Silica Aerogel Research and Application
Aerogel can be described as a Nano-sized porous solid made by using the sol gel method. A certain drying process is used to replace liquid phases in the gel with gas. Such as gelatin, gum Arabic,
, hair, nails, etc. Also, aerogels have properties similar to gels. They have de-sizing, swelling and thixotropy.
Aerogel is a type of solid material. It's the least dense solid form in existence. Aerogel has a density 3kg per cubic meter. Common aerogels include silicon aerogel. You can find many kinds of aerogels including carbon, sulfur and metal oxide. Aerogel, a compound term, is where aero is an adjectival, meaning flying. Gel is clearly a gel. Literally it refers to a flying gel. An aerogel is any gel that has been prepared from any substance. However, it must be able to dry and be separated from the solvent. It should also be able keep its form unchanged.
Prepare silica aerogel
Aerogel was named originally by S. Kistler. Because of his success in preparing it
He called aerogel supercritical dry method. With the advent and advancement of atmospheric drying technology in the late 1990s, aerogel was defined as any material that is made from wet gel. The aerogel structure is cylindrical and multi-branched Nano porous 3-position network structure. This has extremely high permeability, very high porosity. High specific surface area. And a high volume of pore. Its bulk density can be adjusted between 0.003 and 0.0005 g / cm-3. The density of air is 0.0229 g/cm-3.
A supercritical drying step is required to prepare aerogel. By controlling the reaction conditions of hydrolysis or polycondensation, nanoclusters form in the solution. These clusters stick to each other and create a gel. To prevent damage to the material structure due to the surface tension of micropores, supercritical drying is used. The gel is put in a pressure vessel to heat and pressurize the liquid to create a gel phase change. This allows for the formation of a disordered and porous low-density fluid with a Nanoscale continuous network structure. Material gel.
Use it as a thermal insulation.
Nano-network structure in silicon aerogel limits local thermal excitation. Its solid-state thermal conductivity, which is 2-3 orders higher than those of comparable glassy materials, has a slender Nano shape. Nano-pores prevent the addition of gas molecules to heat conductivity. Silicon aerogel's refractive indice is near 1 and its annihilation factor to visible and infrared light ratio is greater than 100. The silicone aerogel can transmit sunlight efficiently and block infrared radiation from the ambient temperature. This makes it ideal as a transparent thermal insulation material. It is used for solar energy conversion and energy savings. The radiant heat conduction rate of silicon aerogel can also be reduced by doingping. Carbon-doped aerogel's thermal conductivity can fall to as low as 0.01 w/ m K when it is subjected to room temperature pressure. It is also the material that has the lowest thermal conductivity. As a refrigerator insulation material, it is likely to be replaced by polyurethane. The incorporation of titanium dioxide could make silicon aerogel a high-temperature thermal insulation materials. 800K has a temperature conductivity of only 0.03w/mK. It will also be used to develop new materials for military applications.
It has a low sound velocity.
This material is ideal for high-temperature sound insulation or acoustic delays. This material is an ideal material to use as an acoustic resistance co-coupling material with ultrasonic detectors. It has a wide acoustic impedance range of 103-107kg / m2s. Zp, which is the common definition of acoustic resistivity, can be taken as an example. The acoustic resistivity Zp is 1. It improves the transmission of sound waves, and can reduce signal-to-noise ratios in device applications. The sound intensity can be increased by up to 30dB using silica Aerogel, which has a density of around 300kg/m3. Higher sound intensity gains can be achieved by using silica aerogels with density gradients.
For environmental protection, and in the chemical industry. As a novel type of gas filter, nano-structured airgels can be employed. This material is different than other materials because it has high porosity and uniform pore sizes. The material can be used as a gas filter. It is more dense than the average table, and can easily accumulate. Aerogels are also a great choice for new catalysts and catalyst carriers.
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