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674 results about "Ferriferrous Oxide" patented technology

Preparation method of grapheme and ferriferrous oxide composite nanometer material

InactiveCN103274396ASolve the lack of interface binding forceResolving Particle MorphologyMaterial nanotechnologyGrapheneMicrosphereSolvent
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.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Carbon cladded ferriferrous oxide negative electrode material of lithium ion battery and preparation method thereof

The invention discloses a carbon cladded ferriferrous oxide negative electrode material of a lithium ion battery and a preparation method thereof. The negative electrode material is a carbon cladded Fe3O4 composite material and has a particle size in a range of 1 to 100 nm. The preparation method comprises the following steps: with NaCl used as a dispersing agent and a supporter, fully mixing NaCl with a metal oxide source and a solid carbon source; drying an obtained mixed solution under vacuum to obtain a mixture; placing the mixture into a tubular furnace for calcination in an inert atmosphere so as to obtain a calcined product; and rinsing and grinding the calcined product to obtain carbon cladded metal oxide nanometer particles. The method is safe and non-toxic and is simple to operate; during charging and discharging tests of a lithium ion button cell made of the carbon cladded ferriferrous oxide negative electrode material, discharge specific capacity can be maintained at 620 to 900 mAh/g after 30 cycles of charging and discharging at a current of 0.1C (with current density being 92 mA/g), and discharge specific capacity can be maintained at 600 to 760 mAh/g after 50 cycles of charging and discharging at a current of 1C (with current density being 920 mA/g); and the negative electrode material of the lithium ion battery has high reversible capacity and good cycling stability.
Owner:TIANJIN UNIV

Preparation method for magnetic carbon-coated ferroferric oxide nano-composite material

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.
Owner:SOUTHWEST PETROLEUM UNIV

Ferroferric oxide/reduced graphene oxide composite wave-absorbing material with hollow hemisphere structure and preparation method

The invention discloses a ferroferric oxide/reduced graphene oxide composite wave-absorbing material with a hollow hemisphere structure, which is characterized in that ferroferric oxide nanoparticles with the hollow hemisphere structure are uniformly grown on the upper and lower surfaces of the reduced graphene oxide sheet to form a wave-absorbing material with a multi-layer composite structure and a nanosized thickness. The thickness of the composite wave-absorbing material is less than the range of 100 -1,000nm, which is the skin depth of ferromagnetic materials in a microwave frequency band. The invention also discloses a preparation method of the composite wave-absorbing material. The composite wave-absorbing material improves the content of ferroferric oxide in a composite material, has a thickness less than the skin depth of ferromagnetic materials in microwave frequency band, namely, 100-1,000nm, and effectively inhibits the skin dissipation of composite materials. The composite wave-absorbing material has light weight and good wave-absorbing property in actual utilization, not only can effectively absorb electromagnetic wave, but also can deflect and scatter radar waves, greatly improves the stealth effect in actual utilization, and completely meets requirements of a new wave-absorbing material of being thin, light, wide, and strong.
Owner:EARTH PANDA SUZHOU MAGNET +1

Magnetic composite material surface imprinting thermosensitive adsorbent, and preparation method and application thereof

The invention relates to the technical field of preparation of environment functional materials, in particular to a magnetic composite material surface imprinting thermosensitive adsorbent, and a preparation method and the application thereof. The method comprises the following steps that: firstly, a ferroferric oxide/nerchinskite nanotube magnetic composite material is prepared by a solvent thermal synthesis method; secondly, the magnetic composite material is modified on ethenyl by using 3-(methacrylo) propyltrimethoxyl silane; and finally, the nerchinskite nanotube magnetic composite material is prepared by using the ethenyl-modified magnetic composite material as a substrate material, 2, 4, 5-trichlorophenol as a template molecule, methacrylate as a functional monomer, N-isopropylacrylamide as a thermosensitive functional monomer, ethylene glycol dimethacrylate as a cross-linking agent, and 2,2'-azodiisobutyronitrile as an initiator. The prepared thermosensitive imprinting adsorbent is obvious in thermal stability and magnetic stability, sensitive in magnetic effect and thermosensitive effect, relatively high in adsorption capacity, obvious in reversible absorption/release function along with temperature and obvious in tertiary calcium phosphate (TCP) molecule recognition performance.
Owner:JIANGSU UNIV

Preparation method of functional magnetic absorbent used for treating industrial wastewater

