1470results about "Copper oxides/halides" patented technology

Disclosed is a method of exfoliating a layered material (e.g., graphite and graphite oxide) to produce nano-scaled platelets having a thickness smaller than 100 nm, typically smaller than 10 nm, and often between 0.34 nm and 1.02 nm. The method comprises: (a) subjecting the layered material in a powder form to a halogen vapor at a first temperature above the melting point or sublimation point of the halogen at a sufficient vapor pressure and for a duration of time sufficient to cause the halogen molecules to penetrate an interlayer space of the layered material, forming a stable halogen-intercalated compound; and (b) heating the halogen-intercalated compound at a second temperature above the boiling point of the halogen, allowing halogen atoms or molecules residing in the interlayer space to exfoliate the layered material to produce the platelets. Alternatively, rather than heating, step (a) is followed by a step of dispersing the halogen-intercalated compound in a liquid medium which is subjected to ultrasonication for exfoliating the halogen-intercalated compound to produce the platelets, which are dispersed in the liquid medium. The halogen can be readily captured and re-used, thereby significantly reducing the impact of halogen to the environment. The method can further include a step of dispersing the platelets in a polymer or monomer solution or suspension as a precursor step to nanocomposite fabrication.

Methods and systems for processing metal oxides from metal containing solutions. Metal containing solutions are mixed with heated aqueous oxidizing solutions and processed in a continuous process reactor or batch processing system. Combinations of temperature, pressure, molarity, Eh value, and pH value of the mixed solution are monitored and adjusted so as to maintain solution conditions within a desired stability area during processing. This results in metal oxides having high or increased pollutant loading capacities and / or oxidation states. These metal oxides may be processed according to the invention to produce co-precipitated oxides of two or more metals, metal oxides incorporating foreign cations, metal oxides precipitated on active and inactive substrates, or combinations of any or all of these forms. Metal oxides thus produced are, amongst other uses; suitable for use as a sorbent for capturing or removing target pollutants from industrial gas streams or drinking water or aqueous streams or for personal protective respirators.

The present invention describes methods for preparing high quality nanoparticles, i.e., metal oxide based nanoparticles of uniform size and monodispersity. The nanoparticles advantageously comprise organic alkyl chain capping groups and are stable in air and in nonpolar solvents. The methods of the invention provide a simple and reproducible procedure for forming transition metal oxide nanocrystals, with yields over 80%. The highly crystalline and monodisperse nanocrystals are obtained directly without further size selection; particle size can be easily and fractionally increased by the methods. The resulting nanoparticles can exhibit magnetic and / or optical properties. These properties result from the methods used to prepare them. Also advantageously, the nanoparticles of this invention are well suited for use in a variety of industrial applications, including cosmetic and pharmaceutical formulations and compositions.

The invention provides a multi-shell-layer metal oxide hollow ball and a preparation method thereof. A hydrothermal method is used for preparing a carbon ball template; metal salts are dissolved in carbon ball suspension liquid, and the gradient distribution, the depth and the number of metal salts entering carbon balls are controlled through regulating adsorption conditions such as metal salt concentration, solution pH value, soaking temperature and time and the like; and the heat treatment is carried out on the carbon balls adsorbing metal ions, and the multi-shell-layer metal oxide hollow ball can be obtained. The shell-layer of the hollow ball prepared by the method is formed by accumulating nanometer crystal particles of metal oxides, the shell layer number can be regulated and changed from two to four, and both the size of the hollow ball and the thickness of the shell layers are controllable. The method provided by the invention is simple and is easy to implement, the controllability is high, the pollution is little, the cost is low, and in addition, the general applicability is realized. The prepared product has a hollow structure and the shell layers with the thickness inthe nanometer level, simultaneously, the internal space can be effectively utilized through the multilayer structure, and the multi-shell-layer metal oxide hollow ball is applied to gas sensitivity and photocatalysis and has the more excellent performance through being compared with the traditional nanometer material and a single-layer hollow ball.

