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. The resulting aerogels are typically about 95–99% air. Aerogels have been produced from silica and other metal oxides, organic polymers, carbon, and other materials. 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 used as insulation in a range of applications; other aerogels are being used in filtration and adsorption applications and as catalysts or carriers for catalysts.

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 ?
These facts indicate that modified silica aerogel with DCPEPT can be used as an inexpensive, efficient, and environmentally safe adsorbent for removal of Hg(II) from aqueous solutions.
Similarly to silica aerogel, HGM have a low density, a low dielectric constant, and excellent sound and thermal insulation properties.
The product is a high-temperature aerogel blanket engineered to provide thermal conductivity and economic performance at service temperatures of up to 650-degreeC (1200-degreeF).
In this study, PF resin readily impregnated into NCF aerogel sheets that were first swelled in deionized water and then soaked in resin solutions (of 5%, 10%, and 30% concentration).
Svenska Aerogel Holding AB (FN:AERO) announced on Thursday the receipt of an advance notice of a granted patent regarding a method for gas filtration.
We chose to partner with Aspen because of their superior aerogel technology platform, which we can enhance as partners in various ways," said Raimar Jahn, president of BASF's Performance Materials division.
In fact, the scientists say the aerogel has uses both in space and on Earth because of its excellent thermal resistance, the reports said.
Silica aerogel is one of the hot topics nowadays, because of its exceptional physical properties, for example, high porosity and specific surface area, low density, and thermal conductivity [1-6].
Deviating from the silica aerogel norm, NASA Glenn Research Center scientists conceived, designed and tested a new kind of aerogel as a basis for antenna substrates--polyimide aerogels.
said it has announced a 50 micron thickness of AeroZero(TM), a lightweight, 100 percent-polymer aerogel that is easily incorporated into electronics and composites.
One benefit of the new wood-based aerogel material is that it can be used for three-dimensional structures.