1935results about "Ferroso-ferric oxides" patented technology

A process, system and sorbent for removal of mercury from a combustion exhaust gas stream in a combustion exhaust gas purification scheme that includes a combustion exhaust scrubber system that uses an aqueous liquid to remove acid gases from the combustion exhaust gas. A powdered mercury sorbent is used. The sorbent is introduced into the aqueous scrubber liquid in the scrubber system. After introduction of the mercury sorbent into the scrubber liquid, at least some of the mercury sorbent is separated from the scrubber liquid.

Nanoparticle compositions of noble metals, and methods of making them, are described. The nanoparticle compositions are made by reacting a salt or complex of a noble metal, such as Au, Ag, Cu or Pt, with a weak ligand, and a reducing agent, in a single liquid phase. The noble metal is typically provided as a halide or carboxylate. The ligand is preferably a fatty acid or aliphatic amine. The reducing agent is preferably a borohydride reagent, hydrazine, or a mixture thereof. Nanocrystals in the size range of 1 nm to 20 nm are produced, and can be made in substantially monodisperse form.

An aspect of the present invention relates to a magnetic particle obtained by heat-treating a hexagonal ferrite magnetic material in reducing atmosphere containing hydrocarbon gas.

A method and structure for making magnetite nanoparticle materials by mixing iron salt with alcohol, carboxylic acid and amine in an organic solvent and heating the mixture to 200–360 C is described. The size of the particles can be controlled either by changing the iron salt to acid / amine ratio or by coating small nanoparticles with more iron oxide. Magnetite nanoparticles in the size ranging from 2 nm to 20 nm with a narrow size distribution are obtained with the invention. The invention can be readily extended to other iron oxide based nanoparticle materials, including M Fe2O4 (M=Co, Ni, Cu, Zn, Cr, Ti, Ba, Mg) nanomaterials, and iron oxide coated nanoparticle materials. The invention also leads to the synthesis of iron sulfide based nanoparticle materials by replacing alcohol with thiol in the reaction mixture. The magnetite nanoparticles can be oxidized to γ-Fe2O3, or α-Fe2O3, or can be reduced to bcc-Fe nanoparticles, while iron oxide based materials can be used to make binary iron based metallic nanoparticles, such as CoFe, NiFe, and FeCoSmx nanoparticles.

Novel chromatographic materials for chromatographic separations, columns, kits, and methods for preparation and separations with a superficially porous material comprising a substantially nonporous core and one or more layers of a porous shell material surrounding the core. The material of the invention is comprised of superficially porous particles and a narrow particle size distrution. The material of the invention is comprised of a superficially porous monolith, the substantially nonporous core material is silica; silica coated with an inorganic / organic hybrid surrounding material; a magnetic core material; a magnetic core material coated with silica; a high thermal conductivity core material; a high thermal conductivity core material coated with silica; a composite material; an inorganic / organic hybrid surrounding material; a composite material coated with silica; a magnetic core material coated with an inorganic / organic hybrid surrounding material; or a high thermal conductivity core material coated with an inorganic / organic hybrid surrounding material.

Monodisperse colloidal nanocrystal clusters of magnetite (Fe3O4) with tunable sizes from about thirty to about three hundred nanometers have been synthesized using a high-temperature hydrolysis process. The colloidal nanocrystal clusters are capped with polyelectrolytes, and highly water soluble. Each cluster is composed of many single magnetite crystallites, thus retaining the superparamagnetic behavior at room temperature. The combination of superparamagnetic property, high magnetization, and high water dispersibility makes the colloidal nanocrystal clusters ideal candidates for various important biomedical applications such as drug delivery and bioseparation. The present invention is further directed to methods for forming colloidal photonic crystals from both aqueous and nonaqueous solutions of the superparamagnetic colloidal nanocrystal clusters with an external magnetic field applied thereto. The diffraction of the photonic crystals can be tuned from near infrared to visible and further ultraviolet spectral region by varying the external magnetic field.

