622 results about "Magnetite Nanoparticles" patented technology

The invention belongs to the technical field of environmental protection, and provides a preparation method of an imine-modified functionalized mesoporous magnetic silicon dioxide nano material. The method comprises the following steps: synthesizing Fe3O4 magnetic nanoparticles in a Fe < 2 + > / Fe < 3 + > alkaline hydrolysis system through a coprecipitation method; then coating the magnetic nanoparticles with an amorphous silicon dioxide layer by taking TEOS (tetraethoxysilane) as a silicon source by adopting a sol-gel method, so as to prepare magnetic silicon coated nanoparticles; the prepared nano-particles are subjected to secondary silicon coating guided by a cetyl trimethyl ammonium bromide (CTAB) mesoporous template agent, and mesoporous magnetic silicon nano-particles are formed after calcination; and finally, carrying out surface amination modification on the mesoporous magnetic silicon nano-particles by utilizing an amino silane coupling agent, and then carrying out condensation reaction on the mesoporous magnetic silicon nano-particles and various aldehyde derivatives to construct imine bonds, so as to obtain the imine-modified functionalized mesoporous magnetic silicon dioxide nano-material. The imine-modified functionalized mesoporous magnetic silicon dioxide nano-material formed by the invention has the characteristics of efficient adsorption, rapid magnetic recovery and excellent environmental stability, and can effectively remove polystyrene micro-plastics and organic pollutants in a water body.

The invention provides an easy-to-scale efficient biological magnetic separation system and method and application. The magnetic separation method comprises the following steps: marking a target object in a to-be-detected suspension by adopting magnetic nanoparticles, and putting the marked to-be-detected suspension into a separation container; a modularized magnet array is arranged in the separation container, the modularized magnet array is composed of permanent magnets, and the permanent magnets are assembled into the cuboid modularized magnet array; the surface of the permanent magnet is coated with a polytetrafluoroethylene coating; the modularized magnet array moves in the suspension under the control of a driving magnet arranged outside the separation container to generate a dynamic gradient magnetic field, and a target object is captured by the modularized magnet array under the action of the gradient force of the magnetic field; removing the liquid in the separation container; adding the resuspension into a separation container, and recovering a target object by physical ultrasonic washing; or adding a chemical dissociation solution into the separation container to recover the target object.

The invention belongs to the technical field of microbiological detection, and discloses a composite probe for detecting salmonella enteritidis and a preparation method. The composite probe for detecting the salmonella enteritidis comprises magnetic nanoparticles FeO, wherein the surface of the magnetic nanoparticles FeO is modified with an aptamer apt which is specifically combined with the salmonella enteritidis; the surface of the long afterglow nano particle PLNPs is modified with a DNA (Deoxyribose Nucleic Acid) sequence cDNA (Complementary Deoxyribonucleic Acid) complementary with the aptamer; the aptamer apt and the complementary DNA sequence cDNA are subjected to hybridization to form a composite probe structure FeO-SEapt (at) PLNPs-cDNA (complementary deoxyribonucleic acid). The long afterglow luminescence characteristic of PLNPs (ZnGaO: Cr) is utilized, and an excitation light source is stopped before detection, so that signal acquisition completely avoids autofluorescence of a sample matrix, background fluorescence interference is thoroughly eliminated, and the signal-to-noise ratio is remarkably improved.

The invention discloses a coating, a preparation method and application, and relates to the technical field of anticorrosive coatings. A dry film of the coating comprises 0.1 wt%-6wt% of a lamellar filler; the lamellar filler is prepared by loading magnetic nanoparticles on the surfaces of two-dimensional nanoparticles and coating a layer of high-molecular polymer. After the coating forms a film, a specific magnetic control orientation curing method is matched, so that high dispersion stability and planar orientation arrangement of the two-dimensional nano filler in a resin matrix are realized, and corrosion of water and oxygen to a base material can be effectively blocked. When the thickness of the coating dry film is only 1-2 microns, the coating dry film still has no obvious corrosion phenomenon after being subjected to a neutral salt spray test for 2000 hours. The metal base material with the thin coating thickness has heat conductivity, corrosion resistance and weather resistance, the preparation process is simple, the cost is low, and the metal base material has extremely high market application value.

