895results about "Organic/organic-metallic materials magnetism" patented technology

The invention relates to a multifunctional double-layer core-shell structure magnetic nano particle. In the invention, a magnetic nano particle with a particle size of 1-300 nm is used as a core and coated with a double-layer shell consisting of a SiO2 layer with a thickness of 1-200 nm and a hydrolyzed silane coupling agent layer is 1-100 nm thick and comprises one or more multifunctional groups; the particle size and the shell layer thickness can be controlled through regulating the volumes, the weight ratios and the reaction time of the magnetic core, a silicon dioxide precursor, a silane coupling agent and a catalyst in a preparation process; the total particle size of the nano particle can be as small as 5-50 nm and as large as 700-800 nm; the nano particle can have superparamagnetism, paramagnetism and ferromagnetism according to the change of the magnetic core particle size; and one or more bioactive molecules can be connected into the shell layer of the magnetic nano particle or to the surface of the shell layer through a chemical method or a physical method. The invention also provides a preparation method of the multifunctional double-layer core-shell structure magnetic nano particle and application thereof. The particle preparation method has the advantages of simplicity, moderate condition, low cost and easy realization of industrial production. The nano particle can obtain different functions through connecting different bioactive molecules and can be applied to the fields of protein enrichment, biological detection, separation and purification, targeted drug carriers, cell imaging and medical imaging.

In a production method for producing molded articles from fiber composites, superparamatic particles are selected which become coupled to an external alternating magnetic field. These superparamagnatic particles are added to a resin portion of a strip-shaped starting material further comprising reinforcing fibers. The strip-shaped starting material is then continuously advanced, and, while being advanced, heated by coupling-in an external alternating magnetic field to which the superparamagnatic particles in the resin portion become coupled. Next, the heated starting material is continuously molded into a molded article; and the resin portion in the molded particle is cured.

The invention relates to a preparation method and application of a magnetic silicon dioxide composite microsphere. Superparamagnetic ferroferric oxide nano particles of which the diameter ranges from 4 nm to 30 nm are prepared through a high-temperature pyrolysis method, a silicon dioxide shell of which the thickness ranges from 5 nm to 20nm covers the outer surfaces of the magnetic ferroferric oxide nano particles through a reverse microemulsion method, amination modification is conducted on the silicon dioxide surface, glutaraldehyde is used as a crosslinking arm, ligand protein is connected into, and protein separation is conducted through specific binding of ligand protein and target protein. The prepared magnetic microsphere is small in particle diameter and good in monodispersity, the composite microsphere with amine is large in specific surface area, nucleophilic addition is utilized, after the crosslinking arm glutaraldehyde is connected into, multiple kinds of ligand protein can be connected into, and then multiple kinds of target protein can be separated. The method is suitable for rapid separation and application of protein in biological samples, and has wide application prospect and great application value in the biomedical field and other fields.

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.

Preparation of chitosan magnetic microsphere and preparation of immobilized yeast for magnetic microsphere. The invention adopts suspended emulsion polymerization to prepare chitosan magnetic microsphere. The invention immobilize yeast cell to magnetic microsphere by swelling absorption. The inventive chitosan magnetic microsphere has characteristics of both magnetic particle and macromolecular material. Immobilized yeast cell is not discharged out of the system with fermentation broth, so that consumption is avoided, concentration of yeast cell in the fermentor is kept, rate of alcoholic fermentation is enhanced, fermentation time is shorten, resource consumption is reduced, while reducing discharge of waste water, and hardness to process the waste water.

The invention relates to magnetic fluorescent microspheres and a preparation method thereof. The particle size of the magnetic fluorescent microspheres is 5-10 mu m, the fluorescence excitation wavelength range is 400-700nm, and the fluorescence intensity is not reduced within 24h. The prepration method comprises the following steps: adding a swelling agent into monodisperse carboxylated polystyrene microspheres, and adding magnetic nano microparticles into a swelling system; shaking on a decolorization shaker for 12-48h; using mixed solution of cyclohexane and ethanol for cleaning sediment, and sequentially carrying out ultrasonic dispersion and centrifugal separation till supernatant liquid is colorless under an ultraviolet lamp; and saving a final sediment product in 1ml of liquor. Compared with the existing magnetic fluorescent microspheres, the magnetic fluorescent microspheres have the advantages of uniform and controllable diameter, good fluorescence stability, simple preparation process, multiple types of fluorescence codes and the like, and can not only carry out fast separation and purification on reactants by being applied in the biological macromolecular detection, but also simultaneously detect a plurality of target molecules in a sample to be detected in a reaction tube and a hole, thereby being widely applied in the fields of immunoassay, nucleic acid hybridization, genotype analysis and the like.

