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A material with tunable wave-absorbing properties and its preparation method

A wave-absorbing performance and tuning technology, applied in the field of preparation of the material, can solve the problems of single nature, complicated preparation process, uncontrollable wave-absorbing performance, etc., and achieve the effects of stable sample performance, simple preparation method and simple operation.

Active Publication Date: 2021-04-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of this paper is to overcome the shortcomings of two-dimensional carbon-based materials represented by graphene, which are complicated preparation process, single property, and uncontrollable absorbing performance, and propose a simple solvothermal-sintering method to prepare two-dimensional carbon-based supported lanthanum Based on the method of rare earth oxide nanocomposite materials, a tunable absorbing material with excellent performance was obtained

Method used

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  • A material with tunable wave-absorbing properties and its preparation method
  • A material with tunable wave-absorbing properties and its preparation method
  • A material with tunable wave-absorbing properties and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of two-dimensional carbon-based supported cerium oxide nanocomposites

[0037] Dissolve 0.4 g (3.2 mmol) of melamine in 100 mL of water at 80°C. 1.0g F127 (poloxamer, purchased from Macklin, P822479-50g, polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer surfactant, H(OCH 2 CH 2 ) x (OCH 2 CHCH 3 ) y (OCH 2 CH 2 ) z OH, average molecular weight Mn~13,000) was added into 40mL of water, placed in a 40°C water bath, and stirred for 1h. Then add 0.3g (0.7mmol) Ce(NO 3 ) 3 ·6H 2 O, stirred for 2h. The above two solutions were mixed and stirred in a water bath at 60°C until evaporated to dryness. The evaporated solid was placed in a tube furnace and sintered under the protection of nitrogen. The sintering procedure was as follows: after heating up from 20 °C to 350 °C at a heating rate of 1 °C / min, the temperature was kept for 3 h; After the heating rate was raised from 350°C to 850°C, the temperature was kept for 2 hours...

Embodiment 2

[0039] Preparation of two-dimensional carbon-based supported cerium oxide nanocomposites with different loadings

[0040] Add 6 parts of 1.0g F127 to 6 containers filled with 40mL water respectively, place in a water bath at 40°C, and stir for 1h. Then 0.05g, 0.10g, 0.20g, 0.50g, 0.70g and 0.90g of Ce(NO 3 ) 3 ·6H 2 O, stirred for 2h. Dissolve 6 parts of 0.4g melamine in 6 containers filled with 100mL of 80°C water respectively. Mix the obtained 6 parts of cerium nitrate solution with 6 parts of melamine solution respectively, and stir in a water bath at 60° C. until evaporated to dryness. The evaporated solid was placed in a tube furnace and sintered under the protection of nitrogen. The sintering procedure was as follows: after heating up from 20 °C to 350 °C at a heating rate of 1 °C / min, the temperature was kept for 3 h; After the heating rate was raised from 350°C to 850°C, the temperature was kept for 2 hours. After natural cooling to room temperature, the obtained...

Embodiment 3

[0042] Preparation of two-dimensional carbon-based supported lanthanide rare earth oxide nanocomposites with different loading types

[0043] Add 13 parts of 1.0g F127 to 13 containers filled with 40mL of water respectively, place in a water bath at 40°C, and stir for 1h. Then, hydrated rare earth nitrates (in turn, hexahydrated lanthanum nitrate La(NO 3 ) 3 ·6H 2 O), cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O), praseodymium nitrate hexahydrate (Pr(NO 3 ) 3 ·6H 2 O), neodymium nitrate hexahydrate (Nd(NO 3 ) 3 ·6H 2 O), samarium nitrate hexahydrate (Sm(NO 3 ) 3 ·6H 2 O), europium nitrate hexahydrate (Eu(NO 3 ) 3 ·6H 2 O), gadolinium nitrate hexahydrate (Gd(NO 3 ) 3 ·6H 2 O), terbium nitrate hexahydrate (Tb(NO 3 ) 3 ·6H 2 O), dysprosium nitrate hexahydrate (Dy(NO 3 ) 3 ·6H 2 O), erbium nitrate hexahydrate (Er(NO 3 ) 3 ·6H 2 O), thulium nitrate hexahydrate (Tm(NO 3 ) 3 ·6H 2 O), ytterbium nitrate pentahydrate (Yb(NO 3 ) 3 ·5H 2 O) and lantha...

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Abstract

The invention relates to a material with adjustable wave-absorbing properties, which is a composite material (CN-REOs) of two-dimensional carbon-based supported lanthanide rare earth oxides (CN-REOs) nanomaterials and polyvinylidene fluoride (PVDF) / PVDF), which includes a small amount of nitrogen-doped carbon nitride with a partially graphitic phase (g‑C 3 N 4 ) structure of two-dimensional carbon-based and nanoscale lanthanide rare earth oxides. The invention also relates to a preparation method of the absorbing material. The wave-absorbing material of the invention has excellent wave-absorbing performance and tuneability.

Description

Technical field: [0001] The invention relates to a material with adjustable wave-absorbing performance, which is a composite material (CN-REOs) of two-dimensional carbon-based supported lanthanide rare earth oxides (CN-REOs) nanomaterials and polyvinylidene fluoride (PVDF) / PVDF), which belongs to the technical field of nanomaterials. The invention also relates to a method for the preparation of said material. [0002] technical background: [0003] In recent years, with the rapid development of electronic technology, the wide application of wireless communication equipment, computers, household appliances, etc. has brought convenience to the people, but also brought electromagnetic radiation hazards. With the increasing demand for green life, the hazards of electromagnetic radiation have gradually attracted people's attention, and after water pollution, air pollution, and noise pollution, electromagnetic wave radiation pollution has been recognized as the fourth largest pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H05K9/00B82Y30/00
CPCB82Y30/00C09K3/00H05K9/0081
Inventor 王广胜高珊
Owner BEIHANG UNIV
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