253 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 preparation method of sandwich type immunomagnetic beads with high thermal stability, which comprises the following steps: by taking polystyrene microspheres as a template, introducing oil-phase Fe3O4 nanoparticles into the polystyrene microspheres through a swelling method, and then carrying out hydrolytic condensation reaction on the surface of a microsphere assembly by utilizing n-octyltrimethoxysilane OTMS to obtain the sandwich type immunomagnetic beads with high thermal stability. The preparation method comprises the following steps: carrying out surface amination modification on a silicon dioxide thin layer which is grown by hydrolysis of tetraethoxysilane TEOS to realize coating of an outermost organic shell layer, carrying out surface amination modification, and carrying out cross-linking on 1, 4-butanediol diglycidyl ether and erythritol on the surface to form an epoxy polymer layer so as to obtain the sandwich-type immunomagnetic bead with a cross-linked epoxy polymer layer introduced to the outer layer. According to the epoxy group modification process on the surface of the magnetic bead, a direct cross-linking modification process is adopted, so that the operation steps are simplified, and the obtained epoxy group magnetic bead is ensured to show excellent biocompatibility. In addition, the method omits the tedious process of functional group activation, and allows direct coupling with the antibody, thereby greatly improving the efficiency and convenience of the experiment.

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 relates to the technical field of harmful substance detection, in particular to a preparation method and application of a magnetic organic covalent framework material for extracting pyrethroid pesticide in peanuts, and the preparation method comprises the following steps: step 1, dropwise adding an iron standard solution into a NaOH solution, stirring to react, cooling to room temperature after the reaction is finished, then dropwise adding a sodium citrate solution, mechanically stirring, and filtering to obtain a filtrate; magnetically separating a product, washing and drying to obtain Fe3O4 nanoparticles; step 2, mixing the Fe3O4 nanoparticles, DVA, TA, TAPT and acetonitrile, performing ultrasonic treatment, then adding acetic acid, oscillating the mixture, and then stirring and refluxing; the product is washed and dried, and COF coated Fe3O4 is obtained; step 3, uniformly dispersing COF coated Fe3O4 in an acrylamide solution, and then irradiating by a xenon lamp; and washing and drying the product to obtain the magnetic organic covalent framework material PAM-COF coated Fe3O4. The PAM-COF coated Fe3O4 material prepared by the preparation method disclosed by the invention can realize efficient extraction of various pyrethroid pesticides at the same time, and has relatively strong matrix anti-interference capability and excellent enrichment and purification performance.

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

The invention provides application of Fe3O4 nanoparticles in preparation of a medicine for treating benign prostatic hyperplasia, and relates to the technical field of biological medicines. The invention further discloses application of the Fe3O4 nano-particles in preparation of a medicine for treating benign prostatic hyperplasia. The research result of the invention emphasizes that the ferroferric oxide nanoparticles are a promising candidate drug for targeted therapy of BPH and related prostate diseases, and new possibility is provided for treatment intervention of urinary surgery. The inventor studies the effect of the Fe3O4 nanoparticles in inhibiting benign prostatic hyperplasia. Results of the inventor show that the nanoparticles not only effectively reduce the proliferation rate of prostate cells, but also improve related biochemical indexes. Therefore, the polypeptide has potential application in treatment of prostatic hyperplasia.

The present invention discloses a basalt fiber reinforced thermoplastic composite material with electromagnetic wave shielding function and its preparation method. The composite material is prepared by melt blending basalt short fibers after surface modification and thermoplastic plastics in a certain proportion. The preparation method of the surface-modified basalt short fibers is as follows: The basalt fibers, surface lipophilized modified Fe3O4 nanoparticles, carbon nanotubes or graphene nanosheets, and dopamine that have undergone surface cleaning treatment are dispersed in a buffer solution for polymerization reaction, and a polydopamine / Fe3O4 nanoparticle composite coating layer is formed on the surface of the basalt fibers, and at the same time, carbon nanotubes or graphene nanosheets are adhered to its surface. The composite material of the present invention not only obtains more excellent mechanical strength, but also has electromagnetic wave shielding function at the same time.