A process of treating metal oxide nanoparticles that includes mixing metal oxide nanoparticles, a solvent, and a surface treatment agent that is preferably a silane or siloxane is described. The treated metal oxide nanoparticles are rendered hydrophobic by the surface treatment agent being surface attached thereto, and are preferably dispersed in a hydrophobic aromatic polymer binder of a charge transport layer of a photoreceptor, whereby π—π interactions can be formed between the organic moieties on the surface of the nanoparticles and the aromatic components of the binder polymer to achieve a stable dispersion of the nanoparticles in the polymer that is substantially free of large sized agglomerations.

The present invention includes a method of producing a crystalline metal oxide nanostructure. The method comprises providing a metal salt solution and providing a basic solution; placing a porous membrane between the metal salt solution and the basic solution, wherein metal cations of the metal salt solution and hydroxide ions of the basic solution react, thereby producing a crystalline metal oxide nanostructure.

The invention relates to platinum-metal oxide composite particles and their use as electrocatalysts in oxygen-reducing cathodes and fuel cells. The invention particularly relates to methods for preventing the oxidation of the platinum electrocatalyst in the cathodes of fuel cells by use of these platinum-metal oxide composite particles. The invention additionally relates to methods for producing electrical energy by supplying such a fuel cell with an oxidant, such as oxygen, and a fuel source, such as hydrogen. The invention also relates to methods of making the metal-metal oxide composites.

The invention discloses a preparation method of a super nanostructure material formed by quantum dots self-assembly. That the alcohols are used as solvent to prepare nano-metal oxides and sulphides or metal oxides and sulphides are reduced to get nano-metal is a widely used method. The super nanostructure material formed by the quantum dots self-assembly draws much attention because of the superior comprehensive properties. The application prospect is wide enough. The invention adopts a method of using the alcohols as the solvent that a super nanostructure with different appearances and is formed by the quantum dots self-assembly which is obtained by changing the condition under the existence condition of surfactant. According to the invention, precursor, namely organic metal compound is dissolved in the alcohol solvent by ultrasonic, stirring and being laid down quietly. Under the effect of the surfactant, the precursor has a nucleation and grows into a plurality of quantum dots, the size of which is similar to nano. Then the dots form a super nanostructure which has a certain shape or space structure along the defined growing direction of the surfactant.

The present invention provides a copper oxide-containing composition that includes copper oxide nanoparticles and one or more heteroatom donor ligands bonded to the surface of the nanoparticles, where x and y are numbers having a ratio that is equal to the ratio of the average number of M atoms to the average number of 0 atoms in the nanoparticles. The nanoparticles are stabilized by the one or more heteroatom donor ligands which act as a protective layer that cap the surface of the nanoparticles. The present invention also provides a solution of the copper oxide nanoparticles that may be applied to a substrate and then subsequently reduced to copper metal. Finally, the invention provides a method of preparing the copper oxide nanoparticles.

In chloride media, copper anodic dissolution is a mature process for producing cuprous oxide (Cu2O); and based on the preparation process, the invention provides a method for directly growing a one-dimensional nanometer Cu2O array on an anode metal copper substrate through adding a surface active agent to an anode slot, and controlling the concentration of electrolyte chloride salt in the anode slot, the concentration of alkali in a cathode slot, electric quantity of electrolysis and electrolysis temperature. The array has controllable appearance, and consists of a nanometer belt, a nanometer plate and a nanometer line, wherein the top end of the one-dimensional array can be acicular, circular, and the like. The one-dimensional nanometer Cu2O array directly growing on the copper substrate has excellent effect of field emission performance and visible light catalysis, and has wide application prospect in technical fields of vacuum microelectronic devices, panel display, advanced oxidation and other aspects.

The present invention is directed to novel sol-gel methods in which metal oxide precursor and an alcohol-based solution are mixed to form a reaction mixture that is then allowed to react to produce nanosized metal oxide particles. The methods of the present invention are more suitable for preparing nanosized metal oxide than are previously-described sol-gel methods. The present invention can provide for nanosized metal oxide particles more efficiently than the previously-described sol-gel methods by permitting higher concentrations of metal oxide precursor to be employed in the reaction mixture. The foregoing is provided by careful control of the pH conditions during synthesis and by ensuring that the pH is maintained at a value of about 7 or higher.