According to the high-temperature-resistant nitrogen-fixing bacteria microcapsule fertilizer and the preparation method thereof, aiming at the problems of thallus inactivation and nutrient loss in a high-temperature environment, a sodium alginate-chitosan double-layer embedding technology is combined with magnetic nanoparticle modification, and a stable double-layer structure is formed by optimizing the ratio of an embedding material, so that the high-temperature-resistant nitrogen-fixing bacteria microcapsule fertilizer is prepared. The survival rate and activity of the nitrogen-fixing bacteria at high temperature are remarkably improved, and meanwhile, the functions of intelligent nutrient release and magnetic recovery are achieved. The fertilizer is prepared from composite microcapsules, amino acid, humic acid and other raw materials according to a specific ratio through magnetic field orientation treatment, multi-stage mixing, atomization granulation and magnetic field screening processes, the particle size is controlled to be 0.5-3.35 mm, and the shelf life is prolonged to 12 months. The method has the technical effects that trehalose-glycerol / sorbitol synergistically forms a glassy protective film to maintain the stability of thalli, gamma-aminobutyric acid activates nitrogenase gene expression, magnetic nanoparticles construct a photosynthetic symbiotic system to optimize rhizosphere oxygen supply, and silanized FeO nanoparticles fix heavy metal ions through electrostatic adsorption, so that the heavy metal ions in the thalli are effectively adsorbed, and the heavy metal ions in the thalli are effectively adsorbed. And the humic acid buffers the pH fluctuation of the soil, so that the nitrogen fixation efficiency is finally improved by 30-50%, and the crop yield is increased by 15-25%.

The invention discloses a preparation method of Fe3O4 magnetic nanoparticles rich in carboxyl groups on the surface, which comprises the following steps: modifying Fe3O4 nanoparticles by using polyethylene glycol and silicon dioxide to enhance the dispersity and biocompatibility of the magnetic nanoparticles, modifying the surfaces of PEG-Fe3O4 coated SiO2 nanoparticles by using a silane coupling agent containing silane groups and unsaturated double bonds to obtain the magnetic nanoparticles rich in carboxyl groups on the surface, and modifying the magnetic nanoparticles rich in carboxyl groups on the surface by using a silane coupling agent containing silane groups and unsaturated double bonds to obtain the magnetic nanoparticles rich in carboxyl groups on the surface. Then octavinyl-POSS and double bonds on the surfaces of the nano particles are subjected to click modification to form an octahedral cage, 4-mercaptobenzoic acid and double bonds are further subjected to click modification, the surfaces of the nano particles are rich in carboxyl, and a polymer brush rich in carboxyl is constructed. Compared with a conventional streptavidin coupling method, a high-density polymer chain provides a large number of carboxyl active binding sites, so that the streptavidin coupling amount is increased, the antibody coupling rate is increased, and a solution is provided for applications such as high-sensitivity biological detection, efficient targeted drug delivery and stable immunoassay.

The invention belongs to the technical field related to nanometer material testing, and discloses a magnetic nanoparticle relaxation time detection method and an environmental parameter detection method, and the method comprises the following steps: applying an excitation magnetic field around a to-be-detected target mixed with magnetic nanoparticles; obtaining magnetization response generated by the magnetic nanoparticles in any direction of the magnetic field plane, and obtaining phase lag corresponding to any order harmonic term of the magnetization response; according to the function relationship between the phase lag corresponding to any harmonic term and the Brown relaxation time of the magnetic nanoparticles, solving and obtaining the Brown relaxation time of the magnetic nanoparticles; wherein the function relationship comprises a correction term introduced by magnetic dipole interaction of the magnetic nanoparticles. The magnetic dipole interaction among the magnetic nanoparticles is introduced, relaxation time detection of particle space distribution under an external magnetic field is corrected, the interference of the magnetic dipole interaction on the magnetic nanoparticle Brown relaxation time detection process can be effectively reduced, and accurate estimation of the magnetic nanoparticle Brown relaxation time is realized.

