Published: Jan 1981
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The successive determination of the solution rate in sodium hydroxide or in buffer solutions may serve to establish the extent of surface defects and the thickness of the more or less amorphous layer of silicon dioxide (SiO2) dusts. The solution rate is a sensitive measurement for the energetic and thus crystallographic surface structure. Quartz surface modification due to thermal treatment is shown by examples. Furthermore, it is possible to produce quartz with a “pure” surface. The results of cell and animal experiments performed with crystallographic pure quartz specimens and with the same specimens coated with thin layers of amorphous silica are discussed.
quartz surface, chemical and crystallographic structure, biological effect
Silicosis Research Institute, Bochum,