A two-step chemical precipitation process involving hydroxide precipitation and sulfide precipitation combined with “field separation” technology such as magnetic separation, dissolved air flotation, vortex separation or expanded plastics flotation, effectively removes chelated and non-chelated heavy metal precipitates and other fine particles from water. In the first-step, the non-chelated heavy metals are precipitated as hydroxides and removed from the water by a conventional liquid / solids separator such as an inclined plate clarifier to remove a large percentage of the dissolved heavy metals. The cleaned water is then treated in a second precipitation step to remove the residual heavy metals to meet discharge limits. In the second precipitation step, any metal precipitant more effective than hydroxide for metal precipitation can be used. The invention improves metal removal, lowers cost because fewer chemicals are used, produces less sludge, and reduces the discharge of toxic metals and metal precipitants to the environment.

A magnetic composition comprised of cobalt ferrite nanoparticles dispersed in an ionic exchange resin.

The invention provides a preparation method of a nano porous metal oxide / carbon lithium ion battery cathode material. The preparation method comprises the following steps: firstly, weighting ferric salt or manganese salt and carboxylate organic ligands, and putting into a high-pressure reaction kettle; and after a polar solvent is added and dissolved, carrying out a hydrothermal reaction for 10-72h at 100-180 DEG C to generate a transition metal coordination polymer precursor; and after the transition metal coordination polymer precursor is washed and dried, decomposing the precursor for 0.5-6h at a temperature of 300-600 DEG C in an inert atmosphere in a tube furnace, thus obtaining a nano porous metal oxide / carbon lithium ion battery cathode material containing iron oxides or manganese oxides. According to the preparation method, since the transition metal coordination polymer precursor which is structurally designable and controllable is used as a template-type precursor, a nano porous metal oxide / carbon lithium ion battery cathode material is obtained by using an in-situ thermal decomposition method. The method is simple in process, and the obtained products have the advantages of high electrical conductivity, high specific capacity, good cycle stability, excellent high-ratio discharge performance and high energy density.

A method of forming mono-disperse iron-oxide core metal shell nanoparticles is disclosed. Particle size of the oxide core seeds is controlled and capped seeds are formed. The capping layer is desorbed by a thermally activated process and metal such as gold is chemically deposited on the core seeds in situ. This process can be repeated to produce multi-metal or different metal shells. A second capping layer is applied on the core / shell composite nanoparticles. In another step, the particles are sized by centrifuging to obtain a tightly controlled and narrow particle size distribution. The water-dispersibility of the particles is achieved by a thiol exchange reaction on the gold shell of the core / shell nanoparticles or by deposition of gold on ferritin-derived iron oxide cores in aqueous solution. Mono and multilayer thin films are assembled on different substrates using the core / shell particles and linking molecules.

Microparticles having a metal-containing core encapsulated in a graphitic shell containing hetero atoms are made by forming, in a liquid medium, colloidal particles containing a metal-oxo species of Fe, Co, Ni and Pd, colloidally stabilized by a surfactant and containing source material of carbon and the hetero atoms. These particles are pyrolyzed in inert gas to yield the microparticles. In an alternative method, silica gel coated particles are formed by colloidally stabilizing particles containing metal species and forming silica at the boundary of the stabilized particle.

A preparation method of a grapheme and ferriferrous oxide composite nanometer material belongs to the technical field of functional materials. The preparation method comprises the following steps: at first, oxidized grapheme is prepared by an improved chemical method; and then oxidized grapheme and ferric ions are adopted as raw materials, and are compounded through adopting a solvothermal technology to carry out one-step in-situ reduction to obtain the grapheme and ferriferrous oxide composite nanometer material. The preparation method solves the problems in the prior art that the interface binding force of grapheme and a magnetic material is insufficient, the appearances, the sizes and the magnetism of magnetic material particles are uncontrollable, and the magnetic material particles cannot be dispersed in water; the prepared composite nanometer material shows a microspheric appearance, has a loose surface and is high in specific surface area; through the change of the ratio of grapheme to the ferric ions, final magnetic property and electrical property of the composite material can be adjusted; and the controllable growth of the grapheme and ferriferrous oxide composite material is realized. The prepared grapheme and ferriferrous oxide nanometer microsheric material with magnetic and electric properties can be used in fields such as biological medicine, energy, invisibility and electronic materials.

