41 results about "Ferrite nanoparticles" patented technology

The invention discloses a ferrite nanoparticle-loaded biochar adsorption material and a preparation method thereof, and the ferrite nanoparticle-loaded biochar adsorption material is prepared by the following steps: S1, sieving biochar, cleaning and drying to obtain pretreated biochar; s2, adding the pretreated biochar into a nitric acid solution, mixing, cleaning, filtering and drying to obtain a material A; s3, respectively dissolving a water-soluble ferric salt and a water-soluble sodium salt in water to obtain a ferric salt solution and a sodium salt solution, and mixing the ferric salt solution and the sodium salt solution to obtain a solution a; and S4, adding the material A into the solution a, mixing, cleaning, and drying to obtain the ferrite nanoparticle-loaded biochar adsorption material. By controlling the proportion of the components and the proper raw material ratio, the ferrite nanoparticle-loaded biochar adsorption material for the permeable reactive barrier, which is relatively strong in adsorption catalysis capability, can be prepared, and arsenic ions in pollutants can be efficiently adsorbed.

The invention relates to the technical field of plastic modification processing, in particular to high-conductivity composite system coated black talcum powder and a preparation method thereof as well as a modified master batch containing the black talcum powder and a preparation method of the modified master batch. The high-conductivity composite system coated black talcum powder coating material is prepared from the following components in percentage by mass: 65.0 to 76.0 weight percent of high-conductivity composite system coated black talcum powder, 5.0 to 10.0 weight percent of cobalt ferrite nanoparticles, 15.0 to 20.0 weight percent of carrier resin, 2.0 to 3.0 weight percent of dispersing agent and 0.5 to 1.0 weight percent of lubricating agent, according to the technology provided by the invention, the black talcum powder is changed from a common traditional inorganic filler to a high-end functional filler with a conductive functional modification effect, so that the product added value of the black talcum powder is improved, and an important contribution is made to development and application of black talcum powder ore in China.

The invention relates to the technical field of electromagnetic shielding materials, and discloses an anti-electromagnetic interference high-frequency lightweight nano new material, which is composed of 10-35% of graphene quantum dots, 5-20% of multi-walled carbon nanotubes, 5-20% of ferrite nanoparticles and 10-30% of a polymer matrix. The content of the ferrite nanoparticles is 15%-25%, and the content of the polymer matrix is 40%-55%; according to the composite material, through the synergistic effect of the graphene quantum dots, the multi-walled carbon nanotubes and the ferrite nanoparticles, the electromagnetic shielding effectiveness, the mechanical strength, the thermal stability and the lightweight property of the composite material are remarkably improved, and the composite material is particularly suitable for the fields of high-frequency electronic equipment, communication equipment and aerospace; the material has good processability, stable performance and efficient electromagnetic interference shielding capability, and can meet the requirements of modern high-frequency equipment on light, high-temperature-resistant and efficient shielding materials.

The invention relates to the technical field of production of nano composite materials, in particular to space heterostructure ferrite nano particles with a hepatocyte targeting function and a preparation method of the space heterostructure ferrite nano particles. According to the nanoparticles, a core layer and a shell layer are doped with metal elements in a gradient manner, and a ligand layer with a hepatocyte targeting function is modified, so that a physical-chemical three-layer composite system with a spatial heterostructure is formed. According to the magnetic resonance imaging contrast agent prepared on the basis of the spatial heterogeneous distribution of gradient doping of the ferrite nanoparticles by regulating and controlling the types and concentrations of doping elements, the enrichment effect and the local recognition capability in a liver region can be remarkably enhanced, the relaxation rate of the ferrite nanoparticles is effectively increased, and the magnetic resonance imaging contrast agent has a good application prospect. The contrast ratio, the imaging speed and the effective imaging time window of living liver and gall imaging are optimized, and meanwhile, the biocompatibility and the metabolic performance of the material are improved.

