1428 results about "Magnetite Nanoparticles" patented technology

The invention provides a modified basalt fiber, a basalt fiber shielding material and a preparation method, and relates to the technical field of fiber composites.The modified basalt fiber comprises an activated basalt fiber, an adhesion layer and an electromagnetic shielding layer, and the surface of the activated basalt fiber is sequentially coated with the adhesion layer and the electromagnetic shielding layer; the adhesion layer comprises polydopamine; the electromagnetic shielding layer comprises magnetic Fe3O4 nano particles and a graphene nano sheet; the mass ratio of the activated basalt fibers to the polydopamine to the magnetic Fe3O4 nanoparticles to the graphene nanosheets is 1 to (0.4 to 0.5) to (0.6 to 1) to (0.1 to 0.25). According to the basalt fiber shielding material provided by the invention, the conductive particles and the magnetic particles are combined, and by optimizing the material components and proportion, a very good electromagnetic wave absorption and shielding effect can be achieved, a wider frequency band shielding effect can be provided, and electromagnetic radiation in various frequency ranges can be effectively covered.

The invention relates to the technical field of soil conditioners, and particularly discloses an intelligent controlled-release core-shell alginate soil conditioner and a preparation method thereof.The conditioner is of a core-shell-layer three-layer structure and comprises a core layer, a middle shell layer and an outer layer, the three layers account for 30%, 40% and 30% of the total weight respectively, and the core layer mainly comprises improved alginate and nutrients; the middle shell layer mainly comprises chitosan and a microbial preparation; and the outer layer mainly comprises modified charcoal and magnetic nano # imgabs0 #. The preparation method comprises the four steps of core layer preparation, middle shell layer coating, outer layer coating and forming post-treatment, and multiple functions of accurate nutrient supply, efficient heavy metal fixation and soil microenvironment regulation and control are achieved through a core-shell-layer three-layer structure design and a pH / temperature / microorganism triple response mechanism by adopting a coaxial electronic injection and layer-by-layer self-assembly technology; the fertilizer has a remarkable improvement effect on sandy soil and saline-alkali soil, and the organic matter increasing rate reaches 40%.

A carbon dioxide (CO2) stream reacts with an amine-modified magnetic nanoparticle in solution to form an amine-CO2 adduct. The solution that includes the amine-modified magnetic nanoparticle is heated by an external alternating magnetic field. The heat provided by the external alternating magnetic field is localized such that only the amine-CO2 adduct is heated to release the CO2, without heating the entire solution. This process helps with the capture and release of CO2 with a significantly reduced energy during the CO2 release step.

The invention discloses a nano system for tumor radioimmunotherapy and a preparation method and application thereof, and belongs to the technical field of biological medicines.The system modifies bacteria outer membrane vesicles (OMVs) through engineering to enable the bacteria outer membrane vesicles to carry magnetite nanoparticles (Fe3O4NPs) and an ATR inhibitor VE822, the Fenton reaction activity of the Fe3O4NPs and the synergistic effect of the ATR inhibitor for inhibiting DNA damage repair are utilized, and the tumor radioimmunotherapy effect is improved. DNA damage is amplified, DNA damage reaction (DDR) is inhibited, generation of hydroxyl radicals (. OH) under radiation is enhanced, radiation resistance of tumor cells is reduced, immune reaction is reactivated, infiltration of effector T cells to tumors is improved, growth of mice tumors is remarkably inhibited, and an effective strategy is provided for tumor radioimmunotherapy.