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 relates to a method for preparing an efficient electromagnetic shielding graphene film by using a rapid Joule heat technology, and belongs to the technical field of functional materials and application thereof. The method comprises the following steps: firstly, preparing a graphene oxide film through vacuum filtration, then carrying out pre-reduction treatment under the protection of argon, heating the film to 700 DEG C, and carrying out heat preservation for 1 hour so as to remove part of oxygen functional groups; and then, soaking the pre-reduced film in a ferric chloride ethanol solution, introducing a Fe3O4 nanoparticle precursor, and carrying out discharge treatment for 0.1 second under the voltage of 100V through a rapid Joule thermal reduction technology to realize rapid reduction of graphene oxide and doping of Fe3O4 nanoparticles. The finally prepared graphene film shows excellent electromagnetic shielding effectiveness in an X wave band (8-12 GHz), the electromagnetic shielding effectiveness reaches 38 dB, and the electromagnetic shielding effectiveness is improved by 2 dB compared with a sample (36 dB) not doped with Fe3O4. The method has the advantages of being easy and convenient to operate, low in energy consumption and high in reduction efficiency, meanwhile, the synergistic effect of conductivity loss, magnetic loss and dielectric loss is achieved through introduction of the Fe3O4 nanoparticles, the electromagnetic shielding performance of the material is remarkably improved, and the method is suitable for the fields of electromagnetic interference protection of electronic equipment and the like.

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 provides a probe for detecting bacteria in air as well as a preparation method and application of the probe. The probe comprises Au-Fe3O4 nanoparticles and a recognition medium combined on the surfaces of the Au-Fe3O4 nanoparticles, and the recognition medium comprises at least one of a mixture of 5 (6)-carboxyl fluorescein and 3-(aminomethyl) phenylboronic acid hydrochloride and a product obtained by taking the 5 (6)-carboxyl fluorescein and the 3-(aminomethyl) phenylboronic acid hydrochloride as reactants. When the probe is used, air is sampled, maltose is added for incubation, a solution possibly containing bacteria after incubation is taken, then the obtained solution is mixed with the probe, and the content of the bacteria in the air can be correspondingly obtained through a fluorescence signal shown by the probe. The content of bacteria in the air can be effectively obtained through the probe. Meanwhile, the probe is simple to prepare and convenient to use, and is favorable for promoting the development of a technology for detecting bacteria in air.

The invention relates to the field of soil remediation materials, in particular to a nano-enzyme composite material, a preparation method of the nano-enzyme composite material and application of the nano-enzyme composite material in remediation of organic chemical pesticide pollution of soil, and the preparation method of the nano-enzyme composite material comprises the following steps: S1, sequentially coating the surfaces of Fe3O4 nano particles with a compact SiO2 layer and a mesoporous SiO2 layer to form an SFe3O4atMSN composite material; s2, the surfaces of the CaO2 nanoparticles are coated with a compact SiO2 layer, and an SCaO2 composite material is formed; s3, preparing a chitosan ferrous complex solution Cs-Fe, and uniformly dispersing the SFe3O4 (at) MSN composite material in the Cs-Fe solution to form a dispersion liquid containing the SFe3O4 (at) MSN (at) Cs-Fe composite material; and S4, adjusting the pH value of the dispersion liquid containing the SFe3O4 (at) MSN (at) Cs-Fe composite material to 7-10, and dispersing SCaO2 in the solution to obtain the SFe3O4 (at) MSN (at) SCaO2 (at) Cs-Fe. The nano-enzyme composite material disclosed by the invention is applied to acid soil, and organic chemical pesticide pollutants in the acid soil can be effectively degraded.

