31 results about "Superparamagnetic iron oxide nanoparticles" patented technology

The invention discloses a high-toughness grouting material and a preparation method thereof, and belongs to the technical field of building materials. The photochromic thermal insulation material is prepared from the following raw materials in percentage by mass: 30 to 36 percent of sulphoaluminate cement, 28 to 32 percent of quartz sand, 0.4 to 0.9 percent of nano graphene / carbon tube hybrid, 12 to 15 percent of superfine composite admixture, 1.0 to 1.8 percent of temperature-sensitive shape memory alloy fiber, 1.5 to 2.0 percent of microbial self-repairing capsule, 15 to 18 percent of photochromic epoxy hybrid emulsion, 0.2 to 0.35 percent of polycarboxylate superplasticizer and 0.8 to 1.2 percent of magnetic iron oxide coated SiO2 expanding agent. According to the invention, the active inhibition that the crack width is less than or equal to 0.05 mm is realized through the shrinkage compensation of the magnetic field oriented expanding agent, the temperature-sensitive fiber phase change toughening and the photochromism-microorganism synergistic repair.

The invention relates to a striker type micro-nano robot for cell membrane breakthrough and a preparation process of the striker type micro-nano robot, in particular to a striker type micro-nano robot driving control method based on a photomagnetic coupling field and a rotary blasting type cell membrane breakthrough method. The invention discloses a striker type micro-nano robot for cell membrane breakthrough. The striker type micro-nano robot consists of a magnetic iron oxide core and a silicon dioxide needle handle, wherein the surface of one side of the magnetic iron oxide core is coated with a gold layer. The invention discloses a preparation process of a firing pin type micro-nano robot. The preparation process of the firing pin type micro-nano robot comprises the steps of sol-gel core preparation, magnetron sputtering and chemical precipitation needle handle preparation. Under the cooperative driving of an external magnetic field and a near-infrared light field, rotary blasting type breakthrough can be performed on a mononuclear membrane through the tip end of the needle handle.

The invention discloses a steel coil high-temperature annealing sealing sand magnetic separation recycling method which comprises the following steps: caked sealing sand is coarsely crushed, uncaked raw sand grains and caked mixed materials are screened and separated, and the caked mixed materials comprise undissociated raw sand grains, glass phase coating bodies and sintered aggregates; microwave heating and liquid nitrogen cooling are combined to treat the caked mixture, so that a glass phase coating body is subjected to targeted fracture, and loose particles and undissociated blocks are separated through airflow separation; the loose particles directly adsorb free iron oxide through first-stage magnetic separation, and then enter second-stage magnetic separation, and weak magnetic iron oxide is separated through combination of dynamic fluidization separation and magnetofluid enhancement; the undissociated blocks are subjected to acid pickling dissociation, and a glass phase and undamaged raw sand grains are separated through electric field separation; and surface melting and cooling forming are conducted on the loose particles and undamaged original sand grains, and the roundness of the sand grains is recovered. Efficient purification and cyclic utilization of the sealing sand are achieved, and the magnetic separation efficiency and the sand grain quality are remarkably improved.

The invention discloses a sandwich structure catalyst for preparing adipic acid through cyclohexene oxidation based on a metal organic framework material, and belongs to the technical field of chemical synthesis, the structure of the catalyst is as follows: magnetic iron oxide nanospheres are loaded with heteropolyacid nanodots, and the outer layer is coated with a porous metal organic framework shell. The catalyst has excellent magnetic recovery performance, large specific surface area and open pore channels, and has the advantages of high catalytic activity, easy recovery, stable structure and the like. The excellent performance shows that the sandwich structure catalyst has important application value in reactions for preparing adipic acid through cyclohexene oxidation and the like.

The invention discloses a visual efficient chloride ion removal adsorbing material and a preparation method and application thereof.The adsorbing material is prepared by the steps that hollow glass microspheres serve as a carrier, and hollow glass porous particles are synthesized from a mixture of hollow glass microsphere powder and a pore forming agent through a sol-gel method; the preparation method comprises the following steps: modifying the surface of a porous adsorption material through a low-temperature plasma bombardment technology to enhance the adsorption performance on chloride ions, and loading magnetic iron oxide nanoparticles on the porous adsorption material to prepare the chloride ion adsorption material; the adsorption material has the characteristic of environmental friendliness, not only can efficiently adsorb chloride ions in a water body, but also can realize the visualization of the adsorption process through the density difference before and after adsorption, has the characteristics of repeated use and easiness in regeneration, and has relatively high market application prospect and economic value.

