299 results about "Magnetic nanoparticles" patented technology

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 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 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 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 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.

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 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.

The invention discloses a magnetic nanoparticle-carbon nanotube in-situ composite material as well as a preparation method and application thereof. The composite material comprises a carbon nano tube and magnetic nano particles, the carbon nanotubes are combined with the magnetic metal particles, and the magnetic nanoparticles are distributed among the carbon nanotubes and are distributed near the magnetic metal particles in a concentrated manner. The aerogel formed by floating vapor deposition is in contact with the dispersion liquid with the magnetic nanoparticles, so that the magnetic nanoparticles are guided among the carbon nanotubes, electromagnetic shielding is realized, and in the process, a catalytic source containing magnetic metal elements is adopted, so that magnetic metal particles are constructed in the structure of the carbon nanotubes, and the electromagnetic shielding effect is improved. The metal particles are naturally dispersed and distributed in the carbon nano tube network, so that the magnetic nano particles can be guided to aggregate towards the dispersed metal particles respectively, and uneven distribution and mechanical weakness caused by aggregation of a large number of magnetic nano particles in the space are avoided.

A plurality of magnetic nanoparticles (30) are mixed with a solvent (111). An external magnetic field is applied to the solvent in which the plurality of magnetic nanoparticles are mixed. By doing so, the plurality of magnetic nanopowders are linearly connected, and a plurality of thread-like magnetic powders (100), in which a plurality of magnetic nanopowders are magnetically oriented along an extension thereof, are generated. The solvent is vaporized to take out the plurality of thread-like magnetic powders. Extrusion molding is performed in a state in which the plurality of thread-like magnetic powders and a liquid molding resin are mixed. By doing so, the plurality of thread-like magnetic powders are extended in the pressing direction, and a magnetic body in which the plurality of thread-like magnetic powders are arranged in a direction orthogonal to the pressing direction is produced.

The invention discloses a magnetic nanoparticle anchored heterogeneous carbon-based heat-conducting and wave-absorbing integrated material and a preparation method thereof, and belongs to the field of functional composites.The preparation method comprises the steps that melamine foam is acidized, and then acidized MF is soaked into a zinc salt, cobalt salt and 2-methylimidazole methanol solution; the obtained MF (at) ZnCo-ZIF is subjected to high-temperature calcination, and the heterogeneous carbon-based heat conduction and wave absorption integrated material anchored by the Co magnetic nanoparticles is obtained. The Co magnetic nanoparticle anchored heterogeneous carbon-based heat-conducting and wave-absorbing integrated material has the advantages of controllable morphology, high heat conductivity and strong wave-absorbing performance through the synergistic strengthening effect of the high-graphitization heterogeneous carbon material with high heat / conductivity and high dielectric loss and the Co magnetic nanoparticles with high magnetic conductivity and high magnetic loss; actual requirements of different scenes can be met, and a new thought is provided for research and development of a high-performance heat-conducting and wave-absorbing integrated material.

The invention relates to a high frequency magnetic induction device (100). The device (100) comprises magnetic nanosuspension (101) and an AMF generator (103). The AMF generator (103) further comprises copper induction coil (104), work head (105), flexible connector (106), power supply (107), chiller (108), display and control unit (109), fiberoptic thermometer sensors (110a &110b), auto-manual toggle switch (111), USB port (112a &112b) and bed support (113). Tumor site enclosed by the magnetic nanosuspension (101) comprising iron oxide magnetic nanoparticles (102) generates heat when exposed to AMF generated by the AMF generator (103). The heat generated does not cause any harm to the healthy tissues. The AMF generator (103) has precise control over thermal doses generated. The high frequency induction device (100) is safe, effective, non-invasive with mild side-effects.

