592 results about "Nano composites" patented technology

The thermoelectric detector consists of an absorber structure supported by two electrically connected beams made of thermoelectric materials such as polysilicon, polysilicon/germanium, bismuth-telluride, skutterrides, superlattice structures, nano-composites and other materials. One end of the thermoelectric beam connects to the absorber structure; the other end connects to the substrate. Infrared radiation incident on the absorber heats up the absorber, resulting in a temperature gradient along the length of the thermoelectric legs, and generating an electrical voltage. The detector arrays are fabricated using micromachining process. The absorber structure is formed over a sacrificial material that is removed at the end of the processing, leaving the detector suspended and thermally isolated. The sacrificial processing method enables the production of small pixel thermoelectric detectors in large two-dimensional arrays with high sensitivity.

The invention discloses a graphene-based nano iron oxide composite material and a preparation method thereof. By the method, iron oxide nano granules with uniform diameter and controllable shape and components can be loaded on graphene. The method comprises the following steps of: uniformly dispersing graphite oxide into deionized water by adopting an ultrasonic method to obtain graphene oxide solution; adding an iron salt precursor into the obtained solution and mixing the precursor and the solution uniformly, adjusting the pH of the solution, and hydrolyzing the iron salt; putting the mixed solution into a reaction kettle and performing hydrothermal reaction; and finally, cleaning and freeze-drying the obtained product to obtain the graphene-based nano iron oxide composite material. The raw materials are common and easily obtained, the cost is low, and the preparation process is simple, safe and environmentally-friendly; the prepared graphene-based nano iron oxide composite material has good structural stability and monodispersity; when the composite material is used as a lithium iron battery electrode material, the charge/discharge capacity can reach over 1,000mAh/g; and the composite material has good multiplying power performance and cycle life.

The invention relates to a molybdenum disulfide-cadmium sulfide nanometer composite material and a preparing method thereof and an application of the molybdenum disulfide-cadmium sulfide nanometer composite material to water-photocatalytic-decomposition hydrogen production. The nanometer composite material comprises nanometer cadmium sulfide, and undefined-structure layered nanometer molybdenum disulfide growing on the nanometer cadmium sulfide in an in-situ mode. According to the nanometer composite material, the nanometer cadmium sulfide serves as a carrier; as the nanometer cadmium sulfide is of a nanometer structure, on one hand, the transmission path of electron holes can be shortened; on the other hand, as the specific surface area of the nanometer cadmium sulfide is large, the loading capacity of the molybdenum disulfide can be controlled. The molybdenum disulfide is in a layered shape and is of the undefined structure; when the molybdenum disulfide is used as a catalyst of water-photocatalytic-decomposition hydrogen production, a large number of active sites are provided for photoelectron and hydrogen ions in water reacting, and therefore the catalytic activity is improved. The molybdenum disulfide-cadmium sulfide nanometer composite material is used as the catalyst, and has the multiple advantages of being simple in method, low in cost, high in catalytic activity and the like.

The invention discloses a polypyrrole/graphene nano composite which belongs to the technical field of composites. In the invention, ethanol is taken as a medium, para-toluenesulfonic acid is taken as a surface active agent, polyethylene glycol-400 is taken as phase transfer catalyst, FeCl3*6H2O is taken as an evocating agent, and under ultrasound conditions, pyrrole monomers are polymerized in situ on graphene, so as to obtain the polypyrrole/graphene nano composite. In the composite of the invention, through analysis by electron microscopy, the pyrrole monomers are polymerized in situ and evenly cover the grapheme, and the graphene and the polypyrrole are tightly combined in a nano level; and thermogravimetric analysis and electric conductivity study show that the composite has better heat stability, electric conductivity and processability and can be used in the fields of sensors, electron devices and biomedicine.

The invention relates to a silver doped grapheme-zinc oxide nano composite photocatalytic material and a method for preparing the same and belongs to the technical field of nano composite materials and photocatalysis. Graphite oxide is subjected to ultrasonic dispersion to obtain a dispersion solution of graphene oxide; precursors of silver ions and zinc ions are added in the dispersion solution of the graphene oxide, and the mixture is placed into a reaction kettle to be subjected to hydro-thermal treatment to be prepared into the silver doped grapheme-zinc oxide nano composite photocatalytic material in situ after the pH is regulated to an alkaline condition. Photocatalytic degradation experiments show that the silver doped grapheme-zinc oxide nano composite photocatalytic material prepared through the method has good adsorption and visible light photocatalytic degradation effects on rhodamine B and is an ideal nano composite photocatalytic material.

