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A feconi@c/carbon fiber airgel composite wave-absorbing material and its preparation method

A technology of composite wave-absorbing materials and carbon fiber airgel, which is applied in the fields of fiber chemical characteristics, chemical instruments and methods, and rayon manufacturing, can solve the problems of lack of magnetic loss, achieve enhanced electrical loss, increase electrical conductivity, and increase reliability. Sexual effect

Active Publication Date: 2022-03-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve technical problems such as the lack of magnetic loss of a single carbon fiber material and the low dielectric loss of a carbon-based material derived from a single metal MOF, the present invention provides a FeCoNi@C / carbon fiber airgel composite wave-absorbing material and its preparation method, which can make a variety of The loss mechanism is effectively combined and synergistic to obtain good impedance matching and achieve thin, light, wide and strong microwave absorption performance in the frequency range of 2-18 GHz. It is an ideal choice for new lightweight and high-efficiency microwave absorption materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1, prepare sisal fiber

[0030] After cutting 5 g of sisal leaves into pieces, they were washed with deionized water, soaked in 250 mL of 5 wt % sodium hydroxide solution, and magnetically stirred in a water bath at 70 °C for 4 h at a stirring speed of 500 rpm. After stirring, wash with water until neutral. Under the same water bath conditions and stirring conditions, the obtained product was soaked in 250 mL, 5 wt % sodium hypochlorite solution. After the stirring is completed, filter and wash, and dry in a vacuum oven at 60°C.

[0031] Step 2, preparation of FeCoNi-MOF solution

[0032] At room temperature, slowly add 0.1 g ferrous nitrate hexahydrate, 0.4 g cobalt nitrate hexahydrate, and 0.2 g nickel nitrate hexahydrate to the aqueous solution of dihydroxyterephthalic acid (0.2 g dihydroxyterephthalic acid dissolved in 40 mL deionized water), after stirring evenly, 60 mL of N,N-dimethylformamide solution was added, and stirred at 300 rpm for 30 min.

[0033...

Embodiment 2

[0037] Step 1, prepare sisal fiber

[0038] After cutting 6 g of sisal leaves into pieces, they were washed with deionized water, soaked in 250 mL of 5 wt % sodium hydroxide solution, and magnetically stirred in a water bath at 80 °C for 4 h at a stirring speed of 500 rpm. After stirring, wash with water until neutral. Under the same water bath conditions and stirring conditions, the obtained product was soaked in 250 mL, 5 wt % sodium hypochlorite solution. After the stirring is completed, filter and wash, and dry in a vacuum oven at 60°C.

[0039] Step 2, preparation of FeCoNi-MOF solution

[0040] At room temperature, slowly add 0.2 g ferrous nitrate hexahydrate, 0.4 g cobalt nitrate hexahydrate, and 0.3 g nickel nitrate hexahydrate to the aqueous solution of dihydroxyterephthalic acid (0.2 g dihydroxyterephthalic acid dissolved in 40 mL of deionized water), after stirring evenly, 70 mL of N,N-dimethylformamide solution was added, and stirred at 300 rpm for 40 min.

[004...

Embodiment 3

[0045] Step 1, prepare sisal fiber

[0046] After cutting 6 g of sisal leaves into pieces, they were washed with deionized water, soaked in 250 mL of 5 wt % sodium hydroxide solution, and magnetically stirred in a water bath at 90 °C for 5 h at a stirring speed of 500 rpm. After stirring, wash with water until neutral. Under the same water bath conditions and stirring conditions, the obtained product was soaked in 250 mL, 5 wt % sodium hypochlorite solution. After the stirring is completed, filter and wash, and dry in a vacuum oven at 60°C.

[0047] Step 2, preparation of FeCoNi-MOF solution

[0048] At room temperature, slowly add 0.2 g ferrous nitrate hexahydrate, 0.5 g cobalt nitrate hexahydrate, and 0.4 g nickel nitrate hexahydrate to the aqueous solution of dihydroxyterephthalic acid (0.3 g dihydroxyterephthalic acid dissolved in 40 mL deionized water), after stirring evenly, 70 mL of N,N-dimethylformamide solution was added, and stirred at 400 rpm for 40 min.

[0049...

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Abstract

The invention discloses a FeCoNi@C / carbon fiber airgel composite wave-absorbing material. The composite wave-absorbing material includes a carbon fiber matrix and FeCoNi@carbon composite nano-microspheres, and the FeCoNi@carbon composite nano-microspheres are loaded on the surface of the carbon fiber matrix. In the present invention, carbon fiber is used as a matrix, and microspherical FeCoNi@C derived from FeCoNi-MOF is loaded on its surface. The prepared composite material solves the lack of multiple effective electromagnetic wave loss mechanisms of a single carbon material and a single-metal MOF-derived material. The problems, good impedance matching and better absorption efficiency are obtained, and it is an ideal choice for new lightweight and efficient microwave absorbing materials.

Description

technical field [0001] The invention belongs to the technical field of microwave absorbing materials, and in particular relates to a FeCoNi@C / carbon fiber airgel composite wave absorbing material and a preparation method thereof. Background technique [0002] The application of electromagnetic waves has been involved in various fields, such as industrial production, medical diagnosis, and military weapons. However, while these applications bring us convenience, they also pose a threat to our living environment, because a large number of electromagnetic waves will cause electromagnetic pollution, which seriously threatens human health and information security. In order to solve the above problems, researchers have been working hard to prepare microwave absorbing materials with excellent performance. Traditional absorbing materials are mainly based on strong absorption, while new absorbing materials are required to meet the characteristics of "thin, light, wide, and strong". ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/16D01F1/10C09K3/00
CPCD01F9/16D01F1/10C09K3/00
Inventor 何曼周钰明许正建王瑞丽彭昊陈曦霍饶
Owner SOUTHEAST UNIV
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