The application discloses a kind of detection flavonoid compound magnetic composite material, preparation, detection method and the application of preparation standard substance, belong to analytical chemistry technical field.Magnetic composite material includes magnetic nanoparticle core, double lanthanide series metal organic framework (MOF) first shell and covalent organic framework (COF) second shell successively coated on its surface, and phenylboronic acid group grafted on the surface of second shell.The material uses the specific covalent binding of phenylboronic acid and the characteristic ortho-diphenol hydroxyl group of flavonoid compound to realize efficient capture and enrichment;Through double lanthanide series MOF shell, promote energy transfer, COF shell provides high specific surface area and ordered diffusion channel, and magnetic core is convenient for rapid separation, which realizes high selectivity identification of flavonoid compound.The material has the advantages of high sensitivity, strong anti-matrix interference ability, rapid and simple detection, etc., and is suitable for accurate analysis of flavonoid compound in complex sample and development of related standard substance.

The invention discloses an organic pollutant water treatment adsorption material and a preparation method thereof in the technical field of water treatment materials. The organic pollutant water treatment adsorption material comprises the following components in parts by weight: 2-4 parts of a material monomer I, 3.5-7 parts of a material monomer II, 3.2-6.5 parts of ferric chloride hexahydrate, 0.36-1.0 part of copper nitrate trihydrate and 0.3-1.2 parts of zinc nitrate hexahydrate. Through full-chain collaborative design of monomer synthesis, multifunctional COF framework construction, magnetic modification and bimetallic active site loading, the bottleneck that a traditional adsorption material is low in capacity, slow in speed, difficult to recycle and poor in selectivity is broken through, the monomer I provides a high-density porphin ring, the monomer II constructs a high-porosity COF framework through multiple functional groups, and the adsorption material is prepared through magnetic modification. Cu < 2 + > / Zn < 2 + > and nitrogen atoms of the porphin ring form strong coordination active sites, and loading of the magnetic nanoparticles enables the density of the active sites to be perfectly matched with a pore structure, so that site waste or pore blockage is avoided.

Arrangement of artificial adaptive intraocular lenses whose operating mode is based on binocular interaction and the accommodation-convergence reflex of the eyes, i. wherein all electrically activated adaptive intraocular lenses (8)(9)(10) comprise activation mechanisms and are operated without interaction between the left and right eye, characterized in that ii. the arrangement of the novel artificial adaptive intraocular lenses, whose operating mode is based on binocular interaction (11.3)(12.3)(5) and the accommodation-convergence reflex of the eyes, is characterized by the inclusion of a microchip, wherein a microchip is used for each intraocular lens of each eye, the microchip containing magnetic nanoparticles with electromagnetic properties and made of biocompatible, non-cytotoxic material (5.1)(3.1)(4.1), wherein a conductor connected to the microchip forms a closed loop (5.2)(3.2)(4.2), and wherein the change in the distance between the microchips of the artificial intraocular lenses of the right and left eye during the convergence movements (5.3)(11.2)(12.2) and divergence movements (5.3)(11.1)(12.1) changes both the strength and the phase of the electromagnetic field (5.4) between the two microchips (5.1)(3.1)(4.1) of the two artificial intraocular lenses, which interact with each other, wherein this change in the strength and phase of the electromagnetic field (5.4) causes the generation of an electric charge or voltage at the ends of the conductor (5.5)(3.3)(4.3), which leads to an electric current flow (5.6)(3.4)(4.4) through the closed loop of the conductor (5.2)(3.2)(4.2) due to the induced voltage and according to the principle of electromagnetic induction.

The invention discloses a supported bimetallic complex catalyst for synthesizing isovanillin and a preparation method and application thereof.The catalyst is composed of an inorganic porous carrier and an active component supported on the inorganic porous carrier, and the active component is a bimetallic complex formed by Cu, Co and 1, 10-phenanthroline; the inorganic porous carrier is an SBA-15 molecular sieve or amino-modified Fe3O4 (at) SiO2 magnetic nanoparticles with a core-shell structure. The catalyst is prepared from a metal salt, a ligand and a carrier in a solvent through a coordination-loading one-step method. The catalyst disclosed by the invention is applied to one-step synthesis reaction of isovanillin by taking heliotropin and sodium methoxide or potassium methoxide as raw materials, and shows extremely high catalytic activity and product selectivity (yield gt; and by virtue of the load-type characteristic, especially the application of the magnetic carrier, rapid magnetic separation and recovery and repeated recycling can be realized, so that the catalyst is obviously superior to a traditional homogeneous copper chloride catalytic system, and has the potential of simple steps, environment friendliness and suitability for industrial production.

