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General
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A
colorless, high-purity form of silica is called fumed silica.
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Fumed
silica is an enterosorbent, i.e. an agent that absorbs and removes
substances harmful and toxic to the body from intestinal tract.
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Fumed
silica has a chain-like particle morphology.
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Fumed
silica is composed of submicron-sized spheres, which are 40-60% fused
into short chains, very highly branched, 0.1-0.2 microns long.
Process
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Fumed
silica is manufactured by a similar flame hydrolysis process to
synthetic fused silica.
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Fumed
silica (FS) particles are dispersed in different oligoethers and in
high-molecular weight poly(ethylene oxide) PEO and their properties
evaluated with the aim to fine tune them for improved performance.
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Fumed
silica is prepared by the flame hydrolysis of silicon tetrachlot-ide
(Sit&) in a flame of Hz and 02.
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Synthesis
of non-agglomerated, spherical fumed silica particles in a flame aerosol
reactor using laminar and turbulent classic and double diffusion flames
has been studied.
Application
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Fumed
silica is effective and integral component in adhesive and sealant
systems.
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Fumed
silica is used on large scale in the production of toothpaste. It keeps
teeth enamel safe providing excellent polish and serves as a carrier of
active ingredients in gel toothpaste.
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Fumed
silica functions as a stabiliser and anti-settling agent of pigments and
as an anti-sedimentation additive.
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Fumed
silica is active reinforcing filler used in the production of silicon
rubbers.
Technology
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Polymerization compounding technique is used to improve the properties
of ultrafine silica-based polyurethane composites. Fumed or ultrafine
silica is a widely used inorganic filler in the composite industries.
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The
structure of nanometer sized silica particles called fumed silica, which
can be produce by burning silicon tetrachloride in an oxygen-hydrogen
flame using infrared and raman spectroscopies and high energy
x-diffraction technique.
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One
production method for the production of fumed silica involved a
continuous flame hydrolysis technique.
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