177 results about "Fe3o4 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 discloses a flexible heat-conducting composite material with chain-shaped boron nitride and a preparation method, and belongs to the technical field of flexible electronic device heat management materials, the flexible heat-conducting composite material comprises an elastomer matrix and a magnetic functionalized boron nitride filler filled in the elastomer matrix; the elastomer matrix is polydimethylsiloxane; the magnetic functionalized boron nitride filler is prepared by modifying Fe3O4 nanoparticles on the surface of a boron nitride sheet; the boron nitride sheets form a vertically arranged chain structure in the elastomer matrix. The chained vertical arrangement of the boron nitride sheets is realized by prolonging the magnetic field treatment time, the Fe3O4 modification quantity is controlled to optimize the balance between the magnetic responsiveness and the heat-conducting property, a chained heat-conducting network connected end to end is formed, and the thermal seepage threshold value is reduced. According to the flexible composite material and the preparation method thereof, boron nitride sheets are induced to be vertically arranged through a magnetic field to form a chain-shaped heat-conducting network, so that high heat conductivity under low filler loading capacity is realized, and excellent stretchability is kept at the same time.

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

The application relates to a method for one-step synthesis of strong magnetic hydrophobic Fe3O4 nanoparticles at low temperature and the Fe3O4 nanoparticles and application, and belongs to the technical field of nano material preparation. The method comprises the following steps: adding a ferrous sulfate solution into a mixed solution of sodium hydroxide and sodium nitrate, heating and stirring to react, adding oleic acid in the reaction process, and obtaining black Fe3O4 crystals after the reaction is completed. The saturation magnetization of the obtained strong magnetic hydrophobic Fe3O4 nanoparticles can reach 85.69 emu / g at most, and the water contact angle can reach 148.95 DEG. The one-step synthesis reaction only needs to use oleic acid as a regulator, avoids an extreme high-temperature and high-pressure environment, does not need to use a toxic chemical solvent, the condition is mild, the process is simple, the operation condition is easy to control, and the method has a wide application prospect.

The invention belongs to the technical field of biomedical materials, and discloses pH-responsive injectable hydrogel as well as a preparation method and application thereof. Comprising the following steps: (1) dissolving sodium alginate in water to form a uniform solution; (2) adding a fat-soluble small molecule drug and Fe3O4 nanoparticles into the solution, carrying out high-speed shearing dispersion under an ice-water bath condition to form a drug / nano composite system, and standing; and (3) sequentially adding a calcium carbonate suspension and glucolactone into the drug / nano composite system, uniformly stirring, and incubating until the mixture is completely cured to obtain the pH-responsive injectable hydrogel. The hydrogel obtained by the invention not only has excellent injectability and pH response release performance, but also can remarkably improve the loading efficiency of fat-soluble drugs, and provides a new technical approach for realizing local anti-tumor treatment.

The invention relates to the technical field of biological medicine, in particular to a diagnosis and treatment integrated brain-targeted magnetic particle imaging tracer and a preparation method and application thereof. The preparation method comprises the following steps: loading tetrahydrocurcumin into glucan by adopting a nano-particle self-assembly technology to form glucan nano-particles loaded with tetrahydrocurcumin, synthesizing Fe3O4 nano-particles by adopting a chemical precipitation method, and embedding the Fe3O4 nano-particles on the glucan nano-particles to obtain the diagnosis and treatment integrated brain-targeted magnetic particle imaging tracer agent. The nano-particles are marked as THC (at) Dex-Fe3O4 nano-particles. The THC-Dex-Fe3O4 nanoparticles play a role in treating the Alzheimer's disease during brain imaging diagnosis, and the technical problems that magnetic particle imaging cannot be applied to diagnosis of the Alzheimer's disease and the Alzheimer's disease is difficult to treat are solved.

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and relates to a preparation method of an Ag-Fe3O4 composite SERS substrate and application of the Ag-Fe3O4 composite SERS substrate in monitoring trace pollutants in water. Based on a plasma-semiconductor synergistic enhancement mechanism, cubic Fe3O4 nano particles with exposed {100} crystal faces are synthesized through a hydrothermal method, and the cubic Fe3O4 nano particles and Ag nano particles are subjected to ultrasonic-stirring to construct the Schottky heterojunction. The substrate creatively realizes dual-channel enhancement: the local surface plasmon resonance effect of Ag nanoparticles generates electromagnetic enhancement, the narrow band gap of Fe3O4 promotes photo-induced electrons to be transferred to Ag, an interface electric field is formed, and the polarizability of adsorption molecules is remarkably increased. When the probe is applied to detection of trace pollutants in a water body, the probe molecule RB is anchored on the surface of Fe3O4 through carboxyl, and the HOMO energy level of the probe molecule RB and the valence band top of Fe3O4 generate resonance charge transfer, so that the Raman cross section is improved. The detection limit of RB under 0.25 mW laser is increased by several orders of magnitude compared with that of a single Ag substrate.

