What is silicon dioxide?
Silicon dioxide is an inorganic compound substance with the chemical formula of SiO2. Silicon and oxygen atoms are arranged in a long-term order to form crystalline silicon dioxide and in short-term order or long-term disorder to form amorphous silicon dioxide. Silica existing in nature, such as quartz, and quartz sand, is collectively called silica. Pure quartz is a colorless crystal. Large and transparent prismatic quartz crystals are called crystals. Those with trace impurities and purple are called amethyst. Those with light yellow, golden yellow, and brown are called smoky crystals. Sand is a fine particle of quartz mixed with impurities. Opal and diatomite are amorphous silica.
Silicon dioxide crystal
In silicon dioxide crystals, silicon atoms are located at the center of a regular tetrahedron, and four oxygen atoms are at the four top corners. Many of these tetrahedrons are connected by oxygen atoms at the top corners. Two tetrahedrons share each oxygen atom; each oxygen atom is bound to two silicon protons. The most straightforward formula for silica is SiO2, but SiO2 does not represent a simple molecule (only the ratio of the number of atoms of silicon and oxygen in the silica crystal). Pure natural silica crystal is a complex, brittle, and insoluble colorless transparent solid.
Chemical properties of silica
The chemical properties are relatively stable. Does not react with water. It is an acidic oxide and does not react with general acids. Hydrofluoric acid reacts with silicon dioxide to produce gaseous silicon tetrafluoride. React with a hot concentrated alkali solution or molten alkali to make silicates and water. React with various metal oxides at high temperatures to form silicates. The physical properties of crystalline silicon dioxide are as follows: density 2.2 g/cm3, melting point 1723 ℃, boiling point 2230 ℃, refractive index 1.6, changes during heating: melting with strong alkali during heating, producing silicate with solubility insoluble in water, and able to react with HF to make gaseous SiF4.
The use of silica
Silica is the raw material for manufacturing glass, quartz glass, water glass, optical fiber, essential parts of the electronic industry, optical instruments, handicrafts, and refractory materials. It is an important material for scientific research. In addition, silica can also be used as a lubricant and is an excellent flow promoter, mainly as a lubricant, anti-stick agent, and flow aid. Especially suitable for the granulation of oils and extracts, the particles produced have good flowability and compressibility. It can also be used as a flow aid in direct tablet pressing. As a disintegrating agent, it can significantly improve particle fluidity, increase bulk density, increase the hardness of the prepared tablets, shorten the disintegration time, and increase the drug dissolution rate.
Price of silicon dioxide
Silicon dioxide particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Silicon dioxide. A large amount of large amount will be lower. The Price of silicon dioxide is on our company's official website.
Silicon dioxide supplier
Mis-Asia is a reliable and high-quality global chemical material supplier and manufacturer. It has over 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including silicon dioxide, nitride powder, graphite powder, sulfide powder, and 3D printing powder. You can contact us or inquire any time if you are looking for high-quality and cost-effective silicon dioxide.