The invention discloses a preparation method of a functional magnetic absorbent used for treating industrial wastewater. The method comprises the following four steps of: (1) preparing a ferroferric oxide nanocluster with a high magnetic saturation value by solvothermal synthesis; (2) modifying the ferroferric oxide nanocluster surface into a double-bond functional group by adopting a sol-gel process; (3) wrapping the ferroferric oxide nanocluster surface with a polymer shell containing an epoxy functional group in a distilling, precipitating and polymerizing manner; and (4) modifying a microsphere surface into an amino group or a carboxyl group through a ring-opening reaction of the epoxy group. The magnetic absorbent is high in functional group content, fast in magnetic responsiveness, easy for magnetic separation, regular in structure, stable in chemical and physical performances and high in dispersion stability in an aqueous solution; and the surface-modified amino and carboxyl functional groups can efficiently adsorb a plurality of heavy metals or organic pollutants, so that the magnetic absorbent can be applied to the field of industrial wastewater treatment. The preparation method is simple to operate and controllable in process and has a good application prospect.
Owner:JINGDEZHEN CERAMIC INSTITUTE

Chitose aquagel evoked original position synthesis of super-paramagnetism nano ferriferrous oxide particles

The invention provides superparamagnetic nano Fe3O4 particles synthesized through in-situ induction of chitosan hydrogels, relating to a method for synthesizing the superparamagnetic nano Fe3O4 particles. The invention solves the problems of serious aggregation of the nano Fe3O4 particles and the complicated method for inducing the chitosan into the surface of the Fe3O4 in the current nano Fe3O4 particles. The method of the invention is that: 1. the chitosan powder is added into dilute acid solution; 2. cross-linking agent is added to make the chitosan hydrogels; 3. the chitosan hydrogels are sequentially dipped in Fe3+ aqueous solution, water, Fe2+ aqueous solution and water, and a plurality of times of circular leaching are made so as to form the chitosan hydrogels that contains iron ions; 4. then basification treatment is carried out; 5. the hydrogels is dissolved or degraded again, and finally the black superparamagnetic Fe3O4 nano particles are obtained upon centrifugalization. The method of the invention requires simple technique and mild conditions and the equipment used in the method is simple and can be obtained easily, thereby mass production can be achieved. The average diameter of the particles is 15 to 25nm, and the particles distribute evenly with superparamagnetism.
Owner:HARBIN INST OF TECH

Synthetic method and application of metal-organic framework composite nanomaterial

The invention provides a synthetic method and application of a metal-organic framework (MOF) composite nanomaterial. The method comprises the following steps: dispersing ferriferrous oxide magnetic spheres which are synthesized through a traditional hydrothermal technology in a weakly alkaline solution of dopamine hydrochloride to carry out self-polymerization of dopamine on the surfaces of the magnetic spheres; and sequentially dispersing polydopamine coated magnetic spheres in a dimethylformamide solution of zirconium chloride and a dimethylformamide solution of 2-amino-terephthalic acid to obtain the MOF composite nanomaterial with the magnetic sphere surfaces coated with polydopamine and modified with an amino group and with zirconium as a center metal ion. The material has the advantages of large specific surface area, good hydrophilicity and suitable pore structure, can be applied to further researches of the proteomics, and can specifically enrich Which can specifically enrich phosphorylated peptide segments and glycopeptides; the synthetic method is simple and quick; and the synthesized material has good hydrophilicity and biocompatibility, and can be used for selectively enriching endogenous phosphorylation peptide segments and glycopeptide in complex biological samples.
Owner:FUDAN UNIV

Method for controlling morphology and performance of ferriferrous oxide

The invention discloses a method for controlling morphology and performance of a ferriferrous oxide and belongs to the technical field of inorganic materials. The method comprises the following steps of: dissolving ferric trichloride hexahydrate in ethylene glycol to prepare a solution of which the ferric trichloride concentration is 0.15-0.35mol/L; then, adding urea and a surface active agent; fully dissolving to obtain a homogeneous solution; transferring the homogeneous solution into a high-pressure reaction kettle with a polytetrafluoroethylene lining; performing a solvent thermal reaction at the temperature of 170-230 DEG C for 6-72 hours; performing centrifugal separation after the reaction is ended; washing deposits by using deionized water and alcohol; and then, drying in a drying oven to obtain a finished product. The method for controlling the morphology and the performance of the ferriferrous oxide has the advantages that the production cost is low; the preparation technology is safe and simple; the product controllability is strong; and toxic and harmful substances are not generated in the preparation process. The obtained ferriferrous oxide is high in purity and centralized in particle size distribution, and the morphology can be mutually converted among a spherical structure, a microporous structure and a hollow structure.
Owner:ZHONGBEI UNIV