The invention relates to the technical field of oil gas well tracing monitoring, in particular to a preparation method and application of an oil gas well tracing monitoring magnetic nano tracer agent. Comprising the following steps: dissolving FeCl3, FeSO4. 7H2O and doped metal salt in water, and introducing N2 to remove oxygen; the initial reaction temperature is 85 DEG C, rapidly adding ammonia water, reacting to generate Fe3O4 nanoparticles, doping elements, reducing the temperature to 60 DEG C, and firstly adding sodium citrate for primary carboxyl modification; adding a mixed solution of oleic acid and PEG twice; the pH value of the reaction system is controlled to be 9.5-10.5 in the whole process. The method has the beneficial effects that the doping amount is remarkably increased, the doping amount of doped elements is multiple times of that in the prior art, and the detection sensitivity is remarkably improved; in addition, oleic acid / PEG composite modification is adopted instead of single citric acid modification, so that the tracer is kept stably dispersed in high-salinity formation water; the superparamagnetism facilitates magnetic separation and recovery, and is suitable for harsh formation conditions.

The invention discloses a magnetic-aptamer targeting tumor tissue nano-drug delivery system as well as a preparation method and application thereof, and belongs to the field of medicines. The system comprises a mesoporous ferroferric oxide magnetic core, a polyethyleneimine (PEI) layer coated outside the mesoporous ferroferric oxide magnetic core and an aptamer adsorbed outside the PEI layer, and an autophagy activator can be selectively loaded in the mesoporous core. The preparation method comprises the following steps: sequentially carrying out drug loading, PEI coating and aptamer modification on the mesoporous Fe3O4 nanoparticles. According to the invention, efficient enrichment and endocytosis of tumor tissues are realized through dual effects of magnetic targeting and active targeting of the aptamer; lysosome escape is promoted by using the proton sponge effect of PEI; finally, by virtue of the synergistic effect of iron ions released by degradation of the Fe3O4 nanoparticles and endogenous iron ions released by ferritin autophagy induced by an autophagy activator, ferroptosis of tumor cells is induced through enhanced Fenton-like reaction, so that high-efficiency and low-toxicity targeted therapy is realized.

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

This invention belongs to the field of tertiary oil recovery technology, specifically relating to a CO2-switched magnetically driven nanoparticle, its preparation method, and its application. The magnetically driven nanoparticles are silica-coated Fe3O4 nanoparticles. The surface of the silica coating is further modified with amidine groups to act as CO2 switches. These CO2 switches cause the hydrophilicity of the magnetically driven nanoparticles to increase with the increase of CO2 solubility in the solution in which they are located. This invention integrates emulsification and demulsification functions through the CO2 switch loaded on the surface of the magnetically driven nanoparticles. Furthermore, the particles can be recycled using their own magnetic response, reducing costs. This nano-displacement agent can solve the problems of poor efficiency, ineffective oil-water separation, high economic costs, and environmental impact associated with existing displacement agents.

The invention discloses an anti-biofilm nano composite material added with resveratrol and a preparation method of the anti-biofilm nano composite material. According to the method, ferric trichloride hexahydrate, trisodium citrate, sodium acetate, polyetherimide, resveratrol and hyaluronic acid are used as raw materials, modified magnetic Fe3O4 nanoparticles with positive charges are prepared through a hydrothermal method, carbon dots derived from a resveratrol and hyaluronic acid mixture are introduced, and the magnetic Fe3O4 nanoparticles with positive charges are prepared. The anti-biofilm nano composite material added with the resveratrol is prepared. The nano composite material disclosed by the invention can be attached to a biological membrane, so that the loss is reduced in a transfer process, the effective utilization rate of a medicine is remarkably improved, and excellent magnetic property, antibacterial property and biological membrane resistance are shown.

