369 results about "Fe3o4 nanoparticles" patented technology

The invention provides an inorganic nanoparticles-modified polyurethane sponge mask material and a preparation method thereof, and also provides application of the inorganic nanoparticles-modified polyurethane sponge mask material in manufacturing a mask. In the invention, the inorganic nanoparticles used for modifying sponge comprise magnetic Fe3O4 nanoparticles, magnetic Fe2O3 nanoparticles, TiO2 nanoparticles, ZnO nanoparticles, mesoporous SiO2, carbon nanotubes and carbon fibers. The inorganic nanoparticles have the advantages of small particle size, large specific surface area, strong adsorption performance and like and contain charges on the surfaces, and a plurality of the nanoparticles have strong ultraviolet absorption capability, photocatalytic activity, and antibacterial and antiviral actions. The inorganic nanoparticles-modified polyurethane sponge mask material provided by the invention has high efficiency and capability in filtering out sub-micron dust, viruses and bacteria, has the function of adsorbing poisonous and harmful gases, has the characteristics of small gas absorption resistance, simple preparation method, low cost and broad application future, and can be recycled through water washing.

A nano-class magnetic composite Fe3O4/polystyrene material is prepared through mixing the aqueous solution of two-valence Fe salt with that of three-valence one, adding alkali solution containing surfactant, reacting to obtain Fe3O4 nanoparticles, and ball grinding for dispersing them in styrene monomer while polymerizing reaction.

A composite nanoparticle as the magnetic core carried photocatalyst is composed of the magnetic Fe3O4 nanoparticle as core, SiO2 coated on the surface of said core, and TiO2 carried by said SiO2/FeO4 particle, and is prepared by chemical codepositing method. A method for using said photocatalyst to clean sewage features that the organic pollutants in sewage is deeply oxidized by it to generate CO2 and H2O. Its photocatalyzing apparatus is composed of high-pressure Hg lamp, quartz sleeve tube, bias electrode, condensing water inlet and outlet, gas distributing plate, said photocatalyst, ring reaction chamber, organic class container, sampling opening and aerating unit.

The invention discloses a nano-drug carrier with the magnetothermal and photothermal effects. The particle size is 50 nanometers to 300 nanometers, and the nano-drug carrier is prepared from mesoporous silica particles, Fe3O4 nanoparticles embedded into the mesoporous silica particles and graphene oxide with which the surfaces of the mesoporous silica particles are coated. The invention further provides a preparation method of the nano-drug carrier. The superparamagnetic Fe3O4 nanoparticles are prepared through a solvothermal method, the Fe3O4 nanoparticles are composited by taking hexadecyl trimethyl ammonium bromide as a structure-directing agent and taking tetraethoxysilane as a silicon source through the sol-gel self-assembling process, and then magnetic mesoporous nanoparticles Fe3O4/mSiO2 with the magnetic property adjustable and controllable are prepared; the surfaces of the Fe3O4/mSiO2 mesoporous nanoparticles are coated with graphene through the ion interaction or electrostatic interaction or hydrogen-bond interaction, and then the nano-drug carrier which both can efficiently deliver anti-cancer drugs and has the magnetothermal and photothermal effects is obtained. Accordingly, cancer treatment in which medical chemotherapy cooperates with magnetothermal and photothermal treatment can be achieved.

The invention discloses an intelligent hydrogel as well as a preparation method and an application thereof and a hydrogel. The intelligent hydrogel is P(NIPAM-co-CS)/Fe3O4 and comprises iron oxide, N-isopropyl acrylamide and chitosan. The preparation method comprises the following steps: dissolving FeCl2.4H2O and FeCl3.6H2O in a mixed solvent of ethanol and water and reacting to prepare hydrophilic Fe3O4 nanoparticles under the protection of nitrogen and by adopting ammonia water as a precipitating agent; ultrasonically dispersing the prepared Fe3O4 nanoparticles in a chitosan liquid, adding a temperature-sensitive monomer N-isopropyl acrylamide and in the presence of a crosslinking agent and an initiator and by adopting tetramethylethylenediamine as an accelerator, carrying out polymerization reaction to prepare the intelligent hydrogel P(NIPAM-co-CS)/Fe3O4 by virtue of a micro-emulsion polymerization method. The intelligent hydrogel can be applied in the preparation of a water body heavy metal ion adsorption-desorption agent for removing heavy metal ions in water body.