This invention relates to magnetic iron oxide nanoparticle-based sensors and biosensors. This invention also relates to sensing methods utilizing magnetic iron oxide nanoparticle-based sensors. This invention also relates to biosensing methods utilizing magnetic iron oxide nanoparticle-based biosensors. A key approach is to utilize magnetic iron oxide nanoparticles (spherical shape) with appropriate particle size and magnetic properties (superparamagnetic and ferrimagnetic properties) to enhance the efficiency, sensitivity, and selectivity of magnetic nanoparticle-based sensors and biosensors by selecting nanoparticles with suitable particle size and crystallite size. Another key approach is to utilize magnetic iron oxide nanoparticles (cuboid shape) with appropriate particle size and ferrimagnetic properties to enhance the efficiency, sensitivity, and selectivity of magnetic nanoparticle-based sensors and biosensors by selecting nanoparticles with suitable particle size.

The application discloses a kind of multistage size response type iron-based nano preparation and its preparation method and application, the iron-based nano preparation includes responsive iron-based nanomaterial and the protein drug of load, the responsive iron-based nanomaterial is by magnetic iron oxide nanoparticles surface complex dopamine and dopamine phenylboronic acid ligand, the molar ratio of two ligands is 1:0.52~2.57;Preparation method: magnetic iron oxide nanoparticles is dispersed in solvent, dopamine hydrochloride and dopamine phenylboronic acid are added, and under the condition of 40~80 DEG C reaction, obtain responsive iron-based nanomaterial;Protein drug is mixed with the responsive iron-based nanomaterial obtained in aqueous solvent, and evenly dispersed to obtain target nano preparation.The multistage size response type iron-based nano preparation of the application realizes microenvironment response delivery, deep penetration, lysosome enrichment, efficient iron death trigger and the cascade synergistic effect of immune activation, provides a kind of safe and efficient new strategy for tumor synergistic treatment.

The invention discloses ultra-small magnetic iron oxide nanoparticles taking small molecules as a stabilizer as well as a preparation method and application of the ultra-small magnetic iron oxide nanoparticles, and belongs to the technical field of nano materials. The magnetic iron oxide nanoparticles provided by the invention comprise magnetic iron oxide particles and hydrophilic small molecules connected to the surfaces of the magnetic iron oxide particles, the average molecular weight of the hydrophilic small molecules is less than 1000 Daltons. Hydrophilic small molecules are connected to the surfaces of the magnetic iron oxide particles, good stabilizing and dispersing effects can be achieved, and compared with existing magnetic iron oxide nanoparticles with macromolecules as a stabilizer, the magnetic iron oxide nanoparticles are lower in viscosity, higher in biocompatibility, higher in longitudinal relaxation r1 value and better in stability. The clinical practicability and the development prospect are better, and the preparation of a safe and reliable MRI contrast agent, especially a T1 weighted contrast agent, is facilitated.

The invention belongs to the technical field of nano materials, and particularly discloses a carbon-based sheet-shaped magnetic nanoparticle aggregate synthesis method. The method comprises the following steps: preparing graphene by utilizing chemical vapor deposition and transferring the graphene to a target substrate; synthesizing an iron oleate precursor, and preparing magnetic iron oxide nanoparticles with different morphologies; performing surface modification on the magnetic iron oxide nanoparticles by using sodium citrate; and mixing the modified magnetic iron oxide nanoparticles with graphene, and adjusting the mixing time and the particle size to obtain the two-dimensional flexible magnetic aggregate. According to the scheme, the technical problems that an existing synthesis method is poor in dispersity, unstable in magnetic strength and sensitive to environmental factors are solved.

A method for preparing magnetic iron oxide by pyrolysis of iron mud waste from a biological iron and manganese removal water plant belongs to the technical field of solid waste treatment and resource utilization, and includes steps such as iron mud sedimentation, air drying, pyrolysis, water washing separation, and drying. The present invention uses high-temperature pyrolysis to recover iron from iron mud and prepare magnetic iron oxide (γ-Fe2O3), which has the advantages of high magnetism, high yield, simple steps, and low production cost. It makes full use of waste iron mud to achieve the resource utilization of iron mud. This material has the potential to be used as a magnetic material in various water treatment processes such as adsorption, coagulation, and advanced oxidation.

