Aerogel is a kind of nano porous solid material formed by replacing the liquid phase in the gel with gas by a certain drying method. The gel has excellent heat insulation, and its thermal conductivity can be as low as 0.012W/(m · K). An inch thick aerogel is equivalent to the heat insulation function of 20-30 pieces of ordinary glass; Its porosity is as high as 99.9%, making it a good adsorption medium and can also be developed as a catalyst carrier; At the same time, aerogel also has good flame retardancy, insulation and sound insulation, and is green and environmentally friendly. Its excellent performance makes it applicable in the fields of thermodynamics, acoustics, optics, electricity, and mechanics, and it is also expected to be a "magical material that changes the world".

1、 Excellent thermal insulation
Aerogel is a kind of material with many excellent properties, among which the most remarkable is its thermal insulation performance. The thermal conductivity of silicon aerogel is very low, even lower than 0.016 W/(m · K). In addition, the radiation heat conduction of silicon aerogels can be further reduced by doping. The thermal conductivity of carbon doped aerogel can be as low as 0.012W/(m • K) at room temperature and pressure, which is one of the lowest thermal conductivity solid materials at present.

2、 Good adsorption properties
The porosity of aerogel can reach 99.9%, so its specific surface area is particularly large, and it has good adsorption performance. Silica aerogel can be used as catalyst carrier to improve the activity and stability of the catalyst.

Flame retardant performance grade A
The fire rating can meet the requirements of GB8624-2012 Grade A for the combustion performance of building materials and products. The silica aerogel is generally waterproof and hydrophilic, but when the aerogel encounters chemical active substances, it will form hydrophobic non-polar groups with the oxygen and hydrogen groups on the surface. When 30% of the oxygen and hydrogen groups in the gel form hydrophobic groups, the gel can be completely hydrophobic.

Good insulation performance
The silicon aerogel also has good insulation performance, and its dielectric constant is less than 1.003. It is a good insulation medium, which can reduce the leakage current of integrated circuits, reduce the capacitive effect between wires, and reduce the heating of integrated circuits.
Good sound insulation
The aerogel also has good sound insulation performance, its acoustic impedance can be up to 106 kg/m2 · s, and the porous structure can enhance the sound absorption effect.

Green and environmentally friendly
Aerogel is also a kind of green environmental protection material. It does not contain inhalable fibers and has no irritating effect on the skin. It can be treated with soil burial method and has good environmental protection performance.
Lao Xie said
In general, aerogel is a kind of material with a variety of excellent properties, which can be widely used in construction, electronics, chemical industry and other fields.

At present, most of the top ten battery manufacturers in China have used aerogel insulation materials. Against the background of automobile manufacturers' pursuit of higher energy density, the permeability of aerogel is expected to accelerate. It is estimated that in 2025, the space of aerogel in this field will reach 3.35 billion yuan, and the composite growth rate from 2021 to 2025 will reach 89%.