Silica polymorph and process for preparing same

Details Silica polymorph and process for preparing same Silica polymorph and process for preparing same

1976-09-27

1978-02-14

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423335, 252449, C01B 3312

Patent

active

040738655

ABSTRACT:
Large crystals of a silica polymorph having a characteristic X-ray diffraction pattern, a specific gravity of 1.70 .+-. 0.05 g/cc. and a mean refractive index of 1.39 .+-. 0.01 after calcination in air at 600.degree. C., are prepared by a hydrothermal process in which fluoride anions are included in the reaction mixture. The crystals, which can be as large as 200 microns, exhibit a substantial absence of infrared adsorption in the hydroxyl-stretching region and also exhibit an exceptional degree of hydrophobicity.

REFERENCES:
patent: 3941871 (1976-03-01), Dwyer et al.

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