This invention relates to magnetic iron oxide nanoparticles (NPs), and to methods of making the magnetic iron oxide nanoparticles (NPs) with tunable particle sizes and crystallite size. More specifically, this invention provides methods for making highly crystalline iron oxide nanospheres (IONSs) that exhibit enhanced ferrimagnetic (FM) properties. In addition, the method allows precise modulation of the nanoparticle crystallinity, which in turn enables the ability to finely tune their magnetic properties from ferrimagnetic (FM) properties to superparamagnetic (SPM) properties.

The present invention discloses a method for preparing a spin-type polyacrylic acid magnetic mesoporous carrier for nucleic acid extraction. The preparation method comprises the following steps: preparing a spin-type magnetic iron oxide nanorod-shaped carrier core, coating mesoporous silica on the spin-type magnetic iron oxide nanorod-shaped carrier core, performing amino modification on the spin-type magnetic iron oxide nanorod-shaped carrier core, and finally modifying the spin-type magnetic polyacrylic acid mesoporous carrier with an acrylic acid modification layer to obtain a spin-type magnetic polyacrylic acid mesoporous carrier. The present invention achieves the improvement of nucleic acid adsorption sites and the improvement of mass transfer rate during nucleic acid adsorption through the synergistic effect of the spin-type magnetic iron oxide nanorod-shaped carrier core, the mesoporous silica structure layer and the polyacrylic acid modification layer, thereby ultimately improving the efficiency of nucleic acid extraction.

The present disclosure provides a method for separating iron element in brine and application thereof. The method for separating iron element in brine comprises: adding a pH adjusting agent to brine, to adjust pH of the brine to 6.0-7.0, and controlling the temperature of the brine to 75° C.-90° C.; introducing an oxygen-containing gas into the brine, to covert the iron element in the brine into magnetic iron oxide; and separating the magnetic iron oxide from the brine by magnetic adsorption to obtain an iron-removed brine.

The invention relates to the technical field of soil remediation, and particularly discloses a composite biochar material for adsorbing heavy metals in soil and a preparation method. The composite biochar material comprises 30-60 parts of cocoanut active charcoal, 10-15 parts of nano-hydroxyapatite, 5-10 parts of magnetic iron oxide / porous ceramic particles, 10-15 parts of shell powder and 5-10 parts of sea sludge. The preparation method comprises the following steps: uniformly mixing the raw materials, granulating and drying to obtain mixture particles; placing the mixture particles in an inert gas atmosphere, heating the mixture particles to 350-750 DEG C, carrying out heat preservation calcination for 1.5-3 hours, and naturally cooling the mixture particles to room temperature to obtain carbonized particles; and washing, drying and sieving to obtain the composite biochar material. By adopting the coconut shell activated carbon, the nano-hydroxyapatite, the magnetic iron oxide / porous ceramic particles, the shell powder and the sea sludge in a specific proportion, the adsorption efficiency of the biochar material on heavy metals can be improved.

The invention relates to the technical field of printing materials, in particular to high-stability carbon powder as well as a preparation method and application thereof. The carbon powder comprises the following components in parts by mass: 60-70 parts of modified styrene-acrylic resin, 10-12 parts of carbon black, 5-6 parts of a charge control agent, 5-6 parts of a silane coupling agent, 18-22 parts of magnetic iron oxide, 2-4 parts of a lubricant and 2-4 parts of a plasticizer, the carbon powder disclosed by the invention is good in stability under high-temperature and high-humidity storage conditions, the problems of caking, charge attenuation and image blurring are effectively prevented, and the carbon powder also has a relatively wide melting point range, so that the continuity of printing operation and the consistency of output quality are ensured.

