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 ?
In Japan, Aerogel will reach a market size of US$624.5 Million by the close of the analysis period.
According to (https://www.nasa.gov/topics/technology/features/aerogels.html) NASA , aerogel is one of the lightest solid materials known to humans.
[USPRwire, Fri Jul 19 2019] Aerogels are extremely versatile materials that exhibit exceptional properties such as low density, acoustic & thermal damping, high porosity and electrical conductivity, to name a few.
[ClickPress, Fri Jul 19 2019] Aerogels are extremely versatile materials that exhibit exceptional properties such as low density, acoustic & thermal damping, high porosity and electrical conductivity, to name a few.
The researchers suggest that regions of the Martian surface could be made habitable with a material -- silica aerogel -- that mimics Earth's atmospheric greenhouse effect.
The aerogel is translucent, allowing essential sunlight for photosynthesis to pass through, and blocking harmful ultraviolet radiation at the same time.
"We created this cellulose nanocrystal aerogel as a more effective alternative to these synthetic materials."
3D Printed Graphene Aerogel Enhances Supercapacitor Ability
Stephen Steiner says those who have heard of it (1) probably have because of its application on the Space Shuttle and (2) "think of something wet and wobbly like Jell-O." But, he points out, the aerogel in the Space Shuttle tile application was actually made with silica and far from being wobbly, it was brittle.
Summary: The synthesis of silica based hydrophobic aerogel from gold mine waste is an interesting direction on usage of mine waste due to the chemical composition (Si, Al).
Processes assisted by supercritical C[O.sub.2] (SC-C[O.sub.2]) have been proposed as alternatives to the traditional ones in many fields, for example, for micro and nanoparticle production [29, 30], extraction [31, 32], membrane and aerogel preparation [33-36].
You in their The product is being developed by Graphene Composites - which is based on Sedgefield NETPark - using ultrastrong graphene, aerogel and other advanced materials.