Aerogel, a gel filled with gas. Gel refers to a polymer solution or sol with a certain concentration. Under appropriate conditions, the viscosity gradually increases, and finally loses fluidity, becoming an elastic semi-solid with uniform appearance and maintaining a certain shape. The jelly in people's daily life is one of the most widely used liquid gels.
Characteristics of aerogel:
The structural feature of aerogel is a cylindrical multi-branched nanoporous three-position network structure with high permeability, extremely high porosity, extremely low density, high specific surface area, and ultra-high pore volume ratio.
The porous nature of aerogels derives excellent thermal insulation and adsorption properties. Aerogel can be made into thermal insulation felt, which has the characteristics of softness, easy cutting, low density, inorganic fire resistance, overall hydrophobicity, and environmental protection. It is expected to replace glass fiber products, asbestos thermal insulation felt, silicate fiber products and other unenvironmental and thermal insulation properties Poor traditional flexible insulation material. Existing oil-absorbing products generally can only absorb liquids about 10 times their own mass, while the absorption capacity of "carbon sponges" made of aerogel is about 250 times, up to 900 times.
Compared with ordinary porous materials, aerogel has an important feature: its particle skeleton is on the nanometer scale. Therefore, when visible light passes through, the scatter is small, and it looks like "frozen smoke". Certain properties of nano-scale particles are often enhanced when they exist in the form of aerogels. For example, the electrode material of lithium batteries-manganese dioxide (MnO2), when it exists in the form of aerogel, the discharge performance of lithium batteries has been greatly improved.
The characteristics of aerogel are summarized as light weight, thermal insulation and strong compression resistance.
Application areas of aerogels:
Due to its excellent thermal insulation performance, the application fields of aerogel materials are booming and are in the growth stage of the life cycle. The main application fields currently include: energy equipment, transportation, building materials, clothing daily chemicals, LNG pipelines, consumer electronics, aviation Aerospace, national defense and military industry, etc.
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