Disclosed is a multi-functional nanoparticle delivery system comprising a biodegradable core of poly(lactic-co-glycolic acid) (PLGA) or calcium phosphate (CaP), encapsulating a nicotinamide adenine dinucleotide (NAD+) precursor and a sirtuin activator. Surrounding the core is a liposomal or polymeric layer containing one or more senolytic agents, and an outer layer of magnetic iron oxide nanoparticles for targeted delivery, external manipulation, and imaging. In some embodiments, the nanoparticle surface is functionalized for conjugation with autologous mesenchymal stem cells to enhance homing and regenerative potential. The system is pH-responsive, releasing its payload in acidic microenvironments typical of senescent or diseased cells, while remaining stable at physiological pH. This integrated design supports NAD+ restoration, sirtuin activation, senescent cell clearance, and tissue regeneration. Applications include treatment of age-related diseases, regenerative medicine, cardiovascular and neurodegenerative disorders, and cosmetic skin rejuvenation.

The present invention discloses a magnetic ferroferric oxide nanoparticle, and a preparation method therefor and the use thereof. The magnetic ferroferric oxide nanoparticle contains ferroferric oxide and a hydrophilic macromolecule, wherein the ferroferric oxide and the hydrophilic macromolecule are in at least one of the following relationships (1) and (2): (1) the hydrophilic macromolecule is adsorbed on the surface of the ferroferric oxide; and (2) the ferroferric oxide and the hydrophilic macromolecule are in the state of mutual embedding or occlusion. In the present invention, the hydrophilic macromolecule is used as a stabilizer, and ferrous ions and ferric ions form the magnetic ferroferric oxide nanoparticle by means of coprecipitation; and the magnetic ferroferric oxide nanoparticle has a relatively high longitudinal magnetic relaxation rate r1, a relatively low transverse / longitudinal magnetic relaxation rate ratio (r2 / r1), good water solubility, high stability, and good biocompatibility, and can be used as a contrast agent for T1-weighted magnetic resonance imaging (MRI) to improve the contrast and sensitivity of MRI.

This invention relates to magnetic iron oxide nanoparticles (NPs), and to methods of making the magnetic iron oxide nanoparticles (NPs) with tunable particle sizes and crystallite size. More specifically, this invention provides methods for making highly crystalline iron oxide nanospheres (IONSs) that exhibit enhanced ferrimagnetic (FM) properties. In addition, the method allows precise modulation of the nanoparticle crystallinity, which in turn enables the ability to finely tune their magnetic properties from ferrimagnetic (FM) properties to superparamagnetic (SPM) properties.

The invention discloses a method for preparing cryptand-modified magnetic iron oxide nanoparticles, comprising the following steps: S1, preparing magnetic iron oxide nanoparticles; S2, preparing a cryptand compound with an R group, wherein the cryptand compound has a structure shown in Formula I; S3, dissolving the cryptand compound in tetrahydrofuran, adding magnetic iron oxide nanoparticles, copper iodide, N-ethyldiisopropylamine and sodium ascorbate, heating reaction under nitrogen protection, collecting the product after the reaction, washing and drying, and obtaining cryptand-modified iron oxide nanoparticles. The invention synthesizes cryptand-modified magnetic iron oxide nanoparticles by chemical reaction the prepared magnetic iron oxide nanoparticles and the cryptand compound, and has the beneficial effect of a simple synthesis method; the invention also discloses a cryptand-modified magnetic iron oxide nanoparticle, which has excellent adsorption and removal effect on Pb and Cd ions in rice soaking liquid.

The present invention discloses a method for magnetic separation and recycling of sealed sand in high-temperature annealing of steel coils, comprising: coarsely crushing the agglomerated sealed sand, screening and separating the unagglomerated original sand grains and the agglomerated mixture, where the agglomerated mixture includes: undissociated original sand grains, glass phase coatings, and sintered agglomerates; treating the agglomerated mixture by combining microwave heating and liquid nitrogen cooling to targetedly break the glass phase coatings, and then separating loose particles and undissociated blocks by air classification; the loose particles are first directly adsorbed with free iron oxide by primary magnetic separation, and then enter secondary magnetic separation to separate weakly magnetic iron oxide through combined dynamic fluidized classification and magnetic fluid enhanced separation; the undissociated blocks are acid-washed and dissociated, and the glass phase and undamaged original sand grains are separated by electric field classification; the surface of the loose particles and the undamaged original sand grains is melted and cooled to form, restoring the roundness of the sand grains. The present invention realizes the efficient purification and recycling of the sealed sand, significantly improving the magnetic separation efficiency and the quality of the sand grains.