The invention relates to the technical field of nano composite material production, in particular to a segmented pH-controlled polyethylene glycol derivative modified superparamagnetic ferrite nanoparticle ligand exchange method and system. According to the segmented pH-controlled ligand exchange method for the polyethylene glycol derivative modified superparamagnetic ferrite nano-particles, the initial state of a reaction system for preparing the polyethylene glycol derivative modified superparamagnetic ferrite nano-particles, the stage reaction time and the stage pH target are controlled; the injection volumes and the injection rates of the buffer systems in different stages are determined according to the acid-base properties, the concentrations and the volumes of different polyethylene glycol derivative modifications and superparamagnetic ferrite nanoparticle ligands under the conditions of the concentrations of hydrogen ions and hydroxyl ions of different buffer systems, and a system capable of realizing the method is designed. By optimizing the ligand exchange process, the preparation capacity is improved, the modification efficiency is improved, particle aggregation is inhibited, and hydrophobic ligand residues are reduced.

The present disclosure relates to a method of making CuFe2O4 nanoparticles from metal cans. The method includes cutting the metal can into small pieces, adding concentrated nitric acid to the pieces to obtain an iron nitrate solution, and adding an aqueous sodium hydroxide solution to the iron nitrate solution to provide a precipitate. The precipitate can be centrifuged and dissolved with HNO3 to obtain an iron nitrate solution. The iron nitrate solution can be mixed with copper nitrates to obtain a mixture. Aqueous NaOH solution can be added to the mixture to obtain an aqueous precipitate including the CuFe2O4 nanoparticles.

The present invention relates to a process for fabricating an electrochemical device based on praseodymium-doped nickel-ferrite nanoparticles and an electrochemical device thereof. The nickel ferrites are synthesized using solution combustion method, with praseodymium doping concentrations varying from 0 to 0.02. The prepared nanoparticles are characterized for thorough analysis of their structural, morphological, and electrochemical properties, wherein a three-electrode system is developed for evaluation of electrochemical performance of the prepared nanoparticles. The results showed that optimal Pr-doping enhanced both the electrical conductivity and charge storage capacity of the material, wherein the sample with 0.01 Pr-doping (NP-3) exhibited the highest specific capacitance of 69.2 F / g at a current density of 0.1 A / g, with a low charge transfer resistance of 0.30 Ω, making it suitable for energy storage devices.

The invention discloses quasi-paramagnetic ferrite nanoparticles prepared through asynchronous dynamic time sequence thermal decomposition and a method. According to the method, a first group of precursors and a second group of precursors with specific thermal decomposition temperature difference are added at a time, and the temperature and time of a plurality of stages such as preheating, nucleation doping, shell doping and grain growth in a programmed heating process are accurately controlled, so that effective coupling of asynchronous decomposition of the precursors and directional doping of core-shell components is realized. The quasi-paramagnetic ferrite nanoparticles prepared by the method have an ultra-small size of 2-6 nanometers, a core-shell structure and high monodispersity, the core part of the quasi-paramagnetic ferrite nanoparticles is an ordered phase rich in a first group of precursor metals, and the shell part of the quasi-paramagnetic ferrite nanoparticles is a disordered phase rich in a second group of precursor metals. The nano-particles show remarkably improved magnetic resonance imaging T1 relaxation efficiency which is far better than that of existing similar contrast agents, and can be used for preparing efficient and safe magnetic resonance imaging T1 contrast agents.

The application discloses a kind of magnetically induced orientation titanium carbide ferrite composite film and its preparation method and application.The application solves the single mode of electromagnetic wave loss of MXene titanium carbide material and the low electromagnetic shielding efficiency, the developed magnetic induction orientation strategy can realize the same pole arrangement of the magnetic pole of introduced ferrite nanoparticles, control material structure in nanometer scale, rich the pore of MXene titanium carbide ferrite composite film, while inducing MXene titanium carbide sheet orientation in the same pole arrangement process of ferrite magnetic pole.In the preparation process of ferrite nanoparticles, by loading citric acid group on the surface of ferrite, the dispersibility of ferrite in MXene titanium carbide gel is improved, and the interaction between ferrite and MXene titanium carbide is enhanced.The prepared magnetically induced orientation MXene titanium carbide ferrite composite film shows an average electromagnetic shielding efficiency of 62.8 dB in the range of 2-18 GHz, and a highest Herman's orientation factor of 0.938.

