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Colloidal Stability in Aqueous Suspensions

From Brookhaven Instruments Corporation

Abstract Zeta potential in aqueous suspensions is a function of two variables: charge at the shear plane and free salt ion concentration. [Free here means not attached to the particle surface.] If a dispersant that is added to increase the surface charge density (increase stability) is too concentrated, the contribution it makes to the free salt ion concentration is counterproductive (promotes instability).

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