The invention provides a method for preparing radioactive nuclide magnetic microsphere used in vivo for the treatment of vessel embolism and tumor, wherein the process by the invention comprises the steps of, preparing magnetic ferrosic oxide particles, preparing magnetic microballoons, marking protein #+[131] and preparing radioactive nuclide. The invention solves the problems of rejection reaction of heterology antibody and damage of normal tissues.

Stimuli-responsive magnetic nanoparticles, methods of making the nanoparticles, and methods of using the nanoparticles.

Composite particles are disclosed comprising magnesium oxide, iron oxide, and biochar; and methods of making and using the composite particles. The composite particles may be used to recover solutes including phosphate, nitrate, ammonium, and organic compounds from aqueous solution, and the resulting solute-loaded particles may be used as a fertilizer to enhance plant growth. The composites be used to remove pollutants from agricultural runoff, wastewater, and surface water. The particles possess magnetic properties that enhance their recovery following solute adsorption.

The present invention discloses a composition for a desulfurizer with a high sulfur capacity and a process for making the same. The composition comprises the active components of three kinds of iron oxides and is used in the desulfurizer to remove hydrogen sulfide from the gaseous and liquid state feed stocks. The above-mentioned composition comprises cubic ferroferric oxide in the form of crystalline phase (Fe3O4), amorphous ferric oxide (Fe2O3) and amorphous ferric oxide monohydrate (Fe2O3.H2O). The composition has a sulfur capacity of at least 40%. The process for preparing the composition comprises the following steps: (1) mixing a solid ferrous compound with a solid hydroxide at a molar ratio of iron to hydroxyl being in the range from 1:2 to 1:3; (2) kneading the mixture feeds obtained in step (1) and making them react completely; (3) drying the products obtained in step (2) in the air; (4) washing and filtering the feeds obtained in the step (3); (5) naturally drying or baking the solids obtained in step (4) to form a composition for a desulfurizer with a high sulfur capacity. The process of the present invention is simple and easy to operate, consumes less energy and produces the products with a stable quality.

A general, reproducible, and simple synthetic method that employs readily available chemicals permits control of the size, shape, and size distribution of metal oxide nanocrystals. The synthesis entails reacting a metal fatty acid salt, the corresponding fatty acid, and a hydrocarbon solvent, with the reaction product being pyrolyzed to the metal oxide. Nearly monodisperse oxide nanocrystals of Fe3O4, Cr2O3, MnO, Co3O4, NiO, ZnO, SnO2, and In2O3, in a large size range (3-50 nm), are described. Size and shape control of the nanocrystals is achieved by varying the reactivity and concentration of the precursors.

The invention discloses a preparation method of a nitrogen doped graphene / metal oxide nanometer composite material. The preparation method comprises the following steps of: weighing graphene and metal salt the cation of which is trivalent or quadrivalent to be added in a dispersant, and then carrying out ultrasonic dispersion to obtain mixed liquor; (2), reacting the mixed liquor obtained in the step (1) with alkaline air on a gas-liquid interface for 3-12hours at the temperature of 60-200 DEG C, cooling, centrifuging, washing a precipitate and drying to obtain powder; and (3) introducing the alkaline air or a mixed gas of the alkaline air and inert gas, maintaining the powder to be at the constant temperature of 600-900 DEG C for 2-6 hours, and cooling to room temperature to obtain the nitrogen doped graphene / metal oxide nanometer composite material. According to the invention, the conductibility and interface action of the composite material obtained by the method provided by the invention are improved due to the doping of nitrogen; and the method provided by the invention has the advantages of simple process, cheap cost, high productive rate, short cycle and the like, and is environment-friendly, and can be suitable for industrialization large-scale production.

