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Composite wave-absorbing material and preparation method and application thereof

A composite wave-absorbing material and reaction technology, applied in the field of wave-absorbing materials, to achieve the effect of improving wave-absorbing performance, simple preparation process, and easy control

Active Publication Date: 2021-02-09
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a new composite system absorbing material, which is composed of hollow porous structure ZnO microspheres loaded with rare earth oxide nanoparticles with electromagnetic radiation absorption performance , in order to overcome the use defects of the current ZnO single-component absorbing material itself

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  • Composite wave-absorbing material and preparation method and application thereof
  • Composite wave-absorbing material and preparation method and application thereof
  • Composite wave-absorbing material and preparation method and application thereof

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preparation example Construction

[0056] An embodiment of the present invention proposes a method for preparing a composite wave-absorbing material, comprising the following steps:

[0057] 1), preparing ZnO microspheres with hollow porous structure;

[0058] 2) Add the aqueous solution of rare earth acetate to ethanol / water mixed solvent, mix, add urea, the above-mentioned ZnO microspheres with hollow porous structure, ultrasonication, and react. The obtained product is centrifuged, washed, dried, and calcined to obtain ZnO loading Rare earth oxide composite absorbing material.

[0059] In one embodiment of the present invention, step 1) is specifically: dissolving zinc acetate and glucose in water, cooling to room temperature after hydrothermal reaction, centrifuging the product, washing, drying, and calcining to obtain ZnO microspheres with a hollow porous structure .

[0060] Specifically, in step 1), the reaction temperature is 160-180° C.; the reaction time is 4-6 hours.

[0061] Specifically, in step...

Embodiment 1

[0073] Embodiment 1: hollow porous structure ZnO microsphere-gadolinium oxide nanoparticles (ZnO / Gd 2 o 3 ) preparation of composite absorbing material

[0074] Step (1): Preparation of hollow porous structure ZnO microspheres:

[0075] Dissolve 1.0g of zinc acetate and 2.5g of glucose in 30mL of deionized water, and stir well to form a uniform and transparent solution. Then transferred to a 50mL reactor and reacted at 160°C for 4h. After the reaction, cool to room temperature, centrifuge to obtain the product zinc / carbon composite microspheres, wash with deionized water and absolute ethanol, and dry at 80° C. for 8 hours. Finally, the sample was calcined in an air atmosphere at 600°C for 4 hours to obtain hollow porous ZnO microspheres with a microstructure such as figure 1 shown.

[0076] Step (2): Add 2mL 0.5mol / L gadolinium acetate aqueous solution to 20mL ethanol-water mixed solvent (the volume ratio of ethanol to water is 1:1), and add 0.1g urea to the above solutio...

Embodiment 2

[0079] Embodiment 2: hollow porous structure ZnO microspheres-gadolinium oxide nanoparticles (ZnO / Gd 2 o 3 ) preparation of composite absorbing material

[0080] Step (1) is the same as in Example 1, and step (2) adopts the production process of step (2) in Example 1. The difference from step (2) in Example 1 is that the addition of urea is increased to 0.5g. Get ZnO / Gd 2 o 3 Composite absorbing material, the product appearance is as follows Figure 5 shown.

[0081] With embodiment 2 gained ZnO / Gd 2 o 3 The composite absorbing material is evenly dispersed in paraffin (mass fraction is 50%), and the mixture is pressed into thin slices with an inner diameter of 3.0mm, an outer diameter of 7.0mm, and a thickness of 2.5-5mm, and the wave absorption is carried out using an Agilent N5230A vector network analyzer. Performance Testing. Image 6 is ZnO / Gd 2 o 3 The reflection loss curve of the composite absorbing material in the range of 2-18GHz, it can be seen from the figu...

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Abstract

The invention provides a composite wave absorbing material and a preparation method and application thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The composite wave-absorbing material has a heterostructure formed by zinc oxide and rare earth oxide, zinc oxide (ZnO) microspheres with hollow porous structures are used as base materials, rare earth oxide nanoparticles are loaded on the surfaces of the zinc oxide (ZnO) microspheres, and a novel efficient composite structure electromagnetic wave absorption attenuator with magnetic loss and dielectric lossaction characteristics is constructed. The rare earth oxide can be gadolinium oxide, lanthanum oxide, cerium oxide or samarium oxide. The material has good impedance matching and strong attenuation capability under the synergistic effect of a hollow porous structure, a dual-loss mechanism and various components, and can be used as a wave-absorbing material in the field of electromagnetic wave absorption attenuation.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a composite wave-absorbing material and its preparation method and application. Background technique [0002] Various mobile communication devices, household appliances, and electronic devices will produce electromagnetic radiation of different wavelengths and frequencies during use, which is potentially harmful to human health. The research and development of absorbing materials is an important means to prevent and control electromagnetic radiation pollution, and has received great attention from researchers from all over the world. [0003] ZnO is a dielectric loss absorbing material with a relatively high dielectric loss angle and better thermal stability than metal absorbers. It has the characteristics of rich nanostructure, light weight, excellent semiconductor performance, and easy mass production. Absorbs electromagnetic waves in specific frequency bands,...

Claims

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Application Information

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IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 乔儒童国秀聂志颖和子栋朱兰兰
Owner ZHEJIANG NORMAL UNIVERSITY
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