The invention relates to the technical field of recycling and harmlessness of solid waste residues in the aluminum industry, and discloses a method for recycling the solid waste residues in the aluminum industry, which comprises the following steps: mixing red mud in the solid waste residues in the aluminum industry with cathode carbon, and reducing weakly magnetic iron oxide in the red mud into ferromagnetic elemental iron under roasting treatment by taking the cathode carbon as a reducing agent; iron powder is comprehensively utilized after magnetic separation, and alkaline solid waste residues serve as a flue gas purifying agent. In the high-temperature roasting process, the cathode carbon block in the overhaul slag is used as a reducing agent and is subjected to a reduction reaction with Fe2O3 in the red mud, the Fe2O3 is reduced into ferromagnetic elemental iron Fe, and separation and treatment are easy. Meanwhile, harmful substances such as cyanide and fluoride in the overhaul slag are decomposed at high temperature. Therefore, the red mud and the overhaul slag cathode carbon block are co-treated, so that harmless, reduction and resourceful treatment is realized.

To provide an electromagnetic wave absorber capable of effectively absorbing a plurality of types of electromagnetic waves with different frequencies in a high frequency band equal to or higher than the millimeter wave band.SOLUTION: In an electromagnetic wave absorber in which an electromagnetic wave absorbing layer is formed by stacking multiple magnetic layers containing a magnetic iron oxide that magnetically resonates at high frequencies equal to or higher than the millimeter wave band, the magnetic layers include a particulate magnetic iron oxide and a resin binder, the difference in absolute impedance between two adjacent layers of the multiple stacked magnetic layers is 350 Ω or less, and the input impedance of the magnetic layers is matched to the input impedance of the other adjacent magnetic layers.SELECTED DRAWING: Figure 1

The invention relates to the technical field of nondestructive testing, in particular to magnetic-fluorescent difunctional nanoparticles as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: dissolving ferric chloride hexahydrate and sodium salt in ethylene glycol, adding an amine compound and an emulsifier, uniformly mixing, heating for reaction, and cleaning and drying after the reaction is finished to obtain amino-modified magnetic iron oxide nanoparticles; the preparation method comprises the following steps: dispersing magnetic iron oxide nanoparticles in absolute ethyl alcohol, adding a polymer monomer, stirring, carrying out heating reaction, and carrying out magnetic separation, cleaning and drying after the reaction is ended, so as to obtain aminated magnetic iron oxide nanoparticles with an intermediate layer; dispersing the prepared nano-particles in absolute ethyl alcohol, adding a rare earth compound, a rare earth fluorescent complex and an amine compound, performing stirring reaction at room temperature, performing magnetic separation, cleaning and drying after the reaction, and performing post-treatment on the nano-particles to obtain the magnetic-fluorescent dual-function nano-particles.

The invention belongs to the technical field of raw material conveying, and discloses a feeding mechanism based on magnetic iron oxide black production, which comprises a base, a material collecting device fixedly mounted at the top of the base, and a recoverable feeding mechanism comprising a collecting mechanism movably clamped in the material collecting device. The top of the material collecting device is fixedly connected with a feeding device, and the top of the material collecting device is fixedly provided with an active feeding device. A moving block moves towards the feeding device on a rail, so that a spherical shell can push a push plate to move through a connecting rod and a fixed block, torsion springs installed on the connecting rod and the moving block can help the push plate to be close to the inner wall of a hopper all the time, scrap iron raw materials are fully pushed at a constant speed, and the problems that when the hopper is flatly laid, feeding is not uniform, and the feeding efficiency is high are solved. And therefore, fine scraps are accumulated on the two sides of the conveying crawler belt, and equipment is easy to damage.

This invention relates to magnetic iron oxide nanoparticles (NPs), and to methods of making the magnetic iron oxide nanoparticles (NPs) with tunable particle sizes and crystallite size. More specifically, this invention provides methods for making highly crystalline iron oxide nanospheres (IONSs) that exhibit enhanced ferrimagnetic (FM) properties. In addition, the method allows precise modulation of the nanoparticle crystallinity, which in turn enables the ability to finely tune their magnetic properties from ferrimagnetic (FM) properties to superparamagnetic (SPM) properties.

