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Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO 2, commonly found in nature as quartz. [5] [6] In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and abundant families of materials, existing as a compound of several minerals and as a synthetic product.
2.4 Silicon Dioxide production. 3 ... Molar mass: 154.279 g ... Impregnation of wood with a potassium silicate solution is an easy and low-cost way for rendering the ...
Molar mass: 60.08 g/mol ... Silica gel is an amorphous and porous form of silicon dioxide ... An aqueous solution of sodium silicate is acidified to produce a ...
Molar mass: 60.083 g·mol −1 Appearance white solid Density: 1.76 g/cm 3: Melting point: ... It is one of several forms of silicon dioxide. It is a white solid.
The subunits of colloidal silica particles are typically in the range of 1 to 5 nm. Whether or not these subunits are joined depends on the conditions of polymerization. Initial acidification of a water-glass (sodium silicate) solution yields Si(OH) 4. If the pH is reduced below 7 or if salt is added, then the units tend to fuse together in chains.
Sodium silicate solutions can also be used as a spin-on adhesive layer to bond glass to glass [21] or a silicon dioxide–covered silicon wafer to one another. [22] Sodium silicate glass-to-glass bonding has the advantage that it is a low-temperature bonding technique, as opposed to fusion bonding. [21]
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This also includes water, potentially producing silicon dioxide, chlorine, hydrogen, hydrogen chloride (and its aqueous form hydrochloric acid), and heat. Trichlorosilane can cause hazardous chemical reactions with moisture and humidity alone, and should be handled and stored under inert gas . [ 8 ]