Provided herein are nanofibers and processes of preparing nanofibers. In some instances, the nanofibers are metal and / or ceramic nanofibers. In some embodiments, the nanofibers are high quality, high performance nanofibers, highly coherent nanofibers, highly continuous nanofibers, or the like. In some embodiments, the nanofibers have increased coherence, increased length, few voids and / or defects, and / or other advantageous characteristics. In some instances, the nanofibers are produced by electrospinning a fluid stock having a high loading of nanofiber precursor in the fluid stock. In some instances, the fluid stock comprises well mixed and / or uniformly distributed precursor in the fluid stock. In some instances, the fluid stock is converted into a nanofiber comprising few voids, few defects, long or tunable length, and the like.

Nanoplatelet forms of metal hydroxide and metal oxide are provided, as well as methods for preparing same. The nanoplatelets are suitable for use as fire retardants and as agents for chemical or biological decontamination.

The present invention relates to a method for manufacturing metal nanoparticles, more particularly to a method for manufacturing metal nanoparticles, which includes: preparing a mixed solution including capping molecules, a metal catalyst, a reducing agent, and an organic solvent; adding a metal precursor to the mixed solution and raising to a predetermined temperature and stirring; and lowering the temperature of the mixed solution and producing nanoparticles. Embodiments of the invention allow the synthesis of nanoparticles, such as of single metals, metal alloys, or metal oxides, to a high concentration in a water base using a metal catalyst.

The invention provides a process for production of fine spherical particles of a carbonate or a hydroxide of nickel, cobalt or copper which comprises: dissolving a carbonate or a hydroxide of nickel, cobalt or copper having the general formula (I)wherein M represents Ni, Co or Cu, and x and y are numerals satisfying the followings: 0<=x<=2, 0<=y<=2 and x+y=2, in aqueous ammonia, converting the resulting solution to a W / O emulsion containing droplets of the solution in a non-aqueous medium, and then removing volatile components including ammonia from within the droplets, thereby precipitating a basic carbonate or a hydroxide of a metal selected from nickel, cobalt and copperin the droplets.The fine spherical particles of a carbonate or a hydroxide of nickel, cobalt or copper obtained according to the process of the invention are especially useful as a precursor for the manufacture of uniform, fine spherical particles of nickel, copper or cobalt metal, as well as useful as themselves as a catalyst for use in organic synthesis, a carrier, a pigment, a filler or a glaze.

A method for synthesis of high quality colloidal nanoparticles using comprises a high heating rate process. Irradiation of single mode, high power, microwave is a particularly well suited technique to realize high quality semiconductor nanoparticles. The use of microwave radiation effectively automates the synthesis, and more importantly, permits the use of a continuous flow microwave reactor for commercial preparation of the high quality colloidal nanoparticles.

The invention discloses a graphene loaded Cu-CuxO composite material and a preparation method thereof. Through the preparation method, Cu-CuxO composite particles with uniform particle size and controllable morphology and components can be loaded on graphene. The preparation method comprises the following steps of dispersing uniformly oxidized graphite in deionized water by supersonic waves to obtain an oxidized graphene solution, adding a copper salt into the oxidized graphene solution, mixing uniformly, adjusting a pH value of the mixed solution obtained by the previous step to an appropriate pH value, putting the mixed solution into a reactor for a hydro-thermal reaction, carrying out separation and calcination of reaction products obtained by the hydro-thermal reaction to obtain the graphene loaded Cu-CuxO composite material. The preparation method has the advantages of common and easily available raw materials, low cost, and simple and safe preparation processes. The prepared graphene loaded Cu-CuxO composite material has good structural stability, excellent physicochemical properties, and potential application values in the fields of lithium ion batteries, photoelectric conversion, catalytic degradation and electron devices.