The invention relates to a preparation method of a magnetic microsphere with surface functional groups in the composite material technical field. Under the condition that magnetic nanometer particles exist, dispersion-polymerization is performed; during dispersion-polymerization functional monomers are added to make the surfaces of the magnetic nanometer particles carry functional groups, or/ and after finishing the dispersion-polymerization the magnetic microsphere is sulfonated to make the surfaces carry tetrafunctional groups; finally magnetic polymer microsphere solution is gotten, and then the magnetic polymer microsphere solution is magnetically separated, cleaned and dried to get a magnetic microsphere with surface functional groups. The magnetic microsphere has an advantage that the particle size and the surface functional groups are controllable. The invention has the advantages of simple and accurate method, high efficiency, low cost, and capability of application in the biology field.

The invention relates to a multifunctional nano composite material in a core-shell structure, specifically relates to a carbon quantum dot magnetic and fluorescent difunctional nano material and a preparation method thereof, and belongs to the field of preparation of materials. The carbon quantum dot magnetic and fluorescent difunctional nano material which takes magnetic particles Fe3O4 as a core, chitosan and polyanionic cellulose as a shell material and carbon quantum dots as a fluorescent material is obtained by a self-assembling method layer by layer. The preparation method comprises the following steps: after synthesizing a magnetic fluid nano Fe3O4, preparing carbon quantum dots; then, preparing Fe3O4@CS/CDs; finally, preparing the carbon quantum dot magnetic and fluorescent difunctional nano material through the self-assembling method layer by layer. The carbon quantum dot magnetic and fluorescent difunctional nano material is good in biocompatibility and stability and adjustable in magnetism and fluorescence intensity.

The invention provides magnetic rubber with high magnetic induction intensity and the preparation method thereof, which belongs to the composite material technology field. The invention solves the problems in the prior production process that the production cost is high, the magnetic induction intensity of the produced special magnetic rubber product is low, and the elasticity performance is poor. The magnetic rubber with high magnetic induction intensity is made of ferromagnetic oxide powder, natural rubber, plasticizer, accelerator, activator, antioxidant and stearic acid which are prepared. The preparation method comprises the following steps: step A, grinding and blending; step B, rubber refining; step C, moulding, and step D, charging magnetism. The magnetic induction intensity of the magnetic rubber special product reaches above 600 gauss, and the elasticity performance is good; the preparation method and process is simple, and the production cost is low.

The invention relates to a preparing method ofa nano-magnetic polymer composite microsphere, which comprises the following steps: preparing a hydrophilic Fe3O4 magnetic liquid particle by using a chemical co-precipitation method; dissolving initiating agents and emulsifying agents by weight part into ionized water to prepare water phase, adding the hydrophilic Fe3O4 magnetic liquid particle and adding a monomer to obtain nano-magnetic seed emulsion through polymerization; dissolving initiating agents by weight part into ionized water, adding the nano-magnetic seed emulsion and then adding a monomer to obtain nano-magnetic polymer composite microsphere emulsion through polymerization; the emulsifying agents are sodium lauryl sulfate, sodium dodecyl sulfate or sodium dodecyl benzene sulfonate; the initiating agents are potassium peroxydisulfate, ammonium persulphate or sodium peroxydisulfate; the initiating agents are potassium peroxydisulfate, ammonium persulphate or sodium peroxydisulfate; the hydrophobic monomer is styrene or methyl methacrylate or a mixture of the styrene and the methyl methacrylate; the nano-magnetic polymer composite microspheres prepared by adopting a seed emulsion polymerization method have the superparamagnetism, have stronger magnetic responsiveness, have no uncoated magnetic particle and contain magnetic polymer microspheres and are narrow to distribute.

The invention relates to a magnetic thermometer nm particle with biocompatibility, which has biocompatibility, and double response properties of magnetism and thermometer property, and the particle diameter thereof is 20 to 60 nm, and the magnetic responsibility is strong, and magnetic saturation intensity is 10.0 to 27.0 emu/g. The synthetic method of the magnetic thermometer nm particle with biocompatibility comprises: firstly, adopting chemical coprecipitation method to prepare magnetic Fe3O4 nm particle, and using silane coupler to hold surface modification, and then using the modified magnetic Fe3O4 nm particle as a seed, and having polyreaction with dextran, N-isopropyl acrylamide, finally obtaining the magnetic thermometer nm particle with biocompatibility. The magnetic thermometer nm particle with biocompatibility synchronously has double responses of magnetism and thermometer property, and has wide application prospect in the fields of drug release, protein and enzyme separation.

