Spherical sio2 particles

Details Spherical sio2 particles Spherical sio2 particles

C - Chemistry, Metallurgy

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C01B 33/18 (2006.01) B01D 15/08 (2006.01) B01D 15/32 (2006.01) B01J 20/10 (2006.01) B01J 20/32 (2006.01) C01B 33/16 (2006.01)

Patent

CA 1280399

Abstract The invention relates to highly monodispersed non- porous spherical SiO2 particles having mean particle diameters between 0.05 and 10 µm with a standard deviation of not more than 5% and also to a method for the prepar- ation of such particles by hydrolytic polycondensation of tetraalkoxysilanes in aqueous/alcoholic ammoniacal medium, a sol of primary particles first being prepared and the SiO2 particles then being converted to the desired par- ticle size by a continuous measured addition of tetraal- koxysilane controlled by the extent of the reaction, and also to the use of such SiO2 particles as sorption material in chromatography.

518938

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