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Three-dimensional layered MXene electromagnetic shielding foam and preparation method thereof

An electromagnetic shielding and foam technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of low absorption and shielding efficiency, complicated preparation process, poor mechanical properties, etc., and achieve good compression cycle characteristics, high mechanical strength, and low cost Effect

Inactive Publication Date: 2018-11-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to avoid the deficiencies of the prior art, the present invention proposes a three-dimensional layered MXene electromagnetic shielding foam and its preparation method. In an alternating electromagnetic field, the material mainly absorbs and shields the effect, which can be adjusted by compressing the layered foam The absorption / reflection ratio of incident electromagnetic waves, and the material has many advantages such as low density, compressibility, and simple preparation method, which solves the shortcomings of current electromagnetic shielding foam materials such as low absorption and shielding efficiency, poor mechanical properties, and complicated preparation process

Method used

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  • Three-dimensional layered MXene electromagnetic shielding foam and preparation method thereof
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  • Three-dimensional layered MXene electromagnetic shielding foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Mix and stir 5M LiF and 6M HCl, then slowly add 2g of Ti to the solution 3 AlC 2 Powder, stirred for 24h. After the reaction, the suspension was centrifuged with deionized water at 3500rpm for 5 times, each time for 3min, and then the rotation speed was adjusted to 10000rpm for 10min, and the upper black solution obtained by centrifugation was the few-layer Ti 3 C 2 T x Dispersion of MXene.

[0032] (2) Ti with a concentration of 15mg / mL 3 C 2 T x The dispersion was placed in a polytetrafluoroethylene mold with a wedge-shaped polydimethylsiloxane base (slope 20°), and directional freezing was performed with liquid nitrogen until Ti 3 C 2 T x The solution freezes completely, as figure 1 shown.

[0033] (3) The frozen Ti 3 C 2 T x The dispersion and the mold were dried in a freeze dryer for 48 hours at a temperature of 30°C. After drying, the mold was demolded to obtain a layered Ti 3 C 2 T x foam, shaped like figure 2 shown.

[0034] The prepared...

Embodiment 2

[0036] (1) Mix and stir 8M LiF and 8M HCl, then slowly add 1g of Ti to the solution 2AlC powder, stirred for 36h. After the reaction, the suspension was centrifuged with deionized water at 3500rpm for 5 times, each time was 3min, and then the rotating speed was adjusted to 8000rpm, and the time was 30min. The upper black solution obtained by centrifugation was the few-layer Ti 2 CT x of the dispersion.

[0037] (2) Ti with a concentration of 9mg / mL 2 CT x The dispersion was placed in a polytetrafluoroethylene mold with a wedge-shaped PDMS base (slope 15°), and directional freezing was performed with liquid nitrogen until Ti 2 CT x The solution freezes completely.

[0038] (3) Place the frozen MXene dispersion and the mold in a freeze dryer for 36 hours to dry at 0°C, and demould after drying to obtain a layered Ti 2 CT x Foam.

[0039] The prepared layered Ti 2 CT x The electromagnetic shielding effectiveness of the foam can reach 70dB, of which the absorption shiel...

Embodiment 3

[0041] (1) Mix and stir 12M LiF and 8M HCl, then slowly add 2g of Ti to the solution 3 AlCN powder, stirred for 48h. After the reaction, the suspension was centrifuged with deionized water at 3500rpm for 7 times, each time was 3min, and then the rotation speed was adjusted to 9000rpm, and the time was 20min. The upper black solution obtained by centrifugation was the few-layer Ti 3 CNT x of the dispersion.

[0042] (2) Ti with a concentration of 6mg / mL 3 CNT x The dispersion was placed in a polytetrafluoroethylene mold with a wedge-shaped PDMS base (slope 10°), and directional freezing was performed with liquid nitrogen until Ti 3 CNT x The solution freezes completely.

[0043] (3) The frozen Ti 3 CNT x The dispersion and the mold were placed in a freeze dryer for drying treatment 72, the drying temperature was -73°C, and the mold was demoulded after drying to obtain a layered Ti 3 CNT x Foam.

[0044] The prepared layered Ti 3 CNT x The electromagnetic shielding ...

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Abstract

The invention relates to three-dimensional layered MXene electromagnetic shielding foam and a preparation method thereof and aims at solving the problems that an existing porous electromagnetic shielding material is low in absorbing and shielding effectiveness, poor in mechanical property and complicated in preparation process. According to the technical scheme, few-layer MXene dispersion liquid is prepared through wet chemical etching of an MAX phase; the dispersion liquid is directionally frozen through a bidirectional freezing process; and MXene aerogel is prepared through vacuum drying. The prepared MXene aerogel is of a layered structure, is long in range and ordered and has a good compression cycle characteristic, and the strength retention can reach over 60%. The total electromagnetic shielding effectiveness can reach 60-100dB; and the absorbing and shielding effectiveness can be adjusted through compressing the foam, so that the absorption-dominated electromagnetic shielding characteristic is achieved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding materials, and relates to a three-dimensional layered MXene electromagnetic shielding foam and a preparation method thereof. Background technique [0002] With the rapid development of modern electronic technology, electronic devices and wireless communication equipment are widely used, resulting in more and more electromagnetic radiation and interference, making the space electromagnetic environment increasingly complex, and electromagnetic shielding materials have received more and more attention. Traditional electromagnetic shielding materials are mainly high-conductivity metals, such as copper, nickel, silver, etc. Although these materials have high enough shielding effectiveness, they are mainly realized by reflecting electromagnetic waves, and do not attenuate electromagnetic waves in a real sense. New electromagnetic shielding materials require materials to have stronger a...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 殷小玮韩美康李新亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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