46results about How to "Has superparamagnetic properties" patented technology

The invention provides a preparation method of a magnetic-functionalized graphene composite material, and relates to preparation of a graphene composite material. According to the invention, the preparation method is simple, the raw material is easily obtained, and the industrial production is easy; the prepared magnetic-functionalized graphene composite material has superparamagnetic property and is higher in saturated magnetization; and the graphene carrier is good in conductivity, and loaded ferroferric oxide nano particles are uniformly distributed, are small and are good in crystallizability. The preparation method comprises the following steps of: matching ethanediamine and water into a mixed solvent, then ultrasonically dispersing graphite oxide and iron acetylacetonate in the mixed solvent, and obtaining ethanediamine/dispersion of the graphite oxide and the iron acetylacetonate; transferring the ethanediamine/dispersion of the graphite oxide and the iron acetylacetonate into a reactor lined with polytetrafluoroethylene for reaction and obtaining solid products; and cleaning the solid products, collecting the products with a magnet, drying and obtaining the magnetic-functionalized graphene composite material.

The invention discloses a magnetic composite material and an application thereof in regeneration and repair of bone tissues, as well as a method for preparing the magnetic composite material and a product prepared by the magnetic composite material, wherein the magnetic composite material comprises the following components: a) 10-50g of polymer material calculated by 100ml of organic solvent, wherein the polymer material is selected from polylactic acid, polyglycolic acid, lactic acid-glycolic acid copolymer, polycaprolactone, polyamide or poly-hydroxybutyric acid; b) 10g of hydroxyapatite nano-particles calculated by 100ml of the organic solvent; and c) 2.5g of gamma-Fe2O3 nano-particles calculated by 100ml of organic solvent, wherein the organic solvent is selected from tetrahydrofuran (THF), dimethylformamide (DMF), dimethylacetamide (DMAc), chloroform or dioxane.

The invention relates to magnetic composite microspheres, and a preparation method and application thereof, belonging to the technical field of chemical material preparation. The preparation method comprises the following steps: synthesizing Fe3O4@SiO2-MPS (modified polystyrene); mixing, adding acetonitrile, carrying out ultrasonic dispersion, adding isopropyl acrylamide, glycidyl methacrylate, N,N'-methylene-bis acrylamide and azodiisobutyronitrile, mixing, and carrying out oil-bath heating; distilling to obtain part of acetonitrile, and stopping the reaction; carrying out magnetic separation on the obtained, and repeatedly washing with ethanol and water; and drying in a vacuum drying oven to obtain the product. The product is used for cellulase immobilization. The synthesized magnetic composite microspheres have superparamagnetism, can enhance the enzyme activity restorability and heat stability when being used for cellulase immobilization, and implements thermal protection on the cellulase.

The invention provides a nano-medicinal carrier with magnetocaloric effect. The nano-medicinal carrier with grain diameter of 50-200 nanometers comprises mesoporous silica particles and Fe3O4 nano-particles embedded inside the mesoporous silica particles, wherein the mesoporous diameter of the mesoporous silica particles is 2-10 nanometers, and the mesoporous channel is in a radial shape from the inner core to outside; the diameter of the Fe3O4 particles is 15-20 nanometers. The invention further provides a preparation method of the nano-medicinal carrier and application of the nano-medicinal carrier in loading anti-cancer medicaments. The nano-medicinal carrier is high in drug storage capacity, and can be used for remarkably improving the anti-cancer drug high-performance transmission efficiency, remarkably improving the curative effect of tumor treatment, and realizing cancer therapy by virtue of medical chemotherapy and magnetocaloric therapy.

A process for preparing the super-paramagnetic nanoparticles dispersed in water easily includes such steps as mixing the polymer chelating agent with Fe ions, dripping alkali while reacting to generate inn oxide and continuously dripping alkali until pH=9-10.

The invention provides a detection method for fast detecting Listeria monocytogenes. According to the scheme, Fe3O4/Ru(bqy)3<2+> nanoparticles are subjected to bacterium enriching; a test strip is prepared; sample loading detection is performed. The step of eluting the Listeria monocytogenes from immunomagnetic beads is omitted, so that the capture efficiency is improved; the step of spraying Ru(bqy)3<2+> nanoparticles onto a combining pad is omitted, so that the immunological reaction is more uniform, and the variable coefficient is small during the quantitative determination; the workload and the infectious microbe contamination probability are reduced. The sensitivity of the detection scheme is very high, and the stability is high.

A method for preparing magnetic suspended coding micro-block array chips and a method for applying the preparation method, the preparation method is that firstly, selecting five same silicon sheets, and cleaning and drying the silicon sheets, secondly, coating PMMA glue, thirdly, hot padding, fourthly, utilizing an oxygen plasma body to carry out the reactive ion etching, adjusting the thickness of the glue to be 10-20 nm, fifthly, plating titanium 80-100 nm and gold 50-60 nm through vacuum evaporation, taking the titanium as a gluing and sacrificing layer, sixthly, plating nickel 10-15 nm as a gluing layer through vacuum evaporation, seventhly, plating copper 120-1250 nm through the vacuum evaporation, eighthly, evaporating nickel 30-50 nm through electronic beams, ninthly, plating gold 50-60 nm through vacuum evaporation, tenthly, stripping-off glue, and releasing suspended micro block array ships. The application method is that firstly, cleaning gold blocks, secondly, forming a monomolecular layer on the gold blocks through 11-mercapto carboxylic acid, thirdly, marking the gold blocks through biological macromolecule, fourthly, fluorescence detecting. Chips prepared by the invention have the characteristic of superparamagnetism, thereby conditions are created for biological decoration and biological magnet separation.

