1246 results about "Magnetic nanoparticles" patented technology

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 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 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 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 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 belongs to the field of adsorption materials, and discloses a porous lignin fiber adsorption material and a production process thereof, the porous lignin fiber adsorption material comprises the following raw materials by weight: 40-60 parts of lignin fiber, 20-30 parts of bamboo fiber, 5-15 parts of chitosan, 5-10 parts of sodium bicarbonate, 5-10 parts of attapulgite, 5-10 parts of zeolite, and 2-5 parts of magnetic nanoparticles; the invention aims to provide the production process of the porous lignin fiber adsorption material, the problems that the existing lignin fiber adsorption material is poor in pore structure, limited in adsorption performance, difficult to separate and the like are solved through an innovative raw material formula and an optimized production process, efficient adsorption of light components in asphalt is realized, the stability of an asphalt mixture is enhanced, and the service life of the asphalt mixture is prolonged. Meanwhile, heavy metal ions, organic pollutants and the like are efficiently adsorbed and rapidly separated, the production energy consumption is reduced, and the environmental protection property and economical efficiency of the process are improved.

The invention discloses a ganoderma lucidum extraction method based on a reusable magnetic enzyme. The ganoderma lucidum extraction method comprises the following steps: S1, preparing a nanoscale amination modified Fe3O4-SiO2 magnetic composite carrier; s2, on the basis of the amination modified Fe3O4-SiO2 magnetic composite carrier, cellulase is added, and a magnetic immobilized enzyme buffer solution is obtained; s3, the ganoderma lucidum sporocarp is put into a magnetic immobilized enzyme buffer solution to be subjected to enzymolysis, extraction and filtration, effective components of ganoderma lucidum are obtained, and magnetic immobilized enzyme is recycled for repeated utilization; according to the method, the magnetic nanoparticles are modified, so that the surfaces of the magnetic nanoparticles have specific active groups, meanwhile, the magnetic response advantage of an inorganic magnetic material is reserved, the nanoscale amination-modified Fe3O4-SiO2 magnetic composite carrier is prepared, enzyme molecules can be directly anchored on the surfaces of the magnetic nanoparticles, and enzyme activity is improved. The immobilized enzyme can be conveniently recycled from a reaction system, so that the cost of an enzyme preparation can be reduced, and the enzyme activity stability can be improved.

The invention provides an intrinsic magnetic MXene material and a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing an aqueous solution of MXene with an alkaline reagent, and carrying out ultrasonic dispersion to obtain a mixed dispersion liquid; freezing the mixed dispersion liquid into a solid by liquid nitrogen; the alkaline reagent is potassium hydroxide or sodium hydroxide; s2, the obtained solid is subjected to freeze drying, and the Archimedes screw type MXene aerogel is obtained; s3, the Archimedes spiral type MXene aerogel is subjected to heat treatment under the protection of inert gas, and the intrinsic magnetic MXene material is obtained. The invention designs and develops a single-component pure MXene electromagnetic wave absorbing material on the premise of not introducing magnetic nanoparticles.

The invention relates to the field of catalyst separation, and discloses functional magnetic composite microspheres, a preparation method and application thereof, and a method for removing a noble metal catalyst from a hydrogenated butadiene-acrylonitrile rubber solution. The functional magnetic composite microsphere comprises magnetic nanoparticles and a SiO2 coating layer coating the surfaces of the magnetic nanoparticles, a functional group is grafted on the surface of the coating layer; on the basis of the weight of the functional magnetic composite microsphere, the content of the functional group is 0.01-5 mmol / g; the functional magnetic composite microsphere is used for removing a metal catalyst in a hydrogenated butadiene-acrylonitrile rubber solution. According to the functional magnetic composite microsphere, the noble metal catalyst in the hydrogenated butadiene-acrylonitrile rubber liquid is adsorbed, magnetic separation of the noble metal catalyst is achieved under the condition that the hydrogenated butadiene-acrylonitrile rubber liquid is not polluted, and the noble metal catalyst in the hydrogenated butadiene-acrylonitrile rubber liquid has a high removal rate.

The invention discloses a preparation method and application of an astragalus flavonoid extract with an effect of treating systemic lupus erythematosus, and belongs to the technical field of pharmaceutical preparations. The preparation method disclosed by the invention comprises the following steps: screening components for treating systemic lupus erythematosus target protein in astragalus membranaceus by adopting reverse network pharmacology; the preparation method comprises the following steps: preparing an astragalus flavonoid substance by adopting an ultrasonic-assisted deep eutectic solvent method, and extracting the astragalus flavonoid substance by using ethyl acetate to obtain an astragalus flavonoid ethyl acetate extract; preparing magnetic nanoparticles of which the surfaces are adsorbed with the target protein; and carrying out micromolecule fishing on the astragalus flavone ethyl acetate extract by adopting the magnetic nanoparticles, so as to obtain the astragalus flavone extract with the effect of treating systemic lupus erythematosus. The radix astragali flavonoid extract prepared by the invention has a higher curative effect on systemic lupus erythematosus, and has a better effect than the existing medicine under the same dosage.