A magnetic nanoparticle composite microcapsule, and a preparation method therefor and the use thereof. The preparation method comprises: diluting concentrated ammonia water with absolute ethanol in which nano-Fe3O4 is dispersed, stirring same and adding ethyl orthosilicate, centrifuging same, and then performing washing to obtain Fe3O4 / SiO2 particles; dispersing same in anhydrous ethanol, then adding isopropanol containing tetrabutyl titanate, and performing a treatment to obtain Fe3O4 / SiO2 / TiO2 nanoparticles; adding polyurethane TDI prepolymer to the Fe3O4 / SiO2 / TiO2 nanoparticles, adding same to a core material, then dripping an emulsifier, and stirring same to obtain a core material emulsion; and heating same in a water bath, dropwise adding butanediol, and performing heating, stirring and vacuum filtration to obtain a magnetic nanoparticle composite microcapsule. By means of the loading with a core material having a repair function, the prepared magnetic microcapsule can actively repair damage to an insulating material caused by electrical and mechanical stress, thereby improving the reliability of a device.

This disclosure relates to magnetic microgel beads, and in particular to magnetic microgel beads for biofunctionalization and methods of making and uses thereof, for example, in biosensing assays. In an embodiment, a magnetic microparticle comprising a magnetic nanoparticle encapsulated by a polymer hydrogel. In another embodiment, an assay for detecting the presence of a target analyte in a sample comprising a) the magnetic microparticle disclosed herein, wherein the biorecognition agent further comprises a reporter moiety; b) an electrochemical chip comprising a working electrode, a counter electrode and a reference electrode; and c) a capture probe functionalized on the working electrode; wherein binding of the biorecognition agent to the target analyte results in production of an electrochemical, electroluminescent or photoelectrochemical signal.

The invention provides a Brown relaxation dominated magnetic nanoparticle nonlinear biological information parameter estimation method. The method comprises the following steps: putting a container of a magnetic nanoparticle sample into a to-be-detected object area; applying low and medium frequency alternating current magnetic field excitation to the magnetic nanoparticle sample; collecting magnetization response information of the magnetic nanoparticle sample in real time and extracting harmonic amplitude information from the magnetization response information; carrying out series expansion on the Fokker-Planck equation by using a disturbance expansion method, and deducing a harmonic analytical expression under the Brown relaxation condition; respectively establishing a corresponding temperature estimation model and a hydrodynamic diameter estimation model on the basis of the harmonic analytical expression; respectively substituting the measured harmonic amplitude information into a temperature estimation model or a hydrodynamic diameter estimation model based on a harmonic analytical expression; and respectively solving an equation set formed by the temperature estimation model or the hydrodynamic diameter estimation model to obtain temperature information or hydrodynamic diameter information. According to the invention, the measurement precision and the time resolution of the magnetic nanometer temperature measurement and biomarker identification tool can be improved.

The invention relates to the technical field of synthesis of chemical products, in particular to a synthesis method of acryloyloxyethyl trimethyl ammonium chloride. According to the method, a one-pot reaction system is adopted, ethyl acrylate and N, N-dimethylaminoethanol are taken as raw materials and are subjected to quaternization reaction with chloromethane under an alkaline condition, and efficient conversion is realized through the synergistic effect of a composite catalytic system and a polymerization inhibitor. The composite catalyst is constructed by compounding magnetic nanoparticles and a metal organic framework material, forms a multilevel structure through titanate crosslinking, and has high catalytic activity and magnetic separation and recovery characteristics. The method simplifies the traditional step-by-step process, has the advantages of simple and convenient one-pot operation, recyclable catalyst, high raw material utilization rate, environmental friendliness and the like, and is suitable for large-scale preparation of acryloyloxyethyl trimethyl ammonium chloride.