The invention relates to a preparation method for cerium oxide/graphene oxide nanocomposite. The invention aims at providing a preparation method of cerium oxide/graphene oxide nanocomposite, and the preparation method is low in equipment requirement, simple to operate and fast in reaction speed, and is capable of saving energy consumption and uniformly dispersing metal nanoparticles on the surface of graphene. The method comprises the steps of: based on cerate, sodium acetate, urea and graphite oxide as raw materials, placing graphite oxide and water into a container, and carrying out ultrasonic treatment so that graphite oxide form a suspension in the water; placing cerate, sodium acetate and urea into the container for dissolving cerate, sodium acetate and urea into the water; and placing the container into a reactor with a backflow device for reaction until the reaction is finished, so as to obtain a black precipitate namely cerium oxide/graphene oxide nanocomposite.

The invention discloses a high-performance polypropylene nano composite material and a preparation method thereof, and belongs to the field of polymer modification and processing. The high-performance polypropylene nano composite material comprises the components in percent by weight: 39 to 98% of polypropylene, 1 to 15% organic clay, 0 to 30% of inorganic filling material, 0.1 to 6% of compatilizer, 0 to 20% of flexibilizer, 0.2 to 2% of stabilizer, and 0 to 4% of other additive. Through the cooperative modification of nanoscale organic clay and micron-sized talcum powder to polypropylene, a nano composite material with higher rigidity, higher tenacity and other performance is obtained at a lower material density.

The invention belongs to the nano-material technical sphere, especially it relates to a method for preparation of triplefunction carbon nano-tube used in epoxide resin nano-recombination. The invention adopts molecular design conception, namely that after the suface-definite quantity carboxylation and chloridization, the long-chain diamine with a character construction is introduced into the purified carbon nano-tube, then the grafted carbon nano-tube with a quantitative active amidol on surface is obtained. Making use of the chemical attraction of the construction to the base resin and the chemical reaction with the base resin, we can better the dispersibility of the carbon nano-tube and improve the basal binding strength with the base resin. At the same time the carbon nano-tube can exert multiple functions, for example, it is easy to disperse, its interfacial caking capacity is fine, and it is reinforced and solidified. So the obtained triplefunction carbon nano-tube used in epoxide resin nano-recombination is good to improve the bulk property of the carbon nano-tube/epoxide resin composite and is suitable for industrial use for carbon nano-tube.

The invention discloses a metal double-hydroxide/molybdenum disulfide nano-composite material and a preparation method and application of the metal double-hydroxide/molybdenum disulfide nano-composite material. Molybdenum disulfide is adopted in the metal double-hydroxide/molybdenum disulfide nano-composite material as supporting materials, and the larger superficial area and more active centers are provided for metal double-hydroxide. The preparation method of the metal double hydroxide/molybdenum disulfide nano-composite material is simple in step, has the advantages of being efficient and environmentally friendly, and is prone to achieving industrial operation.

The invention belongs to the field of nano composites and phase change composites, and particularly relates to a preparation method of a porous carbon based electrothermal phase change composite. According to the invention, with MOFs@MOFs as a template, a metal organic skeleton coats another metal organic skeleton containing catalytic metal elements (such as Co, Fe, Ni) by an in-situ synthesis method, three-dimensional carbon nanotubes penetrating through a porous carbon support are prepared by means of high-temperature calcination, and the phase change composite can be better matched a phasechange core material to be supported. The phase change composite effectively prevents the leakage problem, effectively overcomes the defect of low conductivity of an organic phase change material, hasthe advantages of high electrothermal conversion efficiency, high cycle stability and wide core material selection range, and thus has wide application prospects.

The invention discloses a graphene-polydopamine-copper nano-composite material and a preparation method thereof, and belongs to the field of nano-inorganic functional materials. The method includes the steps: taking graphene as a raw material, and enabling dopamine to automatically polymerize in buffer solution to prepare a graphene/polydopamine composite material; taking prepared graphene/polydopamine as a raw material, performing uniform dispersion in ethanol solution, adding copper salt, enabling mixture and reducing agents to react for 10-20min at the water bath temperature of 80 DEG C, performing centrifugal washing and drying to obtain the graphene/polydopamine/copper nano-composite material. According to the method, the dopamine serves as a modifying agent, so that the surface of the graphene is modified, copper nano-particles are uniformly dispersed on the surface of the graphene and directly reduced in the solution by the aid of the reducing agents, oxidation of the copper nano-particles can be effectively prevented, the preparation method is simple, and the obtained graphene/polydopamine/copper nano-composite material easily forms transfer films, has the functions of resisting abrasion and reducing friction and can serve as an effective lubricating additive.

