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Silica powders of respirable size. IV. The long‐term dissolution of silica powders in dilute hydrofluoric acid: An anisotropic mechanism of dissolution for the coarser quartz powders

1963; Wiley; Volume: 13; Issue: 8 Linguagem: Inglês

10.1002/jctb.5010130806

1934-998X

I. Bergman,

Advanced ceramic materials synthesis

Abstract The study of the rates of dissolution of powders of silica (quartz, tridymite and vitreous silica) of respirable size in 0–1 M‐hydrofluoric acid has been extended to more concentrated acid, to coarser powders and over longer periods. The results have not indicated any major change with dissolution in the overall particle shapes of the powders. For quartz powders of particle diameter greater than 2 μ, however, the results suggest an anisotropic dissolution mechanism, resulting in an unusual increase in the rate of dissolution with time.