The invention discloses a sewage treatment method based on reinforcement of composite magnetic nanoparticles, and belongs to the technical field of sewage treatment, and the sewage treatment method comprises the following steps: 1, pretreatment: intercepting large-particle-size floating objects in wastewater by using a grid, and stirring by using an adjusting tank to uniformly mix water; in the second step, composite magnetic nanoparticles are added into the pretreated wastewater, and nitrogen and phosphorus adsorption and electric energy collection and storage are achieved at the same time; 3, separation: separating the composite particles through a magnetic separation device, and further purifying the wastewater through a sedimentation tank; 4, regeneration: forming an electric field by utilizing the collected electric energy, desorbing particles by combining with a neutral solution of an antibiotic degradation product, and recycling after cleaning; 5, standard reaching and energy consumption balance are carried out, the wastewater is disinfected, the water quality is monitored, the stirring speed and the power supply proportion are adjusted in a linkage mode, and standard emission and energy consumption self-balance are ensured. The method does not need to depend on microorganisms, particles and energy recycling, the treatment efficiency is high, and the operation cost is low.

The application belongs to the technical field of biology and specifically relates to a method for analyzing glycans on single extracellular vesicles in a fluid sample. The method uses magnetic nanoparticles to capture and manipulate EVs, based on the specific affinity of lectins for specific glycan structures, uses polydisperse microdroplets to separate the captured EVs, realizes local signal amplification in the droplets through enzymatic reaction, adopts fluorescence microscopy to collect images of the droplets, and thus realizes identification and analysis of the glycan components on single EVs. The preparation process of the microdroplets formed by the oscillating emulsification method of the application makes the entire detection process more simple and fast, does not require any microfluidic chip and special device, and can be completed in a centrifugal tube, and all the microdroplets are generated in parallel and quickly, and the amount of microdroplets can be flexibly expanded. Moreover, compared with the traditional ELISA, the method has high sensitivity, low detection limit and small sample consumption.

The invention belongs to the technical field of biological detection, and particularly relates to a bisulfite-free detection kit for specific site 5-methylcytosine and a detection method thereof. According to the method, a TAPbeta treatment method is adopted, 5hmC is sealed through beta-GT, 5mC oxidation is carried out through TET, and 5mC is reduced into dihydrouracil (DHU) through pyridine borane, so that the apparent difference between 5mC and C and 5hmC is converted into single nucleotide polymorphism difference. In addition, a flow microsphere technology based on PNA-assisted click chemical connection starting is established to detect DNA methylation specific sites. A PNA clip is innovatively introduced into click chemical connection, and non-specific connection is inhibited. Target sequence enrichment, signal amplification and signal acquisition are carried out through surface-functionalized magnetic nanoparticles, and the detection sensitivity is improved to fM. The invention provides a new tool for high-specificity and high-sensitivity epigenetic marker detection.

The invention relates to the technical field of electromagnetic shielding materials, and particularly discloses an electromagnetic shielding composite material with active and passive infrared stealth functions and a preparation method thereof. The composite material comprises an electromagnetic wave reflecting layer and a plurality of electromagnetic wave absorbing layers. The electromagnetic wave reflecting layer is made of silver-plated bacterial cellulose, and efficient reflection of electromagnetic waves is achieved through high conductivity of the silver-plated bacterial cellulose. The electromagnetic wave absorbing layer is formed by compounding bacterial cellulose, multi-walled carbon nanotubes and core-shell magnetic nanoparticles, and the content of the multi-walled carbon nanotubes is gradually decreased and the content of the core-shell magnetic nanoparticles is gradually increased from the position close to the electromagnetic wave reflecting layer to the outside, so that a gradient structure is formed; the gradient design can improve surface impedance matching, promote electromagnetic waves to enter the material, and enhance electromagnetic loss through an interlayer multiple reflection-absorption process. The material disclosed by the invention has the functions of efficient electromagnetic shielding and active and passive infrared stealth.

The invention relates to the technical field of burn and scald treatment, in particular to an intelligent hydrogel dressing for targeted regulation and control of Mongolian medicine release. The dressing comprises a core-shell microsphere drug loading system used for realizing physical segmentation of a functional area; the dual-release system is used for realizing surface adsorption of quick-release drug nanoparticles and internal wrapping of sustained-release microspheres; a hydrogel matrix for forming a nanofiber network; and the magnetic control regulator is magnetic nanoparticles dispersed in the hydrogel matrix, and regulates the aperture of the hydrogel network through the action of an external magnetic field. According to the intelligent hydrogel dressing for targeted regulation and control of Mongolian medicine release, the Mongolian medicine compound intelligent hydrogel dressing is developed on the basis of a TRIZ innovative method; through a core-shell microsphere drug loading system and a dual release design, high drug loading capacity and accurate drug release control are synchronously realized.

