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[Chemical Knowledge]：Properties and Uses of Fumed Silica

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Fumed silica is an important raw material for chemical production, with unique properties and a wide range of uses. In this paper, the properties, production methods and uses of fumed silica are introduced in detail, as well as the research status and future development trend in China.

1. the properties of fumed silica

fumed silica is a white, odorless, amorphous silica powder. Due to its special production process, fumed silica has many unique properties:

1. high specific surface area: the specific surface area of fumed silica can reach 200-400m ²/g, which makes it have strong adsorption capacity.
2. high purity: gas phase silica purity of up to 99.9%, almost no impurities.
3. Excellent dispersion: Fumed silica has good dispersion in liquid and can form a stable suspension.
4. good electrical insulation: gas phase silica high resistivity, with good electrical insulation.

2. fumed silica production method

fumed silica production method mainly has two kinds: flame hydrolysis method and chemical vapor deposition method. Among them, the flame hydrolysis method is the most commonly used production method, and its principle is to hydrolyze silicon tetrachloride gas in a hydrogen-oxygen flame to generate silicon dioxide particles.

3. the use of fumed silica

fumed silica as an important chemical raw material, in various fields have a wide range of applications:

1. rubber industry: fumed silica can be used as a rubber reinforcing agent, improve rubber strength, wear resistance and aging resistance.
2. coating industry: fumed silica can be used as thickener, thixotropic agent and anti-settling agent of coatings to improve the storage stability and construction performance of coatings.
3. Ceramic industry: gas phase silica can be used as an additive in ceramics to improve the compactness, strength and toughness of ceramics.
4. Food industry: gas phase silica can be used as a food additive for the production of moisture-proof, anti-caking food raw materials.

4. domestic research status and future development trend

At present, the domestic research on fumed silica is mainly focused on the following aspects:

1. The surface modification of fumed silica is studied to improve its performance in various application fields.
2. Optimize the production process of fumed silica to reduce production costs and improve production efficiency.
3. Develop new application areas and expand the scope of use of fumed silica.

the future, with the continuous development of science and technology, the application of fumed silica in various fields will be more extensive. At the same time, with the continuous improvement of environmental awareness, the environmental performance requirements of fumed silica will be more stringent. Therefore, the future research and development trend of fumed silica will pay more attention to the direction of environmental protection, high efficiency and multi-function.

In short, fumed silica is an important raw material for the production of chemical products with unique properties and a wide range of uses. In the future development, we need to continuously deepen the research on the properties and applications of fumed silica to meet the needs of different fields and promote the sustainable development of the chemical industry.

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