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Method for preparing CoNi nanoparticles

A nanoparticle, nickel nitrate technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high price, difficult operation, complicated preparation process, etc., and achieve low cost and repeatability. Good, high saturation magnetization effect

Active Publication Date: 2016-08-10
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there are also many problems in the above-mentioned method: most of the reaction samples selected by the preparation process are mostly volatile organic compounds, and most of the reaction raw materials are expensive organometallic salts, the preparation process is complicated and the operation is difficult, which limits The possibility of large-scale production using these methods

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  • Method for preparing CoNi nanoparticles
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Experimental program
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specific Embodiment approach

[0037] According to a preferred embodiment, the method of the present invention comprises:

[0038] (1) Dissolving cobalt nitrate and nickel nitrate in a solvent to form a solution A, then mixing the solution containing citric acid with the solution A to obtain a mixture sol;

[0039] (2) drying and expanding the mixture sol obtained in step (1) successively to obtain a CoNi nanoparticle precursor;

[0040] (3) in the presence of a protective gas, the CoNi nanoparticle precursor obtained in step (2) is subjected to a reduction reaction;

[0041] (4) performing annealing treatment on the product obtained after the reduction reaction described in step (3), and then grinding the product obtained after the annealing treatment.

[0042] In particular, the foregoing descriptions of the present invention are applicable to the preferred specific implementation manners of the present invention, and the present invention will not be repeated here.

[0043] Method of the present inventio...

Embodiment 1

[0052] Dissolve 0.1 mol of cobalt nitrate hexahydrate and 0.1 mol of nickel nitrate hexahydrate in 100 mL of water and stir until completely dissolved to obtain solution A, set aside;

[0053] Dissolve 0.15 mol of citric acid monohydrate in 40 mL of water and stir until completely dissolved, then mix the obtained solution with the above solution A and stir for 2 hours to obtain a wet sol;

[0054] The wet sol was dried in a drying oven at 80°C for 24 hours to obtain a xerogel; then the temperature of the drying oven was raised to 120°C and expanded for 6 hours to obtain a CoNi nanoparticle precursor;

[0055] The CoNi nanoparticle precursor is placed in a vacuum tube furnace, and the reduction reaction is carried out at 700 ° C for 1 h under an argon atmosphere;

[0056] The product obtained after the reduction reaction was annealed at a cooling rate of 3°C / min until the temperature was room temperature (25°C, the same below);

[0057] The product obtained after the annealing...

Embodiment 2

[0059] Dissolve 0.1 mol of cobalt nitrate hexahydrate and 0.09 mol of nickel nitrate hexahydrate in 100 mL of water and stir until completely dissolved to obtain solution A, set aside;

[0060] Dissolve 0.15 mol of citric acid monohydrate in 40 mL of water and stir until completely dissolved, then mix the obtained solution with the above solution A and stir for 2 hours to obtain a wet sol;

[0061] The wet sol was dried in a drying oven at 70°C for 26 hours to obtain a xerogel; then the temperature of the drying oven was raised to 150°C for 3 hours to obtain a CoNi nanoparticle precursor;

[0062] The CoNi nanoparticle precursor is placed in a vacuum tube furnace, and the reduction reaction is carried out at 750° C. for 0.5 h under an argon atmosphere;

[0063] The product obtained after the reduction reaction is annealed at a cooling rate of 3° C. / min until the temperature is room temperature;

[0064] The product obtained after the annealing treatment is naturally cooled to...

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Abstract

The invention relates to the field of nanometer materials, and discloses a method for preparing CoNi nanoparticles. The method comprises the following steps: (1) in the presence of solvent, cobalt nitrate, nickel nitrate and citric acid are mixed to obtain mixture sol; (2) the mixture sol obtained in the step (1) is dried and puffed in sequence to obtain a CoNi nanoparticle precursor; and (3) in the presence of protective gas, a reduction reaction is carried out on the CoNi nanoparticle precursor obtained in the step (2); and a product obtained after the reduction reaction is ground. The abovementioned method, provided by the invention, has the advantages of low cost and good repeatability; and the CoNi nanoparticles, prepared by the method, have relatively high saturation magnetization intensity.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a method for preparing CoNi nanoparticles. Background technique [0002] Nanomaterials are known as the foundation of materials science in the 21st century. The application of nanomaterials enables people to manufacture material devices at the atomic and molecular levels, triggering new revolutions and breakthroughs in the fields of materials, information, environment, energy, agriculture, and medical care. [0003] CoNi nanoparticles are magnetic nanoparticles, which have many applications in magnetic recording, medical treatment, chemical catalysis, and microwave absorption. However, the preparation of CoNi nanoparticles usually adopts the preparation method of organic metal salts, which makes the production cost high and the preparation process is too complicated, which greatly limits the industrial production of CoNi nanoparticles. Therefore, it is particularly important to cho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B22F1/00B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00B22F9/20B22F1/054
Inventor 李宝河王伟陈晓白俱海浪向萍萍
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY