What are the unique structures and properties of fumed silica?
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Author : lql
Update time : 2023-02-06 12:29:47
What is Fumed silica? Fumed silica (fumed silica) is one of the most important new high-tech superfine inorganic materials. Because of its small particle size, it has a large specific surface area, strong surface adsorption, large surface energy, high chemical purity, good dispersion, thermal resistance, electrical resistance and other special properties. With its superior stability, reinforcement, thickening and thixotropy, it has unique characteristics in many disciplines and fields and plays an irreplaceable role.
Production technology of fumed silica powder The preparation method of fused quartz powder includes the following steps: 1. Crushing; 2. fine grinding; 3. pickling to remove impurities; 4. Ultrasonic cleaning; 5. high-temperature fusion; 6. rapid cooling and grinding. The preparation method by manual screening, pickling to remove impurities, high-temperature melting, quenching, grinding, and other processes, layer by layer check, to produce a high-quality fused quart. Characteristics of Fumed silica Powder 1.unique "three-dimensional dendritic" structure In the production process of fumed silica, firstly, halosilane is condensed into a single silica particle and then gradually grows into a spherical particle of 7-40 nm, which is called the "Primary Particle" of silica. 2.high surface activity In the process of high-temperature hydrolysis and condensation of fumed silica, some silicon groups (Si-OH) remain on the surface. The existence of silicon groups on the surface makes fumed silica have strong surface polarity and high surface activity. 3.small particle size and large specific surface area The "primary particle size" of fumed silica is 7-40nm. What is this concept? We can understand it from the comparison of the data in the following table. If we enlarge a fumed silica particle to the size of a standard football, we need to enlarge it by about 30 million times; If you enlarge the football by about 30 million times in equal proportion, it will become as big as Mars. Due to the small particle size of fumed silica, its specific surface area is very large. Usually, the specific surface area of fumed silica is 100-400 m2/g. Usually, the indoor area of a 150m2 house is about 120m2. That is, if we use the fumed silica product (such as HL-150) with the lowest specific surface area in the current market, the specific surface area of less than 1g can cover the whole indoor area of the house! And if the product with a high specific surface area (such as HL-380) is only 18.8g, its specific surface area is equivalent to the area of a standard football field! Because of its small particle size and large specific surface area, fumed silica has good adsorption performance, which can be widely used in the fields of catalyst, food, medicine, thermal insulation materials, etc., and has the functions of adsorption, anti-caking, and heat insulation. Price of Fumed silica powder Fumed silica powder particle size and purity will affect the product's price, and the purchase volume can also affect the cost of Fumed silica powder. A large amount of large amount will be lower. The price of Fumed silica powder can be found on our company's official website. Fumed silica powder supplier Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Fumed silica powder, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Fumed silica powder, you are welcome to contact us or inquire any time.
