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Aerogel: A "Future Material" Limited by Current Science

wallpapers Industry 2020-10-23
Aerogel-the world's lightest solid material (Guinness recognizes graphene aerogel as the world's lightest solid), because it contains 97% air and 3% solid structure, only 1.5 of the air density Times.
 
In addition to being very light, aerogels also have excellent thermal insulation properties. This is mainly due to the "Knudsen effect". Since aerogels are mostly composed of silica and air, silica solids have a general thermal conductivity. The thermal conductivity of air is also very low. Besides, aerogels have a lot of nano-sized pores, which make it difficult for air to diffuse through the aerogel to transfer convective heat. Therefore, aerogels often appear in environments that require high-temperature resistance, such as on the Mars rover, which uses aerogels for heat preservation. Besides, the water-resistance of aerogels mainly comes from modification. By changing the polar -OH on the surface to non-polar -OR, a hydrophobic aerogel can be obtained.
 
With the deepening of research on aerogels, particle physicists realized that this nano-scale material could be used to collect Cherenkov radiation particles that are difficult to capture because these particles break into the complex structure of aerogels. It isn't easy to pass through the other end and stay in the aerogel. In addition to collecting particles, the silica aerogel prepared by NASA's Jet Propulsion Laboratory also took a "flight" to space and undertook the task of containing comet particles. The industrial production of aerogel still has a severe challenge; that is, aerogel is very brittle. Although its load-bearing capacity is powerful, it is a pity that its tension is minimal. A little bit of force can break it into Two", so other additives generally need to be added.

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Tag: aerogel