The invention discloses a limited-metal-thickness wide-suppression 800-watt high-power microstrip low-pass filter, which relates to the technical field of microwave communication and comprises a first low-pass filtering structure, a second low-pass filtering structure, a third low-pass filtering structure and a third low-pass filtering structure, the micro-strip line structure is used for controlling the arrangement of ferrite nano-particles injected into the external cooling liquid micro-fluidic circulation network pipeline and the internal cooling liquid micro-fluidic circulation network pipeline, enhancing the stability and repeatability of the filtering process, adjusting the resonant frequency of the micro-strip line structure, realizing dynamic frequency tuning, and adjusting the temperature of the micro-strip line structure according to the dynamic condition of temperature change. The working state of the device is dynamically adjusted, the power processing capability is improved, and the dynamic suppression of out-of-band noise is realized, so that the whole device can stably operate in a high-power state of 800 watts, the overall out-of-band suppression capability is effectively improved, the frequency tuning range is effectively expanded, the stability and reliability of high-power signal processing are ensured, and the high-power signal processing efficiency is improved. And the temperature stability and the power processing capability are also enhanced.

The invention belongs to the technical field of nano medicine, and particularly relates to a tumor vaccine adjuvant and application thereof. The tumor vaccine adjuvant is a ferrite particle adjuvant prepared by reacting ferrite nanoparticles with an organic polymer in a mass ratio of 1: (1-200) at 50-60 DEG C. The invention provides a novel tumor vaccine adjuvant, which can enhance the stimulation and activation of a tumor vaccine on dendritic cells, efficiently activate anti-tumor immune cells, and improve the tumor immunity of the tumor vaccine. The immune response of an organism to an antigen is improved, and the treatment effect of the vaccine is remarkably improved.

There are provided nanoparticles useful as Oxygen Evolution Reaction (OER) catalysts. These are nanoparticles of a ferrite of formula MnxCoyNi2Fe3−(x+y+z)O4, wherein each of x, y and z is ≥0 and ≤1, and wherein 0<(x+y+z)<1.5, wherein the ferrite has a spinel crystalline structure, wherein the nanoparticles have a truncated octahedron shape exposing facets, wherein said facets comprise 6 square facets and 8 hexagonal facets, wherein the square facets correspond to the {100} crystal plane and the hexagonal facets correspond to the {111} crystal plane, and wherein the nanoparticles are up to about 500 nm in size. We also provide a catalyst comprising these and the use of these nanoparticles as a catalyst. Are further provided a composition for an electrode and an electrode comprising these nanoparticles. Finally, there is provided an electrolytic cell comprising an electrode comprising the nanoparticles.

The invention discloses a preparation method and application of composite ferrite-loaded magnetic calcium sulfate whiskers, and the preparation method comprises the following steps: pretreating electroplating wastewater with ferrous sulfate, then adding ferroferric oxide nanoparticles, mixing and stirring, adding calcium oxide, aging, and then carrying out solid-liquid separation and drying to obtain the composite ferrite-loaded magnetic calcium sulfate whiskers. The magnetic calcium sulfate whisker loaded with the composite ferrite nanoparticles is obtained; in addition to Cr < 6 + > and Cr < 3 + >, the electroplating wastewater also contains at least one of Ni < 2 + >, Cu < 2 + >, Mn < 2 + >, Fe < 2 + > and Fe < 3 + >. According to the method, heavy metal ions in the electroplating wastewater can be directly converted into reusable and practical solid chemicals, meanwhile, no toxic waste is generated, no new pollution is caused, and carbonyl sulfide in gas can be effectively removed through the obtained solid chemicals.

