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Reference.org
Colloidal silica
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<p>Colloidal silicas are suspensions of fine <a href="/facts/Amorphous/YTIzmrR0">amorphous</a>, nonporous, and typically spherical <a href="/facts/Silica/A3WILp6J">silica</a> particles in a liquid phase. It may be produced by <a href="/facts/St%25C3%25B6ber_process/wc1KvHoL">Stöber process</a> from <a href="/facts/Tetraethyl_orthosilicate/nfrzlRuE">Tetraethyl orthosilicate</a> (TEOS). </p>