12 results about "Ferrite nanoparticles" patented technology

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 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 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.

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.

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 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 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.