The invention discloses a preparation method of PEG-DA modified magnetic iron oxide nanoparticles. The preparation method comprises the following steps: synthesis of small-size Fe2O3 nanoparticles: synthesizing the Fe2O3 nanoparticles by adopting a thermal decomposition method; and modifying the Fe2O3 nanoparticles with PEG-DA (Polyethylene Glycol The Fe2O3 nano-particles synthesized by adopting a thermal decomposition method are easy to control in shape and size, high in crystallinity, high in size controllability and smaller in aggregation trend, and the method is more advanced in synthesis of the iron oxide nano-particles with higher performance. PEG-DA (polyethylene glycol-dopamine) is adopted to modify the Fe2O3 nano-particles, so that the hydrophilicity can be increased, the biocompatibility can be improved, and the obtained Fe2O3-coated PEG-DA nano-particles are good in stability and good in T1 performance.

The invention discloses a neutral magnetic bioactive glass and its preparation method and application, wherein the neutral magnetic bioactive glass is obtained by low-temperature calcining a nanoparticle silicon-based porous material loaded with calcium sulfate, magnesium oxide and ferroferric oxide; the preparation method of the nanoparticle silicon-based porous material loaded with calcium sulfate, magnesium oxide and ferroferric oxide is as follows: a calcium ion solution is added dropwise to a sodium silicate transparent colloid for coprecipitation reaction to obtain a white colloid; magnesium oxide and ferroferric oxide are added, sulfuric acid solution is added dropwise to neutrality and stirred, and after filtration, the ferroferric oxide is aged for 24 to 48 hours under the condition of 60 to 80 ° C; after the low-temperature calcination, the ferroferric oxide is oxidized to magnetic γ-iron oxide. The process is simple, the cost is low, and the calcination temperature is not higher than 450 ° C, so that the surface has a microporous structure, the specific surface area is larger, it is more conducive to the mineralization of the material, the biological activity of the material is improved, and no α-iron oxide is produced, and the magnetocaloric performance is better.

The present invention provides the preparation and application of a functionalized magnetic material that enhances the adsorption of microplastics in water. The magnetic material uses polyethylene glycol to modify the surface of magnetic ferroferric oxide to form a hydroxylated magnetic iron oxide nanomaterial. This material has the characteristics of a large specific surface area and a large number of adsorption active sites. It also possesses magnetic properties, making it easy to recycle. The present invention uses surface hydroxylated ferroferric oxide as an adsorbent for the removal of polyethylene microplastics from water. Results show that the hydroxylated adsorbent can efficiently remove polyethylene microplastics from water in a short period of time. Compared with nano-iron oxide without surface modification, the adsorption rate for polyethylene is increased by 54%. This invention verifies that surface functionalization can increase the adsorption rate of ferroferric oxide for polyethylene, and has broad application prospects in the treatment of microplastic pollution in water.

The application discloses a preparation method of PEG-DA modified magnetic iron oxide nanoparticles, and comprises the following steps: synthesizing small-size Fe2O3 nanoparticles by adopting a thermal decomposition method; and modifying the Fe2O3 nanoparticles by PEG-DA. The Fe2O3 nanoparticles synthesized by the thermal decomposition method are easy to control in shape and size, have high crystallinity, high controllability in size, and small aggregation trend, and the method is more advanced in synthesizing iron oxide nanoparticles with higher performance. The Fe2O3 nanoparticles modified by PEG-DA (polyethylene glycol-dopamine) can increase hydrophilicity and improve biocompatibility, and the obtained Fe2O3@PEG-DA nanoparticles are good in stability and have good T1 performance.

The present invention discloses a high-toughness grouting material and its preparation method, belonging to the field of building materials technology. The raw materials, by mass percentage, include: 30-36% sulfoaluminate cement, 28-32% quartz sand, 0.4-0.9% nanographene / carbon tube hybrid, 12-15% ultrafine composite admixture, 1.0-1.8% temperature-sensitive shape memory alloy fiber, 1.5-2.0% microbial self-repairing capsule, 15-18% photochromic epoxy hybrid emulsion, 0.2-0.35% polycarboxylate water reducer, and 0.8-1.2% magnetic iron oxide / SiO2 expansion agent. The present invention achieves active suppression of crack widths ≤ 0.05 mm by using a magnetic field-directed expansion agent to compensate for shrinkage, temperature-sensitive fiber phase change toughening, and photochromic-microbial synergistic repair.