The invention belongs to a method for preparing paramagnetic Fe3O4 nanoparticles by using iron tailings. The method comprises the following steps of: dissolving the iron tailings in a hydrochloric acid solution, filtering, and washing to realize solid-liquid separation; adding hydrogen peroxide into filtrate to oxidize Fe<2+> into Fe<3+>, adding ammonia water to regulate the pH to be 3.2, and ensuring that only Fe<3+> ions in various metal ions in the filtrate are precipitated in a form of Fe3 to separate iron; dissolving the Fe3 precipitate obtained through separation by using hydrochloric acid, adding a Fe<2+> solution, ensuring that a molar ratio of Fe<3+> to Fe<2+> in the solution is 1.5:1-1.75:1, performing coprecipitation reaction under the action of an alkali solution precipitator to obtain Fe3O4 nanoparticles, and performing ultrasonic dispersion and surfactant modification to make the prepared Fe3O4 nanoparticles have high purity, the particle size of less than 20nm, uniform particle distribution, high particle dispersibility, superparamagnetism and the saturation magnetization of 74.86emu/g. The invention provides a way for recycling waste iron tailings; and the method is easy to implement and low in cost, the environmental burden is effectively reduced, and the added value of waste resources can be improved.

A microspherical medium of ferromagnetic urea-formaldehyde resin is composed of the urea-formaldehyde resin with 0.5-20 microns of granularity and uniformly dispersed Fe3O4 nanoparticles (0.1-200 nm). Its preparing process includes preparing magnetic fluid, preparing its sol, separating and preparing magnetic microspheres. Its advantages are simple and easily controllable process and high stability.

The invention relates to a folic acid coupled targeted ferriferrous oxide/mesoporous silica/copper sulfide nano-composite particle as well as a preparation method and an application thereof. The nano-composite particle consists of Fe3O4@mSiO2 core-shell structural nanoparticles, wherein the core-shell structural nanoparticles take Fe3O4 nanoparticles as cores and mSiO2 as shells, and copper sulfide nanoparticles and folic acid cover the surfaces of the shells; the folic acid is grated on one part of the mesoporous silica (mSiO2) and the copper sulfide particles are loaded on the other part of the mesoporous silica; and polyethylene glycol is grated on the surface of the copper sulfide nanoparticles. Compared with the prior art, the nano-composite particles disclosed by the invention has a broad application prospect in the aspects of nuclear magnetic resonance imaging, drug loading and photothermal therapy; anti-cancer drugs and photothermal reagents can be transmitted to tumor parts in a targeted mode; the nano-composite particle can reduce toxic and side effects on normal tissues and cells, and meanwhile, the nano-composite particle can effectively kill cells, so that a treatment effect is further improved; and moreover, the nano-composite particle is relatively low in preparation condition demand and cost.

The invention provides a ternary composite photocatalytic nanometer reactor as well as a preparation method and an application thereof. The preparation method comprises the following steps: a step 1: a g-C3N4 photocatalyst is prepared; a step 2: a binary composite photocatalytic material Fe3O4/g-C3N4 is prepared; a step 3: the ternary composite photocatalytic nanometer reactor SiO2/Fe3O4/g-C3N4 is prepared. The ternary composite photocatalytic nanometer reactor SiO2/Fe3O4/g-C3N4 as well as the preparation method and the application thereof are disclosed, g-C3N4 is the novel organic visible photocatalyst, and at the same time, Fe3O4 nanoparticles have excellent magnetic and conductive performances. The ternary composite photocatalytic nanometer reactor has good stability and photocatalytic activity.

The invention discloses a morphology-controllable and color angle-independent photonic crystal particle and its preparation method. The preparation method comprises the following steps: mixing Fe3O4 nanoparticles, carbon black nanoparticles, graphene nanoparticles or a mixture of the Fe3O4 nanoparticles, carbon black nanoparticles and graphene nanoparticles with an emulsion containing monodisperse colloidal microspheres; printing a mixture obtained onto a superhydrophobic substrate by a spraying, dispensing or inkjet mode so as to form emulsion droplets with diameter being 11microns -1.6 mm; and drying to obtain the ellipsoidal color angle-independent colored photonic crystal particle with its length-diameter ratio being controllable. The photonic crystal particle is colourfast and environmentally friendly and has a wide application prospect in fields of pigment, display, sensing and the like.

