1698 results about "Magnetic composite" patented technology

The invention discloses a magnetic composite nano microsphere capable of emitting fluorescent light and a preparation method thereof, which belong to the inorganic nanophase material field. The preparation method comprises the following steps: firstly, the sol-gel method or the reversed phase microemulsion method is adopted for performing base catalysis on alkyl silicate, and a layer of silicon dioxide is uniformly coated on the surface of inorganic magnetic nano particles; secondly, an amino silane coupling agent is adopted for performing surface finish on silicone dioxide; thirdly, semiconductor quantum dots are absorbed on the surface of the silicone dioxide through the electrostatic action between an amino group and a carboxyl group on the surface of the amino silane coupling agent; and fourthly, the magnetic composite nano microsphere with a core-shell structure capable of emitting the fluorescent light is obtained. The preparation method has easy obtained raw materials and low cost. The composite nano microsphere obtained has good stability, controllable grain size, narrow distribution, and has good magnetic responsivity and performance of being capable of emitting the fluorescent light, and the two performances are controllable. The magnetic composite nano microsphere and the preparation method can be applied in the fields of biomedicine, bioengineering, etc. including immunoassay, biological labeling and separation, cell imaging and so on.

The invention belongs to the technical field of bioseparation material, in particular to a magnetic composite microsphere with nucleocapsid structure and a preparation method thereof. Nano ferroferric oxide decorated by oleic acid is firstly used as raw material, and is polymerized through template fine emulsion so as to prepare the monodisperse magnetic composite microsphere with high magnet content; and then the monodisperse micosphere is polymerized through seed emulsion and is added with different amount of shell monomer to prepare the magnetic composite microsphere with the nucleocapsid structure and the magnet content of 20wt percent to 80wt percent. The grain size of nucleocapsid composite microsphere is in narrow distribution, and the magnet content of the microsphere is controllable and the surface has functional reactive group; therefore, the microsphere of the invention can be surface-modified into a magnetic carrier of biological active molecule by chemical crosslinking to be applied in the biomedicine field. The method of the invention can be simply operated and the process of which can be controlled, thus having industrialized prospect.

The invention provides a novel magnetic porous metal-organic skeleton (Fe/C@ MOF) composite absorbent and a preparation method thereof. Biomaterials which are extensive in source and low in price are served as the carbon source; the Fe<3+> ions are served as the precursor of the magnetic material; under the microwave-assisted condition, magnetic Fe/C material is quickly synthesized; then, the method of self-assembly layer by layer is adopted, so as to alternately deposit metal central ions and organic ligands on the surface of the magnetic Fe/C material and achieve the in-situ synthesis of the MOF; the magnetic Fe/C@ MOF composite is prepared. The preparation method provided by the invention is simple in the preparation technology; moreover, the prepared magnetic Fe/C@MOF composite has the advantages of large specific surface area, high adsorption capacity, capability of magnetic separation, reutilization and the like. The prepared composite simultaneously has the capability of adsorbing and removing organic dye and heavy metal ions. Therefore, the prepared composite has favorable application prospects in the fields of environmental remediation, wastewater treatment, separation science and the like.

A transformer for low frequency applications of from 50 Hz to 1000 Hz is described. The transformer comprises a core having a cylindrical symmetry around a main revolution axis. The core is formed of a soft isotropic magnetic composite material composed of iron and resin. Windings are enclosed in the magnetic core and disposed about a central column of the magnetic core and magnetically coupled with the inductor for low frequency applications, DC to 1000 Hz of similar construction is also described, the inductor comprises a core having a cylindrical symmetry around a main revolution axis. The core is formed of a soft isotropic magnetic composite material composed of iron and resin. Winding is enclosed in the magnetic core and disposed about a central column of the magnetic core and magnetically coupled with the magnetic core. The core is formed by core sections.

The present invention concerns a new ferromagnetic powder composition comprising soft magnetic iron-based core particles wherein the surface of the core particles are surrounded by an insulating inorganic coating, and a lubricating amount of a compound selected from the group consisting of silanes, titanates, aluminates, zirconates, or mixtures thereof. The invention also concerns a process for the preparation of soft magnetic composite materials using the new powder composition.

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 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.

The magnetic composite material of the present invention is used as a working substance in the magnetic refrigeration system and comprising at least two phases, including, a first phase composed of an intermetallic compound represented by a general formula: La(Fe(Co, Ni)Si)₁₃, having an NaZn₁₃ type crystal structure, and a second phase is composed of an iron alloy containing Si. The first phase is precipitated in an expansion size of 100 μm or less in average. Preferably, the magnetic composite material contains Fe as a principal component, La in an amount from 4 atomic % to 12 atomic %, Si in an amount from 2 atomic % to 21 atomic %, and Co and Ni in a total amount from 0 atomic % to 11 atomic %, and the total amount of Fe, Co and Ni being from 75 atomic % to 92 atomic %.