This invention discloses a method for reconstructing magnetoacoustic electromagnetic particle images based on time-reversal. This method utilizes the method of moments discretization, combining the voltage-time inversion formula with the theory of the magnetoacoustic electromotive force problem for magnetic particles. It reconstructs the spatiotemporal discrete signals of the first and second derivatives of the voltage acquired by the electrodes into an equivalent field source distribution within the imaging region. A unit current is injected across the electrodes, and the potential distribution is obtained by solving the reciprocal potential Poisson equation. Combining the field source and the reciprocal potential distribution, the discrete divergence field of the magnetic nanoparticle concentration can be calculated, and then expressed as a five-point difference form of the Poisson equation. Finally, the Gauss-Seidel iterative method is used to solve this equation to obtain an image of the magnetic nanoparticle concentration distribution. This invention effectively reduces computational complexity and storage requirements, significantly improves imaging speed, and expands the application potential of this technology in the field of medical imaging.

This invention provides an integrated treatment system for harvesting microalgae using recyclable magnetic nanoparticles while simultaneously promoting methane production, belonging to the field of algal resource utilization and disposal. The specific method includes: uniformly mixing synthesized magnetic nanoparticles with algal liquid; harvesting and concentrating microalgae using magnetic separation; mixing the magnetic-algae aggregates with waste activated sludge in a certain proportion and then anaerobically treating the sludge; and finally recovering the magnetic nanoparticles from the anaerobic co-digestion residue using air flotation. Results show that compared with existing technologies, this invention achieves over 95% high-efficiency integrated treatment of microalgae harvesting and anaerobic co-digestion, without requiring the addition of magnetic nanoparticles during the anaerobic co-digestion process; it simplifies the process flow, achieves harmless treatment of microalgae and waste activated sludge, and further promotes methane production in the subsequent anaerobic co-digestion process; it also enables the recovery and reuse of magnetic nanoparticles, has simple operating equipment, and produces virtually no secondary pollution.

This invention provides a self-splicing large-size single-crystal diamond substrate and its manufacturing method, belonging to the field of single-crystal diamond technology. The method includes the following steps: in-situ printing a light-treated resin barrier layer on the non-splicing surface of the single-crystal diamond; mechanically grinding the splicing surface of the single-crystal diamond; immersing the splicing surface of the single-crystal diamond in a magnetic nanoparticle precursor dispersion; aligning the splicing surfaces of the single-crystal diamonds to be spliced ​​with each other, applying an external magnetic field in a specific direction to align and tightly adhere the splicing surfaces; subjecting the spliced ​​diamond to high-temperature annealing in a reducing atmosphere or vacuum environment; and placing the spliced ​​diamond in a strong acid cleaning solution to dissolve and remove residual metals and impurities from the diamond surface. This invention utilizes small-size single-crystal diamonds with excellent surface quality for splicing to obtain large-size single-crystal diamonds, preserving the thermal and mechanical properties of single-crystal diamonds while achieving wafer-level large-size expansion.

The invention relates to the field of radar wave-absorbing materials, in particular to a magnetic carbon nanobelt wave-absorbing agent and a preparation method thereof. The magnetic carbon nanobelt wave-absorbing agent comprises nitrogen-doped carbon converted by polyimidazolium salt and magnetic nanoparticles carbonized and converted by ferric iron salt; the average particle size of the magnetic nanoparticles is 5nm-20nm, and the mass loading capacity of the magnetic nanoparticles is 20%-50%. The magnetic carbon nanobelt wave-absorbing agent provided by the embodiment of the invention can give consideration to dielectric loss and magnetic loss, and the wave-absorbing performance of the material is improved.