The invention relates to a double-color magnetic nanoparticle imaging method based on a single-harmonic system matrix, which comprises the following steps: respectively moving two different types of magnetic nanoparticle samples to a central zero magnetic field point, applying a scanning magnetic field to enable the zero magnetic field point to scan the whole imaging field of view, applying an excitation magnetic field to magnetize magnetic nanoparticles, and applying an excitation magnetic field to magnetize the magnetic nanoparticles; acquiring magnetization frequency spectrum signals of the two magnetic nanoparticle samples; the method comprises the following steps: constructing single harmonic system matrixes A1 and A2 based on single harmonic of magnetization spectrum signals of two kinds of magnetic nanoparticle samples; measuring a to-be-measured object formed by the two kinds of magnetic nanoparticles to obtain a measurement magnetization signal U; transversely splicing the single harmonic system matrixes A1 and A2 of the two different types of magnetic nanoparticles to obtain a new single harmonic system matrix A; the concentration distributions c1 and c2 of two different types of magnetic nanoparticles are obtained by combining a new single-harmonic system matrix A with a measurement magnetization signal U, and the concentration distributions of the two different types of magnetic nanoparticles are respectively sent into different color channels to be displayed in different colors. The method has important significance in promoting the application of the magnetic nanoparticle imaging technology in clinical medicine.

The invention relates to a kitchen waste oil recovery treatment method, which comprises: S1, carrying out multi-field synergistic pretreatment: sequentially carrying out ultrasonic wave and high-frequency pulse electric field treatment on waste oil to break an emulsion layer, adding magnetic nanoparticles to adsorb polar impurities, and carrying out magnetic field separation to obtain high-purity oil; s2, supercritical catalytic reaction: under the CO2 supercritical condition, using a core-shell structure composite catalyst to synchronously perform transesterification reaction and glycerol dehydration reaction; s3, dynamic membrane separation: separating biodiesel and glycerol in real time through an intelligent membrane assembly; s4, gradient utilization of energy: recovering reaction waste heat to drive membrane distillation to concentrate wastewater, and using tail gas CO2 for carbonation reaction to generate calcium carbonate. Through four core technologies of multi-field collaborative pretreatment, low-temperature supercritical catalysis, dynamic membrane separation and energy gradient utilization, triple limitations on efficiency, cost and environmental protection in the prior art are remarkably broken through.

The present invention relates to magnetic, catalytically active, and radiosensitizing nanoparticles (NanoXcats) and the method for their production. A method is disclosed for the production of functionalized greigite nanoparticles with a narrowband size distribution (10-30 nm) for use in multimodal cancer therapy. NanoXcats are superparamagnetic Fe3S4 nanoparticles whose surfaces are equipped with polar functional groups. The surface structures of NanoXcats are suitable for conjugation with, or for covalent or electrostatic binding of, active substances, which may be cancer drugs, cell growth inhibitors, or NO donors. Due to the EPR effect, NanoXcats are preferentially internalized by tumor cells. The targeted accumulation of NanoXcats in tumor tissue is achieved by an external inhomogeneous magnetic field. NanoXcats exhibit enhanced catalytic activity in tumor cells.The catalytic activity of intracellular NanoXcats can be triggered, controlled, and enhanced by low-dose X-rays. Surface-bound drugs are additionally activated in tumor cells by the catalytic activity of NanoXcats. NanoXcats act as superoxide dismutase, nitric oxide synthase, and Fenton catalyst. They catalyze, for example, reactions of the superoxide anion radical to hydrogen peroxide, of L-arginine to NO, and of hydrogen peroxide to the hydroxyl radical.

The invention belongs to the technical field of magnetic particle imaging, particularly relates to a magnetic particle imaging system and method based on a flexible receiving coil array, and aims to solve the problems that an existing rigid receiving coil is poor in biological surface adaptability and low in signal-to-noise ratio for micro geometric texture imaging. According to the structure, a receiving coil array adheres to the surface of an object to be measured, the receiving coil array and a compensation coil array are distributed on the two sides of a flexible substrate, the receiving coil array is used for receiving magnetic nanoparticle signals, and the partitioned small compensation coil array is used for conducting feed-through interference and electromagnetic interference compensation on a receiving coil; the reconstruction method comprises the following steps: sequentially carrying out Fourier transform on the collected receiving signals, extracting in-phase third harmonics and superposing to obtain processed signals, interpolating to construct a sinogram for Cartesian coordinate distribution, and reconstructing the three-dimensional particle concentration distribution of a measured object by a filtering back projection method. A flexible receiving coil array strategy is adopted, an adaptive reconstruction method is provided, and the imaging signal-to-noise ratio is improved.

