Viscosity and Sedimentation In
نویسنده
چکیده
Suspensions of clays in organic liquids change considerably in theological character from liquid to liquid or when additions of a second liquid are made; thus, for example when about 15 per cent. volume of ethyl alcohol was added to a dispersion of a sample of bentonite in water the specific viscosity and thixotropy (as measured 9 by rate of the sol-->gel transition) increased to a maximum in spite of the-fact that alcohol itself yielded low viscosity suspensions. On the other hand, with a sample of kaolin in water the degree of dispersion appeared to be increased by small additions of ethyl alcohol but not by methyl or n-propyl alcohol. There appears to be a close correlation between viscosity changes and the tendency to flocculation and the fine changes with composition can be shown on property-composition curves. Sedimentation volumes and rates of sedimentation form useful data; when water partially replaced alcohol in a 5 grams/100 ccs. bentonite suspension in alcohol there was increased degree of dispersion as indicated by the following data :
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