The invention relates to the technical field of sensing of magnetic nano photoelectric materials, in particular to a responsive microsphere based on a three-dimensional magnetic photonic crystal and a preparation method and application thereof, and the responsive microsphere is formed by arranging polyhydroxy compound modified magnetic nanoparticles in a spherical polymer into a non-close packing face-centered cubic or body-centered cubic structure. The responsive microsphere based on the three-dimensional magnetic photonic crystal is easy in color distinguishing, has no angle dependence, does not need to depend on a fluorescent dye or a radioactive label, can realize real-time and in-situ monitoring through own optical characteristics, breaks through the bottlenecks of sensitivity and resolution of a traditional sensor, realizes visual detection, simplifies the detection process, and is suitable for mass production. The cost is reduced. According to the responsive microsphere based on the three-dimensional magnetic photonic crystal, the substance diffusion path is shortened through the small size of the responsive microsphere, and the response speed is remarkably increased in combination with the high specific surface area.

The present application belongs to the field of magnetic nanoparticle measurement, and particularly relates to a high-sensitivity magnetic nanoparticle spectrometer and a waveform signal conversion method thereof, and aims to solve the problem that the dynamic magnetic characteristics of low-concentration magnetic nanoparticles cannot be quantitatively evaluated in the prior art. The present application comprises a driving module, a switching module, a current sampling module, a band-pass filtering module, a rectifying module, a current control module, a voltage adjustment module, a coil matching module, a coil assembly, a receiving coil signal processing module, a signal acquisition analog block, and a main control calculation module. According to the target current demand, the coil matching module can be flexibly edited, and further, the control signal for driving the coil can be automatically generated according to the matched driving circuit and the target waveform, wherein the data acquisition-processing link can restore the waveform and obtain the original spectrum of the magnetic particles through the built-in calculation steps. At the same time, the current compensation loop contained in the present application can compensate the current error caused by factors such as coil temperature rise, parameter drift of the matching module, and change of the on-resistance of the switching module, so as to ensure the constant output of the target harmonic current.

The application discloses a kind of based on magnetic resonance spectrum half-width's magnetic nano particle mass concentration calculation method, belong to magnetic nano material testing technical field, the application with magnetic nano particle induces local magnetic field inhomogeneity and causes magnetic resonance spectrum to produce change as medium, the relationship between the mass concentration of magnetic nano particle and magnetic resonance spectrum half-width is established, since the saturation magnetization intensity of single magnetic nano particle is fixed, so the change of the mass concentration of magnetic nano particle is essentially the change of the number of magnetic nano particle, mass concentration and magnetic resonance spectrum half-width have linear relationship, the change of magnetic nano particle mass concentration can be reflected by measuring magnetic resonance spectrum half-width, realize the measurement of magnetic nano particle mass concentration.

The invention relates to a method and system for detecting cells of a first cell type (1) in a biopsy sample in which a plurality of cells of different cell types (2, 3) are present. The invention further relates to a device for carrying out a magnetic field measurement on cells of a biopsy sample that are labeled with magnetic nanoparticles. The method comprises the following method steps: carrying out tissue dissociation of the biopsy sample in order to singulate the cells present in the biopsy sample; supplying magnetic nanoparticles (11) to the singulated cells in order to selectively label the cells of the first cell type (1); removing the excess magnetic nanoparticles (11); introducing the cells into a microchannel (5), the microchannel (5) having a cross section which allows only one labeled cell (1) to pass through at a time; carrying out a magnetic field measurement in the microchannel (5) by means of a quantum magnetic field sensor (6) based on the F-center principle; and sorting out the labeled cells (1) after they have passed through the microchannel (5).

