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Date: Fri, 10 Feb 2006 23:23:11 -0500
From: Greg Perry <gr..._at_liveammo.com>
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Subject: Re: [TSCM-L] Re: Aerogel now publicly available in sample quantities
References: <43ED4BA6.9040005_at_liveammo.com> <7.0.1.0.2.20060210223954.03d37930_at_phreaker.net>
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I don't think it's that far off topic, especially when you consider an
aerogel's IR filtering and acoustic insulation properties..
Some unique high frequency properties as well.
kondrak wrote:
> This has been one of my areas of great interest.
> The manufacturing process involves evaporating an alcohol from the gel.
> From:
> http://homepages.cae.wisc.edu/~aerogel/aboutaerogel.html#aerogel
>
> <http://homepages.cae.wisc.edu/%7Eaerogel/aboutaerogel.html#aerogel>--fwd
> Aerogel is made by drying the alcogel and extracting the liquid from
> the solid silica component. If you have ever left Jell-O out of the
> refrigerator, you probably will have noticed that it shrunk and got
> fairly disgusting in the matter of a few days. The same thing happens
> to alcogel when it is dried by evaporating the solvent off. The
> evaporating liquid solvent causes the alcogel's solid silica component
> to collapse by capillary action. This means that after the solvent
> has been completely taken out of the gel, the gel has collapsed and
> formed a dense solid that is a pitiful 10% of the original volume of
> the gel. This solid is called xerogel (xero=hard, gel=gel) and is how
> they make things like contact lenses and high-purity lenses.
> --end
>
> Im waiting for someone to start selling stock in a company producing
> fireproof clothing out of it. Its also been mentioned as a repair for
> damage to the Shuttle in space, and ceramic/aerogel tiles have been
> produced.
>
> Sorry if this is horribly OT, but this is a scientific breakthrough
> I'm extremely interested in, and after all most of us are scientists
> at heart on this list.
>
>
> At 21:27 2/10/2006, you wrote:
>
>> http://www.unitednuclear.com/aerogel.htm
>>
>> Aerogel is made from Silicon Dioxide, the same material as ordinary
>> Glass, only 1,000 times less dense.
>>
>> Aerogel (also called 'frozen smoke' because of its hazy blue
>> appearance), is a truly remarkable material.
>>
>> It is the lightest and lowest-density solid known to exist, and holds
>> an unbelievable 15 entries in the Guinness Book of World Records,
>> including best insulator and lowest density solid.
>>
>> Aerogel is composed of 99.8% air and is chemically similar to
>> ordinary glass.
>>
>> Being the world's lightest known solid, it weighs only three times
>> that of air.
>>
>> When handled, Aerogel feels like a very light, hard foam. Being
>> chemically similar to glass, it also happens to shatter like glass,
>> yet is incredibly strong structurally, and can support thousands of
>> times its own weight. Theoretically, a block weighing less than a
>> pound could support a weight of half a ton.
>>
>> Due to its microstructure, Aerogel is a powerful desiccant, rapidly
>> absorbing any moisture in your fingertips when held. This usually
>> leaves some dry spots on the skin that disappear in a short time.
>>
>> Aerogel's true strength is its incredible insulating properties. It
>> negates just about any kind of energy transfer - thermal, electrical
>> or acoustic.
>>
>> A one-inch thick Aerogel window has the same insulation value as 15
>> panes of glass and trapped air - which means a conventional window
>> would have to be ten-inches thick to equal a one-inch thick Aerogel
>> window.
>>
>> Aerogel's density is just 3 milligrams per cubic centimeter. Its
>> melting point is 2,200 degrees F (1,200 degrees C).
>>
>> A large panel of Aerogel was most recently used by NASA in the
>> Stardust mission, which successfully collected collect comet &
>> interstellar dust samples & returned them to Earth. Previously, it
>> was used in the Mars Pathfinder Rover to insulate its components from
>> the large temperature swings on Mars.
>
Received on Sat Mar 02 2024 - 00:57:20 CST