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.
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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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