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Wave-absorbing metamaterial and preparation method thereof

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

Active Publication Date: 2014-05-14
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. Take ethyl orthosilicate as the silicon source, take 104 grams of ethyl orthosilicate, 31.5 grams of water, 46-460 grams of ethanol, and 31-310 grams of ethylene glycol, and mix them evenly. The molar ratio is equivalent to ethyl orthosilicate. The ratio of ester: water: ethanol is 1:3.5:4-20 to obtain silica sol; ammonia water with a concentration of 0.35mol / L is added dropwise, the pH value is adjusted to 2.5-3.5, and it is left to stand to obtain silica gel, Aging; then supercritical drying method was used, the composite wet gel was placed in a high temperature and high pressure reactor, evacuated with Ar, the Ar pressure was adjusted at 12MPa, the temperature was controlled at 150°C, the supercritical reaction was performed for 10h, and the Ar protective atmosphere was reduced to Take 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 powd...

Embodiment 2

[0049] a. Use water glass as silicon source, formamide and ethylene glycol as drying control additives, acetic acid as catalyst, mix well, adjust pH value to 10-14, stand still to obtain silica gel, and age; then use room temperature Dry method to dry. Obtained 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 first add the aerogel powder into the ethanol solution, and stir for 10-30min. 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. Place the above powder in a PTFE mold, vibrate at 50-400 rpm, scrape the surface, and cover the surface ...

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, and 31-310 grams of ethylene glycol, and mix them evenly. The molar ratio is equivalent to ethyl orthosilicate. The ratio of ester: water: ethanol: ethylene glycol is 1:3.5:4-20:1-10 to obtain a silica sol; 15.6 g of nano-carbonyl iron powder is gradually added to the sol, and the mixture is stirred uniformly.

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

[0057] c. Use acetone as a displacer to remove water in the gel; then use acetone medium, add the gel obtained in step c, and then add 1% to 5% of the gel volume sodium dodecyl benzene sulfonate dispersant Dispersion (the dispersant is to avoid the agglomeration of aerogel nano-powders), and mix by ball milling.

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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 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 properties, that is, the conductive materials in it cannot form a connected phase; in addition, it is also required to be able to process metal microstructures, copper cladding, etc. (existing processes. ). 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, thus limiting the development of metamaterial absorbing materials. [0003] "Thin, light, wide and strong" are the overall development requirements of wave absorbing materials. In this patent, nano-porous silica aerogel mat...

Claims

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Application Information

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Patent Type & Authority Applications(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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