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Boron-doped mesoporous flower-like ferroferric oxide/carbon composite wave-absorbing material and preparation method thereof

A technology of iron tetroxide and wave absorbing material, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of dielectric loss, difficult to achieve electromagnetic parameter matching, etc.

Active Publication Date: 2020-05-15
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a single carbon material only has dielectric loss properties, and it is difficult to achieve the ideal matching of electromagnetic parameters, so that it cannot be used as an ideal microwave absorbing material alone.

Method used

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  • Boron-doped mesoporous flower-like ferroferric oxide/carbon composite wave-absorbing material and preparation method thereof
  • Boron-doped mesoporous flower-like ferroferric oxide/carbon composite wave-absorbing material and preparation method thereof
  • Boron-doped mesoporous flower-like ferroferric oxide/carbon composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Disperse 1 mmol of anhydrous ferric chloride, 1 mmol of CTAB, 2 mmol of boric acid, and 9 mmol of urea in 40 mL of ethylene glycol, and stir magnetically for 4 hours;

[0034] (2) Transfer the above solution to a high-pressure reactor, put it in an oven at 160°C, take it out after 16 hours, and cool it down to room temperature naturally. Suction filtration, washing with water and absolute ethanol three times each, and oven drying at 60°C for 12 hours to obtain the precursor iron alkoxide, XRD shows figure 1 Shown; XRD results show that the phase of the precursor is iron alkoxide.

[0035] (3) Grinding the iron alkoxide obtained in step (2) evenly, and calcining at 500° C. for 2 hours in an argon atmosphere. Obtain the composite absorbing material, marked as: B-F / C-1, XRD such as figure 1 Shown; XRD results show that after calcining by argon, the phase of the iron alkoxide of the precursor disappears, and the product of ferric oxide is obtained. SEM such as fi...

Embodiment 2

[0039] (1) Disperse 2mmol of anhydrous ferric chloride, 1mmol of CTAB, 2mmol of boric acid, and 9mmol of urea in 40mL of ethylene glycol, and stir magnetically for 0.5h;

[0040] (2) Transfer the above solution to a high-pressure reactor, put it in an oven at 160°C, take it out after 16 hours, and cool it down to room temperature naturally. The precursor was washed three times with water and absolute ethanol, and dried in an oven at 60°C for 12 hours to obtain the precursor iron alkoxide;

[0041] (3) Grinding the iron alkoxide obtained in step (2) evenly, and calcining at 500° C. for 2 hours in an argon atmosphere. Obtain the composite absorbing material, marked as: B-F / C-2, XRD such as figure 1 As shown, the XRD results show that the composite material obtained by argon calcination is ferric oxide. SEM such as image 3 As shown, the SEM results show that the morphology of the composite material presents an obvious flower-like morphology with a diameter of 2-3 μm. Compar...

Embodiment 3

[0045] (1) Disperse 3mmol of anhydrous ferric chloride, 1mmol of CTAB, 2mmol of boric acid, and 9mmol of urea in 40mL of ethylene glycol, and stir magnetically for 0.5h;

[0046] (2) Transfer the above solution to a high-pressure reactor, put it in an oven at 160°C, take it out after 16 hours, and cool it down to room temperature naturally. The precursor was washed three times with water and absolute ethanol, and dried in an oven at 60°C for 12 hours to obtain the precursor iron alkoxide;

[0047] (3) Grinding the iron alkoxide obtained in step (2) evenly, and calcining at 500° C. for 2 hours in an argon atmosphere. Obtain the composite absorbing material, marked as: B-F / C-3, XRD such as figure 1 As shown, the XRD results show that the composite material obtained by calcination is ferric oxide. SEM such as Figure 4 As shown, the composite material presents a flower-like structure with a diameter of more than 3 μm, and compared with Examples 1 and 2, the flower-like struct...

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Abstract

The invention discloses a boron-doped mesoporous flower-like ferroferric oxide / carbon composite wave-absorbing material and a preparation method thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The preparation method comprises the following steps: taking ferric chloride, urea, hexadecyl trimethyl ammonium bromide and boric acid as reaction raw materials andethylene glycol as a solvent, preparing an iron alkoxide precursor by adopting a solvothermal method, and then calcining the iron alkoxide precursor in inert gas to obtain the boron-doped mesoporous flower-like ferroferric oxide / carbon composite wave-absorbing material. The wave-absorbing material and paraffin are compounded for a wave-absorbing performance test, the result of the test shows thata sample has a very strong absorbing performance on electromagnetic waves, and the maximal reflection loss value reaches -51dB; by adjusting the thickness, the effective absorption band can reach 14.2GHz, including the whole C wave band, X wave band and Ku wave band. The wave-absorbing material has an excellent wave-absorbing performance, a wide wave-absorbing frequency band and high absorbing strength, and has a great application potential in the field of wave absorption.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, in particular to a boron-doped mesoporous flower-like ferric oxide / carbon composite absorbing material and a preparation method thereof. Background technique [0002] In recent years, with the vigorous development of electronic technology, the microwave pollution produced by it has become the fourth largest pollution after air pollution, water pollution and noise pollution. Therefore, it is very important to design efficient electromagnetic wave absorbing materials. Absorbing materials are also microwave absorbing materials, electromagnetic wave absorbing materials or radar stealth materials, which can effectively reduce the reflection of electromagnetic waves on the surface of objects, and at the same time effectively absorb or attenuate electromagnetic waves entering the material, and then radiate them with heat energy. At the same time, absorbing materials are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 岳惠娟唐吉敏梁娜田戈冯守华
Owner JILIN UNIV
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