The application 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 reflection layer and a multilayer electromagnetic wave absorption layer. The electromagnetic wave reflection layer is silver-plated bacterial cellulose, and high-efficiency electromagnetic wave reflection is realized by utilizing the high conductivity of the silver-plated bacterial cellulose. The electromagnetic wave absorption layer is composed of bacterial cellulose, multi-walled carbon nanotubes and core-shell magnetic nanoparticles, and from the side close to the electromagnetic wave reflection layer to the outside, the content of the multi-walled carbon nanotubes decreases, and the content of the core-shell magnetic nanoparticles increases, so that a gradient structure is formed; the gradient design can improve the surface impedance matching, promote the electromagnetic wave to enter the material interior, and enhance the electromagnetic loss through the interlayer multiple reflection-absorption process. The material has the functions of high-efficiency electromagnetic shielding and active and passive infrared stealth.

A temperature-sensitive magnetic fluid that realizes a cooling device with higher cooling performance and a magnetic fluid drive device that uses the temperature-sensitive magnetic fluid are provided. [Solution] The thermosensitive magnetic fluid 1 includes a composite 13 formed by combining a thermoresponsive gel 11 and magnetic nanoparticles 12. The composite has a structure in which the magnetic nanoparticles are encapsulated in the thermoresponsive gel or a structure in which the magnetic nanoparticles are adsorbed on the surface of the thermoresponsive gel.

The application discloses a temperature measuring method and device based on a Faraday magneto-optical effect of magnetic nanoparticles, and belongs to the technical field of nano material testing. The method comprises the following steps: placing a magnetic nanoparticle sample in a target area, and making the magnetic nanoparticles generate a magnetization response through an applied direct current excitation magnetic field; adopting a polarized light to irradiate the magnetic nanoparticles in the coaxial direction of the magnetic field, so that the Faraday magneto-optical effect occurs between the magnetic nanoparticles and the sample; taking a sample without adding magnetic nanoparticles as a control group, applying an excitation magnetic field with the same amplitude and opposite direction to the applied direct current excitation magnetic field to the sample, and detecting the emergent light; calculating the Faraday rotation angle generated by the magnetic nanoparticles according to the detected emergent light; and performing nonlinear fitting on the Faraday rotation angle generated by the magnetic nanoparticles and the applied direct current excitation magnetic field by using a Lenz function, so as to obtain the temperature of the magnetic nanoparticles in the target area. The application can realize remote and non-invasive in-vivo temperature measurement.

The application discloses a gel carrier suitable for low-temperature sewage treatment, a preparation method and application, and the gel carrier is divided into two layers, the upper layer of the gel carrier is a light-heat conversion layer, and the lower layer of the gel carrier is a microbial growth layer, anaerobic ammonia oxidation bacteria are embedded in the lower layer of the gel carrier, the thickness ratio of the light-heat conversion layer to the microbial growth layer is controlled to be 1-1.5:4, magnetic nanoparticles are added in the gel preparation process to form a heterojunction, the microenvironment temperature is improved through a light-heat-magnetic heat synergistic effect, the low-light limitation in winter is broken, and the reactor can be rapidly started under a low-temperature condition of 15 DEG C. The prepared gel carrier can decompose nitrogen-containing pollutants in wastewater in an anaerobic environment.

The invention discloses a drug-loaded nanoparticle as well as a preparation method and application thereof. The drug-loaded nanoparticle can be used for treating triple negative breast cancer, and specifically comprises a magnetic nanoparticle, an active component loaded in the magnetic nanoparticle, and an erythrocyte membrane coating the magnetic nanoparticle, wherein the active ingredients are selected from one or more of piperlongumine, polyphyllin II, erianin, pseudolaric acid, 6-gingerol, ginkgetin, solasonine, cucurbitacine B and lycorine. In practical application, the drug-loaded nanoparticles have good biological safety, long circulation capability and high tumor retention capability, and can generate efficient killing and treatment effects on triple-negative breast cancer by inducing cell apoptosis.