The invention belongs to powder preparation field, more particularly relates to a method for preparing spherical magnetic Fe3O4 nanoparticles by using the coprecipitation method of a solution layer. The method comprises the steps of: forming a solution layer from the mixed alcohol solution of ferric salt and ferrous salt on a stainless steel band in a sealed container, and adding ammonia gas as precipitant to react with reactant in the solution layer to generate spherical Fe3O4 particles. In the reaction, the presence of water molecules is reduced to effectively obviate particle agglomeration. The thickness of the solution layer can be adjusted by applying the solution, and the diameter of the Fe3O4 particle can be controlled to a range from several nanometers to dozens of nanometers by controlling the concentration of the reactant alcohol solution and the thickness of the solution layer, thereby achieving good dispersivity.

The invention relates to a method for preparing rapamycin/magnetic carboxymethyl chitosan nano drug-loaded microspheres. According to the method, synthesized Fe3O4 nanoparticles are added to liquid paraffin oil, the liquid paraffin oil is then mixed with carboxymethyl chitosan liquid, a crosslinking agent is added, nanospheres are collected through magnetic separation, and magnetic carboxymethyl chitosan nanospheres are obtained through washing and drying; aqueous dispersion liquid is prepared by using the obtained magnetic carboxymethyl chitosan nanospheres, rapamycin is dissolved in acetonitrile, and stirring is carried out so as to mix the rapamycin and the acetonitrile; and magnetic separation is carried out, a lower layer of precipitate is washed by using ultrapure water, and the rapamycin/magnetic carboxymethyl chitosan nano drug-loaded microspheres are obtained through freeze-drying and crushing. The nano drug-loaded microspheres prepared by the method have the characteristics of strong targeting, high drug loading capacity, good slow release performance, small particle size, low drug toxic and side effect and the like, and the tumor cell killing rate of rapamycin drugs can be remarkably increased; and the method is simple in process, mild in preparation conditions and easy in scale production.

The invention discloses a preparation method of a nano magnetic core-shell catalyst for degrading dye wastewater. The preparation method comprises the following steps of: (1) preparing Fe3O4 nanoparticles by a coprecipitation method; (2) putting the Fe3O4 nanoparticles into 0.05 to 0.5 mol/L of FeSO4 solution, controlling the amount ratio of the Fe3O4 to the FeSO4 to be (1:3) to (1:8) and adding alkali until the pH of a reaction system is between 6 and 8; (3) adding 0.01 to 0.5 mol/L of KMnO4 solution at a low dripping speed, controlling the pH of a control system constant in a dripping process and reacting at the temperature of between 50 DEG C and 80 DEG C for 3 to 6 hours; and (4) after the reaction is finished, filtering, separating, washing with deionized water and drying an obtained product at the temperature of between 70 DEG C and 110 DEG C for 10 to 16 hours so as to obtain the nano magnetic catalyst with a core-shell structure. The catalyst has high catalytic activity under acid, nearly neutral and alkali condition, can effectively degrade methylene blue serving as an organic dye in water, has magnetism, and is easy to recycle.

The invention discloses a release mass transfer rate adjustable and controllable intelligent drug delivery carrier, which is a hollow spherical microcapsule. A membrane of the microcapsule mainly comprises poly[methacrylic-N, N-dimethylamino ethyl ester], super-paramagnetic Fe3O4 nanoparticles and poly(N-isopropyl acrylamide) temperature-sensitive sub-microspheres or poly[N-isopropyl acrylamide-copoly-acrylamide-copoly-allyl amine] temperature-sensitive sub-microspheres. A process for preparing the drug delivery carrier comprises the following steps of: (1) preparing the temperature-sensitivesub-microspheres; (2) preparing modified super-paramagnetic Fe3O4 magnetic fluid; (3) preparing intermediate phase fluid, inner phase fluid and outer phase fluid; and (4) preparing the drug delivery carrier.