The invention belongs to the technical field of magnetic nanoparticle imaging, particularly relates to an MPI magnetic particle imaging method and system for early detection of an AD patient, and aims to complete MPI time sequence imaging by using a diffusion model and solve the problem that the feature dimension of an input signal in the diffusion model is not matched with the resolution of an expected generated image. The method comprises the following steps: constructing a generative network model, and performing staged training; mPI time sequence one-dimensional signals are collected, and image reconstruction is carried out based on the generative network model to obtain MPI time sequence images; carrying out registration and dividing a brain region; and constructing a functional connection diagram and a functional connection matrix by using the RV coefficient, and drawing the brain network. According to the method, by constructing the Seq-VAE / Regression / Sig-LDM step-by-step network and performing staged training, free input of a signal sequence of a fixed feature dimension is realized, the image sequence reconstruction effect is improved, a default mode network is drawn based on the reconstructed image sequence, and accurate data is provided for subsequent application.

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 discloses functional injection type bionic hydrogel for promoting bone healing and a preparation method thereof, and relates to the technical field of medical instruments. The hydrogel has good functional characteristics, is a biomimetic material prepared on the basis of methacrylated gelatin, and aims to regulate and control the degradation rate, the drug release mechanism and diversified synergistic treatment and promote bone repair and regeneration; according to the hydrogel, matching of the degradation rate and the bone regeneration rate is achieved through reasonable matching, stem cell osteogenic differentiation and angiogenesis are promoted, ultrasonic controlled-release drug release and synergistic controlled-release of active factors are achieved, inflammation is reduced, and the bone repair process is promoted; the calcium phosphate bone cement provides biocompatibility and bone conductivity, and the nano clay releases active ions to improve the microenvironment and promote bone repair; in addition, the magnetic nanoparticles and a static magnetic field have synergistic interaction, the bone healing process is further accelerated, and treatment effect monitoring is enhanced through magnetic resonance imaging.

The invention belongs to the technical field of water treatment, and particularly relates to a preparation method and application of an organic / inorganic composite flocculant for swimming pool water treatment.The method comprises the steps that magnetic nanoparticles Fe3O4 and sodium silicate powder are mixed to prepare a magnetic polysilicic acid solution, chitosan and acrylamide of a certain mass are dissolved in a glacial acetic acid solution, and the magnetic polysilicic acid solution is prepared; and ammonium ceric nitrate is used as an initiator to prepare the chitosan-polyacrylamide flocculant. The prepared chitosan-polyacrylamide flocculant is stirred in a glacial acetic acid solution for 24 hours for pretreatment. The preparation method comprises the following steps: adding an Al2 (SO4) 3.18 H2O solution, a ZnSO4. 7H2O solution and a pretreated chitosan-polyacrylamide flocculating agent into a magnetic polysilicic acid solution according to a certain proportion, so as to prepare the Fe3O4-PSAZ-CS-AM composite flocculating agent. The method disclosed by the invention is simple in reaction operation, easy in reaction condition control, low in cost and high in turbidity removal and organic matter removal efficiency of the swimming pool water, and has relatively high popularization and application values.

The invention discloses a preparation method of a wool-based nitrogen-doped magnetic biochar material, which comprises the following steps: firstly, impregnating impurity-removed and scale-removed wool in a ferric chloride solution for coordination reaction to obtain a wool / iron complex; adding melamine, metal salt and the wool / iron complex into deionized water, sealing to form a closed environment, and then vibrating to uniformly disperse the metal salt and melamine on the surface of the wool; taking out and drying until no water exists to obtain a metal salt / melamine / wool mixture; carbonizing the mixture in an oxygen-free environment, and removing metal salt and impurities in the product; and drying to obtain the wool-based nitrogen-doped magnetic biochar material. The magnetic biochar material loaded with magnetic nanoparticles is prepared from wool, has excellent adsorption effect and adsorption catalysis effect on complex mixed dye liquor, achieves catalysis and adsorption synergistic integration, has superparamagnetism, and can realize solid-liquid separation and recovery by setting an external magnetic field.

