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Preparation method of magnetic nanometer particles with adjustable and controllable particle diameter

A technology of magnetic nanoparticles and particle size, applied in the direction of magnetism of inorganic materials, can solve the problems of uncontrollable decomposition rate of metal precursors, unfavorable promotion and application, and failure to achieve, and achieves good application prospects and high regulation accuracy.

Active Publication Date: 2015-04-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these control methods usually need to change a lot of preparation process conditions, which is not conducive to popularization and application; moreover, the control precision that these control methods can achieve is above 1-2nm. For the particle size control precision below 1nm, due to the metal precursor The rate of decomposition was uncontrollable and failed to achieve

Method used

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  • Preparation method of magnetic nanometer particles with adjustable and controllable particle diameter
  • Preparation method of magnetic nanometer particles with adjustable and controllable particle diameter
  • Preparation method of magnetic nanometer particles with adjustable and controllable particle diameter

Examples

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Effect test

Embodiment 1

[0038]Mix 250ul carbonyl iron and 0.75ml oleylamine E1 in an Ar atmosphere, obtain a uniformly mixed viscous liquid under magnetic stirring, raise the temperature to 30°C, and keep it for 1h to obtain a viscous complex reaction mixture of carbonyl iron and oleylamine A1. At the same time, 198 mg of platinum acetylacetonate was dispersed in dibenzyl ether, 3.75 ml of oleic acid and 3 ml of oleylamine E2 were added, and the mixed solution B1 was obtained by ultrasonication for 10 min. Next, add the B1 solution to the A1 viscous liquid, raise the temperature to 250°C at a rate of 5°C / min under magnetic stirring, and reflux at this temperature for 1 hour. Remove heat source and cool to room temperature naturally. The whole process has been carried out under the protection of inert gas. The obtained product is centrifuged with ethanol at a speed of 6000 rpm or more for a centrifugation time of more than 10 minutes to obtain magnetic nano FePt particles, which are dispersed in non...

Embodiment 2

[0041] Mix 250ul carbonyl iron and 2.25ml oleylamine E1 in an Ar atmosphere, obtain a uniformly mixed viscous liquid under magnetic stirring, raise the temperature to 30°C, and keep it for 1h to obtain a viscous complex reaction of carbonyl iron and oleylamine Mix A2. At the same time, 198 mg of platinum acetylacetonate was dispersed in dibenzyl ether, 3.75 ml of oleic acid and 1.5 ml of oleylamine E2 were added, and the mixed solution B2 was obtained by ultrasonication for 10 min. Next, add the B2 solution into the A2 viscous liquid, raise the temperature to 250° C. at a rate of 5° C. / min under the condition of magnetic stirring, and reflux at this temperature for 1 hour. Remove heat source and cool to room temperature naturally. The whole process has been carried out under the protection of inert gas. The obtained product is centrifuged with ethanol at a speed of 6000 rpm or more for a centrifugation time of more than 10 minutes to obtain magnetic nano FePt particles, whic...

Embodiment 3

[0044] Mix 250ul carbonyl iron and 3ml oleylamine E1 in an Ar atmosphere, obtain a uniformly mixed viscous liquid under magnetic stirring, raise the temperature to 30°C, and keep it for 1h to obtain a viscous carbonyl iron and oleylamine complex reaction mixture A3. At the same time, 198 mg of platinum acetylacetonate was dispersed in dibenzyl ether, 3.75 ml of oleic acid and 0.75 ml of oleylamine E2 were added, and the mixed solution B3 was obtained by ultrasonication for 10 min. Next, add the B3 solution to the A3 viscous liquid, raise the temperature up to 250°C at a rate of 5°C / min under the condition of magnetic stirring, and reflux at this temperature for 1 hour. Remove heat source and cool to room temperature naturally. The whole process has been carried out under the protection of inert gas. The obtained product is centrifuged with ethanol at a speed of 6000 rpm or more for a centrifugation time of more than 10 minutes to obtain magnetic nano FePt particles, which ar...

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Abstract

The invention provides a preparation method of magnetic nanometer particles with the adjustable and controllable particle diameter. According to the preparation method, a chemical thermal decomposition method is adopted, firstly, organic substances and partial or all metal precursors are mixed to take complex reaction so that at least partial metal precursors take the complex reaction with the organic substances, the decomposition speed of the partial metal precursors in the subsequent chemical thermal decomposition reaction is changed, then, mixed solution subjected to the complex reaction is mixed with reaction solvents, the rest metal precursors and surface active agents to form a reaction system, the temperature of the reaction system is raised for carrying out the chemical thermal decomposition reaction, the constant-temperature maintaining and the centrifugal separation are carried out after the reaction, and the magnetic nanometer particles are obtained. The method has the advantages that only the consumption of the organic substances participating in the complex reaction needs to be regulated, other reaction conditions are maintained unchanged, the regulation and the control of the particle diameter of the magnetic nanometer particles can be realized, and in addition, the regulation and control range can reach 0.5nm, so the invention belongs to the preparation method of the magnetic nanometer particles with the adjustable and controllable particle diameter, and good application prospects are realized.

Description

technical field [0001] The invention relates to the technical field of preparation of magnetic nanoparticles, and in particular provides a method for preparing magnetic nanoparticles whose particle size can be regulated, and the control range of the particle size can reach 0.5nm. Background technique [0002] Typical applications of magnetic nanoparticles include magnetic recording, magnetic separation technology (such as sewage treatment), magnetic fluids, permanent magnets, and biomedicine. [0003] There are many methods for preparing magnetic nanoparticles, mainly physical and chemical methods. Physical methods include vacuum condensation method, ball milling method, and physical pulverization method. Although these methods are easy to produce in large quantities, the prepared nanoparticles have disadvantages such as large particle size distribution range, low purity and easy oxidation, which are difficult to apply to such as Special fields such as biomedicine. Chemica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/01B22F9/30
Inventor 杜娟边宝茹张健夏卫星
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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