Aerogel and metallic compositions
a technology of metallic compositions and aerogels, applied in the field of aerogel compositions, can solve the problems of insufficient control over the manner in which metallic particles are formed, compositions with inconsistent metal particle sizes, and broad particle size distributions, and achieve the effect of enhancing performance or equivalency
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example 1
Preperation of RF Aerogels
[0064] The RF aerogels were synthesized by the reaction of resorcinol with formaldehyde. For each run, 2 grams (“g”) of resorcinol was dissolved in 2.38 g of water in a test tube. Subsequently, 0.019 g of sodium carbonate and 2.95 g of formaldehyde solution were added.
[0065] The tube was then sealed by a rubber stopper and the contents mixed by shaking. The tube was kept at room temperature for one(1) day, at 50° C. for one (1) day and at 90° C. for three (3) days. At the end of the first day, the solution in the tube gelled and had a yellow-orange color. The gel progressively became darker during the curing period and was dark red-black in the end. At the end of the 90° C. period, the monolith was taken out of the test tube and immersed in approximately 200 milliliters (“ml”) acetone. There it was kept for a period of two (2) days. Subsequently, acetone was extracted supercritically.
[0066] Supercritical carbon dioxide extraction was conducted using a hi...
example 2
[0074] To investigate the effect of immersion time in acetone, 3 monoliths were prepared using the procedure and reactant compositions given above in Example 1. One sample was left for one (1) day, one sample was left for two (2) days and one sample was left for five days in an acetone bath followed by a one hour sonication in fresh acetone. Subsequently, acetone was extracted from the samples using supercritial carbon dioxide as described above in Example 1.
[0075] After depressurization, the weights of the pellets ranged from 2.84 to 2.90 g indicating that immersion time in acetone had no effect on the amount of water displaced. It is belived that sonication of the samples in acetone accelerated the acetone-water exchange process dramatically.
example 3
Preparation of Carbon Aerogels
[0076] RF aerogels made in accordance with Example 1 were converted to carbon aerogels by pyrolysis in an inert nitrogen atmosphere. RF aerogel in monolithic form was placed in a quartz tube. The quartz tube was paced in a tubular oven. One end of the tube was connected to a nitrogen cylinder.
[0077] The flow rate of the nitrogen was controlled using a needle valve placed after the regulator. The other end of the tube was connected to a soap bubble meter to measure the flow rate of nitrogen. The flow rate of nitrogen was adjusted to 100 cm3 / min and the oven was heated to 1000° C. under flowing nitrogen. The heating rate was approximately 5° C. / min. The temperature inside the oven reached 1020° C. in approximately six (6) hours.
[0078] The oven was kept at this temperature for another five (5) hours. Subsequently, the oven was turned off and cooled overnight with nitrogen flowing. The material removed from the tube was black and its size appeared to hav...
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