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Carbon nanotube and carbonyl iron self-assembled wave-absorbing agent and preparation method thereof

A technology of carbon nanotubes and carbonyl iron, which is applied in the field of materials, can solve the problems of narrow absorption frequency band, poor impedance matching, and weak absorption strength, etc., and achieve the effect of increasing microwave absorption performance, broad application prospects, and excellent electromagnetic wave absorption performance

Pending Publication Date: 2021-10-08
南京冠旭新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when carbon nanotubes are used alone as a wave absorber, there are still disadvantages such as the loss mechanism is mainly limited to the resistive loss related to conductivity, and the impedance matching is poor, the absorption strength is weak, and the absorption frequency band is narrow.

Method used

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  • Carbon nanotube and carbonyl iron self-assembled wave-absorbing agent and preparation method thereof
  • Carbon nanotube and carbonyl iron self-assembled wave-absorbing agent and preparation method thereof
  • Carbon nanotube and carbonyl iron self-assembled wave-absorbing agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] This embodiment provides a carbon nanotube and carbonyl iron self-assembled wave absorbing agent, the preparation method of which comprises the following steps:

[0026] Step 1, preparation of negatively charged carbon nanotubes:

[0027] Prepare 500 mL of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 10 g / L;

[0028] Weigh 5 g of carbon nanotubes and add them to an aqueous solution of sodium dodecylbenzenesulfonate, and use ultrasonic treatment for 2 hours;

[0029] The above mixed solution was subjected to suction filtration, and the obtained paste was dried in an oven at 60° C. for 24 hours to obtain negatively charged carbon nanotubes.

[0030] Step 2, preparation of positively charged sheet carbonyl iron:

[0031] Configure 500 mL of cetyltrimethylammonium bromide aqueous solution with a concentration of 10 g / L;

[0032] Weigh 5g of iron carbonyl flakes into cetyltrimethylammonium bromide aqueous solution, and use ultrasonic treatment f...

Embodiment 2

[0041] This embodiment provides a carbon nanotube and carbonyl iron self-assembled wave absorbing agent, the preparation method of which comprises the following steps:

[0042] Step 1, preparation of negatively charged carbon nanotubes:

[0043] Prepare 500 mL of alkyl sodium sulfate aqueous solution with a concentration of 0.05 g / L;

[0044] Weigh 5g of carbon nanotubes and add them into an aqueous solution of sodium alkyl sulfate, and use ultrasonic treatment for 3 hours;

[0045] The above mixed solution was subjected to suction filtration, and the obtained paste was dried in an oven at 60° C. for 24 hours to obtain negatively charged carbon nanotubes.

[0046] Step 2, preparation of positively charged sheet carbonyl iron:

[0047] Configuration concentration is 500mL of dodecyl dimethyl amine oxide aqueous solution of 0.05g / L;

[0048] Weigh 5g of spherical carbonyl iron and add it to the aqueous solution of dodecyldimethylamine oxide, and use ultrasonic treatment for 3...

Embodiment 3

[0056] This embodiment provides a carbon nanotube and carbonyl iron self-assembled wave absorbing agent, the preparation method of which comprises the following steps:

[0057] Step 1, preparation of negatively charged carbon nanotubes:

[0058] Prepare 500mL aqueous solution of alkyl polyoxyethylene ether sodium sulfate with a concentration of 20g / L;

[0059] Weigh 5 g of carbon nanotubes and add them to an aqueous solution of alkyl polyoxyethylene ether sodium sulfate, and use ultrasonic treatment for 2.5 hours;

[0060] The above mixed solution was subjected to suction filtration, and the obtained paste was dried in an oven at 60° C. for 24 hours to obtain negatively charged carbon nanotubes.

[0061] Step 2, preparation of positively charged sheet carbonyl iron:

[0062] Configuration concentration is 500mL of octadecyltrimethylammonium chloride aqueous solution of 20g / L;

[0063] Weigh 5g of spherical carbonyl iron and add it to an aqueous solution of octadecyltrimethy...

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Abstract

The invention discloses a carbon nanotube and carbonyl iron self-assembled wave-absorbing agent and a preparation method thereof. The preparation method comprises the steps that a carbon nanotube is treated with an anionic surfactant, so that the surface of the carbon nanotube is negatively charged; meanwhile, carbonyl iron is treated with a cationic surface active agent, so that the surface of carbonyl iron is positively charged; and in an aqueous solution, negatively charged carbon nanotubes are combined with positively charged carbonyl iron in an electrostatic self-assembly manner, and then drying is conducted to prepare the composite wave-absorbing agent self-assembled by the carbon nanotubes and the carbonyl iron. The prepared composite wave absorbing agent has excellent electromagnetic wave absorbing performance.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a wave absorbing agent, in particular to a carbon nanotube and carbonyl iron self-assembled wave absorbing agent and a preparation method thereof. Background technique [0002] With the development of social science and technology, electromagnetic waves have been widely used in communications, electrical appliances, military, medical and other fields. While people enjoy the convenience of technological progress, they are also inevitably affected by electromagnetic radiation. Electromagnetic radiation can cause adverse effects on the human body. It will first affect the sensory nerve endings of people, and then affect the central nervous system. Under this influence, the human heart, pancreas, eyes and other organs are very prone to discomfort. In severe cases, it can also cause heart palpitations, blood pressure drop and even vision loss. Therefore, electromagnetic wave absorbing material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16C01B32/174C01B32/168C09K3/00
CPCC01G49/16C01B32/174C01B32/168C09K3/00
Inventor 李皓董斌费大壮徐鑫陈为蔚
Owner 南京冠旭新材料科技有限公司