The invention relates to a preparation method of a ferroferric oxide (Fe3O4) nanobelt in a network structure, belonging to the technical field of the preparation of nanomaterial. In the prior art, the Fe3O4 nanoparticles, nanorods, nanowires, nanofilms, hybrid structures, nanocrystalline in a core-shell structure and nanofibers are prepared. In the invention, the Fe3O4 nanobelt in the network structure is prepared by adopting the electrostatic spinning technology and the hydrogen thermal reduction technology. The preparation method of theFe3O4 nanobelt in the network structure comprises the following steps: (1) preparing a PVP/Fe(NO3)3 composite nanobelt by adopting the electrostatic spinning technology; (2) preparing an alpha-Fe2O3 nanobelt by carrying out thermal treatment to the PVP/Fe(NO3)3 composite nanobelt; and (3) carrying out thermal reduction to the alpha-Fe2O3 nanobelt by the mixed gas of hydrogen and nitrogen to obtain the Fe3O4 nanobelt in the network structure. The Fe3O4 nanobelt in the network structure has a good crystal type, has the width of about 3.5mu m, the thickness about 50nm and the length of more than 50mum. The preparation method of the Fe3O4 nanobelt in the network structure is simple and practical, can be used for bath production and has wide application prospect.

The invention discloses methods for preparing carboxymethyl chitosan magnetic microspheres and adsorbing cadmium in oyster meat by using the carboxymethyl chitosan magnetic microspheres. Carboxymethylchitosan and Fe3O4 nanoparticles are adopted to be dispersed in organic solvent added with emulsifying agent, coprecipitation is formed after adding sodium sulfate, treatment is conducted by using crosslinking agent, and then the carboxymethyl chitosan magnetic microspheres are prepared after washing and drying. Oyster shells are opened for taking out meat, after adding water and beating, the pHis adjusted, then the meat is mixed with the magnetic microspheres so as to adsorb cadmium in the oyster meat, and the used magnetic microspheres can be regenerated after the removal of the cadmium byadded EDTA. The application of the invention can solve the difficult problem of cadmium pollution in the oysters, and promote the effective utilization of shellfish resources.

The invention provides supermolecule hybridized hydrogel, graphene aerogel, preparation methods and application of the two. The hydrogel has a three-dimension network structure, and is obtained by assembling ferrocene-amino acid gel factor and oxidized graphene through a noncovalent bond. The supermolecule hybridized hydrogel has a high-intensity and stable current signal and good electrical properties, and is applicable to fields of trace detection devices and biosensors. The graphene aerogel is obtained by utilizing the above supermolecule hybridized hydrogel through an in-situ synthetic method, and comprises a Fe3O4 nanoparticle and nitrogen-doped three-dimension graphene. The provided Fe3O4/nitrogen-doped graphene aerogel has substantial electrocatalytic effect on oxygen reduction reactions, and has the catalytic current density up to 3 mA*cm<-2>, and the synthetic method is simple and low in cost, and is capable of providing powerful guidance for fuel cell production technologies.

The invention relates to a method for preparing a glucose difunctional monomer magnetic molecularly imprinted polymer, relates to a method for preparing a glucose molecularly imprinted polymer, and aims to solve the problem that a glucose molecularly imprinted polymer prepared from a difunctional monomer is not available at present. The method comprises the following steps: I, preparing aqueous superparamagnetism Fe3O4 nanoparticles; II, modifying the Fe3O4 nanoparticles; III, performing silanization on the Fe3O4 magnetic nanoparticles; IV, performing amination on the Fe3O4@SiO2 particles; V, preparing difunctional monomer magnetic nanoparticles; VI, synthesizing the glucose difunctional monomer magnetic molecularly imprinted polymer. The maximum saturated adsorbing capacity of Glucose@MIP to glucose is 9.111mg/g, the saturated adsorbing capacity of MNIPs is 3.112mg/g, the printing factor is up to 2.92, and after five times of repeated adsorption, the adsorbing capacity is only reduced by 5.9%.