The invention belongs to the technical field of functional materials and particularly relates to covalent organic frame magnetic composite microspheres of core-shell structure and a preparation method of microspheres. Cores of the core-shell type composite microspheres are ferroferric oxide magnetic particles, and shells are covalent organic frames of ordered porous structures. The preparation method includes the steps that the ferroferric oxide magnetic particles are prepared through the solvothermal method; core-shell type magnetic composite microspheres are obtained through aldimine condensation reaction; under the solvothermal condition, the core-shell type magnetic composite microspheres in a formless and disordered channel state are induced to be converted into highly crystallized covalent organic frames with ordered channels, and the covalent organic frame magnetic composite microspheres with the excellent porous property are obtained. The composite microspheres have the advantages of being uniform in size, high in dispersity, high in mangnetic responsiveness, high and ordered in porosity and the like. The preparation method is simple, the process is controllable, and the size and the appearance of the composite microspheres are kept unchanged. The composite microspheres and the preparation method have wide application prospects in the fields of catalysis, drug loading, molecular sensing, energy storage and the like.

The invention relates to a soft magnetic composite material, in particular to a soft magnetic composite material of organic/inorganic insulator-coated ferrous powder and a process for preparation by sol-gel. In the soft magnetic composite material of organic/inorganic insulated-coated ferrous powder, the soft magnetic composite material comprises insulation material coated ferrous powder, wherein the quantity of the insulation material is 0.05%-1.5% of quality of the coated ferrous powder according to percentage by weight, the insulation material uniformly and dispersedly compounded by materials containing sol and polymer of silicon dioxide, and the polymer is 5%-30% of the insulation material in accordance with percentage by weight. The invention has the advantages that 1) the sol of silicon dioxide is generated in-situ of the solution and coated on the surface of the ferrous powder, 2) by employing the organic/inorganic insulator to coat the ferrous powder, combining the advantages of organic and inorganic coatings, the coating effect and mechanical property of insulated layers is excellent, and 3) the technique is simple and cost is low.

An inductor component has a plurality of layers of spiral wirings a magnetic composite body directly or indirectly covering the plurality of layers of spiral wirings and made of a composite material of a resin and a metal magnetic powder with an average particle diameter of 5 mum or less an internal electrode embedded in the magnetic composite body with an end surface exposed from an outer surface of the magnetic composite body, the internal electrode being electrically connected to the spiral wirings, and an external terminal disposed on the outer surface of the magnetic composite body and electrically connected to the internal electrode.

Electric motor components, such as a plurality of electromagnetic poles of an annular stator, are formed of soft magnetic composites comprising compacted, electrically isolated iron alloy particles. Embodiments comprise predetermining particular alloy compositions and processing conditions, such as compaction pressures and temperatures, and post compaction heat treating temperatures and atmospheres, for an intended mode of operation, thereby improving manufacturing efficiency and reliability in tailoring soft magnetic composite components for particular design situations.

Disclosed herein is a magnetic paste that generally includes a magnetic component and a liquid organic component. The magnetic component includes a plurality of discrete nanoparticles, a plurality of nanoparticle-containing assemblies, or both. Magnetic devices can be formed from the magnetic paste. Methods of making and using the magnetic paste are also described.

The invention discloses a molecularly imprinted magnetic microsphere, a preparation method and an application thereof. The preparation method comprises the following steps: S1, adopting a coprecipitation method to prepare Fe3O4 nanometer particles; S2, adopting a microemulsion polymerization method to prepare a magnetic composite microsphere by virtue of the Fe3O4 nanometer particles; S3, adopting a sol-gel method to grow SiO2 on the surface of the magnetic composite microsphere to obtain a core-shell microsphere; S4, grafting C=C double bond on the surface of the core-shell magnetic microsphere; and S5, adopting a substitution template method on the surface, which is grafted with the C=C double bond, of the core-shell microsphere to carry out molecular imprinting operation to obtain the molecularly imprinted magnetic microsphere. DMIP (Dimethyl Isophthalate) prepared by the method provided by the invention has excellent superparamagnetism and excellent selectivity for target molecules.

A magnetic composite nano-TiO2 photocatalyst able to be recovered magnetically is prepared by sol-gel method. It is composed of Fe3O4 as core, SiO2 as isolating layer and TiO2 as coated layer. It has excellent soft magnetic property, high photocatalyst activity, and high degradability to methyl orange.

