144results about How to "Good superparamagnetic" patented technology

The invention discloses a preparation method for core-shell structure type carbon-coated magnetic nano particles. The method comprises the following steps: preparing metal hydroxide or metal oxide nano particles having different morphologies by adopting a hydrothermal method; modifying the surfaces of the particles; coating the nano particles by adopting a similar method (described in the specification) so as to obtain phenolic resin-coated metal oxide or metal hydroxide nano composite particles; and performing calcining and carbonizing on the obtained nano composite particles to obtain the carbon-coated magnetic nano particles. The carbon-coated magnetic nano particles prepared by adopting the method disclosed by the invention are good in dispersibility, uniform in particle size and high in stability, and have graded porous core-shell structures; in the calcining process, the morphologies of the core-shell metal hydroxide or metal oxide nano particles can be kept unchanged; the particle diameters of the nano particles and the coating thickness of a carbon layer can be adjusted according to needs. The core-shell structure type composite particles prepared by adopting the method disclosed by the invention have a superpara magnetism adsorption property, and under the action of an external magnetic field, the fast separation can be realized, so that the core-shell structure type composite particles can be expected to be applied in the fields of magnetic separation and catalyzing.

The invention relates to a Fe3O4/C magnetic nano solid extracting agent coated with a novel carbon material, belonging to the field of chemical analysis and test instruments and equipment. The extracting agent simultaneously has large special surface area of nano material, short disperse path, magnetic separation capacity of magnetic material and strong adsorption capacity of carbon material, thereby being very suitable for pretreating large-scale and large-size water samples in batch. In addition, the solid extracting agent is simple to prepare, low in raw material cost, rapid and convenientto extract and friendly to the environment and only needs using a small amount of organic solvent in the whole process.

The invention relates to a preparation method of a magnetic copper ion imprinting silica gel material, which comprises the steps of: firstly preparing Fe3O4 nano particles by a hydrothermal method; then preparing magnetic nano particles Fe3O4.SiO2 with a compact silicon shell layer structure by hydrolysis reaction of tetraethoxysilane (TEOS); and finally depositing a porous Cu<2+> ion imprinting silicon gel layer by using Cu<2+> ions as template ions, a nitrogenous silylating reagent (aapts, H2NCH2CH2NHCH2CH2CH2Si(OMe)3) as a functional monomer, cetyl crimethyl ammonium bromide (CTAB) as a porogenic agent, and TEOS as a cross-linking agent on the surface of Fe3O4.SiO2. The agnetic copper ion imprinting silica gel material obtained by the method provided by the invention can enrich Cu<2+> ions quickly and selectively, and has excellent regenerability and acid resistance.

The invention relates to a preparation method of amino modified Fe3O4@SiO2@mSiO2 composite particles with a mesoporous structure. The preparation method comprises the steps: dispersing Fe3O4@SiO2 powder into a mixture solution of ethanol, deionized water, ammonia water and a template agent, so as to obtain a sol solution; then, dropwise adding TEOS into the sol solution, so as to prepare Fe3O4@SiO2@mSiO2 composite particles with the mesoporous structure; drying the Fe3O4@SiO2@mSiO2 composite particles, then, adding ethylene glycol into the dried Fe3O4@SiO2@mSiO2 composite particles, carrying out ultrasonic separation, then, adding a silane reagent, carrying out high-temperature refluxing while carrying out stirring so as to enable the silane reagent to be adsorbed into mesoporous pore passages of SiO2, carrying out a hydrolytic reaction, removing unreacted silane reagent or the silane reagent which is not adsorbed into the mesoporous pore passages, and finally, carrying out vacuum drying, thereby obtaining the amino modified Fe3O4@SiO2@mSiO2. According to the preparation method, SiO2 with a mesoporous structure serves as a shell layer, a nanoparticle Fe3O4 serves as a magnetic core, the stability in an acidic solution system is excellent, the difficult problem of the ordinary adsorbents that the separation is difficult after adsorption can be solved, the efficiency of adsorbing a target product is increased, and the reuse rate of an adsorbent is increased, so that the preparation method has good economic and environmental benefits.