The invention relates to a construction method and application of a ternary composite photocatalyst, and the construction method comprises the following steps: step 1, synthesizing Bi2MoO6: taking Bi (NO3) 3.5 H2O and Na2MoO4. 2H2O as precursors, reacting for 12 hours at 180 DEG C by adopting a hydrothermal method, and centrifugally washing and drying to obtain Bi2MoO6 powder; step 2, loading Fe3O4 nanoparticles on the surface of Bi2MoO6 to form a composite core-shell structure: mixing FeCl3. 6H2O, FeCl2. 4H2O and the Bi2MoO6 powder obtained in the step 1, heating to 80 DEG C under the protection of nitrogen, adding a NaOH solution to adjust the pH value to 10, and reacting for 1 hour to form a Fe3O4 / Bi2MoO6 core-shell structure composite material; step 3, anchoring Ag nano-particles: dispersing the Fe3O4 / Bi2MoO6 composite material obtained in the step 2 in water, adding an AgNO3 solution, stirring in a dark place, and then anchoring Ag nano-particles on a xenon lamp (lambda gt; and reducing Ag < + > into Ag0 under the irradiation of SiO2 / Bi2MoO6, thereby obtaining the Fe3O4 / Bi2MoO6 / Ag composite photocatalyst. The Fe3O4 / Bi2MoO6 / Ag composite photocatalyst is a novel Fe3O4 / Bi2MoO6 / Ag composite photocatalyst, light absorption is enhanced through plasma resonance, carrier separation is promoted through heterojunction, magnetic recovery of Fe3O4 is achieved, and the bottleneck is solved.

The application relates to the technical field of photocatalysts, in particular to a Fe3O4 / P / CuO x Nano-array composite photocatalyst, preparation method and application thereof. The preparation method is as follows: S1, a copper base material with CuO x nano-arrays is prepared; S2, the copper base material obtained in step S1 is immersed in a protective layer growth solution, the base material is taken out after reaction, and then washed and dried; the protective layer growth solution is prepared from one or more of dopamine mixed solution, tannic acid mixed solution and tea polyphenol mixed solution; S3, the base material obtained in step S2 is immersed in Fe3O4 nanoparticle dispersion liquid for a period of time, and then washed and dried after being taken out, so that the composite photocatalyst is prepared. Under visible light irradiation, the adsorption rate of the application to Cr(VI) reaches more than 98%, the proportion of elemental Cr in the reduction product is more than 60%, and the decomposition rate of the antibiotic reaches more than 99%.

The application belongs to the technical field of medicine preparation, and particularly relates to a magnetic layered double hydroxide, a targeted drug-loaded nano preparation, a preparation method and application of a tumor-targeted drug-loaded nano preparation. The preparation method of the magnetic layered double hydroxide provided by the application can prepare Fe3O4 nanoparticles with small particle size, and further prepare the magnetic layered double hydroxide which can be used as a water-soluble drug carrier. The magnetic layered double hydroxide is used for preparing the targeted drug-loaded nano preparation and the tumor-targeted drug-loaded nano preparation, and can be used for delivering water-soluble drugs such as 5-fluorouracil. The tumor-targeted drug-loaded nano preparation has good dispersity and can be actively targeted to HepG2 cells with high FR expression, has a good inhibitory effect on liver cancer cells, and is expected to provide a potential new treatment system for magnetic chemotherapy.

The invention discloses a three-dimensional network structure magnetic fiber carrier reinforced micro-plastic magnetic separation removal method, which is characterized in that Fe3O4 nanoparticles are selectively precipitated among sepiolite fiber bundle layers by controlling a coprecipitation process, and a wedging effect is generated to realize controllable stripping of fiber bundles, so that a three-dimensional network structure magnetic carrier is formed; a mechanical interlocking structure is formed on the surface of the flexible fiber and the micro-plastic, and the pH of a water body is self-adaptively regulated and controlled through the amphoteric ionization characteristic of silicon hydroxyl; enabling the magnetic aggregate suspension to sequentially pass through a multi-stage gradient magnetic field consisting of a pre-magnetization field, a main separation field and a fine scavenging field, and controlling the flow rate to enable the aggregate to form a stable filter cake layer on the surface of a magnetism gathering medium, so as to realize efficient separation of the micro-plastic; and the magnetic gathering medium capturing the aggregate is subjected to heat treatment, so that the micro-plastic is thermally decomposed, the magnetic carrier is directly recycled, the magnetic performance is improved, and regeneration reinforcement is realized. The micro-plastic removal rate reaches 99% or above, the performance is stable after multiple cycles, and the method is suitable for treating various micro-plastic-containing water bodies.

