Rice husk based C/magnetic Co particle composite wave absorber and preparation method thereof

A rice husk-based carbon and wave absorbing agent technology, which is applied in the field of wave-absorbing materials, can solve the problems of complex modification of magnetic components and lack of research on rice husk-based carbon wave absorbing agents, and achieve excellent wave-absorbing performance and strong absorption characteristics. Effect

Inactive Publication Date: 2017-03-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the further modification of magnetic components of rice husk carbon materials is o...

Method used

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  • Rice husk based C/magnetic Co particle composite wave absorber and preparation method thereof
  • Rice husk based C/magnetic Co particle composite wave absorber and preparation method thereof
  • Rice husk based C/magnetic Co particle composite wave absorber and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] The method for synthesizing rice husk-based carbon / magnetic Co particle composite absorber material provided by the present invention can be achieved through the following reaction steps:

[0040] (1) Wash the rice husk (10.0g) with distilled water three times to remove impurities such as dust on the surface of the rice husk. After drying, put the rice husk in a plastic container containing hydrofluoric acid aqueous solution (mass fraction 30%), stir and etch for 10 hours, centrifuge (2000 rpm) to remove the supernatant, and then use the hydrofluoric acid aqueous solution (mass fraction) 20%) was washed 3 times and centrifuged; then the centrifuged product was washed 3 times with distilled water and centrifuged; finally, the centrifuged product was placed in an oven and dried at 80°C for 10 hours to obtain 7.6 g of hydrofluoric acid-treated rice husk.

[0041] (2) Add 3.0g of hydrofluoric acid-treated rice husk to a 250mL single-necked round bottom flask, and add 15mmol of c...

Embodiment 2

[0044] The method for synthesizing rice husk-based carbon / magnetic Co particle composite absorber material provided by the present invention can be achieved through the following reaction steps:

[0045] (1) Add 2.5 g of the rice husk treated with hydrofluoric acid in step (1) of Example 1 to a 250 mL single-neck round bottom flask, and add 15 mmol of cobalt chloride hexahydrate CoCl 2 ·6H 2 O, add 50mL of distilled water, stir and let the cobalt chloride hexahydrate dissolve, stand for 10h, and distill under reduced pressure to remove the distilled water. The rice husk modified with cobalt chloride was placed in an oven and dried at 120°C for 10 hours to obtain 4.0 g of the product.

[0046] (2) Put the rice husk treated with cobalt chloride in a porcelain crucible, transfer to a high-temperature tube furnace, and treat at 1000°C for 2h (programmed temperature: 20~1000°C, 5°C / min, 196min; 1000°C, 120min; 1000~100℃, 5℃ / min, 180min). The carbonized product is further mechanically g...

Embodiment 3

[0048] The method for synthesizing rice husk-based carbon / magnetic Co particle composite absorber material provided by the present invention can be achieved through the following reaction steps:

[0049] (1) Add 3.2 g of the rice husk treated with hydrofluoric acid in step (1) of Example 1 into a 250 mL single-necked round bottom flask, and add 17 mmol of cobalt chloride hexahydrate CoCl 2 ·6H 2 O, add 50mL of distilled water, stir and let the cobalt chloride hexahydrate dissolve, stand for 10h, and distill under reduced pressure to remove the distilled water. The rice husk modified with cobalt chloride was placed in an oven and dried at 120°C for 10 hours to obtain 5.1 g of the product.

[0050] (2) Put the rice husk treated with cobalt chloride in a porcelain crucible, transfer to a high-temperature tube furnace, and treat at 1000°C for 2h (programmed temperature: 20~1000°C, 5°C / min, 196min; 1000°C, 120min; 1000~100℃, 5℃ / min, 180min). The carbonized product is further mechanical...

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Abstract

The invention provides a rice husk based C/magnetic Co particle composite wave absorber and a preparation method thereof and belongs to the technical field of wave absorbing materials. Magnetic Co particles of the rice husk based C/magnetic Co particle composite wave absorber are 1.3 mu m in size, and rice husk based C also has a porous structure. The preparation method of the composite wave absorber comprises three steps: pretreatment: rice husk is washed with purified water and treated with HF (hydrofluoric acid), Si compounds in the rice husk are removed through etching, and the rice husk treated with the HF is obtained after drying; modification: the rice husk treated with the HF is soaked in a CoCl2 aqueous solution, water is removed through reduced-pressure distillation, and CoCl2 modified rice husk is obtained; carbonization: the CoCl2 modified rice husk is placed in a tube furnace and carbonized at a high temperature in an inert gas atmosphere, the carbonized material is further ground, and the rice husk based C/magnetic Co particle composite wave absorber is obtained. The prepared wave absorber has excellent wave absorbing performance and shows stronger absorbing characteristic on electromagnetic waves.

Description

Technical field [0001] The invention belongs to the technical field of absorbing materials, and particularly relates to a rice husk-based carbon / magnetic Co particle composite absorbing agent and a preparation method thereof. Background technique [0002] The rapid development of the electronics industry has made electromagnetic pollution increasingly serious in recent years, and absorbing materials have played a vital role in electromagnetic pollution protection and electromagnetic attenuation. At the same time, in the stealth field of military targets, absorbing materials also play a vital role, which can effectively ensure the safety of military targets such as target aircraft. Absorbing materials, also known as microwave absorbing materials or electromagnetic wave attenuating materials, can effectively reduce the reflection of incident electromagnetic waves on the surface of objects, so that electromagnetic waves can be effectively incident into the interior of the material, ...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 岳喜贵左小丹方基永姜振华
Owner JILIN UNIV
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