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TiO2-coated CoNi nanoparticle of york-shell structure and preparation method of nanoparticle

A technology of nano-microspheres and layer structure, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that are not suitable for nano-microspheres, achieve good magnetic and electrical properties, and structure Uniform distribution and good matching performance

Active Publication Date: 2018-02-09
承德中宇众航新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] A kind of Fe is disclosed in the prior art 3 o 4 C Preparation method of core-shell structure composite microspheres, which is not suitable for york-shell structure CoNi@TiO 2 Preparation of Nanospheres

Method used

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  • TiO2-coated CoNi nanoparticle of york-shell structure and preparation method of nanoparticle
  • TiO2-coated CoNi nanoparticle of york-shell structure and preparation method of nanoparticle
  • TiO2-coated CoNi nanoparticle of york-shell structure and preparation method of nanoparticle

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Embodiment 1

[0035] Such as Figure 1-8 As shown, a york-shell structure CoNi@TiO 2 Nano microspheres, including a CoNi alloy particle core structure, a shell structure and a hollow layer structure, the core structure is mainly a cobalt-nickel alloy composite material, the shell structure is mainly titanium dioxide, and the hollow layer structure is mainly alkali-treated The hollow structure formed after the silicon dioxide.

[0036] A york-shell structure CoNi@TiO 2 The preparation method of nano microsphere, comprises the steps:

[0037] Step 1, material preparation: prepare cobalt acetate, nickel acetate, sodium hydroxide and ethylene glycol solvent, wherein, the above-mentioned materials are used to prepare CoNi alloy particle core structure; prepare diethylenetriamine, isopropyl titanate and isopropyl titanate Propanol reaction solvent, wherein the above-mentioned materials are used to prepare the shell structure; ethanol, distilled water and ammonia water are prepared, wherein the...

Embodiment 2

[0048] In this example, in step 2, 0.5g of cobalt acetate and 2.0g of nickel acetate are added to 250g of ethylene glycol solution; 4.0g of sodium hydroxide is added to the mixed solution, and a mechanical stirrer is used under the condition of 720r / min Stir for 60 minutes to form a uniformly mixed dark green solution; transfer all the dark green solution to a PTFE-lined reaction kettle with a volume of 500mL, fill it with nitrogen and seal it, and place it in an oven; in the oven, the temperature is controlled at 200°C React for 12 hours. After the reaction is over, cool to room temperature, collect the gray-black solid phase by magnetic decantation, rinse 6 times with ethanol solution with a volume fraction of 95%, and dry to constant weight at 60°C in a vacuum drying oven; The gray-black powder that obtains carries out characteristic analysis, figure 2 The scanning photo of the cobalt-nickel alloy particle prepared for the present embodiment, Figure 4 XRD diffraction pat...

Embodiment 3

[0050] In this example, in step 2, 1.0 g of cobalt acetate and 4.0 g of nickel acetate are added to 250 g of ethylene glycol solution; 8.0 g of sodium hydroxide is added to the mixed solution, and a mechanical stirrer is used at 720 r / min Stir for 60 minutes to form a uniformly mixed dark green solution; transfer all the dark green solution to a PTFE-lined reaction kettle with a volume of 500mL, fill it with nitrogen and seal it, and place it in an oven; in the oven, the temperature is controlled at 200°C React for 12 hours. After the reaction is over, cool to room temperature, collect the gray-black solid phase by magnetic decantation, rinse 6 times with ethanol solution with a volume fraction of 95%, and dry to constant weight at 60°C in a vacuum drying oven; The obtained gray-black powder was analyzed for electromagnetic properties. Other than that, it was the same as in Example 1.

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Abstract

The invention discloses a TiO2-coated CoNi nanoparticle of a york-shell structure and a preparation method of the nanoparticle. The nanoparticle comprises a CoNi alloy particle nuclear structure, a shell layer structure and a hollow layer structure. The preparation method comprises the following steps: step 1, preparing raw materials for reaction; step 2, preparing the CoNi alloy particle nuclearstructure; step 3, injecting nitrogen into a reaction kettle, and then heating the reaction kettle by utilizing an oven; step 4, cooling, collecting solid phases, carrying out washing by utilizing ethanol, and carrying out vacuum drying; step 5, injecting nitrogen into a vacuum drying tank, and transferring a product into a solution acquired from the reaction among ethanol, distilled water and ammonium hydroxide; step 6, washing a reactant and drying the washed reactant; step 7, dissolving the above reactant in an isopropyl alcohol solvent; and step 8, adding powder acquired after the above reaction is finished into a sodium hydroxide solution. By adoption of the nanoparticle and the preparation method disclosed by the invention, the corrosion resistance and the microwave absorptivity of TiO2-coated CoNi are improved.

Description

technical field [0001] The invention relates to the technical field of microwave absorbing materials, in particular to a york-shell structure CoNi@TiO 2 Nanospheres and methods for their preparation. Background technique [0002] Among the traditional electromagnetic wave absorbing materials, ferrite and carbonyl iron powder are the most widely used. Although they have the advantages of strong wave absorbing performance and wide absorption frequency band, they have the defects of high density and easy corrosion, which limits their use. Application in stealth aircraft, ships and other weapons and equipment. As a typical nanomaterial, york-shell (core-shell structure) nano-microspheres not only have good electromagnetic wave absorption performance, but also have the advantages of low density, high stability and environmental corrosion resistance. The middle interlayer forms a hollow core-shell structure, and the obtained york-shell structure absorber is blended with other in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/07B22F1/16
Inventor 高志猛冯建杰刘敏
Owner 承德中宇众航新材料有限公司
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