Lucio Virzì
25-02-2006, 21:57
Che ne sapete?
http://cgi.ebay.com/NASA-type-Aerogel-Large-Monolithic-Size_W0QQitemZ7743189628QQcategoryZ416QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Mi fa venire voglia di possederelo, un oggetto del genere :)
http://i14.ebayimg.com/04/i/06/2d/f5/be_1.JPG
C'è addirittura uno store :D http://stores.ebay.com/The-Aerogel-Store
Description:
ONE OF THE LARGEST PIECES ON EBAY!!!! Collectors piece of NASA type Silica Aerogel. This is the same kind of material that was used in the NASA Stardust Mission to collect dust and carbon-based samples during it's encounter with Comet Wild 2. This is 1 large monolithic piece of Silica aerogel. This is NOT a 'small sample' or little broken pieces.
* Own a piece of space history!!!!
* Makes a great conversation piece
* Use it for a science project
* Display it
* Create your own experiment
* Great for kids show and tell
Measurements:
You are bidding on 1 piece, approximately 2 x 2 x 1/2 inches.
Aerogel does not cut or machine well so your sample will be irregular shaped. See picture for example.
Details:
Aerogel is a solid-state substance similar to gel where the liquid component is replaced with gas. The result is an extremely low density solid with several remarkable properties, most notably its effectiveness as an insulator. It is nicknamed frozen smoke, solid smoke or blue smoke due to its semi-transparent nature; however it feels like foam to the touch.
Aerogel was first created by Steven Kistler in 1931, as a result of a bet with Charles Learned over who could replace the liquid inside a jelly jar with gas without causing shrinkage. The first results were silica gels. Aerogel can be made of many different materials; Kistler's work involved aerogels based on silica, alumina, chromia, tin and carbon.
Aerogel is composed of 99.8% air with a typical density of 3 mg/cm3. It feels like hard foam. Pressing softly won't leave any mark; pressing harder will leave a permanent dimple. Pressing hard enough will cause a catastrophic breakdown in the sparse structure causing it to shatter like glass (known as friability). Despite the fact that it is prone to shattering, it is very strong structurally, able to hold over 2000 times its own weight. Its impressive load bearing abilities are due to the dendritic microstructure, with spherical particles of average size 2-5 nm fused together to clusters, forming three-dimensional highly porous structure of fractal-like chains with pores smaller than 100 nanometers. The average size and density of pores can be controlled during manufacture.
Aerogel is a remarkable insulator because it doesn't allow any of the three methods of heat transfer (convection, conduction or radiation). It is a good insulator of convection because it the air is not allowed to move throughout the lattice. Silica aerogel is a good conductive insulator because silica is not a conductive material (although metallic aerogel is conductive of heat). Carbon aerogel is a good radiative insulator because carbon absorbs the infrared radiation that transfers heat. The most insulative aerogel is silica aerogel with carbon added to it. SEAgel is a material similar to organic aerogel, made of agar.
Due to its hygroscopic nature, aerogel feels dry and acts as a strong desiccant. Since it is mostly air, it appears semi-transparent. The color it does have is due to Rayleigh scattering of the shorter wavelengths of visible light by the nanosized dendritic structure. This causes it to appear bluish against dark backgrounds and whiteish against bright backgrounds.
Aerogels by themselves are hydrophilic, but chemical treatment of their surface can make them hydrophobic.
LuVi
http://cgi.ebay.com/NASA-type-Aerogel-Large-Monolithic-Size_W0QQitemZ7743189628QQcategoryZ416QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Mi fa venire voglia di possederelo, un oggetto del genere :)
http://i14.ebayimg.com/04/i/06/2d/f5/be_1.JPG
C'è addirittura uno store :D http://stores.ebay.com/The-Aerogel-Store
Description:
ONE OF THE LARGEST PIECES ON EBAY!!!! Collectors piece of NASA type Silica Aerogel. This is the same kind of material that was used in the NASA Stardust Mission to collect dust and carbon-based samples during it's encounter with Comet Wild 2. This is 1 large monolithic piece of Silica aerogel. This is NOT a 'small sample' or little broken pieces.
* Own a piece of space history!!!!
* Makes a great conversation piece
* Use it for a science project
* Display it
* Create your own experiment
* Great for kids show and tell
Measurements:
You are bidding on 1 piece, approximately 2 x 2 x 1/2 inches.
Aerogel does not cut or machine well so your sample will be irregular shaped. See picture for example.
Details:
Aerogel is a solid-state substance similar to gel where the liquid component is replaced with gas. The result is an extremely low density solid with several remarkable properties, most notably its effectiveness as an insulator. It is nicknamed frozen smoke, solid smoke or blue smoke due to its semi-transparent nature; however it feels like foam to the touch.
Aerogel was first created by Steven Kistler in 1931, as a result of a bet with Charles Learned over who could replace the liquid inside a jelly jar with gas without causing shrinkage. The first results were silica gels. Aerogel can be made of many different materials; Kistler's work involved aerogels based on silica, alumina, chromia, tin and carbon.
Aerogel is composed of 99.8% air with a typical density of 3 mg/cm3. It feels like hard foam. Pressing softly won't leave any mark; pressing harder will leave a permanent dimple. Pressing hard enough will cause a catastrophic breakdown in the sparse structure causing it to shatter like glass (known as friability). Despite the fact that it is prone to shattering, it is very strong structurally, able to hold over 2000 times its own weight. Its impressive load bearing abilities are due to the dendritic microstructure, with spherical particles of average size 2-5 nm fused together to clusters, forming three-dimensional highly porous structure of fractal-like chains with pores smaller than 100 nanometers. The average size and density of pores can be controlled during manufacture.
Aerogel is a remarkable insulator because it doesn't allow any of the three methods of heat transfer (convection, conduction or radiation). It is a good insulator of convection because it the air is not allowed to move throughout the lattice. Silica aerogel is a good conductive insulator because silica is not a conductive material (although metallic aerogel is conductive of heat). Carbon aerogel is a good radiative insulator because carbon absorbs the infrared radiation that transfers heat. The most insulative aerogel is silica aerogel with carbon added to it. SEAgel is a material similar to organic aerogel, made of agar.
Due to its hygroscopic nature, aerogel feels dry and acts as a strong desiccant. Since it is mostly air, it appears semi-transparent. The color it does have is due to Rayleigh scattering of the shorter wavelengths of visible light by the nanosized dendritic structure. This causes it to appear bluish against dark backgrounds and whiteish against bright backgrounds.
Aerogels by themselves are hydrophilic, but chemical treatment of their surface can make them hydrophobic.
LuVi