitting Diode) apparatus encapsulation, medical and food packaging and the like, and has huge practical and promotional values.

The invention discloses a preparation method and application of a PDMS (polydimethylsiloxane)-magnetic nano-particle composite optical film, and belongs to the field of optical micro electro mechanical systems and polymer optical materials. The preparation method comprises the following steps: mixing a mixture consisting of a PDMS prepolymer and a curing agent with trichloromethane and magnetic nano-particles, and performing ultrasonic oscillation to obtain a PDMS-magnetic nano-particle mixed solution; and then coating the obtained PDMS-magnetic nano-particle mixed solution to a quartz plate by adopting a spin coating technology, obtaining an anisotropic composite material coated film under the action of a strong magnetic field of 500mT, and baking to obtain the PDMS-magnetic nano-particle composite optical film. The novel polymer based nano composite film with characteristics of a magneto-rheological elastomer is relatively high in optical transparency, and the optical transmittance of the film can be adjusted by applying an external magnetic field, so that the PDMS-magnetic nano-particle composite optical film is applicable in the field of the optical micro electro mechanical systems.

The invention relates to a waterborne polyurethane-MXene electromagnetic shielding bionic nanocomposite film and a preparation method. Through pre prepolymeriztion reaction of polytetrahydrofuran gl and diisocyanate and chain extension by a hydrophilic chain extender, then a neutralizing agent is added, subsequently, deionized water is added for emulsification dispersion to obtain a waterborne polyurethane emulsion; waterborne polyurethane and MXene are prepared into water dispersion liquid, MXene is added to the waterborne polyurethane under stirring, continuous stirring is carried out to enable waterborne polyurethane macromolecules to be fully and uniformly adsorbed on MXene nanosheets. And waterborne polyurethane-MXene composite dispersion liquid is obtained; and a series of nanocomposite films are prepared by a vacuum filtration method, a solvent evaporation method or a coating method. The prepared nanocomposite thin films have ordered "brick-wall" structures in a bionic shell layer shape on the micro and nano scales, the mechanical properties are excellent, the flexibility is good, the electromagnetic shielding effectiveness is excellent, preparation methods are diverse, thethickness is controllable, and application is wide.

A method for sensing a stimulus comprising providing a sensing assembly having a first structure and a second structure, wherein the first structure is made of a material different than the second structure and each of the first structure and the second structure is nanoscale. The method further includes providing an inductive antenna operably coupled to the sensing assembly, disposing the sensing assembly upon a spatial area, exposing the sensing assembly to the stimulus thereby producing a detectable change in the sensing assembly, and wirelessly coupling a reader with the inductive antenna to obtain a signal representative of the detectable change in the sensing assembly.

In one aspect, a method of making non-covalently bonded carbon-titania nanocomposite thin films includes: forming a carbon-based ink; forming a titania (TiO₂) solution; blade-coating a mechanical mixture of the carbon-based ink and the titania solution onto a substrate; and annealing the blade-coated substrate at a first temperature for a first period of time to obtain the carbon-based titania nanocomposite thin films. In certain embodiments, the carbon-based titania nanocomposite thin films may include solvent-exfoliated graphene titania (SEG-TiO₂) nanocomposite thin films, or single walled carbon nanotube titania (SWCNT-TiO₂) nanocomposite thin films.

The invention discloses a bipolar plate of a fuel cell and a method for preparing a carbon titanium nanocomposite film on the surface thereof, belongs to the technical field of surface modification of metallic materials and fuel cells, and relates to a bipolar plate of a regenerative fuel cell and a proton exchange membrane fuel cell and a preparation technology of a surface modified film of the bipolar plate. The bipolar plate consists of a metal thin plate substrate and carbon titanium nanocomposite films which are formed on the surfaces at two sides of the substrate, wherein the metal thin plate substrate is a titanium plate and a stainless steel plate; the carbon titanium nanocomposite film is an amorphous and nanocrystalline composite film which is prepared on an amorphous carbon substrate with an arc ion film plating method and on which titanium and titanium carbide nanocrystals are distributed; the thickness of the film is of micron dimension; and the size of the crystal grains of the nanocrystals is of micron dimension. The invention has the effects and advantages that: the bipolar plate is low in manufacturing cost, has prominent composite performance such as corrosion resistance, conductivity, hydrophobicity and the like, can be used for replacing a noble metal bipolar plate and a graphite bipolar plate, and can be used as a cell bipolar plate of the proton exchange membrane fuel cell and an electrolytic cell bipolar plate of the regenerative fuel cell.