The invention relates to a preparation and application of a new macromolecule lipidosome. The structure is a vesicle which has a lipide dual-layer structure containing duoparental chitosan longchain alkyl quaternary ammonium salt as well as phospholipid with micromolecule. The chitosan longchain alkyl quaternary ammonium salt is characterized in that: the weight average molar mass is bigger than 2000; the chitosan longchain alkyl quaternary ammonium salt can be dissolved in chloroform and other organic solvent, which contains carboxyl, amino or quaternary ammonium salt radical and concretely is one of the duoparental chitosan longchain alkyl quaternary ammonium salt disclosed by 200710056993.4 of China Invention Patent. The surface of the macromolecule lipidosome can be connected with various Liver-Targeted preparations. The macromolecule lipidosome can carry water-soluble, oil-dissolving or duoparental materials including medicine, protein, gene, nutrition, vitamin, magnetic granule and quantum dot, etc. The macromolecule lipidosome has the advantages of high wrapping rate, simple and convenient operation, strong applicability and low cost; the macromolecule lipidosome after being covered has even distributed granule diameter which can be lower than 20nm for the smallest, has stable system and strong functions for carrying medical tiny balls and slowly controlling as well as releasing.

The invention belongs to the field of chemical analysis test instruments, and relates to a Fe3O4 magnetic nanometer solid-phase extractant which is coated by alginic acid polymers and modified by C18 silane. The extractant has the magnetic separation ability of the magnetic material, strong extraction ability of the C18 and good hydrophilic property, an ion channel and size extrusion functions of the alginic acid polymer, so that the extractant is quite suitable for the large-scale batch pre-treatment of water sample with large volume. The pollutants of alkyl phenol, phthalate ester, polycyclic aromatic hydrocarbon, full fluorine, and the like are taken as representatives of common pollutants in the water sample. For 500mL of environmental water sample, 0.1g of the extractant is used, and the efficiency of extracting the organic pollutants all reaches more than 85 percent.

The invention discloses a method for preparing a ferroplatinum nano-particle. The method belongs to a high-temperature liquid phase reduction method. The method comprises the following steps: a dendritic polymer which takes a benzene ring as a core is taken as a template, and polyhydric alcohol is taken as an organic agent and a reducer so that an organic iron compound and an organic platinic compound are dissolved in the polyhydric alcohol solution of the template for gradient heating and multi-stage reaction to prepare the fcc-phase ferroplatinum nano-particle with 4-10nm average particle size, good dispersibility and better superparamagnetism. The method is simple and has the advantages of available raw materials, low cost, mild condition, low equipment requirement, environmental-friendly production process, pollution-free byproducts and large-scale industrialized production.

The invention discloses a method for preparing superparamagnetic iron oxide nanometer particles modified by polyvinylpyrrolidone. The method sequentially comprises the following steps that: 1) under the protection of inert gas, FeCl3.6H2O, FeCl2.4H2O and polyvinylpyrrolidone are dissolved in diglycol at the room temperature; 2) under the protection of inert gas, mixed solution of NaOH and diglycol is added to obtained tawny solution for reaction; 3) an obtained black suspension is cooled to room temperature and added with ethyl acetate for centrifugation; 4) solids obtained after centrifugation are dispersed in anhydrous ethanol, and then ethyl acetate is added for centrifugation; 5) the steps 4) is repeated twice to three times and black solids are obtained; and 6) the black solids are dispersed in deionized water, placed in a dialysis bag with the molecular weight cutoff between 10 and 15 w and dialyzed for at least 48 hours. The superparamagnetic iron oxide nanometer particles modified by polyvinylpyrrolidone are used for tracing the functions of islet graft.

The invention discloses a preparation method for a magnetic carbon nanotube demulsifier. The preparation method comprises the following steps: (1) subjecting carbon nanotubes and mixed acid to a refluxing reaction, so as to obtain oxidation modified carbon nanotubes; (2) preparing a Fe3O4 precursor solution; and (3) uniformly mixing the oxidation modified carbon nanotubes with the Fe3O4 precursorsolution, and carrying out a reaction at a temperature of 180 DEG C to 220 DEG C, thereby preparing the magnetic carbon nanotube demulsifier. According to the preparation method provided by the invention, firstly, the carbon nanotubes are subjected to oxidation modification through the mixed acid to introduce a large number of carboxyl groups and hydroxyl groups to defects and edges of the carbonnanotubes, and then, Fe3O4 nanoparticles are prepared in situ by utilizing a hydrothermal method to modify the oxidation modified carbon nanotubes; the preparation method is simple and is easy to implement; and the prepared magnetic carbon nanotube demulsifier can be used for rapidly achieving oil-water separation of oily wastewater and is relatively good in demulsification effect. A technical scheme of the invention further provides an application of the magnetic carbon nanotube demulsifier in the oily wastewater.