Graphene-doped porous carbon/ferroferric oxide nano-fiber lithium battery anode material and preparation method thereof

The invention relates to a graphene-doped porous carbon/ferroferric oxide nano-fiber lithium battery anode material and a preparation method thereof. The preparation method comprises the following steps of preparing ferric salt and graphene-doped polyacrylonitrile/polymethyl methacrylate nano-fibers by utilizing electro-spinning technique, and obtaining the graphene-doped porous carbon/ferroferric oxide nano-fiber lithium battery anode material through pre-oxidization and high-temperature carbonization. The specific preparation method comprises the following steps of adding a certain amount of ferric salt and oxidized graphene into mixed solution of polyacrylonitrile/polymethyl methacrylate, obtaining electro-spinning solution after ultrasonic dispersion and high-speed stirring and dissolution, pre-oxidizing the nano-fibers obtained by electro-spinning at 200-300 DEG C, and obtaining the graphene-doped porous carbon/ferroferric oxide nano-fiber lithium battery anode material after carbonizing at 500-1000 DEG C. According to the graphene-doped porous carbon/ferroferric oxide nano-fiber lithium battery anode material prepared by the invention, the electrochemical performance can be effectively collaborative, and the specific capacity, the initial charge-discharge efficiency and the cycling performance of the battery are improved.
Owner:ZHONGYUAN ENGINEERING COLLEGE

Surface carboxyl-functionalized core-shell type magnetic composite microballoons and preparation method thereof

InactiveCN102432780APolymer sciencePolymer network
The invention specifically relates to surface carboxyl-functionalized core-shell type magnetic composite microballoons and a preparation method thereof, belonging to the technical field of functional materials. According to the invention, the core of the core-shell type magnetic composite microballoons is a magnetic ferriferrous oxide nanoparticle cluster, and the shell of the microballoons is a cross-linked carboxyl-containing polymer network. The preparation method comprises the following steps: at first, preparing the citric acid stabilized magnetic nanoparticle cluster (thereafter referred as magnetic cluster for short); then, modifying the surface of the magnetic cluster with active vinyl function groups by using the sol-gel method; finally, preparing the monodisperse core-shell type magnetic polymer composite microballoons which have high magnetic responsibility and contain abundant active carboxyl groups on their surface through distillation-precipitation polymerization. A variety of bioactive molecules can be bonded with the surface of the core-shell type microballoons through chemical modification for application in the field of biomedicine. Furthermore, the method can accurately control the thickness and cross-linking degree of the shell of polymers. The invention has the advantages of simple operation and controllable process and has a good application prospect.
Owner:FUDAN UNIV

Preparation method of urchin-like titanium dioxide magnetic microspheres having double-layer cavity structures

The invention provides a preparation method of urchin-like titanium dioxide magnetic microspheres having double-layer cavity structures. The method comprises the following steps of: preparing monodisperse ferroferric oxide magnetic microspheres with uniform particle sizes; (2) coating silicon dioxide and titanium dioxide in sequence on the surface of ferroferric oxide with a sol-gel method; (3) adjusting conditions such as the concentration of a sodium hydrate solution, hydro-thermal reaction time and the like to prepare urchin-like titanium-based magnetic microspheres having single/double-layer cavity structures; and (4) treating the titanium-based magnetic microspheres with a hydrochloric acid solution with a certain concentration, and calcining at high temperature to obtain anatase urchin-like titanium dioxide magnetic microspheres having double-layer cavity structures. A material prepared with the method has a high-activity anatase titanium dioxide crystal structure, an urchin-like surface and a large specific surface area; the double-layer cavity structures can accommodate a large quantity of guest molecules; the microspheres have superparamagnetism, and simple and quick separation and recovery of a catalyst can be realized; and the method has the advantages of low preparation cost, controllable process flow, easiness for operating, environmental friendliness and low energy consumption.
Owner:UNIV OF SCI & TECH BEIJING

