Absorbing metamaterial and preparation method thereof

A technology of metamaterials and polystyrene, applied in the field of metamaterials, can solve the problems of anti-oxidation, poor acid and alkali resistance, low resistivity, high density of magnetic metal powder, etc.

Active Publication Date: 2016-06-29
KUANG CHI INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high density of magnetic metal powder, poor oxidation resistance, acid and alkali resistance, low filling rate, low resistivity, high dielectric constant, etc.
In some existing technologies, although the concept of metal-based materials as airgel is also mentioned, the metal-based materials are the former of the airgel network. If it is reduced, the network will collapse and the voids will disappear.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] a. Using ethyl orthosilicate as the silicon source, take 104 grams of ethyl orthosilicate, 31.5 grams of water, 46-460 grams of ethanol, 31-310 grams of ethylene glycol, and mix evenly. The molar ratio is equivalent to that of ethyl orthosilicate. Ester: water: ethanol is 1:3.5:4-20 to obtain silica sol; add ammonia water with a concentration of 0.35 mol / L dropwise, adjust the pH to 2.5-3.5, and let stand to obtain silica gel. Aging; then using the method of supercritical drying, put the composite wet gel in a high temperature and high pressure reactor, evacuate with Ar, adjust the Ar pressure at 12MPa, control the temperature at 150℃, supercritical reaction 10h, Ar protective atmosphere drops to Take it out at room temperature; get a density of 0.13g / cm 3 , The specific surface area is 810m 2 / g of silica aerogel powder.

[0044] b. Mix the nano-carbonyl iron powder, aerogel powder, and acetone solution in a volume ratio of 1:1.12:100. The order of addition is to first ad...

Embodiment 2

[0049] a. Use water glass as the silicon source, formamide and ethylene glycol as drying control additives, acetic acid as the catalyst, mix well, adjust the pH to 10-14, stand still to obtain silica gel, and then use normal temperature Drying method is dry. Get a density of 0.24g / cm 3 , The specific surface area is 386m 2 / g of silica aerogel powder.

[0050] b. Mix the nano-carbonyl iron powder, the aerogel powder obtained in step a, and the ethanol solution in a volume ratio of 1:9:100. The order of addition is to add the aerogel powder to the ethanol solution first, and stir for 10-30 minutes. Then add nano-carbonyl iron powder while stirring, and use the adsorption characteristics of aerogel to continuously adsorb nano-iron. After stirring evenly, under Ar protective atmosphere, room temperature, 60 o Dry at C to obtain silica aerogel / iron composite powder.

[0051] c. Put the above powder in a polytetrafluoroethylene mold, vibrate under 50-400, and scrape the surface smoothl...

Embodiment 3

[0055] a. Using ethyl orthosilicate as the silicon source, take 104 grams of ethyl orthosilicate, 31.5 grams of water, 92-460 grams of ethanol, 31-310 grams of ethylene glycol, and mix evenly. The molar ratio is equivalent to that of ethyl orthosilicate. Ester: water: ethanol: ethylene glycol is 1:3.5:4-20:1-10 to obtain silica sol; gradually add 15.6 grams of nano-carbonyl iron powder to the sol, and stir evenly.

[0056] b. To the mixed solution obtained in step a, add dropwise ammonia water with a concentration of 0.35 mol / L, adjust the pH value to 2.5-3.5, and let it stand to age the silica-iron composite sol to form a gel.

[0057] c. Use acetone as the displacing agent to remove the water in the gel; then add the acetone medium to the gel obtained in step c, and then add the gel volume 1% to 5% volume of sodium dodecylbenzene sulfonate dispersant Dispersion (the dispersant is to avoid agglomeration of aerogel nano powder), ball milling and mixing.

[0058] d. Using the method ...

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Abstract

The invention discloses a wave-absorbing metamaterial and a preparation method thereof. The wave-absorbing metamaterial comprises the following components in percentage by volume: 30%-90% of syndiotactic polystyrene (SPS), 7%-69% of aerogels and 1%-33% of magnetic metal powder. The wave-absorbing metamaterial not only has good in wave-absorbing performance but also is relatively wide in temperature-resistant range as the aerogels in the wave-absorbing metamaterial are all inorganic materials; the SPS is crystalline and can enable the overall temperature-resistant range of a system to be expanded to be 270 DEG C, and the temperature-resistant range is greatly expanded in comparison with that of other thermoplastic resin.

Description

Technical field [0001] The present invention belongs to the field of wave absorbing materials, and particularly relates to metamaterials with excellent wave absorbing properties. Background technique [0002] Metamaterials generally include insulating electrolytes and conductive microstructures. Therefore, metamaterials require the substrate to have high resistance characteristics, that is, the conductive materials therein cannot form a connected phase; in addition, it also requires the processing of metal microstructures, copper coating, etc. (existing technology ). However, traditional absorbing materials cannot meet the needs of metamaterials. At present, designers of metamaterial absorbing materials use printed circuit boards such as FR4 and F4B to design, which limits the development of metamaterial absorbing materials. [0003] "Thin, light, wide, strong" are the overall development needs of absorbing materials. This patent uses nanoporous silica aerogel materials as the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/06C08K3/08C08K3/36C08K5/56
CPCY02P20/54
Inventor 不公告发明人
Owner KUANG CHI INST OF ADVANCED TECH
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