23 results about "Ferrite nanoparticles" patented technology

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 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.

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 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.

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 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.

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.

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.

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.

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 invention relates to the technical field of production of nano composite materials, in particular to equipment and a method for preparing superparamagnetic iron oxide nano particles with uniform temperature control. Comprising a thermocouple series layered thermoelectric module, a stainless steel cylindrical reaction kettle, a flexible heat-conducting gasket, a temperature sensor, an aluminum oxide ceramic isolation layer, a stirrer, a supporting and transmission device, a numerical control pulse power supply and a control module, when the superparamagnetic ferrite nano-particles are prepared, the temperature uniformity is ensured while the temperature rise rate is met in the temperature rise process, and the requirements for particle size distribution width, particle shape and dispersity control and large-scale requirements are met when the superparamagnetic ferrite nano-particles are prepared through high-temperature thermal decomposition.

The utility model relates to the technical field of production of nano composite materials, in particular to a feeding device for preparing superparamagnetic ferrite nano particles through high-temperature thermal decomposition. Comprising a powder material feeding module, a liquid material feeding module, a powder material quantitative container, a liquid material quantitative container, a material level information acquisition module, a liquid level information acquisition module, an electric scraper mechanism, a three-degree-of-freedom mechanical arm, an inclined diversion trench, a material collector, a reaction kettle and a control module, different requirements of different material systems on weighing equipment can be avoided, the control precision requirements of automatic feeding, weighing and excess are reduced, the response speed is high, and implementation is convenient.

A ferrite nano-composites with synergistic enhancement of liver specificity and preparation method and application thereof, wherein the ferrite nano-composites have both manganese ions and ethoxybenzyl group, and the molar percentage of ethoxybenzyl group to manganese ions is 25-60%. The molar percentages of manganese and ferric ions in the ferrite nanoparticles are 40-80%, and the ferrite nano-composites with manganese ions and ethoxybenzyl groups on the surface are in the particle size range of 0.2-5 nm, with preferred particle size range of 2-4 nm. With the preparation method and the application for magnetic resonance T1 imaging, the ferrite nano-composites enhance hepatocyte specificity due to the synergistic effect of manganese ions and ethoxybenzyl groups, thus achieving enhanced T1 imaging of the liver with high specificity in magnetic resonance imaging.

A method for preparing ferrite nanoparticles employing as directing agent an aldehyde or ketone of formula R1—(C═O)R2 is provided. R1 is a linear or branched, saturated or unsaturated carbon chain having a length between 1 and 13 carbon atoms, optionally substituted with an aromatic substituent. R2 is selected from the group consisting of hydrogen, an aromatic ring and a linear or branched, saturated or unsaturated carbon chain having a length between 1 and 10 carbon atoms. When R2 is hydrogen and R1 is an unsaturated carbon chain substituted with an aromatic substituent, the aromatic substituent is located at position 3 or higher with respect to the carbonyl group —(C═O). When R2 is hydrogen and R1 is a saturated carbon chain substituted with an aromatic substituent, the aromatic substituent is located at position 2 or higher with respect to the carbonyl group —(C═O). When the aromatic substituent is located at position 2, the aromatic substituent is the sole substituent at position 2.

This invention provides a magnetic metal oxide, its preparation method, and its application in tumor treatment, relating to the field of novel material preparation. The magnetic metal oxide comprises spinel-type ferrite nanoparticles of the general formula MFe₂O₄, wherein M is one or a combination of two of Mn, Co, and Zn. The magnetic metal oxide is obtained by calcining nano-MFE₂O₄ material in a reducing atmosphere and magnetizing it in a magnetic field, and exhibits a nanospherical structure. By improving magnetic properties without introducing additional functional components, the resulting magnetic metal oxide demonstrates enhanced thermal conversion efficiency in magnetothermal therapy, improved driving response capability in magnetically controlled nanorobots, and enhanced magnetic positioning performance in embolized microspheres, thereby better meeting its application requirements in the field of tumor treatment.

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.

This invention relates to the field of plastic modification and processing technology, and in particular to a high-conductivity composite system coated with black talc powder, its preparation method, and a modified masterbatch containing the black talc powder and its preparation method. The mass percentage composition is as follows: high-conductivity composite system coated with black talc powder 65.0–76.0 wt.%, cobalt ferrite nanoparticles 5.0–10.0 wt.%, carrier resin 15.0–20.0 wt.%, dispersant 2.0–3.0 wt.%, lubricant 0.5–1.0 wt.%. Through the technology of this invention, black talc powder is transformed from a general traditional inorganic filler into a high-end functional filler with conductive functional modification effects, thereby increasing the added value of black talc powder products and making an important contribution to the development and application of black talc powder mines in my country.