An aspect of the present invention relates to a method of modifying a surface of a powder, comprising mixing a powder with a heterocyclic compound comprising at least one hydroxylic group and/or carboxylic group. The present invention further relates to a magnetic recording medium and a coating material.

The invention discloses a preparation method of a novel rubber magnet. The method comprises the steps: magnet powder, rubber and additive are mixed to make compound according to a certain proportion, wherein, the proportion of the magnet powder taking up the weight of the compound is not less than 90 percent. The compound is put into a mixing device to be evenly mixed to make magnet powder compound. The powder compound is put into dies and is heated together with the dies to form molding objects under the pressurized condition of a pressure device. Furthermore, the heating temperature is kept between 120 DEG C and 200 DEG C and the pressure under the pressurized condition is 0.5 t/cm²-5t/cm². The products are finally made by demoulding the molding objects. The invention discloses a novel rubber magnet, and the magnet content of the novel rubber magnet is up to over 90 percent.

The invention discloses a functionalized grapheme/superparamagnetic ferroferric oxide nano particle composite material and a preparation method of the functionalized grapheme/superparamagnetic ferroferric oxide nano particle composite material, and belongs to the technical field of grapheme magnetic composite materials. The functionalized grapheme/superparamagnetic ferroferric oxide nano particle composite material solves the technical problems that a grapheme/superparamagnetic ferroferric oxide nano particle composite material is poor in hydrophilia and can not modify a functional group easily in the prior art. According to the composite material, superparamagnetic ferroferric oxide nano particles are loaded on the surface of functionalized grapheme, the diameter of the particles is smaller than 30nm, and the functionalized grapheme is polyacrylamide functionalized grapheme, or polyacrylic acid functionalized grapheme, or polymine functionalized grapheme, or tween-20 functionalized grapheme. Not only is the diameter of the particles smaller than 30nm, but also the composite material has the superparamagnetic characteristic and the strong external magnetic field correspondence, can be dispersed in a water solution excellently, and can further modify biological giant molecules.

The invention provides high-density carboxyl modified magnetic microspheres and a preparation method thereof. The preparation method comprises the following steps: preparing amino modified magnetic microspheres; and mixing the amino modified magnetic microspheres with organic carboxylic acid, and then adding EDC and NHS to react for 1-3 hours so as to obtain the high-density carboxyl modified magnetic microspheres. The carboxyl groups on surfaces of the magnetic microspheres provided by the invention have a characteristic of high density, and meanwhile, the carboxyl groups on the surfaces of the carboxyl modified magnetic microspheres provided by the invention are coupled with the magnetic microspheres through amino groups, and the spatial arm length of the carboxyl modified magnetic microspheres is longer than that of general carboxyl modified magnetic microspheres, therefore, the density of the carboxyl groups that can be arranged on the surfaces of the magnetic microspheres is higher. The raw materials of the high-density carboxyl modified magnetic microspheres provided by the invention is simple and easy to obtain, the cost is low, the process steps are simple, and the high-density carboxyl modified magnetic microspheres have very strong practicability.

The invention specifically relates to a preparation method for a magnetic cellulose-chitosan composite microsphere, which belongs to the field of a natural high polymer material. The preparation method comprises the following steps: with ionic liquid as a solvent, adding cellulose and chitosan into the ionic liquid and carrying out heating and stirring to prepare a cellulose-chitosan/ionic liquid solution; then adding a magnetic inorganic substance particle into the cellulose-chitosan/ionic liquid solution and carrying out mechanical stirring to allow the particle to be uniformly dispersed; and dispersing a magnetic cellulose-chitosan/ionic liquid composite solution obtained after uniform mixing in an organic solution containing an emulsifier, carrying out mechanical stirring until the composite solution is dispersed to form uniform microspheres, adding a curing agent to allow the microspheres to be shaped and carrying out separation to obtain the magnetic composite microsphere. According to the invention, the solvent is nontoxic, safe and environment-friendly; the preparation method is simple and has short process flow; the prepared microsphere has properties like biodegradability and magnetism and can realize functionalization because the surface of the microsphere has an amino group.