A method and structure for making magnetite nanoparticle materials by mixing iron salt with alcohol, carboxylic acid and amine in an organic solvent and heating the mixture to 200-360 C. is described. The size of the particles can be controlled either by changing the iron salt to acid / amine ratio or by coating small nanoparticles with more iron oxide. Magnetite nanoparticles in the size ranging from 2 nm to 20 nm with a narrow size distribution are obtained with the invention. The invention can be readily extended to other iron oxide based nanoparticle materials, including MFe2O4 (M=Co, Ni, Cu, Zn, Cr, Ti, Ba, Mg) nanomaterials, and iron oxide coated nanoparticle materials. The invention also leads to the synthesis of iron sulfide based nanoparticle materials by replacing alcohol with thiol in the reaction mixture. The magnetite nanoparticles can be oxidized to γ-Fe2O3, or α-Fe2O3, or can be reduced to bcc-Fe nanoparticles, while iron oxide based materials can be used to make binary iron based metallic nanoparticles, such as CoFe, NiFe, and FeCoSmx nanoparticles.

The present invention relates to a preparation method for a magnetic carbon-coated ferroferric oxide nano-composite material by a one-step carbonization reaction method. With the present invention, physical properties and chemical properties of the magnetic material are improved, and the application range of the nano-composite material is enlarged. The technical scheme of the present invention is that: massive FeCl3.6H2O is crushed into powder; the FeCl3.6H2O powder is placed in a beaker; then glycol is added, and a uniform stirring treatment is performed; urea and cyclodextrin powder are added to the resulting solution, and a uniform stirring treatment is performed; then the resulting mixing solution is transferred to a reaction kettle, and a reaction is performed for 6-24 hours at a temperature of 180-200 DEG C and under pressure of 0.105-0.150 MPa; finally, the mixing solution is cooled to the room temperature, treatments of sedimentation, separation and washing are performed, then a drying treatment is performed for 4-8 hours at the temperature of 80 DEG C to prepare the magnetic carbon-coated ferroferric oxide nano-composite material. According to the present invention, the preparation method is simple; the cost is low; the particle size of the product is small; the particles are the core-shell structures, wherein the Fe3O4 is the core, the carbon-coated layer is the amorphous carbon, and the surface of the carbon-coated layer contains hydroxyl groups; the material of the present invention is adopted as the catalyst carrier, and is applicable for wastewater treatments.

Briefly, in accordance with one embodiment of the present invention, a process for making a magnetic composite which comprises providing a polymeric resin and a magnetic powder, the magnetic powder having a mean particle size with a value for standard deviation that is less than the value for the mean particle size of the said magnetic powder, the said magnetic composite being made by mixing said magnetic powder with said polymeric resin and molding the said mixture into a desired shape and a size and said magnetic composite having a magnetic permeability between 30 and 50. In another embodiment the present invention is a composition for a magnetic composite comprising a polymeric resin and a magnetic powder, the said powder having a mean particle size with a value of standard deviation that is less than the value of the mean particle size of the magnetic powder, wherein said magnetic composite has a magnetic permeability between about 30 and about 50.

The invention relates to a method for preparing graphene / Fe3O4 composite powder by an alcohol thermal method, which comprises the following steps of: (1) weighing oxidated graphite and ferric salt at room temperature, dispersing into a glycol solution, adding polyethylene glycol after dissolving completely, then adding anhydrous sodium acetate, stirring and forming reaction liquid; (2) putting into a reaction kettle, heating to the temperature of 180 to 220 DEG C and reacting for 8 to 16h; and (3) cooling to the room temperature, collecting a product by using a magnet, washing the product by deionized water and drying so as to obtain the graphene / Fe3O4 composite powder. In the invention, the preparation method is simple and is easy for industrialized production; and Fe3O4 in the prepared graphene / Fe3O4 composite powder has pure crystalline phase, little possibility of agglomeration, favorable compounding with graphene and good dispersibility at the surface of the graphene and in the layer of the graphene, and the composite powder has small resistivity and high magnetization intensity.