The invention discloses a composite filler, an interlayer prepreg, a copper-clad plate and a preparation method and application of the copper-clad plate, and belongs to the technical field of copper-clad plates. The preparation method of the composite filler comprises the following steps: dispersing hexagonal boron nitride nanosheets in a Piranha solution for reaction to obtain surface hydroxylated BNNS; the preparation method comprises the following steps: dispersing Ni-Zn ferrite nanoparticles in nitric acid, and carrying out ultrasonic treatment to obtain activated Ni-Zn ferrite; and carrying out electrostatic self-assembly on the activated Ni-Zn ferrite and the surface hydroxylated BNNS. The Ni-Zn ferrite is a low-magnetic material, so that the dielectric constant and dielectric loss of the copper-clad plate can be reduced, and the copper-clad plate can have relatively high heat conductivity coefficient and relatively low dielectric constant and dielectric loss. The composite filler can form boron nitride nanosheets which are vertically arranged under the condition of a vertical magnetic field, and heat can be quickly transferred to the outside of the surface from the inside of the copper-clad plate, so that the heat is transferred to the external environment, and the problem of heat accumulation of the copper-clad plate is solved.

A magnetic nanofluid that includes magnetic transition metal ferrite nanoparticles, ferroelectric nanoparticles, and a carrier fluid, and a method of changing the temperature of an object (e.g., heating or cooling) using the magnetic nanofluid. The magnetic transition metal ferrite nanoparticles and ferroelectric nanoparticles can be present as a composite comprising both types of nanoparticles. The use of the magnetic nanofluid is associated with an increase in the Nusselt number in the presence of a magnetic field.

An apparatus and method for cooling a wireless power transfer (WPT) transmitter coil. The apparatus may include a reservoir holding coolant. The apparatus may further include a coolant loop, wherein the coolant loop may include a plurality of heat sinks. The apparatus may further include a pump. The apparatus may further include a WPT transmitter coil, wherein coolant flows from the reservoir through the coolant loop into the plurality of heat sinks via the pump, wherein heat from the WPT transmitter coil is transferred from the plurality of heat sinks to the coolant.

A copper ferrite synthesis describing the use of cuprous, ferric, and borate ions is disclosed. Cuprous and ferric compounds react with sodium borate to form cuprous ferric oxide precipitates. Oxidizing a cuprous ferric oxide with an oxygen enhanced flame, synthesizes copper ferrite. The cuprous ferric oxide may be reduced to nanoparticle size via pulverization to produce copper ferrite nanoparticles.

The application belongs to the technical field of biomedical engineering and relates to a superparamagnetic ferrite nanoparticle modified by a carboxyl-terminal NBDHEX prodrug as a ligand and a preparation method thereof. A dicarboxylic acid containing a disulfide bond is used as a connecting unit to react with NBDHEX to prepare a carboxyl-terminal NBDHEX prodrug, and then the carboxyl-terminal NBDHEX prodrug is used to perform ligand exchange on superparamagnetic ferrite nanoparticles stabilized by oleic acid on the surface, so as to construct a functional layer of the NBDHEX prodrug on the surface of the nanoparticles. In this way, the drug NBDHEX interfering with the redox metabolism balance in cells and the superparamagnetic nanoparticles capable of inducing an active oxygen related effect are integrated into one, and the coupling degree of the superparamagnetic ferrite nanoparticles and the drug NBDHEX in the intracellular action process is enhanced. The disulfide bond connecting unit can be broken in a reducing environment to release NBDHEX and / or an active derivative thereof, the intervention of the nanoparticles on the intracellular redox homeostasis is enhanced, and the nanoparticles are beneficial to the application in antitumor treatment.