The application discloses a magnetic carbon nanomaterial hydrogel, a preparation method thereof and seawater desalination application. The magnetic carbon nanomaterial hydrogel comprises a hydrogel, carbon nanomaterial and magnetic nanoparticles distributed in the hydrogel. The preparation method comprises the following steps: 1) mixing the hydrogel, the carbon nanomaterial and the magnetic nanoparticles to obtain a mixed solution; 2) freezing the mixed solution obtained in the step 1) to obtain a frozen product; 3) thawing the frozen product obtained in the step 2); 4) repeating the freezing in the step 2) and the thawing in the step 3) to obtain the magnetic carbon nanomaterial hydrogel. The magnetic carbon nanomaterial hydrogel prepared by the application can realize dynamic compression self-drainage through geometric deformation of an elastic magnetic evaporation body under the action of a magnetic field, and can improve the water evaporation rate of a photothermal interface water evaporation body.

This invention discloses a method for preparing cationic and amphiphilic quaternized composite magnetic nanoparticles, comprising the following steps: Step S1, preparing magnetic iron oxide nanoparticles using a hydrothermal method; Step S2, preparing silica-coated magnetic iron oxide nanoparticles using the Stober method; Step S3, preparing cationic and amphiphilic quaternized composite magnetic nanoparticles using an electrostatic self-assembly method. This invention uses low-cost alkane quaternary ammonium salts as functional monomers to achieve a three-layer core-shell structure comprising an iron oxide magnetic core, a silica intermediate bridging layer, and an alkane quaternary ammonium salt functional outer layer. The alkane quaternary ammonium salt is stably loaded onto the silica surface through a non-covalent grafting mechanism of electrostatic self-assembly, thereby achieving mild and efficient grafting. The resulting composite magnetic nanoparticles can achieve efficient separation of emulsified oily wastewater at room temperature and exhibit excellent recyclability, salt tolerance, and wide pH adaptability.

The invention belongs to the technical field of substance detection, and discloses a biomimetic nanomaterial coated with a cell membrane as well as a preparation method and application of the biomimetic nanomaterial. According to the invention, phospholipid functionalized magnetic nanoparticles are taken as a carrier, a cell membrane can be spontaneously integrated to the surface of the carrier by means of hydrophobic interaction, good binding capacity is achieved, and the obtained cell membrane-coated bionic nanomaterial is specifically alpha7nAChR-MNPs. According to the invention, a cell membrane for highly expressing an alpha7 nicotinic acetylcholine receptor is combined with phospholipid functionalized magnetic nanoparticles, so that alpha7nAChR-MNPs can specifically target potential risk substances, and the potential risk substances in a complex sample can be rapidly positioned and separated. The method is applied to food, potential risk substances can be predicted by simulating a biological recognition mechanism of a receptor, and the technical problems that a traditional screening method is insufficient in screening coverage degree, prone to causing misjudgment and missed judgment, high in cost and long in consumed time are solved.

The invention discloses a magnetic amide functionalized covalent organic framework material and a preparation method and application thereof, the preparation method comprises the following steps: S1, uniformly dispersing Fe3O4 nanoparticles and ammonia water, adding tetraethyl orthosilicate, and reacting; s2, a product obtained in the step S1 and 3-aminopropyltriethoxysilane are uniformly dispersed and subjected to a reaction, and aminated magnetic nanoparticles Fe3O4 (at) SiO2-NH2 are obtained; and S3, uniformly dispersing the Fe3O4 (at) SiO2-NH2 and trialdehyde phloroglucinol in a mixed solution of o-dichlorobenzene and N, N-dimethylformamide, adding 4, 4 '-diaminobenzanilide, uniformly mixing, then adding an acetic acid solution, and reacting at the temperature of 100-120 DEG C for 3-5 days to obtain the magnetic covalent organic framework Fe3O4 (at) Am-COFs material. The Fe3O4atAm-COFs prepared by the preparation method disclosed by the invention has a large specific surface area, rapid magnetic separation capability and abundant active sites, so that the adsorption performance of the material on a target object is effectively improved.