This invention relates to a high-temperature resistant industrial coating and its preparation method. The method includes: amylating Fe3O4 nanoparticles; grafting the amylated Fe3O4 nanoparticles with polybenzimidazole to obtain PBI-g-Fe3O4 composite particles; in-situ growing MOF to form polyMOF; and surface modification with a hydrophilic silane coupling agent to obtain a hydrophilic modified polyMOF; simultaneously, co-grafting silica nanoparticles with an aminosilane coupling agent and a long-chain alkylsilane coupling agent to obtain a synergist; finally, dispersing all components in an aqueous polyester resin varnish to prepare a composite coating. This invention achieves stable dispersion and strong interfacial bonding of polyMOF in aqueous polyester through a multi-level chemical bonding structure. The synergist synergistically provides curing and defoaming effects. The resulting coating exhibits grade 0 adhesion, excellent defoaming performance, a pencil hardness of 3H, and a temperature resistance limit of 640℃, showing broad application prospects in the field of high-temperature protection.

The application discloses a recyclable Fe3O4 polymer nanocomposite pour point depressant, a preparation method and application thereof, and belongs to the technical field of crude oil pour point and viscosity reduction. The preparation method of the Fe3O4 polymer nanocomposite pour point depressant comprises the following steps: (1) preparing hydrophobic Fe3O4 nanoparticles by using a coprecipitation method; (2) performing a free radical polymerization reaction on the hydrophobic Fe3O4 nanoparticles and grafting materials to obtain polymer-modified magnetic nanoparticles; and (3) dispersing the polymer-modified magnetic nanoparticles and ethylene-vinyl acetate copolymer in an organic solvent to obtain the Fe3O4 polymer nanocomposite pour point depressant. The prepared composite pour point depressant can effectively improve the low-temperature fluidity of crude oil, can be recycled, and reduces the refining cost of crude oil and the preparation cost of the reagent.

The invention discloses a magnetic enzyme carrier for water pollution control and a preparation method thereof. The carrier adopts a core-shell structure design, Fe3O4 nanoparticles are used as a magnetic core, and after functional coating of 3-aminopropyltriethoxysilane, laccase, peroxidase and other environmental governance enzymes are immobilized on the surface of the carrier through glutaraldehyde crosslinking. The carrier has excellent magnetic response performance. The preparation method adopts a three-step process of chemical coprecipitation, silanization and enzyme immobilization, and is mild in condition, simple and convenient to operate, low in cost and easy for industrial production. The method has the advantages that the method is simple, the method is applicable to removal of organic pollutants such as phenols, anilines and dyes during water pollution treatment, the treatment cost is lower than that of free enzymes, the method has remarkable environmental benefits and economic values, and important technical support is provided for industrial application of enzymatic water treatment technologies.

The application discloses a kind of peroxidase-like CDs@Fe3O4 nanoparticles and its preparation and application, which comprises: carbon source and nitrogen source are reacted by hydrothermal method, and nitrogen-doped carbon dot solution is prepared;Iron source is added to the nitrogen-doped carbon dot solution and stirred, after reaction at 150-300 DEG C, after separation, washing and drying, the peroxidase-like CDs@Fe3O4 nanoparticles are obtained.The CDs@Fe3O4 prepared by the application can catalyze hydrogen peroxide decomposition to produce hydroxyl radical to induce color change of chromogenic substrate, and Fe 3+ The linear response to chromogenic substrate is realized, and the visual monitoring of the damage depth of the protective layer of metal parts is realized.In the monitoring process, after the protective layer is slightly damaged, the CDs@Fe3O4 is exposed to make the chromogenic substrate develop color, and finally the protective layer is completely damaged to expose the metal, which can also induce the chromogenic substrate to develop color.At the same time, the application provides a convenient colorimetric method for detecting coating damage and metal corrosion using Python program.The method uses color difference as an index, and provides a simple and effective method for evaluating the degree of coating damage and metal corrosion.