The invention belongs to the technical field of magnetic particle imaging, and relates to a magnetic particle imaging method based on mixed-frequency magnetic field excitation, which comprises the following steps: acquiring a dotted magnetic nanoparticle sample and a to-be-imaged object, respectively applying a mixed-frequency excitation magnetic field in an imaging mode to the dotted magnetic nanoparticle sample and the to-be-imaged object, acquiring a mixed frequency magnetic field excitation-based system matrix and a mixed frequency domain magnetization response frequency spectrum signal; and inputting the system matrix and the mixed frequency domain magnetization response frequency spectrum signal into a concentration spatial distribution inversion model to perform concentration spatial distribution inversion of the magnetic nanoparticles, obtaining the concentration spatial distribution of the magnetic nanoparticles in the object to be imaged, and performing magnetic particle concentration distribution imaging. According to the invention, real-time high-resolution magnetic particle imaging can be realized.

The invention relates to a core-shell structure drug-loaded magnetic-thermal hydrogel microsphere for treating drug-resistant ovarian cancer and a preparation method thereof, belonging to the field of biological and medical micro-nano materials and technologies, and the core-shell structure drug-loaded magnetic-thermal hydrogel microsphere is formed by combining an inner core and a shell layer through covalent crosslinking and electrostatic interaction. An anti-tumor drug cis-platinum and magnetic nanoparticles are loaded on an inner core, and an AZ191 inhibitor is loaded on a chitosan shell, so that preferential release of AZ191 is realized to inhibit a drug-resistant signal channel and reduce the drug resistance of cancer cells, and the cis-platinum is slowly released after the action is completed to kill tumor cells. And the magnetic nanoparticles in the inner core can be heated under an external magnetic field, so that multifunctional synergistic treatment of magnetic hyperthermia, drug resistance inhibition and chemotherapy is realized. Chitosan and sodium alginate are biodegradable materials, so that the utilization rate of the embedded medicine can be increased, and meanwhile, the medicine can be metabolized out of a body. The preparation method does not relate to toxic cross-linking agents and organic solvents, and the prepared hydrogel core-shell microspheres have no biotoxicity. Complicated operation steps are not needed, the technological process is simple, the preparation period is short, and the application range is wide.

The invention relates to the technical field of material preparation, and discloses a magnetic basalt fiber reinforced wear-resistant self-lubricating coating and a preparation method thereof, and a coating and a preparation method thereof, and the preparation method comprises the following steps: step 1, treating short-cut basalt fibers with an acid and / or alkali solution, mixing with an iron salt solution to obtain a reaction solution, carrying out hydrothermal reaction to obtain the magnetic basalt fiber loaded by the magnetic nanoparticles; step 2, adding a filler into the resin matrix solution, dispersing, and grinding to obtain resin slurry; and 3, adding the magnetic basalt fiber in the step 1 into the resin slurry in the step 2, adding a curing agent, and uniformly mixing to obtain the required coating. According to the method, the contact behavior and the abrasion mechanism of a friction pair are optimized, the friction coefficient and the abrasion rate are reduced, the tribological performance of the obtained coating is improved, the service life of a mechanical kinematic pair is prolonged, and the reliability and the stability of equipment operation are improved.

The invention discloses an optical microscopy method, system and device for positioning magnetic nanoparticles, and the method comprises the steps: obtaining an interference pattern generated when laser passes through a to-be-detected sample, and distributing the magnetic nanoparticles in the to-be-detected sample; the interference pattern is formed by interference of incident laser and scattered light of the magnetic nanoparticles; determining a distribution function of the interference pattern, and determining the central position of the magnetic nanoparticle according to the interference pattern and the distribution function; the device comprises a laser, an amplification objective lens, a focusing lens, an imaging unit and a processor, light emitted by the laser passes through a to-be-detected sample to generate an interference pattern, the interference pattern is amplified by the amplification objective lens and focused by the focusing lens to be imaged in the imaging unit, and magnetic nanoparticles are distributed in the to-be-detected sample. According to the embodiment of the invention, micron-sized space positioning of the magnetic nanoparticles can be realized, and the method can be widely applied to the technical field of optical positioning.

