MXene composite fiber reinforced graphene aerogel wave-absorbing material and preparation method thereof

A technology of graphene airgel and graphene hydrogel, which is applied in the field of wave-absorbing materials, can solve problems such as high conductivity, impedance mismatch, and unfavorable impedance matching, and achieve wide effective absorption bandwidth, strong absorbing loss, The effect of improving the electromagnetic wave loss ability

Active Publication Date: 2021-07-30
SOUTHEAST UNIV
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Problems solved by technology

But at the same time, its high conductivity is not conducive to impedance matching, and two-dimensional MXene with high specific surface area will reflect electromagnetic waves at high content, resulting in impedance mismatch.
Combining MXene with graphene airgel and designing a unique three-dimensional structure is a reasonable solution. At present, there are few achievements in this area, and further research is needed.

Method used

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  • MXene composite fiber reinforced graphene aerogel wave-absorbing material and preparation method thereof
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  • MXene composite fiber reinforced graphene aerogel wave-absorbing material and preparation method thereof

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[0029] The embodiment of the present invention provides a preparation method of MXene composite fiber reinforced graphene airgel wave-absorbing material, comprising the following steps:

[0030] Step 10) preparing MXene composite fiber;

[0031] Step 20) configure graphene oxide water dispersion solution;

[0032] Step 30) adding the MXene composite fiber to the graphene oxide aqueous dispersion, then adding a reducing agent for high-speed dispersion to obtain the MXene composite fiber-graphene oxide aqueous dispersion;

[0033] Step 40) putting the MXene composite fiber-graphene oxide water dispersion solution into the reactor, and obtaining the MXene composite fiber reinforced graphene hydrogel by hydrothermal self-assembly reaction;

[0034] Step 50) Put the MXene composite fiber reinforced graphene hydrogel into liquid nitrogen to pre-freeze, and then perform freeze-drying treatment to obtain the MXene composite fiber reinforced graphene airgel wave-absorbing material.

...

Embodiment 1

[0051] The following steps were used to prepare MXene composite fiber-reinforced graphene airgel absorbing material:

[0052] (1) Configure MXene water dispersion solution, the MXene used is Ti 3 C 2 T x , the concentration is 5mg / mL; configure the graphene oxide aqueous dispersion solution, the concentration is 2mg / mL; configure the cellulose aqueous dispersion solution, the cellulose used is carboxymethylated cellulose, the diameter of the cellulose is about 3μm, and the concentration is 1mg / mL .

[0053] (2) Mix the MXene water-dispersed solution and the cellulose water-dispersed solution with a solute mass ratio of 1:10, and keep stirring, the stirring speed is 500rpm, and the stirring time is 0.5h; then use deionized water to wash 5 times, And carry out centrifugation and filtration to obtain MXene composite fibers, such as figure 2 shown.

[0054] (3) Add the MXene composite fiber to the graphene oxide water dispersion solution, and then add the reducing agent acco...

Embodiment 2

[0061] The following steps were used to prepare MXene composite fiber-reinforced graphene airgel absorbing material:

[0062] (1) Configure MXene water dispersion solution, the MXene used is Ti 3 C 2 T x, the concentration is 10mg / mL; configure the graphene oxide aqueous dispersion solution, the concentration is 5mg / mL; configure the cellulose aqueous dispersion solution, the cellulose used is carboxymethylated cellulose, the diameter of the cellulose is 5μm, and the concentration is 2mg / mL .

[0063] (2) Mix the MXene water-dispersed solution and the cellulose water-dispersed solution with a solute mass ratio of 1:5, and keep stirring, the stirring speed is 800rpm, and the stirring time is 1h; then use deionized water to wash 5 times, and Perform centrifugation and filtration to obtain MXene composite fibers.

[0064] (3) Add the MXene composite fiber to the graphene oxide aqueous dispersion solution, and then add the reducing agent according to the mass ratio of the amou...

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Abstract

The invention provides a preparation method of an MXene composite fiber reinforced graphene aerogel wave-absorbing material. The preparation method comprises the following steps of: preparing MXene composite fibers; preparing a graphene oxide aqueous dispersion solution; adding the MXene composite fiber into the graphene oxide aqueous dispersion solution, then adding a reducing agent, and carrying out high-speed dispersion to obtain an MXene composite fiber-graphene oxide aqueous dispersion solution; putting the MXene composite fiber-graphene oxide aqueous dispersion solution into a reaction kettle, and obtaining MXene composite fiber reinforced graphene hydrogel through a hydrothermal self-assembly reaction; putting the MXene composite fiber reinforced graphene hydrogel into liquid nitrogen to pre-freeze the hydrogel, then carrying out freeze drying treatment so as to obtain the MXene composite fiber reinforced graphene aerogel wave-absorbing material. The wave-absorbing material provided by the invention gives consideration to impedance matching while improving the electromagnetic wave loss capability, and has stronger wave-absorbing loss and wider effective absorption bandwidth.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and in particular relates to an MXene composite fiber-reinforced graphene airgel wave-absorbing material and a preparation method thereof. Background technique [0002] With the development of wireless communication technology, related electronic equipment and facilities have been widely used in civilian and military fields. While these technologies and equipment bring convenience to people, they also make the problem of electromagnetic pollution increasingly prominent, and there is an urgent need for efficient electromagnetic wave absorption and shielding materials to protect people from harm. In recent years, airgel absorbing materials have attracted more and more attention and research because of their low density, light weight, and wide absorbing frequency band. [0003] Graphene airgel has a three-dimensional porous structure composed of cross-linked graphene sheets, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/28
CPCC04B26/285C04B2111/00258C04B14/028C04B14/024C04B14/4687
Inventor 刘磊王剑桥吴泽焦松龙
Owner SOUTHEAST UNIV
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