supply fumed silica ss150 By shandong jinguang frp group co., ltd, China
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supply fumed silica ss150

supply fumed silica ss150

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shandong jinguang frp group co., ltd

shandong jinguang frp group co., ltd

China

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Personne à contacter Mr. shengqiang

dongfanghong, Dechuan, Shandong

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Description

Silicon tetrachloride is burned in a flame of hydrogen and oxygen(at approximately **00℃) to produce molten spheres of silicon dioxide(and hydrogen chloride). Depending on process parameters, the size of these silica spheres can be varied and, in a given batch, show excellent uniformity(by electron micrograph). The molten spheres collide and fuse with one another to form branched, three-dimensional chain-like aggregates.
Many aggregates have chains from *0 to *0 spheres in length, or from0.1 to 0.2 microns(um) in length. As the aggregates cool down below the fusion temperature of silica(approximately **10℃),further collisions result in some reversible mechanical entanglement or agglomeration. Further agglomeration occurs during the collection process; this can be reversed by proper dispersion in a suitable medium.
During the formation of the product, hydroxyl groups become attached to some of the silicon atoms on the surface of silica particles, making the surface hydrophilic and capable of hydrogen bonding with suitable molecules. There are (estimated)3.**4.5 hydroxyl groups per square millimicron of silica surface, compared to a theoretical maximum of 7.*5. The structure of fumed silica is amorphous (as indicated by absence of lines in its X-ray diffracetion pattern.)
The surface area was determined by calculation using a nitrogen adsorption method of brunauer,and the value used to calculate particle diameter.
The residual hydrogen chloride on the surface of the fumed silica was reduced to less than **0ppm by calcining. The moisture content of the product will vary,depending on storage conditions. moisture adsorbed on the surface can be removed by evacuation at room temperature (at ***2mm Hg) or by heating at **0℃,(if the product is heated above **0℃,it sinters irreversibly.)
 

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Mr. shengqiang < Chifeng Shengsen silicon industry development co., ltd >

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