The invention relates to the technical field of composite material preparation, in particular to high-mechanical-property granular hydrogel and a preparation method and application thereof.The high-mechanical-property granular hydrogel is prepared by mixing gelatin nano-particles, calcium carbonate nano-particles, ferric oxide nano-particles and a sodium alginate solution under the alkaline condition, then adding gluconic acid-delta-lactone, and conducting stirring, standing and drying to obtain the high-mechanical-property granular hydrogel. Particle hydrogel with high mechanical property is prepared and is simply recorded as Ca-Alg / MCG, and the gel system is endowed with the catheter injectable property, the blood vessel deliverable property and the intravascular hardenability property. The hydrogel can be delivered to small blood vessels of tumors, the mechanical property can be gradually enhanced along with the change of time, and the embolism effect of the granular hydrogel in the blood vessels is further improved. Meanwhile, the magnetic nanoparticles endow the hydrogel with the magnetic-thermal response capability, the temperature can be rapidly increased under an alternating magnetic field, tumor cells are further killed, and the hydrogel shows an excellent embolism effect in a rabbit kidney embolism model and a liver cancer rabbit embolism model.

Described herein are compositions, systems, and methods for targeted and controlled drug release. In some embodiments, the compositions, systems, and methods may comprise magnetoelectric silica nanoparticles for targeted and controlled release of chemotherapeutic drugs for cancer treatment. In some embodiments, an external magnetic field may be used to release one or more drugs from the magnetoelectric silica nanoparticles. The disclosed compositions, systems, and methods may improve drug targeting and reduce systemic drug toxicity.

The invention relates to the technical field of microbial fertilizers, in particular to a microbial fertilizer for improving a soil structure and a preparation method thereof, and the microbial fertilizer comprises the following components: microbial flora, a charcoal-based composite material, magnetic nanoparticles, a polymer water retention agent, a soil enzyme activator, peanut bran, molasses and a trace element supplement. By selecting and proportioning functional components such as various microbial florae, biochar-based composite materials, magnetic nanoparticles and the like, the invention aims to construct the microbial fertilizer with efficient nutrient utilization, excellent soil structure improvement capability and environmental adaptability, not only the instant effect of the fertilizer is concerned, but also the long-term benefit and ecological sustainability of the fertilizer are concerned, and the application prospect is wide. Powerful support is provided for green development of modern agriculture.

The invention discloses a rapid and accurate detection method for pathogenic bacteria. The method comprises the following steps: immobilizing bacteriophages on the surfaces of magnetic nanoparticles through physical adsorption or chemical reaction, selectively enriching pathogenic bacteria in a complex sample by adopting the bacteriophage functionalized magnetic nanoparticles, quickly cracking the pathogenic bacteria on the surfaces of the magnetic nanoparticles by using CTAB (cetyltrimethyl ammonium bromide), releasing ATP in the bacteria, and quantitatively analyzing ATP by using bioluminescence. Further calculating the content of the pathogenic bacteria; the detection method is free of enrichment and amplification, can complete capture, enrichment and detection of pathogenic bacteria within 20 minutes, and can specifically detect viable bacteria of target bacteria in various complex matrix (such as food) samples due to the fact that bacteriophages are adopted as recognition molecules.

The invention discloses pancreatic lipase immobilized composite nano magnetic beads, a preparation method and application, ferroferric oxide is adopted as a magnetic core, dopamine-mediated growth is performed to form a core-shell structure, then the periphery of the core-shell structure is wrapped with a metal organic framework to form the composite nano magnetic beads, and pancreatic lipase is immobilized by using the composite nano magnetic beads as an adsorption carrier. The enzyme loading amount, the repeated utilization rate and the storage stability of the ferroferric oxide nano-particles are remarkably improved, the enzyme immobilization efficiency and the enzyme activity are improved, and meanwhile, the prepared pancreatic lipase immobilized composite nano-magnetic beads have excellent stability and biocompatibility, are green and pollution-free and can be repeatedly used; the composite nano magnetic beads are synthesized by adopting a solvothermal method, the product is easy to separate, the synthesis process is simple, the enzyme immobilization efficiency can be regulated and controlled by regulating and controlling the synthesis process, the structure of an active ligand can be screened and analyzed from natural products with numerous and jumbled components, and the active ligand has a certain lipid-lowering potential and can be used for preparing the nano magnetic beads. The compound can be used as a potential lead compound of lipid-lowering drugs.