The embodiment of the invention provides a preparation method of a wave-absorbing and heat-dissipating film and the wave-absorbing and heat-dissipating film. The preparation method comprises the following steps: carrying out amination modification on Ti < 3 > C < 2 > T < x > powder to obtain NH < 2 >-Ti < 3 > C < 2 > T < x > powder; the preparation method comprises the following steps: carrying out carboxylation modification on the Fe3O4 nano particles to obtain the Fe3O4-COOH particles. And mixing the NH2-Ti3C2Tx powder with the Fe3O4-COOH particles, and carrying out an amidation condensation reaction, so as to obtain the Ti3C2Tx-Fe3O4 complex. The preparation method comprises the following steps: dissolving polyvinyl butyral in ethanol, and stirring and mixing to obtain a precursor solution; adding the Ti3C2Tx-Fe3O4 complex and hexagonal boron nitride powder into the precursor solution, and stirring and dispersing to obtain a composite glue solution; and coating a substrate with the composite glue solution, drying, curing, and stripping from the substrate to obtain the wave-absorbing and heat-dissipating film. Multiple interfaces exist between Ti3C2Tx-Fe3O4 and h-BN, electromagnetic waves are reflected and scattered for multiple times between the interfaces with different dielectric constants, and the electromagnetic waves are fully lost. H-BN cooperates with Ti3C2Tx-Fe3O4 to jointly form a stable heat conduction channel, so that heat is rapidly conducted to the surface of the wave-absorbing heat dissipation film from a heat source and dissipated, and the situation of local overheating is reduced.

The application discloses a preparation method of an antibiotic selective adsorbent, first, C-BN nanosheet balls are prepared by a simple catalytic thermal evaporation method; second, the C-BN nanosheet balls are used as a main body to limit and load magnetic Fe3O4 nanoparticles; and then mesoporous SiO2 and imprinted polymers are coated on the surface of the C-BN nanosheet balls in sequence, and the tetracycline antibiotic selective adsorbent is obtained after template molecules are eluted. The tetracycline antibiotic selective composite adsorbent with high adsorption capacity is prepared, the high specific surface area of the carrier material and the enrichment antibiotic capacity of the radial structure and the selectivity of the surface molecular imprinting material are fully utilized, the selective adsorption of specific antibiotics in a complex solution is effectively realized, and the adsorption efficiency is effectively improved. The carbon-doped BN and the limited loading magnetic particles enhance the adsorption capacity, and the adsorbent can be quickly recovered and separated under an external magnetic field. Meanwhile, the SiO2 layer and the imprinted polymers enable the antibiotics to be quickly desorbed, and the cycle number is more, so that the antibiotic selective adsorbent has application prospects in the fields of sewage treatment and food antibiotic detection.

The invention discloses chitosan / beta-sodium glycerophosphate magnetic response temperature-sensitive hydrogel loaded with Fe3O4 particles and a preparation method of the chitosan / beta-sodium glycerophosphate magnetic response temperature-sensitive hydrogel. The hydrogel is obtained by taking a chitosan / beta-sodium glycerophosphate temperature-sensitive gel system as a carrier and loading Fe3O4 particles. Specifically, by controlling the concentration of Fe3O4, the ratio of sodium glycerophosphate powder to a Fe3O4 nano aqueous dispersion, the ratio of a chitosan solution to an iron-containing beta-glycerophosphoric acid aqueous solution and the acidity of a gelling microenvironment, the distribution of magnetic nanoparticles in a gel matrix is adjusted, and the magnetic nanoparticles which are in an injectable liquid state at room temperature and can be uniformly dispersed in a gel matrix are formed. The hydrogel can be rapidly cured into gel in a body temperature environment, and has a three-dimensional network structure for fixing high-load FeO nanoparticles. The hydrogel Fe8000 S < 1.5 > C28.3-A < 1.1 > and the hydrogel Fe8000 S < 1.5 > C46.7-A < 1.1 > which are prepared from the high-viscosity chitosan can be heated to 28 DEG C at the room temperature, and the magnetic heating performance is excellent.

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.

The invention belongs to the technical field of electromagnetic wave absorbing materials, and relates to a preparation method of a wave absorbing material MXene / Fe3O4 film, which comprises the following steps: 1, adding MAX and LiF into a hydrochloric acid solution for in-situ etching to generate few layers of MXene; 2, adding citric acid and urea into an N, N-dimethylformamide solution, mixing, and carrying out a hydrothermal reaction; 3, centrifuging the obtained product, and freeze-drying to obtain carbon dots CDs; 4, adding FeCl3. 6H2O and CH3COONa into an ethylene glycol solution, mixing, and carrying out a hydrothermal reaction; 5, centrifuging the obtained product, and drying in vacuum to obtain Fe3O4 nanospheres; 6, carrying out solution mixing on the few layers of MXene, CDs and Fe3O4 nanospheres, and carrying out vacuum filtration; 7, carrying out vacuum drying on the film obtained by suction filtration, and annealing to obtain an MXene / Fe3O4 composite film; in the MXene-based composite film prepared by the invention, the Fe3O4 nanoparticles are randomly distributed on the sheet layer and the surface of the MXene, so that the impedance matching of the material can be improved, and a magnetic loss mechanism is introduced, so that the MXene-based composite film has excellent wave-absorbing performance.