The invention provides a method for preparing polyhedral cuprous oxide nanometer granules. The method adopts a chemical solution method to prepare polyhedral cuprous oxide nanometer granules comprising cubes, chamfered cubes, cubic octahedrons, chamfered octahedrons or octahedral series. The method comprises the following concrete steps: copper salt is dissolved in water and stirred at a temperature between 50 and 60 DEG C; polyvinyl pyrrolidone, strong base solution and ascorbic acid solution are orderly added, stirred at a constant temperature between 50 and 60 DEG C and kept for 1 to 3 hours; after the reaction is over, the centrifugation is carried out; and a large amount of the deionized water is used for washing, and the cuprous oxide nanometer granules can be obtained after vacuum drying. By regulating the adding amount of the polyvinyl pyrrolidone, the polyhedral cuprous oxide nanometer granules comprising the cubes, the chamfered cubes, the cubic octahedrons, the chamfered octahedrons or the octahedral series are obtained. The method has the advantages of moderate condition, simple operation, low cost, high yield, controllable shape, and so on.

Methods for manufacturing nanomaterial dispersions, such as nanomaterial concentrates, and related nanotechnology are provided. The nanomaterial concentrates provided can be more cheaply stored and transported compared to non-concentrate nanomaterial forms.

A process for preparing the size and shape controllable ampholytic metal oxides and their metallic nanotubes features that based on the principle that under existance of excessive alkali the ampholytic metal hydroxide can become coordinate anions, under the action of surfactant as "soft template", the ampholytic metal oxide and its metallic nanotubes can be prepared by direct hydrothermal reaction or redox reaction (for example, ZnO, CuO, Al2O3, PbO2, SnO2 and relative metals). Its advantages are simple process, controllable sizes of nanotube, uniform wall thickness, and high output.

The present invention relates to a method of manufacturing cubic copper nanoparticles, and in particular, to a method including (a) mixing and agitating a copper precursor and an amine compound; (b) raising the temperature of the mixed solution up to 90-170° C. and reacting it at the same temperature; (c) adding the mixture to nonaqueous solvent to lower the temperature of the solution to 20-50° C. when the incubation completes; and (d) precipitating and obtaining the nanoparticles by adding an alcohol solvent to the mixture. According to the invention, while conductive wiring is formed metal nanoparticles can be manufactured not in sphere but in cubic shape so that void between particles can be efficiently removed and the height of wiring can be raised.

The invention discloses a novel and large-scale preparation method of nano-cuprous oxide. The method comprises the steps of: fully dissolving copper salt and an organic protective agent in a dissolvent; gradually warming to 20-70 DEG C; adding a reducing agent into a reaction system after the temperature is stabilized; reacting for 20-30min by continuously stirring; gradually cooling; standing the cooled solution and centrifuging; and repeatedly washing by alcohol, deionized water and acetone sequentially in sequence to obtain stable cuprous oxide. The method is simple in technology, simple in operation, moderate in reaction, short in reaction time, and high in efficiency, thereby being suitable for large-scale production; the product is good in performance, the grain size of the nano-cuprous oxide is less than 20nm, and the product has good secondary dispersibility in various oil agents; the method is low in preparation cost, low in energy consumption, and free of the generation of harmful wastes, and meets the modern production requirement of 'green protection, environment protection and energy saving'.

The invention discloses a nano copper oxide analogue enzyme and a method for measuring hydrogen peroxide by using the nano copper oxide analogue enzyme as a peroxide analogue enzyme. The nano copper oxide analogue enzyme is nano copper oxide powder with a grain diameter ranging from 5 to 8 nanometers; the nano copper oxide is Cuo of a monoclinic system, the space group is C2 / c; and the maximum absorption peaks of the typical ultraviolet-visible absorption spectra of the prepared nano copper oxide are at 280-nanometer positions. The nano copper oxide analogue enzyme is obtained by a chemical precipitation process. The nano copper oxide analogue enzyme has a catalytic property similar to that of peroxidase. When the nano copper oxide analogue enzyme is used in a 4-aminoantipyrine-ol system, the colorimetric detection of hydrogen peroxide can be realized, the hydrogen peroxide detection limit is 0.02mmol / L, and the linear range is 1mmol / L.

A closed loop combustion system for the combustion of fuels using a molten metal oxide bed.