The invention relates to a graphene/polypropylene conductive nano composite material and a preparation method thereof, belonging to the technical field of polymer nano composite materials. On the basis of 100 parts by mass, the graphene/polypropylene conductive nano composite material contains 92.5-97.5 parts by mass of polypropylene (as a base), 1-3 parts by mass of graphene (as a conductive filler) and 1.5-4.5 parts by mass of maleic anhydride grafted polypropylene (for promoting dispersion of the graphene); and the graphene/polypropylene conductive nano composite material is prepared by solution blending and hot pressing. A series of graphene/polypropylene conductive nano composite materials in different proportions can be obtained by changing the mass percent of the graphene in the composite system. The prepared graphene/polypropylene conductive nano composite material can be used in the fields of conductive materials, electromagnetic shielding materials, antistatic materials and the like.

The invention discloses a porous graphene/nickelous hydroxide/polyaniline composite electrode material and a preparation method thereof, belonging to the technical field of nano composite materials and electrochemistry. The composite electrode material is composited by porous graphene, nickelous hydroxide and polyaniline, and has a porous structure; the nickelous hydroxide is deposited on the porous graphene by the binding effect of holes; the polyaniline is combined with the surface of the graphene by pi-pi mutual effect and is deposited on the surface of the porous graphene. The particle diameter of the nickelous hydroxide is 20-150nm; the specific surface area of the porous graphene is 350-450m<2>/g, the conductivity is 20-60S.m-1, and the weight loss in the temperature of 900 DEG C is 4-6wt%. The obtained porous graphene/nickelous hydroxide/polyaniline composite electrode material has the advantages that the oxidation and reduction performances are good, the specific capacitance is up to 2480F/g, and after the charging and discharging circulate for 2000 times, the specific capacitance is maintained to be about 90% still.

The invention discloses a biomass carbon/molybdenum disulfide nano composite material and a preparation method thereof. The preparation method comprises the following steps of: preparing biomass carbon by a hydrothermal method and calcination, and then growing a petal-shaped molybdenum disulfide nano material on porous biomass carbon by a one-step hydrothermal method. The biomass carbon/molybdenum disulfide nano composite material prepared has the characteristics of good electrical conductivity, stable electrochemical performance and the like, and can be used as an ideal high-performance electrocatalytic hydrogen-producing material, a lubricating agent, a battery material, a catalytic material and a hydrogen storage material and the like. The preparation method is simple in operation, low in cost and wide in application prospect.

The invention relates to a method for preparing graphene, a method for carrying out graphene surface modification by taking one or more than two of pyrene, pyrene derivatives, naphthalene and naphthalene derivatives as a modifying agent as well as a method for manufacturing TiO2-graphene nano-composite material by utilizing the reaction of the surface-modified graphene and a titanium-containing compound and a product thereof. The method for preparing graphene comprises the steps of (a1) reducing dispersive graphite oxide in inert solvent by using a reducing agent to form a graphene-containing reaction mixture, wherein the reducing agent comprises sodium borohydride, vitamin C or combination thereof; and (a2) isolating graphene from the reaction mixture. The obtained graphene is flocculent and the TiO2-graphene nano-composite material has efficient photocatalytic performance.

The invention discloses a ferroferric oxide@carbon/reduced graphene oxide nano composite wave-absorbing material and a preparation method thereof. By using graphene oxide as a template, ferric chloride hexahydrate as a metal salt, terephthalic acid as an organic ligand, and N,N-dimethylformamide as a solvent, the ferroferric oxide@carbon/reduced graphene oxide nano composite material is prepared by a solvothermal-high temperature pyrolysis two-step method. The preparation method is environmentally friendly, generates no toxic by-products, and has a simple preparation process. The prepared nanocomposite material has a good microwave absorption capacity, a wide absorption frequency band, a low thickness, light weight and a low filling ratio, can absorb electromagnetic waves in different wavelength bands by adjusting the addition amount of graphene oxide in a precursor and the thickness of a coating layer, and has an important application value in the field of electromagnetic absorptionand electromagnetic shielding.