The invention discloses a method for preparing carbon-coated superparamagnetic ferroferric oxide gel, which comprises: dissolving ferrocene and surfactant in an acetone solvent; adding solution of hydrogen peroxide into the solution to directly oxidize the ferrocene to synthesize polycrystal uniform magnetic nano balls under a low-temperature (180 to 240 DEG C) solvothermal condition; and allowing the polycrystal uniform magnetic nano balls to react in a magnetic field to prepare a magnetic linear nano material. The polycrystal uniform magnetic nano balls and nano chains are characterized in that: the particle size of the polycrystal uniform magnetic nano balls is limited to a narrow range and controllable; and the nano chains consist of uniform spherical particles and have high stability, and the inter-chain distance is controllable. The superparamagnetic polycrystal uniform nano ball and linear nano chain materials have high superparamagnetism and high chemical stability and gel stability and have promising application prospect in the field of biomedicine, nano self-assembly and the like; the nano balls are grafted by medicaments and can be used as medicament carriers; under the action of the magnetic field, the nano balls can be used as magnetic control photonic crystal; and the nano chains have a promising application prospect in the field of Bragg reflectors, magnetic probes, biomedicine and the like.

A method for preparing nano ferroferric oxide spheres with adjustable particle size with micro wave belongs to the nano material preparation technical field. The method comprises the following steps: the first step, adding inorganic salt and a surface active agent after malysite dissolves in polylol, adding a latent solvent; mixing and stirring to obtain a precursor liquid of ferroferric oxide, wherein, the mass ratio of the polylol and the malysite is (5-100):1, the mass ratio of the inorganic salt and the malysite is (1-6): 1, the mass ratio of the surface active agent and the malysite is (0-5):1, and the volume ratio of the latent solvent and the polymol is (0-1):1; the second step, placing the precursor liquid of the ferroferric oxide in a glass tube used by microwave; conducting microwave heating reaction in a microwave reactor; and obtaining magnetic ferroferric oxide particles after the reaction. The method is simple and quick; the prepared magnetic ferroferric oxide particles have the advantages of strong magnetism, adjustable size and good dispersibility, as well as dispersion in water or organic solvent, and suitability for application in the biomedicine field or the mechanical electronic field.

Magnetic nanoparticles are provided that have a superparamagnetic core and a nanoporous silica shell surrounding the core. The shell is functionalized with amine or S-nitrosothiol groups both inside and outside the nanopores. A process to provide such nanoparticles involves hydrolyzing tetraethoxysilane (TEOS) in a microemulsion of a superparamagnetic nanoparticle to form a superparamagnetic nanoparticle encapsulated by an incompletely hydrolyzed nanoporous silica shell, and hydrolyzing an amine-containing compound or a thiol-containing compound in situ in the presence of the incompletely hydrolyzed nanoporous silica shell before hydrolysis and densification of the silica shell is complete to functionalize the nanoporous silica shell with amine or thiol groups both inside and outside the nanopores and to maintain nanoporosity of the shell. Such magnetic nanoparticles are useful as carriers for chemical or biological species, particularly for magnetic resonance imaging, optical imaging, targeted drug delivery, cell delivery and magnetic separation applications.

The invention belongs to the technical field of materials, and particularly relates to a preparation method of graphene with nano ferroferric oxide precipitated on surface, which concretely comprises the steps of: firstly, oxidizing natural flake graphite and obtaining graphite oxide; further carrying out ultrasonic stripping on the graphite oxide and forming graphene oxide suspension; then, carrying out reduction reaction on the graphene oxide suspension under the action of strong reducing agent, and obtaining black flocculent flake graphene; and finally, taking hydrogen peroxide as an oxidant, and depositing Fe3O4 on the surface of the graphene in an alkaline solution. The invention realizes the modification of nanoscale Fe3O4 for the surface of the graphene. The obtained modified graphene is not doped with other elements except the Fe element, and can be well dispersed in a high-performance resin matrix, so that the mechanical property, the thermal performance, the electromagnetic performance and the friction property of the resin matrix can be improved, and phenolic resin, bismaleimide, cyanate ester and other products can be updated, or a new application field can be developed..

