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One-step hydrothermal method for preparing ultrathin Fe3O4/CNTs (carbon nanotubes) composite wave-absorbing nanomaterial with high absorbability

A nano-absorbing material and wave-absorbing material technology, which is applied in the field of wave-absorbing, can solve the problems of high density, complexity, and easy-to-corrosion preparation, and achieve the effect of simple process, high reflection loss, and abundant raw materials

Inactive Publication Date: 2019-03-08
BEIHANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Traditional absorbing materials such as ferrite, ceramics, and metal magnets have remarkable absorbing performance, but their disadvantages are high density, easy corrosion and complicated preparation, which make it difficult to meet the performance requirements of new absorbing materials that are "light, thin, strong, and wide"

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  • One-step hydrothermal method for preparing ultrathin Fe3O4/CNTs (carbon nanotubes) composite wave-absorbing nanomaterial with high absorbability
  • One-step hydrothermal method for preparing ultrathin Fe3O4/CNTs (carbon nanotubes) composite wave-absorbing nanomaterial with high absorbability
  • One-step hydrothermal method for preparing ultrathin Fe3O4/CNTs (carbon nanotubes) composite wave-absorbing nanomaterial with high absorbability

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Embodiment 1

[0019] Ultra-thin and highly absorbent Fe 3 o 4 / CNTs composite nano wave-absorbing material preparation method specific steps are as follows:

[0020] In the first step, 0.4g of ferric chloride hexahydrate was dissolved in 60ml of ethylene glycol, stirred by magnetic force to form a uniform solution, then 0.9g of urea and 2.4g of tetrabutylammonium bromide were added and stirred until dissolved, and then added to the solution 0wt%, 3wt%, 5wt%, and 7wt% of CNTs were added to the mixture, and subjected to magnetic stirring and ultrasonic treatment for 20 min.

[0021] In the second step, the obtained mixed solution was transferred to a 100 ml reaction kettle, and the reaction kettle was placed in a vacuum oven at 180° C. for 1 hour. After the sample was completely cooled to room temperature, the precipitate was collected by centrifuge separation, and washed several times with deionized water and absolute ethanol, and then the obtained product was dried in a vacuum oven.

[0...

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Abstract

The invention discloses an ultrathin Fe3O4 / CNTs (carbon nanotubes) composite nanomaterial having high absorbability and applied to a high-performance wave-absorbing material, and belongs to the fieldof wave-absorbing materials. A preparation method comprises the following steps: firstly, jointly treating and mixing ferric chloride hexahydrate, ethylene glycol, urea, tetrabutylammonium bromide andCNTs into a uniform solution; then, placing the obtained mixed solution in a reactor for a hydrothermal reaction; finally, placing a product in a tubular sintering furnace and performing heat treatment in mixed atmosphere of 5% H2 / Ar to obtain the final Fe3O4 / CNTs composite wave-absorbing nanomaterial. The process is simple, raw materials are abundant, and the Fe3O4 / CNTs composite wave-absorbingnanomaterial can be prepared with the one-step hydrothermal method. The Fe3O4 / CNTs composite wave-absorbing nanomaterial is ultrathin and high in absorbability, with addition of the CNTs, the requirement for light weight of the novel wave-absorbing material can be met, and high reflection loss can be realized with 2.75wt% of load in a paraffin base and is -58.6dB as shown in the drawing.

Description

technical field [0001] The invention belongs to the field of microwave absorption, and relates to a one-step hydrothermal method for preparing ultra-thin strong absorbing Fe 3 o 4 The preparation of / CNTs composite nano-absorbing materials is applied in the field of microwave absorption, and high reflection loss can be achieved by low-load loading in paraffin. Background technique [0002] Electromagnetic pollution is another environmental problem after air pollution, water pollution and noise pollution. Electromagnetic radiation can cause direct or indirect damage to the human body in various ways such as thermal effects and non-thermal effects. Therefore, the application in daily life and military fields It is necessary to study absorbing materials that can effectively reduce electromagnetic radiation and reflect / absorb electromagnetic shielding. [0003] Traditional absorbing materials such as ferrite, ceramics and metal magnets have remarkable absorbing performance, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 于荣海姜光明水江澜刘晓芳
Owner BEIHANG UNIV
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