Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1993-09-17
1995-06-20
Straub, Gary P.
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
423335, C01B 3312
Patent
active
054259304
ABSTRACT:
A process for producing microspheres of silica having a maximum diameter of at least 2.5 .mu.m particularly about 2.5 .mu.m to 10 .mu.m from the hydrolysis of a silica precursor, such as a tetraalkoxysilane, which is characterized by employing precursor solutions and feed rates which initially yield a two-phase reaction mixture and beginning the hydrolysis reaction with solutions cooled below ambient temperatures, preferably below about 10.degree. C. Either monodisperse or polydisperse microspheres may be formed.
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Stober et al., "Controlled Growth of Monodisperse Silica Spheres in the Micron Size Range", Jour. of Colloid & Interface Sci., 26, 62-69 (1968).
Allied-Signal Inc.
Boldingh Mary Jo
Criss Roger H.
Nguyen N. M.
Straub Gary P.
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