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By Dr.Qian from Guizhou University of Finance and Eco | 15 July 2020 | 0 Comments

Practical guide of silica aerogel powder

What's Silica aerogel?
Silica aerogel is the maximum commonplace form of aerogel. Silica aerogels are lightweight and highly porous materials with a network of three-dimensional silica particles. This is obtained by extracting the liquid phase of silica gel under super critical conditions.
 
Structure and density as well as properties of a Silica Aerogel

Silica gels are composed of two components—a strong, nanoporous silica-primarily based framework which gives the gel its stress and stable form, and a liquid which permeates the pores of the framework.The stable framework which makes up a silica aerogel is composed of nanoparticles of silica—the oxide of silicon—just like glass, quartz, or sand (even though those varieties of silica often have other components mixed in). The way those nanoparticles join collectively to form the framework of the aerogel can vary, and is normally a result of the chemistry used to prepare the aerogel precursor gel. In an silica aerogel produced via a typical base-catalyzed alkoxide sol-gel system, nano-sized primary particles of silica 2-50 nm in diameter are agglomerated into round secondary debris 50 nm-2 um (2000 nm) in diameter which might be then in flip related collectively in strands in a “string of pearls” kind structure, that you might see if you have been to look at the aerogel below a scanning electron microscope (SEM). In silica aerogels produced via an acid-catalyzed sol-gel system, the smaller number one particles do now not agglomerate into larger round secondary debris and are instead connected in a leaf-like morphology.Silica aerogels are high-quality regarded for combining high optical transparency with notably low thermal conductivity, that can take on values as low as zero.0.5 W m-1 okay-1. That’s something just like the equal insulating value of a stack of 30 panes of window glass compacted right into a unmarried inch (2.54 cm)!
 
Syhthesis and applications of Silica Aerogel
The silica aerogel powder was prepared by water glass and ambient pressure drying over 4 hours. Water glass is hydrolyzed in water using HCl as the acid catalyst. In order to reduce the consumption of modifiers and the preparation cycle, a new process for mechanical crushing and filtration has been introduced, and the solvent exchange/surface modification process can be quickly performed in this way. In addition, we replaced NH3·H2O with water glass as a base catalyst. In a way, it prevents impurities from entering the aerogel. It has been shown that alkali concentration has a very important influence on the physical and chemical properties of aerogels. As a result, when the dilution ratio of the water glass as the base catalyst is 3, an aerogel having a well-developed mesoporous structure (average pore diameter of ~20 nm) and superhydrophobicity (contact angle of ~162°) can be obtained.
 
Silica aerogels are produced through the sol-gel process, in which nanoparticles suspended in a liquid answer (i.e., a sol) are invoked to interconnect and shape a continuous, porous, nanostructured network of particles across the quantity of the liquid medium (i.e., a gel).
Silica aerogels have observed a big selection of uses, mainly in high-tech technological know-how and engineering, and are beginning to go into the industrial mainstream. Because they excellent characteristics such as extremely low thermal conductivity, low density, high porosity, and high specific surface area,, they have discovered excellent potential applications in the aerospace industry Besides, it is used in the earth area for environmental cleanup and protection, heat storage equipment, transparent window systems, thickeners in paints, etc.
TRUNNANO (Luoyang Trunnano Tech Co., Ltd ) is a professional Silica aerogel  manufacturer with over 12 years experience in chemical products research and development. If you are looking for high quality Silica aerogel , please feel free to contact us and send an inquiry.


 

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