Aerogel is a general term for a class of nanoporous materials, usually derived from wet gel, who has a three-dimensional network structure composed of nanoparticles, which is filled with gas dispersion medium. Its special nanoporous structure gives it unique thermal, optical, acoustic and electrical properties. It has set 15 Guinness World records and was hailed by science magazine as a "magical material that changes the world".
There are many kinds of aerogel, including silicon system, carbon system, sulfur system, metal oxide system, metal system, etc.
Among them, silica aerogel is the most widely used and industrialized one of the most mature aerogel, which is also called "frozen smoke" or "blue smoke" and is the lightest solid material in the world. It is a kind of high temperature resistant aerogel which has been studied most in the field of heat insulation.
Silica aerogel materials are usually composite with infrared sunscreens and intensifiers to improve the thermal insulation and optical properties of silica aerogel, so that it has practical value of nanoporous super insulation material.
Mainly used in aerospace, military, electronics, new energy vehicles, construction, household appliances, industrial equipment, oil pipelines and other fields of heat insulation, energy conservation and emission reduction.
Silica SiO2 Aerogel Properties
Silica aerogel material has very low thermal conductivity, which can reach 0.013-0.016W/(m·K), lower than static air (0.024W/(m·K)) thermal conductivity, 2-3 orders of magnitude lower than the corresponding inorganic insulation material.
Even at 800℃, its thermal conductivity is 0.043W/(m·K). No decomposition under high temperature, no harmful gas release, belongs to the green environmental protection material. Silica aerogel can be made into various thermal insulation materials after compounding with various heat-resistant fibers. It can be widely used in industry, construction, pipeline, automobile, aerospace and other fields.
Silica aerogel is also an ideal acoustic delay or high-temperature acoustic insulation material due to its low sound velocity properties. The material has a wide acoustic impedance variable range (103-107 kg/m2·s), which makes it an ideal acoustic impedance coupling material for ultrasonic detectors. Preliminary experimental results show that a silicon aerogel with a density of about 300 kg/m3 as the coupling material can increase the sound intensity by 30dB, and a higher sound intensity gain can be expected if a silicon aerogel with a density gradient is used.
Nonlinear optical properties:
Due to the formation of quantum dot structure in the nanoparticle network of silica aerogel, the results of mixing Si by chemical gas osmosis method and C60 by solution method show that the dopant exists in the form of nano grain, and the strong visible light emission is observed, which provides strong evidence for the quantum confinement effect of porous silicon luminescence. Based on the structure of silica aerogel and the nonlinear optical effect of C60, a new type of laser protective lens can be further developed.
Filtration and catalytic properties:
Nano-structured aerogel can also be used as a new type of gas filtration material. Different from other materials, this material is a highly efficient gas filtration material with uniform pore size distribution and high porosity. Because the material is particularly large than the surface product. Aerogel also has a broad application prospect as a new catalyst or catalyst carrier.
Refractive index tunability:
The refractive index of silica aerogel is close to L, and the ratio of the annihilation coefficient of infrared and visible light is more than 100, which can effectively pass through the visible part of sunlight and block the infrared part, becoming an ideal transparent insulation material, which has been applied in the utilization of solar energy and building energy saving.
Silica SiO2 Aerogel Supplier
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