The invention relates to the technical field of production of nano composite materials, in particular to a dynamic pH regulation and control thermal decomposition method for polyethylene glycol derivative modified superparamagnetic ferrite nano particles. The pH value in the process of preparing the polyethylene glycol derivative modified superparamagnetic ferrite nano-particles through high-temperature thermal decomposition is dynamically detected through combined use of online Fourier transform infrared and Raman spectrum, and according to the temperatures of a nucleation stage, a growth stage and a modification stage, the real-time pH value and the target pH value, the real-time pH value and the target pH value are calculated according to the temperature, the real-time pH value and the target pH value. And adjusting agents with different groups are selected to dynamically control the pH values in different stages. The requirement for dynamically collecting the pH value of the high-temperature organic phase can be met, a pH value correction method based on dynamic pH value and temperature coupling is established, fusion control information for controlling the adding rate of a regulator is formed, the crystal nucleus generation rate and number are controllable, the particle size standard deviation is effectively reduced, and the crystal lattice integrity and colloid stability of a product are improved.

A magnetic nanofluid that includes magnetic transition metal ferrite nanoparticles, ferroelectric nanoparticles, and a carrier fluid, and a method of changing the temperature of an object (e.g., heating or cooling) using the magnetic nanofluid. The magnetic transition metal ferrite nanoparticles and ferroelectric nanoparticles can be present as a composite comprising both types of nanoparticles. The use of the magnetic nanofluid is associated with an increase in the Nusselt number in the presence of a magnetic field.

The utility model relates to the technical field of production of nano composite materials, in particular to cooling equipment for preparing superparamagnetic ferrite nano particles through high-temperature thermal decomposition, which comprises a cooling tower, a cold source module, a distributed composite multi-stage cooling module, an electric control pump set, an electric control valve, a connecting pipeline, a temperature sensor, an ultrasonic flowmeter, a cooling box and a control module, according to the method, the temperature distribution uniformity can be ensured while the cooling rate is met in the cooling link of preparing the superparamagnetic ferrite nanoparticles, and the magnetic balance, dispersity and large-scale requirements of preparing the superparamagnetic ferrite nanoparticles are met.

The invention belongs to the technical field of nano biomedicine, and particularly relates to a method for regulating and controlling polarization of macrophages. Comprising the following steps: co-culturing ferrite nanoparticles and macrophages, so that the macrophages are polarized to M1 type; the ferrite nano-particles are MnFe2O4, CoFe2O4, ZnFe2O4 or MgFe2O4, and the ferrite nano-particles are MnFe2O4, CoFe2O4, wherein during co-culture, the mass of the ferrite nanoparticles is 20-400 [mu] g, and the concentration of the macrophages is 1 * 10 < 5 >-1 * 10 < 6 > cells / mL. According to the invention, ferrite nano-particles are used as experimental materials, and the polarization of macrophages is successfully induced by using the peroxidase-like activity of the nano-particles and metal ions carried by the nano-particles.

Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described.

This invention discloses a highly stable magnetic liquid and its preparation method, belonging to the field of magnetic fluid nanomaterials related to shipbuilding. The magnetic liquid comprises a metal-doped ferrite nanoparticle core, a bilayer surface-modified layer composed of oleic acid and a silane coupling agent, and a composite carrier liquid composed of polyalphaolefin synthetic oil and perfluoropolyether with added nanodiamonds. In preparation, metal-doped ferrite nanoparticles are first obtained through co-precipitation and calcination, then modified by bilayer coating, and finally mixed with the composite carrier liquid, ball-milled, ultrasonically treated, and magnetically separated and purified. This magnetic liquid achieves a saturation magnetization of 92-95 emu / g, can operate for extended periods under high-temperature conditions, exhibits a 2-3 fold increase in thermal conductivity, and demonstrates excellent redispersibility. It solves the problems of low magnetic properties, easy failure at high temperatures, and poor dispersion stability of traditional magnetic fluids, making it suitable for extreme scenarios such as aerospace, high-end manufacturing, and ship propulsion.

