Spherical SiO.sub.2 particles

Details Spherical SiO.sub.2 particles Spherical SiO.sub.2 particles

1986-09-25

1988-10-04

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423338, 423339, 502 8, C01B 3312

Patent

active

047755202

ABSTRACT:
Highly monodispersed nonporous spherical SiO.sub.2 particles are prepared having mean particle diameters between 0.05 and 10 .mu.m with a standard deviation of not more than 5% and a method for the preparation of such particles. The particles can be produced by a two step process wherein first a sol of primary particles is prepared by hydrolytic polycondensation of tetraalkoxysilanes in an aqueous/alcoholic ammoniacal medium. The SiO.sub.2 particles are then converted to the desired particle size by a continuous measured addition of tetraalkoxysilane or organotrialkoxysilane controlled by the extent of the reaction. The SiO.sub.2 particles produced by this process are particularly useful as sorption material in chromatography.

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patent: 4422880 (1983-12-01), Wason et al.
patent: 4567030 (1986-01-01), Yuasa et al.

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