The invention relates to a composite functional material and a preparation method thereof, in particular to a preparation method of a cuprous oxide / reduced graphene oxide composite functional material. The invention aims to solve the problem that the present method for preparing the cuprous oxide / reduced grapheme oxide composite functional material causes pollution to the environment and has a complicated synthetic process. The preparation method comprises the following steps: 1, preparing graphene oxide dispersion liquid A; 2, preparing the mixed liquid B of copper salt and glucose B; 3, preparing an aqueous alkali C; 4, mixing A and B to obtain a mixed liquid D; 5, mixing D and C to obtain a mixed liquid E; and 6, placing the mixed liquid E on a heater for reaction, centrifuging, washing and drying. The preparation method provided by the invention has the advantages that the required time is short, the energy consumption is small, the raw materials are available, the process is simple, the conditions are mild, and no pollution is caused to the environment. The preparation method is applicable to the field of grapheme-based hybridized functional materials among functional materials.

The invention belongs to to the field of the preparation of inorganic non-metallic material, more particularly relates to a common method for synthesizing hollow metal oxide with high porosity. The method of the invention adopts soluble transition metal nitrate (MNO3, M is equal to Cu, Ni, Co), soluble sulfur source (thiourea) and selenium source (sodium selenite, Na2SeO3) as raw materials; metal sulfides (CuS, Cu2S, NiS, CoS) and the precursor of a selenide (CuSe) are first prepared and then treated with temperature programming and high temperature oxidation to obtain a corresponding porous metal oxide hollow framework (CuO, NiO and Co3O4). The method of the invention overcomes the defects such as high cost of material and production and complex process, etc., in the prior preparation method and the prepared metal oxides has large specific surface area, high thermal stability and good dispersity without need of being added with costly macromolecular organic templates and is easy to achieve industrialized production.

We disclose a method of manufacture of silver oxide nano metal particles of 2-10 mm size with specific phase and geometry in their exterior and interior making them suitable for use as potent antimicrobial and styptic agents.

The present invention discloses a method for preparing a graphene oxide base porous film by using metal hydroxide nanowires and graphene oxide, and an application of the graphene oxide base porous film. According to the present invention, a chemical oxidation ultrasonic dispersion method is adopted to prepare a diluent negatively charged graphene oxide (GO) dispersion liquid with a content of 0.01-0.05%; the GO dispersion liquid is mixed with a positively charged metal hydroxide nanowire solution with a concentration of 0.15-1.2 mM, wherein the diameter is nanometer scale, and the length is micrometer scale; stirring is performed for 5-30 minutes; vacuum suction filtration (negative pressure of 50-85 kPa) is performed on a polycarbonate porous film; a hydrazine hydrate treatment is performed for 5-60 minutes; and an acid (HCl, H2SO4, HNO3) or a complexing agent ethylenediamine tetra acetic acid (EDTA) is adopted to remove the metal hydroxide nanowires to obtain a nanometer GO porous separation film formed by the left pores through removing the nanowires, wherein molecules with a molecular weight of about 350 daltons can be effectively separated with the separation film. The graphene oxide base porous film prepared by the method of the present invention has a separation performance similar to a nanometer graphene oxide separation film, and further is a porous separation film with good separation efficiency.

The invention relates to a method for preparing hydrotalcite, which comprises the following steps of: (1) preparation of buffer solution, namely preparing the buffer solution with a pH value of 9 to 10 by using aqueous ammonia and ammonium chloride or aqueous ammonia and ammonium bicarbonate; (2) dripping of metal salt solution, namely dripping the metal salt solution into the stirred buffer solution, and continuously stirring the solution for 1 to 1.5 hours after the dripping is finished; (3) crystallization and washing, namely crystallizing the stirred mixed solution for 6 to 24 hours at the temperature of between 55 and 95 DEG C, and filtering and washing the crystallized solution to obtain filter solution and filter cakes; and (4) drying and grinding, namely drying the filter cakes at the temperature of between 55 and 95 DEG C and grinding the filter cakes into powder. The method provides a stable solution environment with a pH value of 9 to 10 for the formation of the hydrotalcite by using the buffer solution used as a precipitating agent, ensures complete crystal phase structure and uniform grain size of a hydrotalcite product, and solves the problems of difficult pH value control, wide grain size distribution and the like during preparing the hydrotalcite by using a traditional co-precipitation method in the industry.