The invention discloses a preparation method of a composite photocatalytic material of porous nano Fe3O4-N doped with Ni/Zn-MOFs/g-C3N4. The method comprises the steps that firstly, urea is calcined to prepare a graphite-phase carbon nitride (g-C3N4) material; then, by adopting ferric chloride, sodium acetate and ethanediamine as raw materials and ethylene glycol as a solvent, a constant-temperature reaction is conducted at 180-220 DEG C for 5-7 h, centrifugal separation is conducted to form solids, and Fe3O4 nano particles with porous structures are obtained; then, zinc nitrate hexahydrate, nickel nitrate hexahydrate, the g-C3N4 material and the Fe3O4 nano particles are added to a mixed solution of N,N-dimethylformamide and ethylene glycol, and a mixed reaction solution is obtained; the mixed reaction solution is transferred to a stainless steel reaction kettle with a polytetrafluoroethylene lining, the temperature is increased to 140-160 DEG C, a constant-temperature reaction is conducted for 5-7 h, centrifugal separation is conducted to form solids, and the composite photocatalytic material of Fe3O4-N doped with Ni/Zn-MOFs/g-C3N4 is obtained. The composite photocatalytic material is of a core-shell structure, g-C3N4 is used as a core, porous nano Fe3O4-N is dispersed on a shell of Ni/Zn-MOFs doped with N, and the material has obvious photocatalytic activity.

The invention discloses a method for preparing a magnetic particle with a level hole structure, and belongs to the field of nanometer material synthesis. According to the method, resorcinol and formaldehyde are mixed and stirred to form a carbon source precursor solution; a polymeric particle of a hollow structure is added into the carbon source precursor solution to obtain a phenolic resin-polymer core-shell structure; the phenolic resin-polymer core-shell structure is dispersed into water and is immersed through concentrated sulfuric acid to obtain a particle of the core-shell structure; a saturated ferric chloride solution is added to the boiling water to be boiled, and then is cooled, and ethyl orthosilicate is added to the cooled solution; the particle of the core-shell structure is slowly dripped to the saturated ethyl orthosilicate and ferric chloride solution, and after reaction, a sandwich composite particle made of resin-polymer-magnetic materials is obtained; tetrahydrofuran is used for removing polymer in the obtained composite particle to obtain a resin, magnetic material yolk and eggshell particle; the obtained composite particle is carbonized at the high temperature to obtain a carbon, magnetic material yolk and eggshell particle. According to the method, the adopted raw materials are common chemical materials, cost is low, and the technology is simple.

The invention provides a detection method for rapidly detecting vibrio parahaemolyticus. According to the scheme, bacteria are enriched by Fe3O4/Ru(bqy) 3<2+> microspheres, a test strip is prepared, and a sample is loaded for detection. The step of eluting the vibrio parahaemolyticus from immunomagnetic beads is eliminated, so that the capturing efficiency is improved; the step of spraying the Fe3O4/Ru(bqy) 3<2+> microspheres onto a conjugate pad is eliminated, so that immunological reaction is more uniform, and a variation coefficient during quantitative detection is small; the workload and the sundry fungus contamination probability are reduced; the detection scheme is high in sensitivity and stability.

The invention provides a method for rapidly detecting staphylococcus aureus. According to the scheme, the method comprises the steps of enriching Fe3O4/Ru (bqy) 3<2+> nanoparticles with bacteria, preparing test strips, and mounting a sample for detection. By means of the method, the step of eluting staphylococcus aureus away from immunomagnetic beads is omitted, and capturing efficiency is improved; the step of spraying Ru (bqy) 3<2+> nanoparticles to a binding pad is omitted, an immunology reaction is more uniform, and the variation coefficient generated in the quantitative detection process is small; working load is reduced, and the probability of sundry bacteria contamination is lowered. The detection scheme is quite high in sensitivity and quite good in stability.

The invention provides a detection method for rapidly detecting salmonella. According to the scheme, bacteria are enriched by Fe3O4/Ru(bqy)<2+>3 microspheres, a test strip is prepared, and a sample is loaded for detection. The step of eluting the salmonella from immunomagnetic beads is eliminated, so that the capturing efficiency is improved; the step of spraying the Fe3O4/Ru(bqy)<2+>3 microspheres onto a conjugate pad is eliminated, so that immunological reaction is more uniform, and a variation coefficient during quantitative detection is small; the workload and the sundry fungus contamination probability are reduced; the detection scheme is high in sensitivity and stability.

The invention discloses a miniature magnetic capacitance sensor device based on a magnetic aggregator and a nano magnetic particle composite material. The miniature magnetic capacitance sensor deviceis composed of an SOI substrate, two magnetic field aggregators, a magnetic-nano-particle-composite-mateiral-based magnetic capacitance sensitive unit, a left metal electrode plate and a right metal electrode plate. The two magnetic field aggregators and the magnetic-nano-particle-composite-mateiral-based magnetic capacitance sensitive unit are arranged on a SiO2 surface after patterning on a toplow-resistant Si part of the SOI substrate; the two magnetic field aggregators are arranged in a left-right symmetric manner; and the magnetic-nano-particle-composite-mateiral-based magnetic capacitance sensitive unit is arranged at the gap between the two magnetic field aggregators. The magnetic nano-particle composite material is made from superparamagnetic nano particles and high-molecular polymer. The left metal electrode plate and the right metal electrode plate are spaced between the magnetic field aggregators and the magnetic-nano-particle-composite-mateiral-based magnetic capacitance sensitive unit. The miniature magnetic capacitance sensor device is suitable for magnetic field measurement on various occasions, especially for magnetic field measurement in high dynamic magnetic field application environments like the deep space, the deep sea, and the deep ground.