Question

Describe about "aerogel".

$answer \: must \: be \: in \: 60 + \: words \:$
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Answer 1

Answer:

• Aerogels are extremely porous and low in density, but can be made to be very strong with new technology developed at NASA.
• Here, Mary Ann Meador of NASA's Glenn Research Center demonstrates the strength of new aerogels.

• Aerogels are among the lightest solid materials known to man.
• They are created by combining a polymer with a solvent to form a gel, and then removing the liquid from the gel and replacing it with air.
• Aerogels are extremely porous and very low in density.
• They are solid to the touch.
• This translucent material is considered one of the finest insulation materials available.

• Although aerogels were first invented in the 1930s, NASA's Glenn Research Center in Cleveland has invented groundbreaking methods of creating new types of aerogels that could change the way we think about insulation.
• Aerogels are created by removing moisture from a gel while maintaining the gel structure.
• The resulting material provides very effective insulation.

Answer 2

A block of aerogel in a hand

Aerogel is a synthetic porous ultralight material derived from a gel, in which the liquid component for the gel has been replaced with a gas without significant collapse of the gel structure.The result is a solid with extremely low density and extremely low thermal conductivity. Nicknames include frozen smoke, solid smoke, solid air, solid cloud, blue smoke owing to its translucent nature and the way light scatters in the material. Silica aerogels feel like fragile expanded polystyrene to the touch, while some polymer-based aerogels feel like rigid foams. Aerogels can be made from a variety of chemical compounds.

Aerogel was first created by Samuel Stephens Kistler in 1931, as a result of a bet with Charles Learned over who could replace the liquid in "jellies" with gas without causing shrinkage.Aerogels are produced by extracting the liquid component of a gel through supercritical drying or freeze-drying.

This allows the liquid to be slowly dried off without causing the solid matrix in the gel to collapse from capillary action, as would happen with conventional evaporation. The first aerogels were produced from silica gels. Kistler's later work involved aerogels based on alumina, chromia and tin dioxide. Carbon aerogels were first developed in the late 1980s.