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Multi-dimensional cobaltosic oxide array/biomass-based porous carbon plate composite wave-absorbing material and preparation method thereof

A composite wave-absorbing material, cobalt tetroxide technology, applied in the preparation/purification of carbon, chemical instruments and methods, oxides of ferrous iron, etc., to achieve the effects of low cost, rich interface effects, and excellent electromagnetic absorption performance

Pending Publication Date: 2022-07-15
浙江优可丽新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are still great challenges for the development of magnetic biomass-based carbon composites

Method used

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  • Multi-dimensional cobaltosic oxide array/biomass-based porous carbon plate composite wave-absorbing material and preparation method thereof
  • Multi-dimensional cobaltosic oxide array/biomass-based porous carbon plate composite wave-absorbing material and preparation method thereof
  • Multi-dimensional cobaltosic oxide array/biomass-based porous carbon plate composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this example, the prepared product is a sea urchin spherical cobalt tetroxide array / biomass-based porous carbon sheet composite wave absorbing material.

[0023] The preparation method of the above sea urchin spherical cobalt tetroxide array / biomass-based porous carbon sheet composite material is as follows:

[0024] Step 1: After ultrasonic cleaning 3 times with deionized water and absolute ethanol respectively, place the thousand sheets of paper in an oven to dry at 60 °C for 12 hours; place the dried thousand sheets of paper in an argon atmosphere at a rate of 5 °C / min. The temperature was raised to 700 °C, calcined for 120 min, and cooled to room temperature with the furnace to obtain biomass-based porous carbon sheet materials.

[0025] Step 2, add 291.5 mg of cobalt nitrate hexahydrate, 300.3 mg of urea, and 74.1 mg of ammonium fluoride into 40 ml of deionized water, and after magnetic stirring until completely dissolved, add 200 mg of the porous carbon sheet o...

Embodiment 2

[0031] In this example, the prepared product is a sheet-like cobalt tetroxide array / biomass-based porous carbon sheet composite wave absorbing material.

[0032] The preparation method of the above-mentioned sheet-like cobalt tetroxide array / biomass-based porous carbon sheet composite material is as follows:

[0033] Step 1: After ultrasonic cleaning 3 times with deionized water and absolute ethanol respectively, place the thousand sheets of paper in an oven to dry at 60 °C for 12 hours; place the dried thousand sheets of paper in an argon atmosphere at a rate of 5 °C / min. The temperature was raised to 700 °C, calcined for 120 min, and cooled to room temperature with the furnace to obtain biomass-based porous carbon sheet materials.

[0034] Step 2, add 291.5 mg of cobalt nitrate hexahydrate, 300.3 mg of urea, and 109.8 mg of ammonium fluoride into 40 ml of deionized water, and after magnetic stirring until completely dissolved, add 200 mg of the porous carbon sheet obtained i...

Embodiment 3

[0036] In this example, the prepared product is a needle-shaped cobalt tetroxide array / biomass-based porous carbon sheet composite wave absorbing material.

[0037] The preparation method of the above-mentioned sheet-like cobalt tetroxide array / biomass-based porous carbon sheet composite material is as follows:

[0038] Step 1: After ultrasonic cleaning 3 times with deionized water and absolute ethanol respectively, place the thousand sheets of paper in an oven to dry at 60 °C for 12 hours; place the dried thousand sheets of paper in an argon atmosphere at a rate of 5 °C / min. The temperature was raised to 700 °C, calcined for 120 min, and cooled to room temperature with the furnace to obtain biomass-based porous carbon sheet materials.

[0039]Step 2, add 291.5 mg of cobalt nitrate hexahydrate, 300.3 mg of urea, and 148.2 mg of ammonium fluoride into 40 ml of deionized water, and after magnetic stirring until completely dissolved, add 200 mg of the porous carbon sheet obtained...

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Abstract

The invention discloses a multi-dimensional cobaltosic oxide array / biomass-based porous carbon plate composite wave-absorbing material and a preparation method thereof.Indian paper serves as a precursor, a porous carbon plate base body is obtained through a high-temperature pyrolysis method, and then the multi-dimensional cobaltosic oxide array / biomass-based porous carbon plate composite wave-absorbing material is obtained through a hydrothermal and heat treatment combined method. A cobaltosic oxide magnetic component with adjustable morphology is loaded on a porous carbon plate, a series of multi-dimensional cobaltosic oxide array / biomass-based porous carbon plate composite wave-absorbing materials are finally obtained, and the special microstructure endows the composite material with an ideal magnetoelectric co-loss mechanism and a rich interface polarization effect. Meanwhile, the impedance matching characteristic and attenuation capacity of a system are further optimized, the needle-shaped cobaltosic oxide array / biomass-based porous carbon plate composite material has the characteristics of high reflection loss and wide absorption frequency band under the condition of small thickness and is an excellent wave-absorbing material, and in addition, the preparation method is simple and safe in process, low in cost, green, environmentally friendly and suitable for industrial production. Therefore, the method has good application value.

Description

technical field [0001] The invention relates to electromagnetic absorption materials in the field of functional materials, in particular to a multi-dimensional cobalt tetroxide array / biomass-based porous carbon sheet composite wave absorbing material and a preparation method thereof. Background technique [0002] In recent years, the rapid development of wireless electronic communication technology and equipment has brought convenience to human beings, and the accompanying electromagnetic wave interference and pollution problems have also seriously affected the operation of surrounding precision equipment and human health. Therefore, an absorbing material with both light weight, broadband, strong absorption and thin thickness is urgently needed to solve these problems. Such materials that can effectively attenuate electromagnetic waves can be divided into dielectric loss absorbing materials and magnetic loss absorbing materials according to their loss mechanisms. However, t...

Claims

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Application Information

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IPC IPC(8): C09K3/00H05K9/00C01G49/08C01B32/05
CPCC09K3/00H05K9/0081C01B32/05C01G49/08C01P2002/72C01P2002/01C01P2004/03C01P2004/04
Inventor 陆伟陈永锋嵇冬季
Owner 浙江优可丽新材料有限公司
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