The invention discloses an emergency restoring process for pollution of a water body, substrate sludge and a mud flat by heavy metal. A complex agent is first added to the water body, and most heavy metal ions in ionized and absorbed states are converted into dissolved complex ions; short fibers and a heavy metal capturing agent are added to the water body so as to convert the heavy metal complex ions into suspended matters, and then a flocculating agent is added to flocculate the suspended matters; a flocculation assisting agent is added to the water body to form a fiber enhanced flocculating body; an Mg/magnetic composite material prepared by magnetic substances and magnesium powder in advance is thrown into the water body so as to lead the fiber enhanced flocculating body to capture air bubbles and float to the water surface; finally, the fiber enhanced flocculating body is captured to carry out emergency restoration. The emergency restoring process is convenient for in-situ emergency restoration of the stormy wavy water body in a large scale, so as to avoid the disadvantages that the present biological restoring method leads to slow treatment and is limited by the biological living environment in the aspect of the application range, thereby not only solving the problem of secondary sedimentation pollution caused by the present chemical restoring method, but also solving the bottleneck problem that the present dissolved air floatation process cannot carry out entire water-area pipe laying operation.

The invention discloses a preparation method for inorganic-organic composite adhesive-coated soft magnetic composite. The preparation method for the inorganic-organic composite adhesive-coated soft magnetic composite includes steps that (1) mixing metal magnetic powder according to particle size distribution; (2) passivating the prepared magnetic powder of the step (1) through passivator; (3) using the adhesive composed of organic adhesive and inorganic adhesive to coat the passivated magnetic powder particles of the step (2); (4) pressing the bonded magnetic powder of the step (3) to obtain a magnetic powder core; (5) carrying out heat treatment on the pressed magnetic powder core of the step (4), and spraying to obtain a target product. The preparation method for the inorganic-organic composite adhesive-coated soft magnetic composite enables the compounding effect of the organic adhesive and inorganic adhesive to be improved and integrates advantages of the organic adhesive and inorganic adhesive; the inorganic-organic composite adhesive-coated soft magnetic composite is reasonable in component selection, is good in use effect and has good insulating bonding effect for iron-base metal soft magnetic powder, nickel-base metal soft magnetic powder and other metal soft magnetic powder with other components. The magnetic powder core made from the inorganic-organic composite insulating adhesive has excellent magnetic property and mechanical performance.

Provided is a wideband electromagnetic wave (EMW) absorber including a magnetic composite having a structure in which magnetic particles are dispersed in a polymer resin, and a plurality of conductive lines arranged in the magnetic composite, and a method of manufacturing the same. The wideband EMW absorber can be used for a device configured to emit EMWs and effectively absorb wideband EMWs.

This invention belongs to nanometer compound materials process and application technique field and to one carbon nanometer tube and ferriferous oxide compound materials process. This invention discloses one nanometer ferriferous oxide to cover carbon nanometer magnetic compound materials. This invention can process carbon nanometer tube in aqua forties for regurgitation and its surface leads in carbonyl, hydroxyl group and carboxyl group function groups, wherein, under outer magnetic field, the groups can be absorbed onto nanometer tube surface Fe3+ and Fe2+ with OH-1 to generate deposition reaction.

The invention belongs to the field of the synthesis of magnetic nano materials, and relates to a method for preparing a silicon dioxide magnetic composite microballoon with a core-shell structure. The method comprises the following steps: adding magnetic iron oxide nano particles monodispersed in water into the mixing solution of alcohol and ultrapure water, and stirring for 0.3-2h; then adding 0.01-1ml of tetraethyl silicate in the mixture, and stirring for 0.3-2h; then adding 0.5-5ml of stronger ammonia water, continuing to stir for 2-24h, and obtaining the solution of the silicon dioxide magnetic composite microballoon with the core-shell structure; and using applied magnetic field for separating the microballon from the solution. In the invention, by proportioning the quantity of the reactant reasonably, and setting the reaction conditions reasonably, one or a plurality of the iron oxide magnetic nano particle(s) are covered in each produced silicon dioxide microballoon, and the microballoon has good balling performance and monodispersity, has controllable shell layer thickness and narrow particle size distribution, and is easy to clean, simple and convenient in operation, low in cost, less in waste, and high in productivity.

A flexible piezo-magnetic composite material and its production are disclosed. It consists of non-crystalline and/or nanometer crystal soft magnetic powder material with grain size 0.1-200 mum, flexible polymer and auxiliary additive ingredients. It can be used to inspect contact stress during casing and pipeline assembly curved profiled structure connection and impact process of large equipments and sophisticated engineering; it can be used to real-time monitor usage performance, relating components and functional material ageing and stress of system when they are mounted, stored and transported. It can be used in biological technology, medicine, sports, vehicles and aerospace industries.

The invention provides a composite photocatalytic material, a preparation method and an application of the composite photocatalytic material. The preparation method comprises: obtaining a precursor of g-C3N4 through high-temperature calcination; preparing a magnetic composite of Fe3O4/g-C3N4 through hydrothermal deposition; and allowing the magnetic composite to react in a solution of silver nitrate through a thermal photodeposition method to obtain the composite photocatalytic material of Ag/Fe3O4/g-C3N4. The composite is high in dispersion and activity, can degrade tetracycline in the environment, and has characteristics of simple synthesis and high degradation rate.