The invention discloses novel electromagnetic shielding textile fabric and its preparation method and belongs to the field of textile processing. By a magnetron sputtering technology, nano-silver, nano-copper and nanometer titania particles are respectively sputtered onto a fabric base material to form an uniform nanocomposite film so as to obtain the electromagnetic shielding fabric. The electromagnetic shielding fabric for children's garments has advantages of simple preparation technology, low cost, high binding strength of the film and the base material, uniformly and compactly distributed film, strong adhesive force and no environmental pollution, and has excellent electrical conductivity and electromagnetic shielding performance. Resistance can be less than 10 omega/cm, SE value reaches about 28dB, and more than 99% of electromagnetic wave is shielded. By means of rapid heat-conducting property of metal, the fiber fabric can have effects of regulating body temperature and making the winter warm and the summer cool. In addition, the fabric feels very soft and has excellent resistance to water washing.

The invention provides a polyimide/rod-like clay nano-composite film and a preparation method thereof, which belong to the field of polymer materials. The composite film provided by the invention takes polyimide as a matrix and takes rod-like clay as a disperse phase, wherein the mass fraction of the polyimide matrix is 70 to 99.9 percent; the mass fraction of the rod-like clay is 0.1 to 30 percent; and the rod-like clay is sepiolite, attapulgite or a mixture of the two in arbitrary mixture ratio. The preparation method obtains the polyimide/rod-like clay nano-composite film by dispersing the rod-like clay in an organic solvent, adding diamine and dianhydride to the organic solvent, mechanically stirring the organic solvent for 1 to 3 hours at a temperature of between 0 and 30 DEG C, obtaining a polyimide/rod-like clay mixed solution, smearing a glass plate with the mixed solution to form a film, volatilizing the solvent and performing hot imidization. The preparation method is simple. The obtained composite film has the advantages of excellent mechanical properties, dimension stability, good thermal stability, chemical stability and the like.

The invention discloses a method for preparing a multi-element doped carbon-based nano composite film integrating functions of antiwear and lubrication. The carbon-based solid lubrication film is obtained on the surface of a metal workpiece by using a physical vapor deposition technology, the film thickness is 2.0-3.0 micrometers. Compared with a single metal doped diamond-like carbon-based composite film, the multi-element doped carbon-based nano composite film of the invention has high hardness (higher than 20GPa), low friction coefficient (the friction coefficient is 0.05-0.08), ultra low internal stress (lower than 1GPa) and excellent wear resistance (the wear resistance can be raised by 4-7 times). The multi-element doped carbon-based nano composite film can be used as a protective film integrating functions of antiwear and self lubrication, and is widely used in the precise machinery industry (bearings, gears, blades), engine industry (piston rings, piston pins, injection nozzles and the like), precise dies industry and the like.

The invention relates to a composite film heterojunction with magnetoelectric effect, which is formed by the compound of material with piezoelectric effect and material with magnetostrictive effect and characterized in that: the material with the magnetostrictive effect is a rare earth ferroalloy RFe2 nano film, wherein, R is a rare earth element; the material with the piezoelectric effect is a soft PVDF polymer piezoelectric film; the compound mode of the two films is that: the rare earth ferroalloy RFe2 nano film is deposited on the PVDF piezoelectric film to form a RFe2/PVDF double-layer nano composite film. The preparation method of the RFe2/PVDF double-layer nano composite film comprises the steps that: RFe2/PVDF nano-cluster beam current is continuously deposited on the surface of the PVDF piezoelectric film to form a RFe2 nano film layer. In the invention, the PVDF polymer film is a piezoelectric functional layer as well as the underlay of the RFe2 nano film layer. In the composite film heterojunction of the invention, interface stress transfer is more effective, thus having stronger magnetoelectric effect.

The invention provides a friction nano-generator. A friction layer of the friction nano-generator is composed of a nano-composite film, wherein the nano-composite film is formed by compounding a high-molecular polymer and a metal organic framework. The nano-composite film is used as a friction layer of the friction nano-generator, the output performance of the friction nano-generator is improved along with increase of humidity. The friction nano-generator is particularly suitable for being applied to a high-humidity environment, and the actual application range of the friction nano-generator is greatly widened.