Magnetic tumor double-target polymer nano micelle and preparation thereof

The invention relates to a nanomicelle of magnetic tumor double-targeting polymer and a preparation method thereof. The nanomicelle of magnetic tumor double-targeting polymer is a nuclear shell structure; the surface of an outer shell is connected with targeted ligand, an inner core is enclosed with nano-particles of super paramagnetic ferriferrous oxide and anticarcinogen with hydrophobic property; in virtue of the physical effect of an external magnetic field and induction of the targeting ligand, the tumor double-targeting function of the nanomicelle is realized. The invention also provides the preparation method of the nanomicelle of magnetic tumor double-targeting polymer: polyethylene glycol with end capping by folacin, and poly Epsilon-caprolactone or sandwich copolymer of poly propiolactone are taken as raw materials and enclosed with the nano-particles of super paramagnetic ferriferrous oxide and the anticarcinogen with hydrophobic property, and then dialysed to obtain the nanomicelle of magnetic tumor double-targeting polymer. The drug carrier system of the nanomicelle reinforces the treatment effect of the anticarcinogen with hydrophobic property on tumor, prolongs the circulating time of the anticarcinogen in human body, intensifies the targeting action of drugs, improves the release efficiency and partial concentration of drugs, and reduces the dosage and toxic and side effect of drugs.
Owner:SUN YAT SEN UNIV

Method for preparing algae base magnetic activated carbon material and application of algae base magnetic activated carbon material

The invention discloses a method for preparing an algae base magnetic activated carbon material and the application of the algae base magnetic activated carbon material. According to the method, the preparing process and the magnetizing process of the activated carbon material are synchronized, a one-pot mode is adopted, drying, smashing, sieving and other preprocessing and activating processes are not needed, the steps of washing, drying and activator removing and the like are not needed after carbonization, a ferric salt solution is directly carbonized into ferroferric oxide nanometer particles in the preparing process, the ferroferric oxide nanometer particles are loaded to the surface of the activated carbon material, the operation is simple and easy to carry out, the preparing period is short, cost is low, mass production can be achieved, and due to the fact that the environmental pollutant of blue algae is utilized in the preparing process, dual environment benefits are achieved. The prepared algae base magnetic activated carbon material has large specific surface area and porosity, can efficiently adsorb methylene blue or methylene blue or bisphenol A in wastewater, has superparamagnetism and can be quickly separated from a liquid phase system after adsorption, and recycling is facilitated.
Owner:南京嘉美清丽环境科技有限公司

Mono-layer oxidized mineral carbon and ferriferrous oxide composite material as well as preparation and application

The invention relates to a monolayer graphite oxide and magnetic ferroferric oxide nano-particle composite hybrid material, and a preparation method and application thereof. The monolayer graphite oxide and magnetic ferroferric oxide nano-particle composite hybrid material is made from raw materials of monolayer graphite oxide material and a mixture of bivalent malysite and ferric malysite by a chemical deposition method. The preparation method comprises the steps as follows: the monolayer graphite oxide is dispersed in sodium hydroxide aqueous solution to obtain monolayer graphite oxide with sodium carboxylate; then ion exchange is carried out on the mixture of monolayer graphite oxide and the bivalent malysite and the ferric malysite under the protection of nitrogen; the processed mixture is deposited by sodium hydroxide solution after excessive malysite is removed to obtain a solid product; and the solid product is separated out and dried to obtain superparamagnetic monolayer graphite oxide and ferroferric oxide nano-particle composite hybrid material. The material is used for loading drug to obtain an efficient controllable targeted drug carrier with the magnetic property of pH response. The invention has wide application prospect in the aspects of multiple targeted drug delivery, and the separation, the purification, the inspection and the like of nuclear magnetic resonance contrast medium, DAN, protein, etc.
Owner:TIANJIN MEDICAL UNIV

Carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent and preparation method and application thereof

The invention discloses a carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent and a preparation method and application of the carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent. The adsorbent comprises a carbon nanotube and multi-stage nanometer ferroferric oxide loaded on the carbon nanotube, wherein the ferroferric oxide has the grain size of 30 to 80 nanometers and mass fraction of 25 to 35%. The preparation method of the adsorbent comprises the following steps in sequence: mixing the oxidized carbon nanotube with an organic reducing agent and an organic iron compound; transferring the mixture into a reacting kettle; thermally synthesizing through an in-situ solvent in an oil bath under an inert atmosphere at reaction temperature of 180 to 270 DEG C and pressure of 0.1 to 2.0 MPa; cooling the reacting product; washing; and drying in vacuum to obtain carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent. The carbon-nanotube-loaded multi-stage nanometer ferroferric oxide adsorbent disclosed by the invention is high adsorbing performance and easy to separate and recovery; and the preparation method is simple and low in cost, and has a wide application prospect in the field of adsorbing heavy metal ions and organic pollutants from the wastewater.
Owner:CHANGSHA RES INST OF MINING & METALLURGY
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