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Graphene dielectric constant regulation method
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A kind of ene dielectric and constant technology, applied in chemical instruments and methods, other chemical processes, etc., to achieve excellent microwave absorption performance, excellent microwave absorption performance, and reduce the effect of dielectric constant
Pending Publication Date: 2021-03-16
HARBIN INST OF TECH AT WEIHAI +1
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In addition, lithium aluminum silicon (LAS) also has an ultra-low dielectric constant, but there is no research on improving the microwave absorption performance by adjusting the dielectric constant of graphene through lithium aluminum silicon (LAS)
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Embodiment 1
[0028] In the first step, dissolve 0.003mol of aluminum nitrate in 15mL of water (2mol / L), heat to 75°C, and add ammonia water dropwise with mechanical stirring until it stops stirring. 0.003mol LiNO 3 Dissolve in 15mL water (2mol / L), add to the sol, and stir rapidly to obtain a lithium aluminum solution. Take 1.2g SiO 2 The sol was slowly added dropwise to the lithium-aluminum solution, the stirring speed was increased, and the stirring was continued for 4 hours to obtain the lithium-aluminum-silica sol A.
[0029] In the second step, add 1.5mL of silanecoupling agent KH-550, add 6.376mL of absolute ethanol, and finally add 1.5mL of deionized water, and stir for 30min to obtain solution B.
[0030] In the third step, sol A was added to solution B, heated to 70°C, and stirred for 30 minutes to obtain solution C. Add 0.186g graphene oxide and 50mL absolute ethanol, continue to stir for 1h, obtain solution D.
[0031] In the fourth step, put solution D into a 80mL autoclave...
Embodiment 2
[0034] In the first step, dissolve 0.003mol of aluminum nitrate in 15mL of water (2mol / L), heat to 75°C, and add ammonia water dropwise with mechanical stirring, until it cannot be stirred, 0.003mol of LiNO 3 Dissolve in 15mL water (2mol / L), add to the sol, and stir rapidly to obtain a lithium aluminum solution. Take 1.2g SiO 2 The sol was slowly added dropwise to the lithium-aluminum solution, the stirring speed was increased, and the stirring was continued for 4 hours to obtain the lithium-aluminum-silica sol A.
[0035] In the second step, add 0.7mL of silane coupling agent KH-550, add 3mL of absolute ethanol, and finally add 0.7mL of deionized water, stir for 30min to obtain solution B.
[0036] In the third step, sol A was added to solution B, heated to 70°C, and stirred for 30 minutes to obtain solution C. Add 0.186g graphene oxide and 50mL deionized water, continue stirring for 1h to obtain solution D.
[0037] The fourth step is to put solution D into an 80mL autocl...
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Abstract
The invention relates to the field of graphenedielectric constant regulation and control. The impedance matching is adjusted by adding lithium-aluminum-silicon (LAS) nanoparticles to change the complex dielectric constant of graphene (RGO), lithium-aluminum-siliconsol is prepared by adopting a sol-gel method, a silanecoupling agent is added to change the conductivity of the lithium-aluminum-silicon (LAS) sol, and the interface bonding of the lithium-aluminum-silicon (LAS) nanoparticles and the reduced grapheneoxide nanosheets is enhanced. The graphene (RGO) and the lithium-aluminum-silicon(LAS) are compounded in a nano-scale through a sol-gel method and a solvothermal method to prepare the LAS / RGO nano composite material, so that the dielectric constant of the graphene (RGO) is reduced, and the RGO / LAS composite material has excellent wave-absorbing performance. By adopting the graphene dielectric constant regulation and control method, the RGO / LAS composite material with excellent microwave absorption properties such as low density, wide frequency band, strong absorption and the like can be obtained.
Description
technical field [0001] The present invention relates to the field of graphene dielectric constant control, specifically a method of compounding graphene and lithium aluminum silicon at the nanometer scale through sol-gel method and solvothermal method and adding a silanecoupling agent, and then precisely controlling the graphene method of dielectric constant. Background technique [0002] With the rapid development of information technology, especially microwave communication technology, electromagnetic radiationpollution in our environment has become a problem that cannot be ignored. It is harmful to human health and interferes with the operation of electronic equipment. In this regard, electromagnetic absorbing materials have attracted great attention of scientists. [0003] In recent years, graphene has attracted extensive attention as a microwave interference shielding material due to its unique two-dimensional structure, ultra-low density, high specific surface area,...
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