Nickel-cobalt hollow composite particle as well as preparation method and application thereof

A composite particle, nickel-cobalt technology, applied in the field of wave absorbing materials, can solve the problems of unsuitable engineering application, unable to prepare metal hollow core-shell structure, low absorption rate, etc.

Pending Publication Date: 2021-06-25
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] "Construction of a variety of inorganic hollow microspheres and their properties by carbon template method", "Preparation, Microstructure and Properties of Core-Shell and Hollow Structure Nanomaterials" and other related literature reports by using an easily eliminated inorganic oxide SiO 2 As an intermediate transition layer, and its surface is coated with a dielectric layer with dielectric loss, and then the SiO is treated by an alkaline solution 2 Hollow core-shell structure composite particles are finally obtained, but this method cannot be used on inorganic oxides SiO 2 The surface is coated with a metal layer, and the metal hollow core-shell structure cannot be prepared, and the reaction conditions of this method are strict, and it is not suitable for engineering applications; the Chinese patent with the publication number CN105502513A discloses a hollow ferroferric oxide wave-absorbing material. Preparation method, this method prepares hollow iron ferric oxide by high temperature reaction kettle, the iron ferric oxide prepared by this method has high density, low absorption rate, poor temperature stability, and the magnetic permeability and dielectric constant in the microwave section are small

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  • Nickel-cobalt hollow composite particle as well as preparation method and application thereof
  • Nickel-cobalt hollow composite particle as well as preparation method and application thereof
  • Nickel-cobalt hollow composite particle as well as preparation method and application thereof

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preparation example Construction

[0026] In view of the problems in the prior art that the density of wave-absorbing materials is high or the preparation method is not suitable for industrialization, this application provides a preparation method of nickel-cobalt hollow composite particles, the specific process is as follows figure 1 As shown, the nickel-cobalt hollow composite particles prepared by this method have low density, high magnetic permeability, high magnetic saturation strength, good dispersion, high specific surface area, high surface activity, and strong surface permeability due to their special structure. Good stability, as a wave-absorbing material, it has the advantages of high absorption effect, wide frequency band and superparamagnetism. Specifically, the preparation method of nickel-cobalt hollow composite particles described in the present application includes the following steps:

[0027] A) mixing nickel salt, cobalt salt and water to obtain a mixed solution; mixing the mixed solution wi...

Embodiment 1

[0041] 40 parts containing Ni 2+ and Co 2+ The main salt (nickel sulfate and cobalt sulfate) was added to 800 parts of deionized water, and stirred evenly at a low speed of 80r / min for 5min in a water bath at 50°C, wherein Ni 2+ :Co 2+ The molar ratio is 1:4; add 10 parts of alkali solution of sodium hydroxide with a concentration of 1mol / L to the mixed solution and stir rapidly at a speed of 1000r / min for 20min to form colloidal particles, then add 2 parts of stabilizer to prevent colloidal Decompose and stir slowly for 5 minutes to complete the preparation of the colloidal solution;

[0042] Add 6 parts of reducing agent sodium hypophosphite to the colloidal solution and stir rapidly in a water bath at 80°C at a speed of 600r / min until bubbles appear, and the reaction starts. After 6 minutes of the reaction, add 15 parts of hypophosphite to the reaction system Mixing agent disodium ethylenediaminetetraacetic acid (EDTA), so that the complexing agent can be mixed with Co(O...

Embodiment 2

[0045] 50 parts containing Ni 2+ and Co 2+ The main salt (nickel sulfate and cobalt sulfate) was added to 600 parts of deionized water, and stirred evenly at a low speed of 80r / min for 5min in a water bath at 50°C, wherein Ni 2+ :Co 2+ The molar ratio is 1:2; 20 parts of alkali solution of sodium hydroxide with a concentration of 1.5mol / L is added to the mixed solution and stirred rapidly at a speed of 1000r / min for 25min to form colloidal particles, and then 4 parts of stabilizer are added to prevent The colloid was decomposed and stirred slowly for 8 minutes to complete the preparation of the colloidal solution;

[0046] Add 10 parts of reducing agent sodium hypophosphite to the colloidal solution, stir rapidly in a water bath at 80°C at a speed of 800r / min until bubbles appear, and the reaction starts. After 8 minutes after the reaction starts, add 20 parts of hypophosphite to the reaction system. Mixing agent disodium ethylenediaminetetraacetic acid (EDTA), so that the ...

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Abstract

The invention provides a preparation method of nickel-cobalt hollow composite particles, which comprises the steps of A) mixing nickel salt, cobalt salt and water to obtain a mixed solution, and mixing the mixed solution with alkali liquor to obtain a colloidal solution; and B) mixing the colloidal solution with a first reducing agent,reacting, then adding a complexing agent to enable the complexing agent to perform substance exchange with Co (OH) 2 and Ni (OH) 2 in the colloidal solution, then adding a second reducing agent to react, and separating to obtain the nickel-cobalt hollow composite particles. The invention further provides the nickel-cobalt hollow composite particles prepared through the method and application of the nickel-cobalt hollow composite particles. The prepared cobalt-nickel hollow composite particles have the advantages of being low in density, good in dispersity, high in specific surface area, high in surface activity, high in surface permeability, good in stability, good in absorption effect, wide in frequency band, superparamagnetic and the like.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to nickel-cobalt hollow composite particles, a preparation method and application thereof. Background technique [0002] In recent years, with the development of microwave technology, the interference and harm caused by electromagnetic waves have become more and more serious. Therefore, with the development and wide application of electronic technology, electromagnetic interference and radiation have gradually attracted people's attention, and excellent electromagnetic wave absorbers have attracted people's attention. [0003] Magnetic metal materials such as cobalt, nickel and their alloys have good application prospects because of their high magnetic saturation strength, high magnetic permeability, good thermal stability and good absorption performance. Among them, magnetic nickel-cobalt alloy nanomaterials have special surface magnetism and catalytic functions, ...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G51/00H01Q17/00H05K9/00
CPCC01G53/006C01G51/006H01Q17/007H05K9/0075Y02E60/10
Inventor 刘若鹏赵治亚刘志礼
Owner LUOYANG INST OF CUTTING EDGE TECH
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