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 biochemistry, in particular to a specific affinity enrichment and preparation method of a torreya grandis protease hydrolysate ACE inhibitory peptide, which comprises the following steps: step 1, preparing and characterizing magnetic aminated Fe3O4 nanoparticles; step 2, preparing and characterizing the immobilized trypsin; 3, preparing and characterizing the immobilized ACE, and optimizing reaction conditions; step 4, determining the activity of the immobilized ACE; step 5, then preparing and specifically enriching the Chinese torreya antihypertensive peptide; step 6, then, carrying out molecular docking through AutoDock Vina; according to the method, genipin is adopted as a cross-linking agent, magnetic Fe3O4 nanoparticles with the ACE inhibitory peptide specific affinity recognition function are constructed, specific enrichment of the ACE inhibitory peptide from the torreya grandis cake protein hydrolysate is achieved, and specific separation is achieved.

The invention relates to a preparation method and application of a targeted pancreatic cancer immune checkpoint diagnosis and treatment integrated nanoprobe, which can realize integration of sonodynamic therapy and MRI imaging of pancreatic cancer cells with high expression of VISTA, realize targeted SDT therapy of pancreatic cancer and visual evaluation of the therapeutic effect, have good biological safety, and can be applied to diagnosis and treatment of pancreatic cancer cells with high expression of VISTA. SDT visual treatment of targeted pancreatic cancer is realized at a cellular level, and SDT combined immunotherapy of pancreatic cancer is realized at an animal level. The method comprises the following steps: (1) preparing Fe3O4 nanoparticles by using a solvothermal method; (2) preparing Fe3O4 (at) SiO2 nano particles; (3) preparing Fe3O4 (at) SiO2 (at) TiO2 nano particles; (4) preparing Fe3O4 (at) TiO2 by adopting an alkaline hydrothermal corrosion auxiliary crystallization method; and (5) modifying the nanoprobe with a VISTA antibody through an electrostatic adsorption method, and finally successfully constructing the garland-shaped nanoprobe.

The invention relates to a method for controllably preparing a magnetic nanofiber film by current regulation and control magnetic field assisted electrospinning, which comprises the following steps: weighing PAN white powder, dissolving in a DMF organic solvent, continuously stirring by magnetic field force, and carrying out ultrasonic dispersion treatment on the solution by using an ultrasonic cleaner to prepare a uniformly dispersed PAN / DMF solution; adding Fe3O4 nanoparticles and a dispersing agent Triton X-100 with the same amount as the Fe3O4 nanoparticles into the prepared solution, and performing ultrasonic dispersion treatment to form a uniformly dispersed magnetic electrostatic spinning solution; according to the prepared magnetic electrostatic spinning solution, a thin and uniform high-performance magnetic nanofiber sample is prepared through a controllable magnetic field generated by a current control electromagnetic lens to assist an electrostatic spinning device, the thin and uniform high-performance magnetic nanofiber sample is placed in a drying box to be dried, and the thin and uniform high-performance magnetic nanofiber sample with the reduced deposition circle area, the increased thickness, the increased mechanical property, the improved magnetic property and the high-performance magnetic performance is obtained. The average diameter of the nanofibers is reduced and the nanofibers are uniform.

The invention discloses terahertz wave-absorbing foam based on magnetically-induced gradient distribution carbon nanotubes and a preparation method, and belongs to the technical field of photoelectric materials and devices. The terahertz wave-absorbing foam comprises a porous framework and a wave-absorbing agent distributed in the porous framework, wherein the porous skeleton is a PDMS matrix with holes, the wave-absorbing agent is MWCNT modified by Fe3O4 nanoparticles, and the mass percentage of the wave-absorbing agent in the wave-absorbing foam is 3-7wt%. The dielectric constant of the wave-absorbing foam is regulated and controlled by controlling the concentration of the MWCNT modified by the Fe3O4 nanoparticles, and the concentration of the MWCNT can be guided to be distributed in a longitudinal gradient manner by using an external magnetic field, so that surface electromagnetic impedance matching is realized, and finally reflection suppression and absorption enhancement of electromagnetic waves are completed; meanwhile, large-area preparation can be realized by using white granulated sugar as a sacrificial template, and the method is suitable for industrial production.