The invention belongs to the technical field of magnetic particle imaging, particularly relates to a time sequence magnetic nanoparticle imaging device and method for detecting nerve response activity, and aims to solve the problems that the sensitivity of magnetic particle signal detection is not high, a large coil assembly is needed for achieving high magnetic field intensity, the calculation amount is large, and the calculation mode is complex. According to the device, a signal generator outputs a voltage signal, amplifies the voltage signal and then accesses a selection coil and a driving coil; the two selection coils are arranged in a Maxwell configuration and have the same axis; the driving coils are arranged at intervals of 90 degrees from top to bottom, from left to right and from front to back by taking the FFR as the center; the excitation coil, the receiving coil and the selection coil are coaxial; and the high-pass filter filters the signal received by the receiving coil and imports the signal into a computer through a signal acquisition card for time sequence fMPI image sequence reconstruction. According to the invention, the magnetic particle signal detection sensitivity is improved, the volume of the coil assembly is reduced, the calculation complexity and the calculation amount are simplified, and the magnetic particle imaging robustness is improved.

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 belongs to the technical field of gram-positive bacterium detection, and particularly relates to a nano-probe for detecting gram-positive bacteria and a preparation method, a detection method and application of the nano-probe for detecting the gram-positive bacteria, and the nano-probe for detecting the gram-positive bacteria comprises concanavalin A modified magnetic nanoparticles and vancomycin modified long afterglow nanoparticles, the magnetic nanoparticles comprise FeCl3, the long afterglow nanoparticles comprise ZnGa2O4: Cr, and the preparation method comprises a preparation method of the concanavalin A modified magnetic nanoparticles and a preparation method of the vancomycin modified long afterglow nanoparticles. The nano-probe provided by the invention has the functions of recognition, separation and enrichment, interference resistance and signal providing in the detection of gram-positive bacteria, and provides a new detection means for the recognition and detection of gram-positive bacteria.

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.

The invention discloses a preparation method of a demulsifier for oil-water separation of full fermentation broth, and relates to the technical field of demulsifier preparation.The preparation method comprises the steps of magnetic nanoparticle preparation, nanoparticle coating and demulsifier preparation.The preparation method has the advantages that salt is dissolved in a three-neck flask, nitrogen is introduced to discharge oxygen in the solution, and the demulsifier is obtained; according to the preparation method, the magnetic nanoparticles are added into the mixture A, so that the generated nanoparticles can be prevented from being oxidized, the mixture A is added in the process of adding the potassium nitrate and the 2-methylimidazole, and the polydopamine in the mixture A has good adhesion and biocompatibility, so that a'bridge '-like connection effect can be achieved between the magnetic nanoparticles and a subsequently generated nanoparticle coated sample; and polyvinylpyrrolidone can be used as a dispersant to prevent agglomeration of generated nano particle coated sample particles, and polar groups on molecular chains of polyvinylpyrrolidone can generate certain interaction with raw materials in a reaction system to optimize the growth process of the nano particle coated sample.

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 provides a preparation method and application of a magnetic biochar adsorption material, and relates to the technical field of biochar adsorption materials. The adsorption material is prepared by taking three kinds of biomass including municipal sludge, straw and antimony ore waste residues as biochar sources and further loading magnetic nano gamma-Fe2O3 particles. In the process, by controlling the mass of the municipal sludge, the straw and the antimony ore waste residues, the composition and performance of the biochar base material in the adsorption material can be regulated and controlled, rich active sites in the sludge and the straw are fully utilized, loading of the magnetic nano gamma-Fe2O3 particles is achieved, and the adsorption efficiency is improved. A microfibril structure in the straw and a high-activity mesoporous carrier in the antimony ore waste residue not only can improve the load rate of the magnetic nano gamma-Fe2O3 particles to a certain extent, but also can be beneficial to diffusion and capture of heavy metal ions in the application process, so that the adsorption rate of the material to the heavy metal ions is improved on the whole.