The invention relates to a silicon-carbon nanocomposite film. The silicon-carbon nanocomposite film comprises an independent support structure and a carbon nanomaterial covering the independent support structure adopting porous silicon nanowire arrays. A preparation method of the silicon-carbon nanocomposite film comprises steps as follows: (1), a silicon wafer is etched by an etching liquid, and the porous silicon nanowire arrays are formed on the surface of the silicon wafer; (2), hydrocarbon is taken as a carbon source, inert gas and/or hydrogen are/is taken as carrier gas, and the carbon nanomaterial is deposited on the porous silicon nanowire arrays with a chemical vapor deposition method, so that the silicon-carbon nanocomposite film is formed on the silicon wafer; (3), the silicon-carbon nanocomposite film on the silicon wafer is peeled off in an aqueous alkaline solution. The silicon-carbon nanocomposite film can be obtained with a simple method and is taken as an anode material, so that the anode material has high capacity, stable circulation, long cycling life and actual application value.

The invention discloses a high-temperature-resistant dopamine-coated barium titanate/polyimide (BT@PDA/PI) dielectric nano composite film. The raw material is composed of 93-99vol% of polyimide (PI) as a matrix and 1-7vol% of dopamine-coated barium titanate nanoparticles (BT@PDA) as a filler, and the volume ratio of the barium titanate (BT) nanoparticles to dopamine (PDA) in the filler is (4-5):1;the preparation method comprises the following steps: reacting in an environment of a hydroxymethyl aminomethane buffer solution (Tris); coating BT nanoparticles with a dopamine hydrochloride solution to prepare BT@PDA nanoparticles with a core-shell structure, mechanically blending the BT@PDA nanoparticles with a PAA solution, defoaming a BT@PDA/PAA blending system in vacuum, coating to form a film, and carrying out high-temperature thermal imidization to obtain the composite dielectric film. According to the invention, the BT nanoparticles are coated by the dopamine layer; therefore, the distribution of BT particles in a PI matrix can be improved, the agglomeration among BT nano particles is reduced, the interface bonding among PI matrixes is enhanced, and the defects inside a compositematerial are reduced, so that the BT@PDA/PI nano composite film obtains excellent dielectric properties while maintaining good mechanical properties.

The present invention discloses a novel antibacterial textile fabric preparation method, and belongs to the field of textile processing, wherein nanometer silver particles and nanometer titanium dioxide particles are respectively sputtered on a fabric substrate through a magnetron sputtering technology, and the formed uniform nanometer composite film is covered on fibers so as to obtain the antibacterial fabric. The preparation process comprises: 1, carrying out a fabric pretreatment, wherein washing and drying are performed; and 2 sputtering nanoparticles, wherein the pretreated fabric substrate is placed onto a sample holder in the sputtering chamber, the distance between the target and the fabric substrate is 40-100 mm, a water cooling device is adopted to cool the substrate, the reaction chamber is evacuated to achieve the background vacuum, and high-purity argon gas with a volume fraction of 99.999% is introduced as the sputtering gas. According to the present invention, the method has characteristics of simple processing, easy control, low cost, high efficiency, energy saving, no pollution, and easy industrial production achieving; and the nanometer silver and the nanometer TiO2 are combined to prepare the antibacterial textile fabric so as to substantially improve the antibacterial property of the material and provide the new idea and new method for the preparation of the antibacterial fabric.

The invention discloses a method for preparing a BaFe12O and BaTiO3 multiplayer nano compound film/powder, which comprises the steps of preparing a transparent sol of BaFe12O19, a transparent sol of BaTiO3 and a compound sol of BaFe12O19 and BaTiO3 and the like, not only overcomes the defects existing in the conventional sol-gel process, but also prepares a wave absorbing material with light weight, wide frequency and thinness. The film prepared by the method has the advantages of fully having compound advantages, excellent comprehensive electromagnetic property, and doubling the wave-absorbing performance, along with smoothness, compactness and no crack. The nano compound film/powder of barium ferrite and barium titanate can also be used in the fields of magnetic records, drivers, switchers, sensors, microwave devices and the like, and due to the use of the nano compound film/powder, the property of the corresponding device, equipment or system can be greatly improved. The compound film/powder can replace a ferrite block, and the cost is greatly reduced.