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.

The invention discloses a magnetic nanoparticle concentration distribution inversion method and a related device, and relates to the technical field of biomedical engineering.The method comprises the steps that firstly, magnetic nanoparticles in biological tissue are excited through an external magnetic field to generate infinitesimal displacement; and then ultrasonic equipment is adopted to collect ultrasonic ultrafast plane wave imaging data and carry out axial vibration displacement detection, axial vibration displacement actual measurement data and corresponding discrete space and time coordinates are input into the inversion model for iterative inversion, and a magnetic nanoparticle concentration distribution inversion result is obtained. A loss function of the inversion model includes a data-driven loss item and a physical information-driven loss item (based on a Navie equation). Compared with the prior art, the method has the advantages that the physical information neural network is introduced, control equations such as a nano-dimension equation and the like are encoded to the full-connection neural network, physical equations do not need to be excessively simplified, complex and time-consuming modeling for an experimental environment is not needed to obtain simulation data, and higher accuracy and stability are achieved.

The invention relates to the field of demulsifiers, in particular to an oil sludge demulsifier as well as a preparation method and application thereof. The oil sludge demulsifier comprises the following components in parts by mass: 20-35 parts of a surface active compound, 7-12 parts of a sodium alkyl sulfate cosolvent, 0.6-1.8 parts of a stabilizer and 48-55 parts of water, wherein the surface active compound comprises hyperbranched polyamidoamine and polyether amine modified magnetic nanoparticles. According to the oil sludge demulsifier, the problems that most of existing demulsifiers are small in dehydration amount, low in dehydration speed, poor in demulsification effect and low in treated oil content are solved, the demulsification performance of the oil sludge demulsifier is improved, the demulsification and dehydration efficiency is improved, and effective separation of oil sludge is achieved.

The invention provides a magnetic polymer composite film and a preparation method and application thereof, and belongs to the technical field of friction materials. The magnetic polymer composite membrane comprises a P (VDF-TrFE) base membrane and a plurality of rod-shaped CoFe2O4 (RCFO) (at) PDA magnetic nano particles dispersed in the P (VDF-TrFE) base membrane, the RCFO (at) PDA magnetic nanoparticle has a core-shell structure, a core layer is rod-like nanometer CoFe2O4, and a shell layer is polydopamine. The RCFO nanoparticles with dielectric properties are embedded into the P (VDF-TrFE) base film, and a stripe-shaped surface microstructure is successfully constructed through a magnetic field orientation assisted thermal film forming process, so that the contact area of the friction material is effectively increased, and meanwhile, the dielectric constant is also improved. The magnetic polymer composite film provided by the invention is used as a positive electrode friction material of a friction nanometer generator, and the electric output performance of the friction nanometer generator is obviously improved.

The invention belongs to the technical field of nanoprobes, and particularly relates to a polymyxin B functionalized nanoprobe and a preparation method and application thereof.The nanoprobe comprises magnetic nanoparticles and long-afterglow nanoparticles, the surfaces of the magnetic nanoparticles and the long-afterglow nanoparticles are modified with polymyxin B respectively, and the polymyxin B functionalized nanoprobe is formed by modifying polymyxin B on the surfaces of the magnetic nanoparticles and the long-afterglow nanoparticles. The preparation method of the nanoprobe comprises a method for modifying long afterglow nanoparticles with polymyxin B and a method for modifying magnetic nanoparticles with polymyxin B. According to the nanoprobe disclosed by the invention, the magnetic nanoparticles with separation and enrichment effects and the long afterglow nanoparticles with afterglow luminescence and interference resistance are prepared on the basis of taking antibiotics as recognition molecules; through the enriched and separated magnetic nanoparticles and the long afterglow nanoparticles for providing signals, a new detection means is provided for rapid and quantitative background-free detection of gram-negative bacteria.

The invention provides eye protection liquid for improving eye microcirculation and a preparation method thereof, and belongs to the technical field of medical configuration products. The composition comprises the following components: surface-modified magnetic nanoparticles, a calendula extract, a fermented dogwood extract, xanthophyll, taurine, sodium hyaluronate, hydrolyzed sodium hyaluronate, soya bean lecithin, borneol and fermented vegetable oil. The efficiency of active ingredients is improved through a double-fermentation technology, magnetic targeting and multi-channel compounding are combined, and the preparation method has remarkable advantages in the field of improving periorbital microcirculation. The traditional Chinese medicine composition has an obvious relieving effect on asthenopia and dry skin around eyes; the components of the eye microcirculation eye protection liquid are mild, and adverse reactions such as allergy cannot be caused.