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.
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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In the present study, the influence of silica aerogel and HGM fillers at different contents on the thermal conductivity and adhesion of epoxy composites are studied and compared.
Aspen Aerogels Incorporated, an aerogel technology company, has launched its latest innovation in aerogel insulation technology, Pyrogel(R) HPS.
This study attempted to create a new type of nanocomposite based on NCF aerogels. Bamboo parenchymal cells sourced from industrially processed bamboo residues were used as a novel source of NCF aerogels.
The effective dissolution of cellulosic macromolecules is the predominant step to prepare cellulose-based aerogels (aerocelluloses) and develop value-added materials with well-defined architectures.
The electrical conductivity of carbon aerogel varies as per its density and thus, the material can be used as an electrode.
Summary: The electrical conductivity of carbon aerogel varies as per its density and thus, the material can be used as an electrode.
Summary: TEHRAN (FNA)- New research suggest that regions of the Martian surface could be made habitable with a material -- silica aerogel -- that mimics Earth's atmospheric greenhouse effect.
Chemistry company BASF SE (BASF) and Aspen Aerogels Inc (Aspen), a provider of aerogel technology, on Wednesday announced the signing of an addendum to an exclusive supply agreement, expanding the companies strategic partnership.
Aerogels are low-density solids typically made from gels which are dried in such a way as to preserve the gel structure.
In this study gold mine waste was used as a silicon source to synthesize of silica based aerogels. Silica aerogel is known as solid fume with very high pore volume which is also a nano-porous form of silica [7].
Aerogels are generally produced by freeze drying of the corresponding hydrogels.