The invention relates to a preparation method of a graphene enhanced magnesium-based composite material, and relates to a preparation method of a nanometer composite material. The invention aims at solving the technical problem of nonuniform dispersion of the traditional graphene in a matrix metal. The preparation method comprises the following steps of 1, mixing graphene with an alcohol dispersant in absolute ethyl alcohol, chemically dispersing under an ultrasonic condition to obtain chemically dispersed graphene; 2, mixing the chemically dispersed graphene with Zn powder for ball milling to obtain Gra@Zn composite powder; 3, adding Gra@Zn composite powder to a semi-solid state Mg-Zn alloy fusant for mechanical stirring, then increasing temperature till liquid state, and stretching an ultrasonic rod below an alloy liquid level for ultrasonic dispersion treatment to obtain an alloy fusant; 4, pouring the alloy fusant into a preheated mould, and then solidifying so as to prepare the graphene enhanced magnesium-based composite material. The preparation method disclosed by the invention is applied to the field of preparation of the nanometer composite material.

The invention relates to a graphene/layered double hydroxide composite flame retardant and a preparation method of a polystyrene nanometer flame-retardant composite material. The preparation method comprises the following steps of: dissolving a carbon nanotube into graphene oxide colloid; stirring and performing ultrasonic dispersion until the materials are dispersed uniformly; adding M<2+> salt and Al<3+> salt; adding urea; performing a reflux reaction to obtain a graphene/carbon nanotube/layered double hydroxide composite assembling body; mixing the composite assembling body and polystyrene resin; and performing melt extrusion to obtain the polystyrene nanometer flame-retardant composite material. The graphene/carbon nanotube/layered double hydroxide composite assembling body is prepared by dispersing carbon nanotubes by a graphene oxide nanosheet, controlling the pH value of the solution by the urea and reducing the graphene oxide into the graphene. The polystyrene nanometer flame-retardant composite material prepared by the melt extrusion method has excellent flame resistance and mechanical properties.

This invention is nano recombination material. Exactly speaking, it's about original position preparation of nanometer silica dioxide/modified alkyd resin. In this invention, we adopt original position polymerization and supersonic auxiliatary decentralization to make sure we get nano powder disseminate at the level of nano. After procession, nano SiO2's surface could form a good interface with modified alkyd resin. It could take advantages of both silica dioxide and modified alkyd resin. So it could be vastly used in high-temperature brake materials, corrosion resistant material, special material and flame-resistant materials.

Compositions and methods for forming, in an aqueous environment, a nanoaggregate of calcium fluoride and amorphous calcium phosphate-containing compound, such as amorphous calcium phosphate fluoride or amorphous calcium carbonate phosphate fluoride are described. The nanoaggregate (or nanocomposite) can release calcium, phosphate, and fluoride, and ultimately convert to the tooth mineral, fluorapatite. One method for forming such a nanoaggregate involves applying a non-aqueous (e.g., varnish-based) composition (e.g., a suspension), containing solid particles of water soluble salts of calcium, phosphate, and fluoride, to the aqueous environment of the mouth. This results in rapid solubilization of the salts, precipitation of the nanoaggregate, and tooth remineralization. Tooth fluoridation and remineralization may also be carried out by applying to the tooth a non-aqueous carrier containing the nanoaggregate. Whitening agents can also be added to these compositions and methods.

The invention belongs to the nano composite preparation field and relates to a nano titanium dioxide/graphene composite material and a preparation method thereof. The method includes the following steps that: positively charged titanium dioxide sol and negatively charged graphene oxide sol are mixed together so as to form floc sediments; and sodium borohydride hydrothermal reduction is carried out, so that the nano titanium dioxide/graphene composite material can be obtained. The nano titanium dioxide/graphene composite material has large specific surface area and high electrochemical performance; the nano titanium dioxide/graphene composite material can be used as the electrode material of a super capacitor, so that the electrode material can have high specific capacity and high cyclic stability; the nano titanium dioxide/graphene composite material can be also used as the anode material of a lithium ion battery, so that the anode material can have high stability and little possibility of decay; selected preparation materials are safe, nontoxic, environmentally friendly and pollution-free; and the preparation process is simple, feasible and safe, does not introduce toxic substances, and is low in cost, and therefore, industrialization can be facilitated.

This invention is a method of preparing rubber and clay nanometer compound material with pre-expand organic clay. Pre-expand organic clay is got by quality ratio 1:1 of organic solution and organic clay. Rubber and clay nanometer compound material is got by pre-expand organic clay and rubber and addition agent mixing. The organic solvents are toluene, oleic acid, castor oil or normal butyl alcohol. 3~7 quality portions of pre-expand organic clay is added into 100 portions rubber. The organic solvent dosage is few, and organic solvent that does no harm to human body and environment can be used. The operation method is simple, and easy to industrial generation.