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Superfine high-dispersion super-paramagnetism ferrate nano particles and preparation method thereof

A nanoparticle and superparamagnetic technology, which is applied in the field of ultrafine and highly dispersed superparamagnetic ferrite nanoparticles and its preparation, can solve the problems of high synthesis temperature and high cost of raw materials, and achieve low reaction temperature, simple operation, small size Narrow distribution effect

Inactive Publication Date: 2012-07-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of raw materials used in this method is high, the synthesis temperature is high, and a large amount of organic raw materials are introduced into the reaction system to control the size of nanoparticles

Method used

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  • Superfine high-dispersion super-paramagnetism ferrate nano particles and preparation method thereof
  • Superfine high-dispersion super-paramagnetism ferrate nano particles and preparation method thereof
  • Superfine high-dispersion super-paramagnetism ferrate nano particles and preparation method thereof

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Embodiment 1

[0032] Below further illustrate the present invention by embodiment:

[0033] First, the anhydrous FeCl 3 (1.13g) and MgCl 2 (0.075g) was dissolved in absolute ethanol (70ml) to be configured as an ethanol solution of ferric chloride and magnesium chloride, and under magnetic stirring, 2mL of oleic acid was added to the ethanol solution. Then the 10mL NaOH ethanol solution that will configure is joined in the ethanol solution of ferric chloride and magnesium chloride (the addition of sodium hydroxide=the valence state of metal ion×the addition of metal chloride, two kinds of metal ions Mg 2+ with Fe 3+ Total after calculation respectively), fully mixed for 1 h under the action of magnetic stirring, and then introduced into a polytetrafluoroethylene reactor for solvothermal reaction. The temperature of the solvothermal reaction is 150 ° C, and the solvothermal time is 2 h. After the mixed solution was cooled to room temperature (25°C), it was centrifuged and ultrasonically w...

Embodiment 2

[0039] The difference from Example 1 is that the method provided by the present invention is used to prepare ultrafine and highly dispersed superparamagnetic zinc ferrite nanoparticles, and the product particles are characterized by transmission electron microscopy. The product particles are completely crystallized, spherical, highly dispersed, and the average particle size is about 5.9nm, cubic spinel Zn with uniform size distribution 0.45 Fe 2.37 o 4 Nanoparticles have a saturation magnetization of 29.3emu / g under an applied magnetic field at a temperature of 300K and a magnetic induction of 1T, and are suitable for biomedical applications including cell labeling, hyperthermia, and magnetic resonance imaging.

Embodiment 3

[0041] The difference from Example 1 is that the method provided by the present invention is used to prepare ultrafine and highly dispersed superparamagnetic manganese ferrite nanoparticles, and the product particles characterized by transmission electron microscopy are completely crystallized, spherical, highly dispersed, and the average particle size is about 3.5nm, cubic spinel structure Mn with uniform size distribution 0.11 Fe 2.52 o 4 Nanoparticles have a saturation magnetization of 57emu / g under an applied magnetic field at a temperature of 300K and a magnetic induction of 1T, and are suitable for biomedical applications including cell labeling, hyperthermia, and magnetic resonance imaging.

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Abstract

The invention belongs to the technical field of nano magnetic materials, and particularly relates to superfine high-dispersion super-paramagnetism ferrate nano particles and a preparation method thereof. The nano particles are apparently high-dispersion spherical particles, the average particle size is a few nanometers, and the nano particles are uniform in size distribution, and each particle has a cubic spinel structure. Anhydrous metal chloride, ethanol, oleic acid and sodium hydroxide are used as reactive raw materials, and are subjected to solvent thermal reaction to obtain pure crystallized nano ferrite powder. According to the preparation method, NaCl crystals which are automatically generated through reaction at room temperature are coated on nano-crystals, so that the nano-crystals are restricted to continuously grow up during solvent thermal reaction. Moreover, the aim of dispersing the nano particles is fulfilled by using a steric hindrance of the oleic acid to the nano particles; and the saturation magnetization of a product is changed by using different proportions of doping ions and iron ions in the raw materials. The superfine high-dispersion super-paramagnetism ferrate nano particles are suitable for biomedical application such as cell marking, heat treatment, magnetic resonance imaging and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer magnetic materials, and in particular relates to an ultrafine highly dispersed superparamagnetic ferrite nanoparticle and a preparation method thereof. Background technique [0002] Metal ferrites are important functional materials, which are mainly used in the fields of catalysis, environmental engineering, biomedicine, clinical diagnosis and information storage and processing. Due to the superparamagnetism of ultrafine ferrite nanoparticles, people's interest is more focused on the application in the field of biomedicine, such as high gradient magnetic separation technology, magnetic drug targeting technology, magnetic superheating therapy, magnetic resonance imaging contrast technology, etc. . [0003] In the spinel magnesium ferrite lattice, there is Mg 2+ and Fe 3+ two ions. They occupy the oxygen octahedral center B and the oxygen tetrahedral center A, if "A" is indicated by parenthese...

Claims

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Application Information

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IPC IPC(8): C01G49/00H01F1/047B82Y40/00
Inventor 唐文书李琦高世安尚建库
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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