A magnetic composite body comprising magnetic nanoparticles having a number average particle diameter of 1 to 50 nm and having a compound represented by formula (I) fixed on their surfaces, and a method comprising bringing the magnetic composite body into contact with a test piece followed by magnetic separation:

R¹O—(CH(R²)CH₂O)_n-L-X   Formula (I)

wherein R¹ represents a hydrogen atom, an alkyl or alkenyl group having a carbon chain length of 1 to 20, or a substituted or unsubstituted, aryl or heterocyclic group; R² represents a hydrogen atom or a methyl group; L may be present or not present, and, when L is present, L represents an alkylene or alkenylene group having a carbon chain length of 1 to 10 which may have a branched chain or a substituent; X represents a hydrogen atom, a carboxylic acid group, a phosphoric acid group, or a sulfonic acid group; and n represents an integer of 1 to 10

The invention provides core-shell magnetic particles comprising a magnetic core and a functional shell, methods for making same, methods of separation using same, methods for using same, and devices comprising same. The particles and methods of the invention are useful for targeting and removing substances of interest that may be found in complex mixtures.

The invention relates to a rare-earth organic coordination polymer, and a preparation method and application thereof. The rare-earth organic coordination polymer has the following chemical formula: {(bpy)[Re(ip)1.5(H2O)4]}n, wherein bpy is 4,4'-bipyridyl, ip is isophthalic acid divalent negative ions, Re is one or more of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, Y and the like,and n is degree of polymerization. A hydro (solvent)-thermal synthesis method is used for preparing the rare-earth organic coordination polymer, is environment-friendly and easy to operate, low in cost and high in yield, and is suitable for large-scale industrial production. The prepared rare-earth organic coordination polymer has the good application prospects in fields of luminescence, catalysis, adsorption, magnetism, ion exchange, high polymer material aids and the like.

The invention discloses a PEN and Fe(CO)5 composite magnetic material and a preparation method thereof, and belongs to the technical field of magnetic polymer materials. PEN serves as an organic matrix, Fe(CO)5 serves as an inorganic filler, and the composite magnetic material is obtained after blending and prilling. Firstly, the Fe(CO)5 is subjected to surface modification, and a layer of phthalonitrile prepolymer is generated on the surface of the Fe(CO)5; due to a layer of organic matters rich in cyan coated on the surface, the Fe(CO)5 after surface modification can improve the interfacial adhesive force between the Fe(CO)5 inorganic filler and the PEN organic matrix, so that the PEN and the Fe(CO)5 are provided with a high-strength magnetic property while maintain an excellent mechanical property of the PEN after composition. According to the magnetic material and the preparation method thereof, the Fe(CO)5 can be filled as much as possible on the premise that the good mechanical property of the composite material is maintained, so that magnetic saturation strength of the composite material can be improved, the compatibility of inorganic fillers with polymers is improved, and processing defects are overcome.

The invention relates to magnetic polyurethane elastomer composites, in particular to a preparation method of high-performance magnetic polyurethane elastomer composites, and aims to solve the problem that the mechanical and magnetic properties of magnetic elastomer composites are difficult to be optimized simultaneously, wherein the solution is that the preparation method comprises the following steps: preparing Fe3O4 water-based magnetic fluid by a chemical coprecipitation method, and preparing graphene @ Fe3O4 composite magnetic particles by adsorption; purifying and dispersing the graphene @ Fe3O4 composite magnetic particles in an organic solvent to obtain graphene @ Fe3O4 composite organic magnetic fluid; taking graphene @ Fe3O4 composite organic magnetic fluid as one of the main raw materials to prepare graphene @ Fe3O4 polyurethane elastomer composites by a magnetic controlled in-situ polymerization method. The preparation method of high-performance magnetic polyurethane elastomer composites has the advantages that the problem of easy aggregation of functional fillers in the preparation and forming process of composites is solved, the dispersion and distribution of functional particles in polymer matrix are improved and controlled, graphene is introduced to improve the mechanical and magnetic properties of magnetic elastomer composites simultaneously, and the magnetic elastomer composites have excellent mechanical and magnetic properties.

The invention belongs to the field of porous and magnetic high polymer materials and particularly relates to porous and magnetic anisotropy microspheres and a preparation method thereof. According to the preparation method of the porous and magnetic anisotropy microspheres, double water-in-oil-in-water (W/O/W) Pickering emulsion serves as a template, aqueous phase dispersion of magnetic iron oxide serves as an inner aqueous phase, oil-solubility polymerizable monomers and an initiator serve as oil phases, and pure water serves as an outer water phase; two solid particles with different hydrophilicity and hydrophobicity serve as emulsifier of inner and outer interfaces; and the obtained double Pickering emulsion is polymerized at a certain temperature under the action of a magnetic field, thus obtaining the porous and magnetic anisotropy microspheres. The method disclosed by the invention is simple to operate, high in efficiency and controllable in particle size. The porous and magnetic anisotropy microspheres not only have a unique porous distribution structure, but also have uniqueness on distribution of the magnetic iron oxide, and have wide application prospect in slow release of targeted medicines as well as in the field of function materials such as ordered porous membranes.