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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 15, Number 6
JKCSEZ 15(6)
December 20, 1971 

Effect of Electrolytes on Flow Properties of Aqueous Bentonite Suspension
Kisoon Park, Taikyue Ree, Henry Eyring
Dependence of the flow behavior of aqueous suspension of Black Hills bentonite on the concentration and the type of electrolytes was studied. The flow properties were measured with a Couette-type rotational viscometer. On addition of monovalent cations, the apparent viscosity determined from the reproducible flow curves (shear rate vs. shear stress) decreased followed by a rise as the ionic concentration further increased. Addition of multivalent cations (di-and tri-) resulted in the viscosity which increased to a maximum then decreased to a constant value. Anions of different charges produced essentially the same relationship between viscosity and electrolyte concentration. The flow behavior of the electrolyte-containing suspensions was rationalized in terms of the Derjaguin-Landau-Verwey-Overbeek theory of colloidal stability and the generalized theory of viscosity.
303 - 312
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