The utility model relates to the technical field of production of nano composite materials, in particular to a device for producing PEG (Polyethylene Glycol) derivative modified superparamagnetic ferrite nano particles in a continuous flow manner. Comprising a PEG derivative ligand liquid storage tank, a superparamagnetic ferrite nanoparticle liquid storage tank, a washing liquid storage tank, a pH adjusting liquid storage tank, a metering pump, a static mixer, a tubular reactor, a constant temperature box, a centrifugal machine, a flow valve and a control module and is connected with a mixing part, a reaction part, a washing part and a centrifugal separation part through pipelines. And continuous flowing and automatic production of the materials are realized under the control of the control module.

The invention relates to the technical field of production of nano composite materials, in particular to a system and a method for preparing superparamagnetic ferrite nano particles by using a supercritical composite solvent. The system comprises a CO2 compression and liquefaction module, an ethanol pretreatment module, a metering pump, a precursor storage tank, a high-pressure pump, a preheater, a mixing reactor, a high-pressure reaction kettle, a temperature and pressure joint control module, an in-situ modification injection system, an online coating reactor, a supercritical decompression separator and a magnetic separation and purification module. The preparation method has the advantages that the requirements of magnetization intensity, hydrophilicity, particle size distribution, coating thickness and biocompatibility for preparing the hydrophilic superparamagnetic ferrite nano-particles are met, the hydrophilicity is simpler to realize, the particle size is more uniform to control, no organic residue exists, and the biological safety is higher.

It is described a continuous process for the production of ferrite nanoparticles having the surface functionalized with thermo-responsive polymeric moieties, useful in therapeutic and diagnostic applications in cancer therapy. An apparatus for carrying out the continuous process is also described.

The invention belongs to the technical field of biomedical materials, and discloses ferrite nanoparticles as well as a preparation method and application thereof. The preparation method of the ferrite nanoparticles comprises the following steps: S1, mixing a hafnium source, an iron source and triethylene glycol to obtain a mixed solution; s2, heating the mixed solution in an inert atmosphere to obtain a precursor solution; and S3, carrying out segmented heat treatment on the precursor solution, cooling, adding a precipitant, and collecting the precipitate to obtain the ferrite nanoparticles. According to the preparation method of the ferrite nanoparticles, accurate co-doping of hafnium-iron atoms in ferrite crystal lattices is realized; the nano-crystalline grains are controllable in defect, clear in grain boundary, uniform and controllable in size, good in dispersity and adjustable in element doping proportion; the nano-material system constructed by the nano-crystalline grains and albumin is uniform in size and good in biocompatibility; and a key material support is provided for developing a high-performance magnetic hyperthermia-image navigation-drug controlled release integrated nano diagnosis and treatment platform.

A magnetic nanofluid that includes magnetic transition metal ferrite nanoparticles, ferroelectric nanoparticles, and a carrier fluid, and a method of changing the temperature of an object (e.g., heating or cooling) using the magnetic nanofluid. The magnetic transition metal ferrite nanoparticles and ferroelectric nanoparticles can be present as a composite comprising both types of nanoparticles. The use of the magnetic nanofluid is associated with an increase in the Nusselt number in the presence of a magnetic field.

The invention belongs to the technical field of intelligent magnetic material preparation and low-temperature sealing environment application thereof, and particularly relates to a preparation method of high-performance magnetic liquid for a low-temperature sealing environment. The method comprises the following steps: (1) controllably doping different ions to prepare ferrite nanoparticles with high saturation magnetization at low temperature; (2) adjusting the pH value of the reaction liquid to change the zeta potential on the surface of the nano magnetic particles; (3) carrying out effective chemical coating on the particles by using oleic acid; and (4) uniformly dispersing the coated particles in low-temperature hydraulic oil to prepare the low-temperature-resistant magnetic liquid with high dispersion stability. The prepared magnetic liquid has a saturation magnetization value and fluidity which are obviously higher than those of conventional magnetic liquid at low temperature, and can be applied to the application fields of hydraulic mechanical sealing and low-temperature environment high-end sealing.