The invention provides a functional modified glass fiber and a modification method thereof, and the modification method comprises the following steps: (1) immersing magnetic nanoparticles into a carbon source solution, and reacting to obtain magnetic nanoparticles deposited with a carbon source; (2) immersing glass fibers into the modifier aqueous solution for reaction to obtain modified glass fibers; and (3) adding the modified glass fiber and the magnetic nanoparticles deposited with the carbon source into water, uniformly stirring and mixing, and reacting in an inert atmosphere to obtain the functional modified glass fiber. According to the invention, the functionalized modified glass fiber with stable, uniform and firm surface loaded with the carbon-coated magnetic nanoparticles can be obtained; the loading capacity of the carbon-coated magnetic nanoparticles on the glass fiber exceeds 8%, and the saturation magnetization of the glass fiber after functional modification is improved to about 70 emu / g.

The application provides a method for widening the effective bandwidth of a wave-absorbing material, and comprises a preparation method of a composite material: mixing magnetic metal hydrotalcite and expanded graphite into a multiphase fluid, then introducing the multiphase fluid into a high-speed shearing microcavity in a circulation mode, using the high-speed fluid boundary layer shearing force to realize the interlayer peeling of the magnetic metal hydrotalcite and the expanded graphite, and self-assembling into a two-dimensional / two-dimensional stacked sheet-shaped magnetic particle / few-layer graphite electromagnetic wave absorbing powder. The application proposes a two-dimensional / two-dimensional structure formed by sheet-shaped magnetic nanoparticles and few-layer graphite for a carbon-based magnetic particle composite material. The two-dimensional electron gas is easy to form at the interface, and the resonance loss different from the interface relaxation can be realized by the resonance of the plasmon and the incident microwave. On the other hand, the magnetic performance of the sheet-shaped magnetic nanoparticles can be secondarily regulated, the mode of Aharoni exchange resonance is changed, the dielectric loss and the magnetic loss are improved in an integrated manner, and the effective bandwidth of the material for absorbing electromagnetic waves is widened.

Disclosed are systems, methods, and computer software for determining a conformational change in a structure of a protein. One method includes delivering a magnetic nanoparticle-nanobody (MNP-NB) complex to a sample containing a protein, where the MNP-NB complex will bind to the protein in the sample. An external magnetic field is applied to the sample with a magnetic field generation system. Signals are detected from the MNP-NB complex that reflect a response to the external magnetic field and a conformational change in a structure of the protein in the sample is determined from the signals.

The invention provides an extrusion cogging method for realizing alloy surface nanocrystallization, which comprises the following steps: A) sequentially performing two-stage solution treatment and equal-diameter angular extrusion on an alloy bar, and applying alternating pulse current while performing equal-diameter angular extrusion to obtain an alloy subjected to dynamic strain aging pretreatment; b) placing the alloy subjected to dynamic strain aging pretreatment in a magnetic field, driving magnetic nanoparticles to impact the surface of the alloy by utilizing high-frequency vibration, and carrying out surface nanocrystallization; and C) placing the alloy workpiece subjected to surface nanocrystallization in a mold, and simultaneously carrying out in-situ superplastic forming and aging strengthening to obtain the formed alloy workpiece. According to the method, the dislocation density and the nano-structure thermal stability of the alloy material can be improved; the surface roughness Ra of the alloy material is effectively reduced to be smaller than or equal to 0.05 mu m, phase change is induced while in-situ superplastic forming deformation is conducted, a strengthening phase (such as gamma ') can be finer and more evenly distributed, and therefore higher strength and fatigue performance are obtained.

The invention belongs to the technical field of drilling fluids in petroleum and natural gas development, and particularly relates to a rigid-flexible nanoparticle reinforced foam drilling fluid and a preparation method thereof. The foam drilling fluid comprises composite magnetic nanoparticles, potassium chloride, a surfactant, a nanocellulose material and deionized water, wherein the composite magnetic nanoparticle has a core-shell multi-layer structure which takes a magnetic material as an inner core and sequentially wraps a primary polymer layer, a porous carrier framework layer and a rigid-flexible composite shell layer on the outer layer, and the rigid-flexible composite shell layer consists of a flexible polymer matrix and a rigid polymer matrix. According to the foam drilling fluid, online optimization of viscosity and shear dilution characteristics of a foam drilling fluid system is realized, and dynamic regulation and control of rheological properties of the foam drilling fluid in a complex stratum environment are realized; and moreover, environmental pollution is reduced, and green well drilling and sustainable well drilling can be achieved.

