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 ?
Strong demand in the subsea, North American and European markets offset particular weakness in the Latin American market," said Don Young, President and CEO of Aspen Aerogels.
In terms of application industry, the global aerogel market is segmented into key applications:
This research studies the effects of the amount of water on the formation rate of the gel, mechanical properties of the synthesized gel, and the final structure of the aerogel.
From Figure 3 it can be seen that the peak of pore size distribution (PSD) of the Na containing aerogel is at a pore diameter of 10-15 nm, whereas the peak for all the other doped aerogels is at 5-10 nm.
Westphal and his team took pictures of both the aerogel and the net's aluminum frame with a powerful microscope.
Aerogel composites, process for producing the same and their use.
1 producer of rubber and specialty grade carbon black, activated carbons, inkjet colorants and cesium formate drilling fluids and has market-leading positions in fumed silica, aerogel, and elastomer composites.
specializes in masterbatches and carbon black, produces an aerogel called Nanogel.
In the preparation of carbon aerogel the next, last step is the pyrolysis of the organic aerogel.
Since aerogel is more efficient than traditional pipe insulation, Suncor will also see significant energy savings on this section of pipe.
New studies demonstrate that in addition to their ability to absorb oil and modify rheology, Dow Corning silica silylate aerogel materials generate a soft-focus effect.
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.