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Ceramic/graphene aerogel wave-absorbing material as well as preparation method and application thereof

A graphene aerogel, wave absorbing material technology, applied in ceramic products, applications, other household appliances, etc., can solve the problems of poor impedance matching, poor wave absorbing performance, difficult absorption of electromagnetic waves, etc., to achieve low cost, repeatability Good, environmentally friendly effect

Active Publication Date: 2022-08-05
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the dielectric constant of graphene is higher than that of air, the impedance matching is poor, making it difficult for most electromagnetic waves to be absorbed when incident on the surface of graphene, resulting in its poor absorbing performance.

Method used

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  • Ceramic/graphene aerogel wave-absorbing material as well as preparation method and application thereof
  • Ceramic/graphene aerogel wave-absorbing material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In step 1, 1 mol of Al(NO 3 ) 3 ·9H 2 O was dissolved in 500 mL of deionized water to obtain Al(NO) with a concentration of 2 mol / L 3 ) 3 solution, heating Al(NO 3 ) 3 The solution was brought to 75°C, and ammonia water was added dropwise with mechanical stirring until boehmite sol was formed; 1 mol LiNO 3 Dissolved in 500 mL of deionized water to obtain LiNO with a concentration of 2 mol / L 3 solution, the above LiNO 3 The solution was added to the boehmite sol and stirred at 300r / min for 2h to obtain a lithium-aluminum solution; take 400mg SiO 2 The sol was slowly added dropwise to the above lithium-aluminum solution and stirred at a speed of 300 r / min for 4 hours to obtain a lithium-aluminum-silica sol; the above-mentioned lithium-aluminum-silica sol was dried at 100 °C for 48 hours to obtain LAS precursor powder; the LAS precursor powder was heat-treated at 800 °C After 12h (the purpose is to remove nitrate and water), grind to obtain lithium aluminum silicon...

Embodiment 2

[0051] Step 1 is the same as Step 1 in Example 1.

[0052] Step 2: Weigh 2.0g of LAS powder, dissolve it in 30mL of deionized water, stir evenly, put it into an ultrasonic dispersing oscillator at room temperature for 30min to obtain a ceramic powder dispersion; weigh 2.5g of graphene oxide and put it in a beaker, add it to the beaker. Add 30mL of ceramic powder dispersion liquid to it, then dilute to 80mL, then put the beaker in the ultrasonic dispersion oscillator for 1h at room temperature, add 0.5g of urea CO (NH 2 ) 2 Stir until dissolved completely to obtain a mixed solution.

[0053] Step 3 is the same as Step 3 in Example 1. A nitrogen-doped modified lithium-aluminum-silicon / graphene composite material (N-LAS / rGO) is obtained, that is, a ceramic / graphene aerogel wave absorbing material.

Embodiment 3

[0055] Step 1 is the same as Step 1 in Example 1.

[0056] Step 2: Weigh 2.0g of LAS powder, dissolve it in 30mL of deionized water, stir evenly, put it into an ultrasonic dispersing oscillator at room temperature for 30min to obtain a ceramic powder dispersion; weigh 2.5g of graphene oxide and put it in a beaker, add it to the beaker. Add 30 mL of ceramic powder dispersion liquid to it, and then dilute it to 80 mL. After that, put the beaker in the ultrasonic dispersion oscillator for 1 hour at room temperature, and then add 1 g of urea CO (NH 2 ) 2 Stir until dissolved completely to obtain a mixed solution.

[0057] Step 3 is the same as Step 3 in Example 1. A nitrogen-doped modified lithium-aluminum-silicon / graphene composite material (N-LAS / rGO) is obtained, that is, a ceramic / graphene aerogel wave absorbing material.

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Abstract

The invention discloses a ceramic / graphene aerogel wave-absorbing material as well as a preparation method and application thereof, and relates to the technical field of functional materials. The ceramic / graphene aerogel wave-absorbing material comprises a graphene net-shaped structure which is formed by connecting graphene sheet layers in a staggered manner, wherein the graphene sheet layers contain N atoms which are doped and replace part of C atom positions; the lithium-aluminum-silicon ceramic particles are dispersed on the surface of the graphene net structure. The impedance matching performance of reduced graphene oxide is adjusted through lithium-aluminum-silicon ceramic, and the wave absorbing performance is effectively improved through the synergistic effect of conductivity loss and polarization loss; the method is good in repeatability, low in cost, environment-friendly, clean, non-toxic and easy for large-scale production, the structure and morphology of the synthesized ceramic / graphene aerogel wave-absorbing material are beneficial to electromagnetic wave absorption, and the composite electromagnetic wave-absorbing material is an ideal composite electromagnetic wave-absorbing material capable of being practically applied.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a ceramic / graphene aerogel wave absorbing material and a preparation method and application thereof. Background technique [0002] With the rapid development of information technology, especially microwave communication technology, electromagnetic radiation pollution in our environment has become a problem that cannot be ignored. It not only causes harm to human health, but also interferes with the operation of electronic equipment. At the same time, with the rapid development of modern electronic countermeasure technology, electromagnetic wave absorbing materials have attracted more and more attention from military scientists. Therefore, it is urgent to develop high-performance electromagnetic wave absorbing materials. [0003] At present, electromagnetic wave absorbing materials at home and abroad mainly include ceramic absorbing materials, carbon absorbing materi...

Claims

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Application Information

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IPC IPC(8): C04B38/10C04B30/00C09K3/00H05K9/00C04B111/40
CPCC04B30/00C09K3/00H05K9/0081C04B2111/00258C04B2111/40C04B14/024C04B14/045C04B38/10Y02E60/10
Inventor 夏龙安煜张嘉麒张星宇张瀚李天天王鑫宇
Owner HARBIN INST OF TECH AT WEIHAI
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