The invention discloses a method for preparing a water-soluble ferroferric oxide nano particle, relates to a nano particle, and provides the ferroferric oxide nano particle which has the grain diameter of less than 4 nm and narrow particle diameter distribution. The method for preparing the water-soluble ferroferric oxide nano particle of a typical monodisperse particle is provided. The method comprises the steps as follows: 1), anhydrous ferric chloride and trisodium citrate are immersed in diethylene glycol and heated until the anhydrous ferric chloride and the trisodium citrate are dissolved completely; 2), anhydrous sodium acetate is added into a mixed solution obtained in the step 1), and the mixed solution is waited to be dissolved completely; 3), the mixed solution obtained in the step 2) is placed into a reaction still, the reaction still is closed, and after the reaction, the mixed solution is naturally cooled to the room temperature; and 4), the ferroferric oxide nano particle is separated from the reaction solution prepared in the step 3) by a magnet, the particle is washed and dried, so that the monodisperse water-soluble ferroferric oxide nano particle is obtained.

The invention relates to a method for utilizing excimer laser irradiation to prepare magnetic functional textile, which comprises: adopting a coprecipitation method to prepare nanometer ferroferric oxide granules, then, using oleic acid to modify the surface of the nanometer ferroferric oxide granules, then, dipping polyester fabrics in ethanol solution which contains the nanometer ferroferric oxide granules whose surface is modified by the oleic acid, lastly, utilizing excimer laser irradiation 222nm to irradiate two surfaces of the polyester fabrics after dipping, and finally obtaining the magnetic functional textile with comparatively high fastness to washing. The magnetic functional textile which is prepared by the method has good washability, the method of the invention is simple and novel and has simple technique, few equipment, small strength damage to the polyester fabrics, low energy consumption, convenient extension and the like.

The invention provides a magnetic nano mixed semi micelle and a preparation method thereof as well as an application of the magnetic nano mixed semi micelle in adsorbing and separating a cationic dye from an environmental water sample. The magnetic nano mixed semi micelle consists of a carrier and a surface micelle layer, wherein the carrier is magnetic nano particles, the surface of the carrier is a mixed semi micelle formed by an anionic surface active agent; the magnetic nano particles are Fe3O4 or gamma-Fe2O3; and the anionic surface active agent is sodium dodecyl sulfate, sodium dodecylbenzene sulfonate or sodium n-alkyl benzene sulfonate. The magnetic nano mixed semi micelle prepared by the method provided by the invention not only has the advantages of large specific area and high adsorption capacity of a nano material, but also has good magnetic separating power of a magnetic material; when the magnetic nano mixed semi micelle is applied to solid phase extraction, the adsorption time can be greatly shortened; and the preparation method of the adsorbent is simple, low in cost and very suitable for large-scale batch processing of the environmental water sample.

The invention discloses a synthesizing method of dielectric hole ferric oxide, which comprises the following steps: adopting dielectric carbon as hard mould; stirring; leaching; dissolving ferric salt into pore path of dielectric carbon; disposing through sodium hydroxide; sintering protected by nitrogen; repeating the stirring and leaching course; sintering in the air; obtaining the product.

The invention discloses a Fe3O4 grafted copolymer heterozygote with multiple stimulus responses, and a preparation method and an application thereof. The heterozygote provided by the invention is composed of magnet-responsive Fe3O4, pH-sensitive polyacrylic acid, and redox-sensitive polymethacrylate ferrocenylformyloxyethyl ester. The preparation method comprises the following preparation process:introducing a Fe3O4 surface chain transfer agent, and grafting polyacrylic acid and polymethacrylate ferrocenylformyloxyethyl ester onto the surface of Fe3O4 through two continuous steps of reversible addition-fragmentation chain transfer polymerization so as to obtain a Fe3O4 grafted acrylic acid-methacrylate ferrocenylformyloxyethyl ester segmented copolymer heterozygote. The heterozygote provided by the invention can be self-assembled into a spherical core-shell micelle in water, shows stimulus responsiveness to magnet, pH and redox, has the characteristic of releasing multiple stimulus responses to an anti-cancer drug namely paclitaxel, and can be used as a carrier of a hydrophobic drug and applied to targeted therapy of cancer.