The invention relates to liquid metal-based dual-network magnetic hydrogel as well as a preparation method and application thereof. The hydrogel comprises dual-network hydrogel and magnetic Fe3O4 nanoparticles loaded in a network structure of the dual-network hydrogel, the double-network hydrogel comprises a first network structure and a second network structure, wherein the first network structure is a network structure formed by polymerizing a liquid metal coated sodium alginate chain, and the second network structure is a polyacrylamide network structure formed by polymerizing an acrylamide monomer; the mass ratio of the liquid metal to the magnetic Fe3O4 nanoparticles is (0.5-2): (0.5-1.0). Compared with the prior art, the composite hydrogel not only can effectively shield electromagnetic radiation, but also has good intelligent magnetic responsiveness, and the application prospect of the composite hydrogel in the fields of intelligent materials, sensors, electromagnetic shielding and the like is widened.

The present application belongs to the technical field of plant tissue culture, and particularly relates to a high-efficiency rooting and seedling raising method for plant tissue culture seedlings, S1 trimming and disinfection of S2 induction liquid immersion, S3 composite substrate implantation and gradient environment regulation, S4 substrate transplanting and planting; the core is to use modified magnetic biochar composite substrate loaded with FeO nanoparticles, cooperate with the synergistic effect of microencapsulated rooting hormone and melatonin, realize in-situ integrated seedling raising through composite spectrum containing UV-A, CO pulse supply, gradient humidity and PEG osmotic pressure domestication. The present application effectively inhibits basal browning, shortens the seedling raising period, improves the rooting quality and transplanting survival rate, overcomes the pollution prejudice of magnetic nanoparticles, is suitable for woody and herbaceous plants, and can be applied to plant tissue culture seedling production on a large scale.

This invention belongs to the field of wastewater treatment technology and discloses a mechanical catalytic treatment method and system for wastewater and contaminated groundwater. The mechanical catalytic treatment method for wastewater and contaminated groundwater includes the following steps: adding a treatment agent to the wastewater to be treated, mixing and reacting, filtering, and completing the wastewater treatment; wherein, the treatment agent includes at least one of piezoelectric catalytic material and magnetic resin; the mixing reaction is carried out under ultrasonic cavitation and / or spiral aeration conditions; the piezoelectric catalytic material includes a porous plant cellulose fiber carrier and a C3N5 functional layer in situ grown on the surface of the carrier; the magnetic resin includes a benzo-melamine-formaldehyde resin matrix with sulfonic acid groups bonded to a benzene ring and Fe3O4 magnetic nanoparticles uniformly dispersed in the resin matrix. This invention eliminates the need for chemical agents in wastewater treatment, avoids secondary pollution, effectively treats complex water bodies while reducing operating costs, and possesses good environmental friendliness and practicality.

The present application belongs to the technical field of biological medicine, and particularly relates to a thiol phenylboronic acid mediated nano-enzyme immunochromatography reagent and application thereof. The present application utilizes the broad-spectrum binding ability of MPBA to the glycosylated molecules on the surface of pathogens, and combines the colorimetric catalytic double enhancement effect of the virus-like biomimetic magnetic nano-enzyme (FeAu@AuIr), to improve the detection sensitivity. The probe takes Fe3O4 magnetic nanoparticles as the core, and sequentially loads large-diameter gold nanoparticles (Au) and gold-iridium alloy (AuIr) with high catalytic activity, to enhance the pathogen capture capacity and signal amplification effect. Combined with the antibody modified immunochromatography strip, Streptococcus pneumoniae, Pseudomonas aeruginosa and SARS-CoV-2 can be simultaneously detected, and the detection sensitivity is greatly improved. Through verification of 170 clinical samples, the present application has good application prospect in on-site rapid detection, and provides an efficient and low-cost solution for precise screening of respiratory tract infectious pathogens.

The present invention relates to a method for the selective concentration and / or separation of metal compounds from particulate material using magnetic nanoparticles modified with at least one organic acid in an aqueous solution, preferably with a pH value in the range of pH 3.5 to pH 11, and the use for the recycling of rare-earth compounds, preferably for the recycling of rare-earth oxides from fluorescent lamps.