Chatting on the phone with my pappa the other day, he mentioned that he was working with a wickedly awesome material called aerogel. It is nearly the lightest solid on the planet, as it weights only double what air does, but cooler still is that it has perhaps the lowest coefficient of thermal conductivity of any substance. It is a super insulator.
Add to that the fact that it looks totally freaky, due to Rayleigh scattering of the shorter wavelengths of visible light by the nanosized dendritic structure. People call it
frozen smoke.
I want some. I'm not sure why, but I do. And it's on
ebay. This stuff is freaky.
wikipedia.org:
Aerogels are good thermal insulators because they almost nullify the three methods of heat transfer (convection, conduction and radiation). They are good convective inhibitors because air cannot circulate throughout the lattice. Silica aerogel is an especially good conductive insulator because silica is a poor conductor of heat—a metallic aerogel, on the other hand, would be a less effective insulator. Carbon aerogel is a good radiative insulator because carbon absorbs the infrared radiation that transfers heat at standard temperatures. The most insulative aerogel is silica aerogel with carbon added to it.
Due to its hygroscopic nature, aerogel feels dry and acts as a strong desiccant. Persons handling aerogel for extended periods of time should wear gloves to prevent the appearance of dry brittle spots on their hands.
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