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Shower nozzle-structured mesoporous carbon and nanometer cobalt compound and preparation method and application thereof

A technology of mesoporous carbon and nano-cobalt, applied in the field of wave absorbing materials, can solve the problems of high cost, limited application field of electromagnetic shielding, difficult movement, etc., and achieves the effects of light weight, excellent absorption characteristics, and improved absorption effect.

Active Publication Date: 2018-05-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional electromagnetic wave shielding method mainly relies on metal steel plates. However, due to the weight of the steel plate itself, the disadvantages of high cost and difficult movement greatly limit the applicable fields of electromagnetic shielding.

Method used

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  • Shower nozzle-structured mesoporous carbon and nanometer cobalt compound and preparation method and application thereof
  • Shower nozzle-structured mesoporous carbon and nanometer cobalt compound and preparation method and application thereof
  • Shower nozzle-structured mesoporous carbon and nanometer cobalt compound and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] S1) Dissolve 60 g of sucrose in 100 ml of 1 mol / L sulfuric acid solution, then add 150 ml of tetraethyl orthosilicate, and stir for 2 to 3 hours to obtain a clear solution.

[0045] Transfer the clear solution obtained above to a PP plastic bottle, add 3ml to 4.5ml of 4% HF, quickly put it in a drying oven at 60°C to react for 36 hours, then raise the temperature to 100°C and 160°C in sequence, and react respectively 8 hours.

[0046] The resulting material was carbonized in a tube furnace nitrogen atmosphere at a rate of 5° C. per minute to 900° C. for 3 hours.

[0047] Finally, the carbonized material was washed with 40% HF acid solution to remove the silicon skeleton, and dried in a drying oven at 60° C. for 6 hours to obtain mesoporous carbon, which was gray-black lumps. Store the mesoporous carbon in a desiccator.

[0048] The above-mentioned mesoporous carbon is ball-milled to obtain a powder, and its transmission electron microscope picture is shown in figure ...

Embodiment 2

[0055] S1, adopt sol-gel method to prepare mesoporous carbon, its specific method is as follows:

[0056] First, 60 g of sucrose was dissolved in 100 ml of 1 mol / L sulfuric acid solution, and then 150 ml of tetraethyl orthosilicate was added, and stirred for 2 to 3 hours to obtain a clear solution.

[0057] Transfer the clear solution obtained above to a PP plastic bottle, add 3.5ml of 4% HF, quickly put it in a drying oven at 60°C for 36 hours, then raise the temperature to 100°C and 160°C in sequence, and react for 8 hours respectively.

[0058] The resulting material was carbonized in a tube furnace nitrogen atmosphere at a rate of 5° C. per minute to 900° C. for 3 hours.

[0059] Finally, the carbonized material was washed with 40% HF acid solution to remove the silicon skeleton, and dried in a drying oven at 60° C. for 6 hours to obtain mesoporous carbon. Store the mesoporous carbon in a desiccator.

[0060] The prepared mesoporous carbon is a gray-black lump, and powde...

Embodiment 3

[0067] The mesoporous carbon and nano-cobalt composite wave-absorbing material with lotus structure prepared in Example 1 is applied to the absorption of electromagnetic waves in the frequency range of 2GHz to 18GHz. The specific application process is as follows:

[0068] (1) When preparing the composite of mesoporous carbon and nanomagnetic metal cobalt, the mass ratio of mesoporous carbon to cobalt nitrate salt is 1:4. Add 30 g of the prepared mesoporous carbon and nano-magnetic metal cobalt composite powder into 70 g of silicone resin and stir for 1 h until the two are evenly mixed.

[0069] (2) Add 10ml xylene solvent dropwise to the above mixture and stir evenly. (Stirring time 0.5h~2h can be implemented; xylene 5ml~20ml can be implemented)

[0070] (3) Add 10ml of curing agent dropwise to the above mixture, and coat on the coater. (Curing agent 5ml~20ml can be implemented)

[0071] (4) Dry the coating in a cool and ventilated place to obtain a sample coating.

[007...

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Abstract

The invention provides a shower nozzle-structured mesoporous carbon and nanometer cobalt compound, wherein nanometer cobalt is embedded in mesoporous carbon pores. By enabling magnetic nanometer metalcobalt particles to be embedded in mesoporous carbon pores, dielectric loss and magnetic loss on electromagnetic wave are achieved, and wave-absorption strength and loss frequency band can be controlled easily, so that the electromagnetic wave absorption effect is improved effectively; meanwhile, metal cobalt is high in mass and harmful to a human body; and by enabling a few nanometer cobalt particles to be embedded in mesoporous carbon pores, and compared with a cobalt material, the wave absorption effect is ensured, and lighter weight, higher safety and plasticity are achieved, so that thecompound can be widely doped to various electromagnetic wave absorption materials.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a composite of mesoporous carbon and nano-cobalt with a lotus structure and a preparation method and application thereof. Background technique [0002] With the rapid development of modern electronic science and technology and aerospace technology, various electronic and electrical equipment have brought great help to people's daily life and social construction. But on the other hand, in electronic power equipment, the mutual interference of electromagnetic waves seriously affects the normal operation of these equipment; electromagnetic radiation has different degrees of harm to the human central nervous system, reproductive system, blood and cardiovascular system, and immune system, and has Cumulative effect; In modern warfare, stealth technology, as an effective means to improve the survivability of weapon systems, is also highly valued by various countries. H...

Claims

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Application Information

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IPC IPC(8): H05K9/00C01B32/354C01B32/05
CPCC01P2004/80H05K9/0081
Inventor 陈慕宇张海燕曾国勋严成结陈元武
Owner GUANGDONG UNIV OF TECH
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