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Prussian blue redox derived iron-based wave-absorbing material and preparation method thereof

A wave absorbing material, Prussian blue technology, applied in electrical components, magnetic field/electric field shielding, etc., can solve the problem of narrow effective absorption frequency band, achieve the effect of simple and feasible, meet design requirements, and low production cost

Active Publication Date: 2021-03-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the problem of narrow effective absorption frequency band under low thickness of MOFs-derived iron-based absorbing materials, the present invention provides an iron-based absorbing material derived from Prussian blue redox and an iron-based absorber derived from Prussian blue redox Preparation method of wave material

Method used

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  • Prussian blue redox derived iron-based wave-absorbing material and preparation method thereof
  • Prussian blue redox derived iron-based wave-absorbing material and preparation method thereof
  • Prussian blue redox derived iron-based wave-absorbing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The specific preparation steps of a Prussian blue redox-derived iron-based wave-absorbing material are as follows:

[0029] (1): Add 15.2 g of polyvinylpyrrolidone and 1.7 mL of hydrochloric acid into 200 mL of deionized water, stir to dissolve, add 0.44 g of ferrous potassium chloride and stir for 30 min, seal the beaker and put it in 80 o C oven insulation reaction for 24 h; the reacted product was filtered, washed and dried to obtain Prussian blue powder. Prussian blue powder is a blue powder with the molecular formula Fe 4 [Fe(CN) 6 ] 3 , the particles are cube-shaped with a particle size of 400-800 nm.

[0030] see figure 1 , the particles of the prepared Prussian blue powder have obvious cubic shape and smooth surface, and the average particle size is about 500 nm.

[0031] (2): Put Prussian blue powder in the air at 2 o C / min heating rate increased to 350 o C and keep it warm for 6 h, cool down naturally to get ferric oxide (Fe 2 o 3 )powder. Ferric oxi...

Embodiment 2

[0040] The specific preparation steps of a Prussian blue redox-derived iron-based wave-absorbing material are as follows:

[0041] (1): Add 15.2 g of polyvinylpyrrolidone and 1.7 mL of hydrochloric acid into 200 mL of deionized water, stir to dissolve, add 0.44 g of ferrous potassium chloride and stir for 30 min, seal the beaker and put it in 80 o C oven insulation reaction for 24 h; the reacted product was filtered, washed and dried to obtain Prussian blue powder. Prussian blue powder is a blue powder with the molecular formula Fe 4 [Fe(CN) 6 ] 3 , the particles are cube-shaped with a particle size of 400-800 nm.

[0042] (2): Put Prussian blue powder in the air at 2 o C / min heating rate increased to 350 o C and keep it warm for 6 h, cool down naturally to get ferric oxide (Fe 2 o 3 )powder. Ferric oxide powder is a deep red powder, and the particles are irregular cubes assembled from small particles, with a particle size of 200-800 nm.

[0043] (3): Add 1 g of ferri...

Embodiment 3

[0049] (1): Add 15.2 g of polyvinylpyrrolidone and 1.7 mL of hydrochloric acid into 200 mL of deionized water, stir to dissolve, add 0.44 g of ferrous potassium chloride and stir for 30 min, seal the beaker and put it in 80 o C oven reaction for 24 h; the reacted product was filtered, washed and dried to obtain Prussian blue powder. Prussian blue powder is a blue powder with the molecular formula Fe 4 [Fe(CN) 6 ] 3 , the particles are cube-shaped with a particle size of 400-800 nm.

[0050] (2): Put Prussian blue powder in the air at 2 o C / min heating rate increased to 350 o C and keep it warm for 6 h, cool down naturally to get ferric oxide (Fe 2 o 3 )powder. Ferric oxide powder is a deep red powder, and the particles are irregular cubes assembled from small particles, with a particle size of 200-800 nm.

[0051] (3): 1 g of ferric oxide (Fe 2 o 3 ) powder into the mixed solution, the mixed solution was prepared by mixing 80 mL water, 32 mL absolute ethanol and 0.4 ...

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Abstract

The invention discloses a prussian blue redox derived iron-based wave-absorbing material and a preparation method thereof, and belongs to the technical field of microwave absorbing materials. The iron-based wave-absorbing material is black gray powder and is composed of iron-based magnetic particles, and the components of the material can comprise Fe, FeO, Fe3O4, C and Fe3C. The effective absorption bandwidth of the wave-absorbing material can reach 5.44 GHz under the conditions that the filling degree is 40 wt% and the thickness is 1.5 mm, and the wave-absorbing material shows excellent wave-absorbing performance with low thickness and wide frequency band. The preparation method disclosed by the invention is simple and feasible, and comprises the steps of air oxidation, resin coating andcarbon thermal reduction. Air oxidation of the Prussian blue effectively ensures that the derivative product has higher magnetic phase content, and the effective control of Fe2O3 reduction degree, derivative phase composition and microstructure can be realized by accurately regulating and controlling the content of the phenolic resin. The moderate particle size and high magnetic phase content ensure high magnetic loss, and the existence of conductive iron, graphite and a multiphase interface ensures high dielectric loss and proper impedance matching.

Description

technical field [0001] The invention belongs to the technical field of microwave absorbing materials, and in particular relates to a Prussian blue redox-derived iron-based microwave absorbing material, and also relates to a preparation method of the above-mentioned Prussian blue redox-derived iron-based wave-absorbing material. Background technique [0002] In recent years, the rapid development of microwave detection and communication technology in military and civilian fields has also brought troubles to the safety of stealth military targets and the normal operation of electronic equipment. Electromagnetic wave absorbing materials can absorb electromagnetic waves by means of dielectric or magnetic loss mechanisms, thereby effectively eliminating the adverse effects of electromagnetic waves, and thus become a hot research field at present. A large number of studies have found that metal-organic frameworks (MOFs) derived iron-based magnetic absorbing materials have both hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 刘伟段鹏韬张学斌苏海林
Owner HEFEI UNIV OF TECH
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