The invention discloses a universal magnetic nano-enzyme probe for detecting bacteria and viruses, a preparation method, a reagent strip and application, the universal magnetic nano-enzyme probe comprises magnetic Fe3O4 nano-particles and multiple layers of cationic polymer strong positive electricity interlayers loaded on the surfaces of the magnetic Fe3O4 nano-particles, the magnetic Fe3O4 nano-particles serve as inner cores, and the magnetic Fe3O4 nano-particles serve as outer cores. A cationic polymer is used as a connecting layer to adsorb multi-layer small gold iridium alloy nanoparticles (Au (at) Ir), the surfaces of the multi-layer small gold iridium alloy nanoparticles are coupled with wheat germ agglutinin protein molecules, Fe3O4 nanoparticles provide magnetic response ability, and the multi-layer Au (at) Ir provides colorimetric signals, catalytic sites and binding sites. Wheat germ agglutinin (WGA) provides the ability of a label to capture pathogens in a broad spectrum, the Fe-DAu-Ir-WGA probe is combined with an LFA technology, colorimetric signal reading is carried out through ImageJ software, and efficient and ultra-sensitive quantitative detection of multiple pathogens is achieved.

The invention discloses a molecular imprinting separation method for gallic acid in tara enzymolysis tannic acid waste liquid. The molecular imprinting separation method comprises the following steps: (1) preparing Fe3O4 nanoparticles; (2) preparing Fe3O4 (at) SiO2 nano particles; (3) preparing Fe3O4 (at) SiO2 (at) NH2 nano particles; (4) preparing a Fe3O4 (at) SiO2 (at) NH2 molecularly imprinted polymer; (5) pretreatment of waste liquid; and (6) gallic acid separation. The method has obvious advantages in the aspects of operation convenience, separation selectivity and repeatability, and an efficient and feasible technical scheme is provided for the field of natural product extraction.

This invention relates to the field of protein extraction technology, and in particular to a highly efficient method for extracting and preserving natural BICC1 protein from serum, comprising the following steps: 1) preparation of aminated magnetic Fe3O4 nanoparticles; 2) preparation of Fe3O4@Au nanoparticles; 3) preparation of BICC1 template protein; 4) binding of BICC1 template protein; 5) immobilization of BICC1 template protein; 6) elution of BICC1 template protein to prepare BICC1 magnetic molecularly imprinted polymer microspheres; 7) purification of natural BICC1 protein. This invention features a simple method with mild reaction conditions. The colloidal gold layer of the magnetic molecularly imprinted polymer achieves highly efficient adsorption of template molecules, and the outermost polymer immobilization layer, composed of neutral epoxy groups, reduces non-specific adsorption, enabling efficient and specific extraction of natural BICC1 protein directly from serum.

The invention relates to a preparation method of a nano-composite microbial agent for efficiently removing kitchen waste grease. Pseudomonas, alcaligenes, bacillus and candida which have high grease degradation capacity are screened out from grease polluted water and kitchen waste compost, and the proportion of the pseudomonas, the alcaligenes, the bacillus and the candida is optimized to form the efficient composite flora. The preparation method comprises the following steps: synthesis of the magnetic Fe3O4 nanoparticles, surface functionalization treatment and synthesis and immobilization of the complex microbial inoculant. The stable and efficient nano-composite microbial agent is prepared by combining the functionalized nano-particles with the composite flora. Experimental verification shows that the complex microbial inoculant shows excellent stability and degradation performance in the application of removing kitchen waste grease, and can be repeatedly used through a magnetic separation technology. Compared with a traditional method, the method has the advantages that the grease removal efficiency is improved, the treatment cost is reduced, and the method has a wide application prospect.

The application discloses a targeted magnetic nano-composite of palygorskite, a preparation method and application thereof in preparation of an in-vitro drug controlled release medicine. In the application, an anti-tumor drug DOX is loaded through an acid-cleavable acylhydrazone bond, and the drug release rate is lower in a normal physiological environment and higher in a tumor acid environment compared with electrostatic adsorption and pore storage of the DOX with HPal, so that the drug controlled release performance is obviously improved. In addition, loading of magnetic Fe3O4 nanoparticles and grafting of FA enrich the means of transporting the DOX to a designated area by the carrier, that is, the tumor cells can be positioned by external magnetic field control or receptor-ligand interaction targeting. MTT analysis and cell uptake research prove the targeting effect of the FA, and the therapeutic effect of the DOX can be effectively improved.