aerogel

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aerogel,

any of a group of extremely light and porous solid materials; the lightest is less than four times as dense as dry air. Aerogels are produced from certain gels (see colloidcolloid
[Gr.,=gluelike], a mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance. The mixture is also called a colloidal system, colloidal solution, or colloidal dispersion.
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) by heating the gel under pressure, which causes the liquid in the gel to become supercritical (in a state between a liquid and a gas) and lose its surface tension. In this state, the liquid may be removed from the gel by applying additional heat, without disrupting the porous network formed by the gel's solid component. Silica-, melamine-, and carbon-based aerogels have been produced. Silica-based aerogels are among the lightest, and some, nicknamed "solid smoke" or "frozen smoke," are nearly transparent. Heavier aerogels were first developed in 1931 and have been used to detect high-energy particles emitted by particle acceleratorsparticle accelerator,
apparatus used in nuclear physics to produce beams of energetic charged particles and to direct them against various targets. Such machines, popularly called atom smashers, are needed to observe objects as small as the atomic nucleus in studies of its
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. Newer, lighter aerogels with relatively high insulating properties are being tested as substitutes for the chlorofluorocarbonchlorofluorocarbons
(CFCs), organic compounds that contain carbon, chlorine, and fluorine atoms. CFCs are highly effective refrigerants that were developed in response to the pressing need to eliminate toxic and flammable substances, such as sulfur dioxide and ammonia, in
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 foams used as refrigerator insulation and as replacements for the air between the panes of double-glazed windows; other aerogels are being used as filters.

aerogel

[′e·rō‚jel]
(chemistry)
A porous solid formed from a gel by replacing the liquid with a gas with little change in volume so that the solid is highly porous.
References in periodicals archive ?
Influence of catalysts and SCE regime on density, surface area and total pore volume of H-FA aerogels.
Some of the investors in the most recent round of financing, including Arcapita Ventures, have previously invested in Aspen Aerogels.
The composition and morphology of the organic and carbon aerogels obtained were determined using an EDAX JEOL 6042 analyser, a Leo Supra 35 Scanning Electron Microscope (SEM), and a Spectrum BX FT-IR System (Perkin Elmer), where IR measurements were obtained in the wavelength range from 4000 to 400 [cm.
Aspen Aerogels[TM], the Massachusetts-based developer of the nanotechnology-enabled aerogel blankets, will invest heavily in the oil sands market, beginning with a new laboratory in Edmonton, AB.
A one-inch-thick aerogel slab can shield a delicate flower from a 1,400[degrees]C (2,600[degrees]F) flame and ward off cold better than 15 thermal windowpanes stacked back to back.
A replay of the webcast will be available at the Investors section of the Aspen Aerogels website at http://www.
com)-- According to a new market research report by Allied Market Research titled, "Global Aerogel Market (Raw Material Type, Forms, Applications, Geography) - Industry Analysis, Trends, Share, Opportunities and Forecast, 2013-2020", the global aerogel market is forecast to reach $1,896.
In 2011, when Aspen Aerogels first sought to go public, just 125 companies completed IPOs.
Aerogels are among the most versatile materials available for technical applications due to their many exceptional properties.
It was demonstrated that an industrial mixture of phenols--Honeyol[R] can be successfully used for obtaining aerogels [5].
Aspen Aerogels supplies nanoporous aerogel insulation that is two to four times more effective than traditional insulation materials.
Dow Corning silica silylate aerogels act as optical light diffusers, preventing light from becoming trapped, and allowing for transparency.