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Method for preparing dielectric adjustable three-dimensional graded nanocapsule wave absorbing material

A technology of nanocapsules and absorbing materials, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as performance limitation of single-shell layer, difficulty in preparation of double-shell layer, compatibility of composite materials, etc. , to achieve the effect of improving microwave magnetic loss, promoting anisotropic growth and short production cycle

Active Publication Date: 2020-06-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microwave dielectric loss control of the dielectric shell also has problems such as the performance limitation of the single shell, the difficulty in preparing the double shell, and the compatibility of composite materials. It is difficult to form effective electromagnetic coordination with the magnetic core, which is also the key point to solve the impedance modulation.

Method used

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  • Method for preparing dielectric adjustable three-dimensional graded nanocapsule wave absorbing material
  • Method for preparing dielectric adjustable three-dimensional graded nanocapsule wave absorbing material
  • Method for preparing dielectric adjustable three-dimensional graded nanocapsule wave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Dissolve 3 mmol of nickel acetate tetrahydrate and 1 g of polyethylene glycol 4000 in 20 mL of ethylene glycol, and stir magnetically at 80 ° C for 20 min until completely dissolved to obtain a clear solution 1;

[0050] 2. Add 0.045mol of sodium hydroxide to 10mL of ethylene glycol, and stir with magnetic force at 80°C for 20min until completely dissolved to obtain a clear solution 2;

[0051] 3. Fully mix solution 1 and solution 2 and stir evenly, transfer to a 50ml polytetrafluoroethylene reactor lining, and put it into a stainless steel shell, react at 200°C for 8 hours, take it out after cooling to room temperature, and remove the product Use a magnetic field to separate out, and use distilled water and absolute ethanol to wash 3 times respectively, obtain the Ni hierarchical nano core;

[0052] 4. Redisperse the graded nano-Ni obtained in step 3 into deionized water, add 1g of polyvinylpyrrolidone (PVP) for ultrasonication and disperse evenly;

[0053] 5. Use ...

Embodiment 2

[0059] 1. Dissolve 3 mmol of nickel acetate tetrahydrate and 1 g of polyethylene glycol 4000 in 20 mL of ethylene glycol, and stir magnetically at 80 ° C for 20 min until completely dissolved to obtain a clear solution 1;

[0060] 2. Add 0.045mol flaky sodium hydroxide to 10mL ethylene glycol, and stir magnetically at 80°C for 20min until it is completely dissolved to obtain a clear solution 2;

[0061] 3. Fully mix solution 1 and solution 2 and stir evenly, transfer to a 50ml polytetrafluoroethylene reactor lining, and put it into a stainless steel shell, react at 200°C for 8 hours, take it out after cooling to room temperature, and remove the product Use a magnetic field to separate out, and use distilled water and absolute ethanol to wash 3 times respectively, obtain the Ni hierarchical nano core;

[0062] 4. Redisperse the graded nano-Ni obtained in step 3 into deionized water, add 1g of polyvinylpyrrolidone (PVP) for ultrasonication and disperse evenly;

[0063] 5. Use a...

Embodiment 3

[0069] 1. Dissolve 3 mmol of nickel acetate tetrahydrate and 1 g of polyethylene glycol 4000 in 20 mL of ethylene glycol, and stir magnetically at 80 ° C for 20 min until completely dissolved to obtain a clear solution 1;

[0070] 2. Add 0.045mol flaky sodium hydroxide to 10mL ethylene glycol, and stir magnetically at 80°C for 20min until it is completely dissolved to obtain a clear solution 2;

[0071] 3. Fully mix solution 1 and solution 2 and stir evenly, transfer to a 50ml polytetrafluoroethylene reactor lining, and put it into a stainless steel shell, react at 200°C for 8 hours, take it out after cooling to room temperature, and remove the product Use a magnetic field to separate out, and use distilled water and absolute ethanol to wash 3 times respectively, obtain the Ni hierarchical nano core;

[0072] 4. Redisperse the graded nano-Ni obtained in step 3 into deionized water, add 1g of polyvinylpyrrolidone (PVP) for ultrasonication and disperse evenly;

[0073] 5. Use a...

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Abstract

The invention discloses a method for preparing a dielectric adjustable three-dimensional graded nanocapsule wave absorbing material. Nickel salt is reduced through a one-step polyhydric alcohol solvothermal method, a three-dimensional graded nano structure formed by nickel (Ni) nanosheets through random crossing is prepared, then the surface of a magnetic graded Ni core is covered with a polystyrene (PS) shell layer embedded and decorated by graphene quantum dots (GQDs) through in-situ polymerization, and therefore the Ni / GQDs / PS three-dimensional graded nanocapsule wave absorbing material isobtained. According to the method, the multiple scattering and microwave magnetic conductivity of a face easy to magnetize is improved through the geometric effect and anisotropism of a Ni graded structure, and three-dimensional magnetic loss enhancement is achieved. The graded Ni core-coated GQDs / PS shell layer is compounded through polar and nonpolar materials, the microwave dielectric constantcan be adjusted, and dielectric loss, impedance matching and the absorption frequency band are modulated accordingly; and meanwhile, Ni core oxidization is effectively avoided, and the adjustable waveabsorption performance of the material is achieved.

Description

technical field [0001] The invention relates to a method for preparing a composite wave-absorbing material with adjustable performance, in particular to a method for preparing a dielectrically adjustable three-dimensional graded nanocapsule wave-absorbing material, which belongs to the field of wave-absorbing functional materials. Background technique [0002] With the miniaturization and high-frequency development of electronic devices, electromagnetic interference and electromagnetic radiation have seriously affected social production and human health. Electromagnetic shielding and electromagnetic absorption have therefore become hot issues in civilian and military related fields. In the past ten years, ferromagnetic metals and alloys have become a research hotspot in the field of microwave-absorbing materials due to their high saturation magnetization, small hysteresis coefficient, and high microwave permeability. However, with the improvement of electromagnetic compatibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02B22F1/00H01Q17/00B82Y30/00B82Y40/00
CPCB22F9/24H01Q17/00B82Y30/00B82Y40/00B22F1/0551B22F1/0553B22F1/07B22F1/054B22F1/16
Inventor 汪嘉恒吕楠吴玉程张勇鲍智勇
Owner HEFEI UNIV OF TECH
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