The invention provides a preparation method of a ferromagnetic nanoparticle supported rhodium complex hydroformylation catalyst. The method comprises the following step: bonding a rhodium complex to the surface of the superparamagnetic Fe3O4 nanoparticles by a bridging ligand to obtain the ferromagnetic nanoparticle supported rhodium complex hydroformylation catalyst. The invention provides a catalyst prepared by the method and application of the catalyst in hydroformylation reaction. According to the SPION-Rh catalyst, the nanoparticles with huge surface area are combined with rhodium to construct the nano catalytic cluster, thereby being beneficial to enhancing the catalytic efficiency. The catalyst has favorable activity in hydroformylation reaction. After introducing the magnetic particles, the metal rhodium can be simply recovered by applying an external magnetic field, thereby easily solving the problem of difficulty in recovery of rhodium in the homogeneous catalysis in industry.

The invention discloses a preparation method of L-proline-loaded temperature/magnetism double responsive functional hybrid microspheres. The technical point is as follows: a temperature-sensitive amphipathic block polymer is obtained by polymerizing functional L-proline ProlA, a temperature-sensitive monomer N-isopropylacrylamide NIPAM and a hydrophilic monomer oligomeric ethylene glycol acrylate OEGA by virtue of a reversible addition fragmentation chain transfer (RAFT) polymerization method and is loaded to magnetic Fe3O4 nanoparticles by virtue of a ''click chemistry'' method so as to obtain the temperature/magnetism double responsive hybrid microspheres. The hybrid microspheres can be used for catalyzing direct asymmetric Aldol reaction in a water phase, and the temperature of a reaction system is higher than a lower critical solution temperature (LCST) of the block polymer, so that the improvement of the catalytic efficiency of the Aldol reaction and the release of organic products are benefited; and by virtue of the magnetism, the hybrid microspheres can be efficiently separated and recycled and repeatedly used.

The invention relates to a preparation method for a magnetic adsorption material for adsorbing heavy metals. The method comprises the following steps: dissolving carboxymethyl chitosan in water to prepare a solution, then, adding activated carbon powder, oleic acid wrapped magnetic Fe3O4 nanoparticles and a cross-linker into the solution so as to obtain a reaction system, uniformly stirring the reaction system, and then, adjusting the pH of the reaction system to 9 to 12, wherein the mass ratio of the carboxymethyl chitosan to the activated carbon powder to the oleic acid wrapped magnetic Fe3O4 nanoparticles is 1: (1 to 5): (1 to 5); and then, subjecting the reaction system to an isothermal reaction for 5 to 12 hours at the temperature of 60 DEG C to 90 DEG C, carrying out solid-liquid separation after the reaction is complete, and subjecting the product to washing, drying, grinding and sieving, thereby obtaining the magnetic adsorption material. According to the magnetic material disclosed by the invention, the structure is stable, the specific surface area is greater than 200m<2>/g, the magnetic material can be rapidly separated under the condition of an external magnetic field without generating secondary pollution; and the material can be recycled repeatedly, so that the soil restoration cost is reduced.

The invention discloses a magnetic palladium composite catalyst, and a preparation method and a use thereof. The magnetic palladium composite catalyst adopts superparamagnetic Fe3O4@SiO2 microspheres as a carrier, the surface is covalently modified with supported amino Pd (II) particles, and the catalyst is obtained through the steps of sequentially preparing Fe3O4 nanoparticles, preparing core-shell structured magnetic nanometer microspheres Fe3O4@SiO2 and preparing a Fe3O4@SiO2 supported amino ligand. The magnetic amino palladium composite catalyst can be applied in a Suzuki reaction, can realize approaching equal conversion of halobenzene with an electron donating group or an electron withdrawing group, and has unobvious decreasing activity after the catalyst is continuously used 5 times due to no obvious decrease of the supported amount of an active ingredient.

The invention relates to a magnetic lipase nano-flower catalytic material and a preparation method and an application thereof, and belongs to the field of enzyme immobilization. The preparation methodof the magnetic lipase nano-flower catalytic material is characterized in that silicon-based magnetic Fe3O4 nanoparticles are dispersed into lipase solution; metal cation inorganic salt solution is dripped into the lipase solution to obtain the magnetic lipase nano-flower; the silicon-based magnetic Fe3O4 nanoparticles are Fe3O4 nanoparticles treated by a silane coupling agent. The catalytic material is characterized in that the excellent performances of the lipase-inorganic hybrid nano-flower and the magnetic nanoparticles are fully combined together, so that the inorganic hybrid nano-flowerand the magnetic nanoparticles have wide application values in the fields of biocatalysis, biological medicine, food industry and the like.