The invention relates to a preparation method of magnetic graphene, in particular to a chemical preparation method of magnetic graphene. The preparation method aims at solving the problems of the existing synthesis method that the reaction process is toxic and harmful to the environment, large-scale production cannot be realized, the morphology, size and magnetism of magnetic nanoparticles in the magnetic graphene are not controllable and the magnetic graphene cannot be dispersed in water. The chemical preparation method comprises the steps of: 1) preparing aminated Fe3O4 magnetic nanoparticles; 2) preparing graphene; and 3) preparing magnetic graphene through chemical reaction. The chemical preparation method of the magnetic graphene has the advantages that the high temperature and the high pressure are not required, the equipment is simple, the process cost is low, the environment is protected, no pollution is caused, the grain size of the synthesized magnetic nanoparticles is uniform, the controllable growth of the magnetic nanoparticles can be realized by changing reaction conditions, the solubility of the synthesized magnetic graphene is 0.8-1.2mg / ml, the magnetic graphene can be stably dispersed in water and sediment does not occur within 1-2 months. The graphene prepared by adopting the method can be used in biomedical, energy, electronic fields and the like.

The invention relates to a method for hydrothermally preparing mono-dispersed hollow magnetic nanometer particles. The method comprises the following steps of: firstly, mixing a divalent metal salt solution with a urea solution; secondly, adding an organic dispersant and a divalent metal oxidation inhibitor; thirdly, slowly adding an alkali precipitant solution into the solution; fourthly, adjusting the pH (Potential of Hydrogen) value of the mixed solution to 10-12; and finally, adding a surface radical modifier, and carrying out hydrothermal reaction for 5-15 hours at the temperature of 150-250 DEG C, so as to prepare the magnetic nanometer particles having a hollow structure. Compared with the prior art, the method provided by the invention has the advantages of simple technique step, low cost and the like, and is easy to be large-scale.

The invention discloses a c hydrothermal preparation method for carbon cladded nanometer ferriferrous oxide particles. The method comprises the following steps: mixing an glucose carbon source solution with a ferric nitrate solution; subjecting an obtained mixture to a hydrothermal reaction; collecting sediment through centrifugation after the hydrothermal reaction and dispersing the sediment in ionic water again; carrying out freeze-drying so as to obtain powder; and calcining the powder in a tubular furnace in an inert atmosphere so as to obtain the carbon cladded nanometer ferriferrous oxide particles. The nanometer particles have good stability, do not easily get agglomerated and have a particle size controllable within a range from 50 nm to 500 nm; and the preparation method is simple, safe and non-toxic, has high output and is applicable to industrial production and utilization. The carbon cladded nanometer ferriferrous oxide particles can be used in a wide variety of fields like magnetic materials, catalyst supporters, magnetic resonance imaging and targeting drug carriers; and the particles can also be used for a negative electrode material of an electrode of a novel lithium ion battery and show a reversible lithium storage property.

The invention discloses Fe3O4 nano-particles with high dispersion stability in water phase, and a preparation method of the Fe3O4 nano-particles. The surface ligand of each Fe3O4 nano-particle is poly-carboxyl organic molecule with three or more carboxyl groups; the preparation method of the Fe3O4 nano-particles comprises the steps of: firstly, taking high boiling point organic solvent as solvent and oleic acid as the ligand; carrying out high-temperature thermal decomposition on iron oleate to obtain mono-dispersed oil-soluble Fe3O4 nano-particles; and then, adopting a method of ligand exchange, and using the poly-carboxyl organic molecules to replace the oleic acid ligands on the surfaces of the oil-soluble Fe3O4 nano-particles to obtain the water-soluble Fe3O4 nano-particles. The preparation method is convenient in operation process, low in requirement for equipment and low in price of the needed raw materials, and by-products are pollution-free. The water-soluble Fe3O4 nano-particles have better water system dispersion stability within the pH value range of 2-13, and a new economical and practical method is provided for preparing hydrophilic Fe3O4 nano-particles applied to the biological medicine field.