The invention discloses a preparation method of CD133 immunomagnetic beads. The preparation method comprises the following steps: preparing magnetic beads; preparing magnetic chitosan microspheres; weighing 10 g of chitosan, and adding the weighed chitosan into 200 ml of a 2% acetic acid solution for overnight soaking to enable dissolution; adding 1 g of Fe2O4 nano magnetic beads into the mixed solution, and performing stirring at the room temperature under the condition of 300 r/min; adding 200 ml of saxoline, and performing stirring at 40 DEG C under the condition of 300 r/min; raising the temperature to 50 DEG C, adding 40 ml of formaldehyde, and performing stirring under the condition of 300 r/min; adding 20 ml of glutaraldehyde with the volume concentration of 50% into the mixed solution, performing stirring at 60 DEG C under the condition of 170 r/min, adjusting the pH to be 10, and performing stirring for 2-6 h; adding 100 ml of petroleum ether into a reaction system after finish of reaction, fully performing stirring, performing suction filtration by use of a Buchner funnel to obtain magnetic chitosan microsphere particles, then fully performing stirring and washing by use of ethyl alcohol, washing with distilled water after removal of ethyl alcohol, and performing vacuum drying at 50 DEG C; performing carboxylation on the magnetic chitosan microspheres; and coupling immunomagnetic beads subjected to carboxylation with an anti-body. The preparation method has the advantages of good stability, high sensitivity and the like.

The invention discloses a preparation method of a magnetic nanometer water treatment agent for oil field sewage. The preparation method includes firstly, soaking magnetic nanometer particles of Fe3O4 with water while regulating pH to 5-7 and then carrying out ultrasonic dispersion to obtain an aqueous solution containing magnetic nanometer particles of Fe3O4; stirring the aqueous solution containing magnetic nanometer particles of Fe3O4 in a container, placing the container in constant-temperature water bath for holding temperature, gradually dropwise adding sodium oleate solution, after that, continuing to stir for 20 to 40 minutes, and cooling the solution to the temperature of 45 to 55 DEG C to obtain a mixture; finally, adding block polyether modifier solution in the mixture while stirring at the temperature of 45-55 DEG C for 0.5 to 2 hours so as to obtain the magnetic nanometer water treatment agent. The water treatment agent has the advantages such as flocculation, demulsification and easiness in magnetic separation. The water treatment agent can be recovered so that consumption of the water treatment agent is lowered and water treatment cost is reduced.

The invention relates to the technical field of water pollution control, in particular to a sewage treatment preparation and a preparation method thereof. The sewage treatment preparation is of a coreshell structure formed by using sodium oleate modified ferroferric oxides as a core and compounding a beta-cyclodextrin layer on the outer periphery of the core. Ferroferric oxides are of porous reticular structures; the pores of the ferroferric oxides is filled with modified charcoal. Ferroferric oxides in the sewage treatment preparation obtained through preparation have natural porous reticular structures of loofah; the modified charcoal can be filled, so that the large specific surface area is realized; the adsorption capability is further improved; high adsorption performance is shown; the sewage treatment preparation can be widely applied to purification treatment of industrial wastewater, domestic sewage and underground water.

The invention discloses a preparation method and application of catalytic material based on magnetic layered double hydroxides, and belongs to the technical field of catalysts. The preparation methodmainly comprises the following steps of: preparing magnetic layered double hydroxides by using magnetic silica gel particles as a core, and reacting the magnetic layered double hydroxides with silvernitrate to obtain a magnetic nano-silver catalyst. The prepared magnetic nano-silver catalyst has the characteristics of the large loading capacity, the high activity, the high catalytic efficiency and the stable structure, the prepared magnetic nano-silver catalyst can be quickly separated from mother liquor, is simple and convenient, and can be repeatedly used, and after the silver catalyst is repeatedly used for 10 times, the degradation rate of a target object is still 95% or above.

A process for preparing the superfine ultra-paramagnetic contrast medium for magnetic resonance includes such steps as dropping the ammonia solution into the mixed solution of Fe salt, ferrous salt and polyose at 4-7 deg.C under N2 protection to make pH=9.5-10 while stirring, raising its temp to 60-90 deg.C, holding the temp for 50-70 min while stirring, cooling, adding diluted hydrochloric acid to make pH=7.4-7.6, adding PBS, filtering, adding solution of glucose, and storing at 4-15 deg.C.