The invention belongs to the technical field of analytical chemistry, and particularly discloses a magnetic fluorescent gold nanocluster molecularly imprinted polymer and a preparation method and application thereof in sulfadiazine fluorescence detection.The surface of Fe3O4 nanoparticles is coated with a silicon dioxide shell layer, the shell layer is subjected to surface modification, and then the Fe3O4 nanoparticles are combined with gold nanoclusters (AuNCs). On the basis, sulfadiazine (SD) is selected as a template molecule by utilizing a molecular imprinting technology, a mixed type silane coupling agent (APTES) is used as a functional monomer, and the surface of the Fe3O4 (at) SiO2 (at) AuNCs is coated with a molecular imprinting layer, so that the magnetic fluorescent gold nanocluster imprinted polymer Fe3O4 (at) SiO2 (at) AuNCs-MIPs is prepared. By combining a magnetic separation technology, high selectivity of the molecularly imprinted polymer, simplicity, convenience and rapidness and high sensitivity of fluorescence detection, sulfadiazine can be accurately and specifically recognized, and the method can be effectively applied to analysis and detection of sulfadiazine.

The invention belongs to the technical field of biological materials, and discloses a pH response type magnetic hierarchical porous MOFs composite material and a preparation method thereof, the composite material is formed by emulsifying and cross-linking magnetic MOFs composite nanospheres with Fe3O4 nanoparticles as a core and an MOFs layer as a shell, and the composite material is of a cluster structure. According to the hierarchical porous structure of the composite material, the pore diameter is increased, the specific surface area of MOFs is increased, the yield of protein can be increased, and the application efficiency is improved; the method can be used for protein enrichment and release.

The invention provides magnetic porous silica gel as well as a preparation method and application thereof. The magnetic porous silica gel comprises a magnetic silica gel inner core and a silicon dioxide coating layer arranged on the surface of the magnetic silica gel inner core, the magnetic silica gel inner core comprises a porous silica gel carrier and # imgabs0 # magnetic nanoparticles loaded on internal pore channels of the porous silica gel carrier. Ferroferric oxide is prepared in pores inside the porous silica gel microspheres through a simple method, and Fe3O4 nanoparticles are converted into # imgabs1 # magnetic nanoparticles with higher magnetic responsiveness and chemical stability through high-temperature calcination, so that the problem of magnetism weakening is solved.

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 present invention provides a magnetothermal dual-responsive green nanoemulsifier and a preparation method thereof, belonging to the technical field of emulsifiers. The preparation method comprises the following steps: S1. preparing Fe3O4 nanoparticles; S2. preparing Fe3O4@SiO2 nanoparticles; S3. preparing Fe3O4@SiO2@NH2 nanoparticles; S4. preparing Fe3O4@SiO2@Br nanoparticles; and S5. preparing Fe3O4@SiO2@PNIPAM nanoparticles, which are the magnetothermal dual-responsive green nanoemulsifier. The preparation method of the present invention is simple and controllable, with a short cycle time. The resulting nanoemulsifier has good emulsification effect, high stability, and is environmentally friendly. It has efficient magnetothermal responsiveness and can be recycled and reused.

The invention discloses a preparation method of a magnetically-driven diatom cell micron robot based on natural diatom shells and a photodynamic therapy method of the magnetically-driven diatom cell micron robot. The method comprises the following steps: firstly, centrifugally enriching a diatom suspension, treating the diatom suspension in a 0.1 M HCl darkroom for 4 hours, removing surface calcium and exposing a porous structure; and carrying out shaking table resonance with positively charged Fe3O4 nanoparticles (300 [mu] g / mL) for 1.5 h, uniformly modifying the magnetic particles on the surface of the shell through electrostatic adsorption, centrifuging, washing, and freeze-drying at-80 DEG C to obtain the Mag-Diatom. The prepared Mag-Diatom not only retains the autofluorescence of natural chlorophyll in diatom and the capability of generating active oxygen through laser triggering, but also can realize directional control and rapid separation in an external magnetic field due to superparamagnetic response of Fe3O4 modification. The invention provides a controllable and directional micro-nano robot PDT platform which has good biocompatibility and a wide clinical application prospect.

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%.