Abstract
Potential distribution and charge density on the clay colloid surface with interacting double layers was solved numerically by computer using the anion negative adsorption equation. The results showed that the interacting degree of double layers affected not only the potential, Ψd, at the midplane but also the potential Ψδ at the outer Helmholtz plane (OHP). The magnitude of Ψd increased remarkably as flat colloid particles approached each other at first and then remained almost constant at the distance of less than 70Å between two colloid particles. Therefore, it is more appropriate to use Ψd/Ψδ to describe the interacting degree of double layers than Ψd as in previous studies. When Ψd/Ψδ is smaller than 0.6-0.8, the surface charge density, σδ, is almost unchanged with the increase of the interacting degree of electric double layers. When Ψd/Ψδ exceeds 0.6-0.8, Na+ in the diffuse layer may enter into OHP and neutralize the partial surface charge so as to lead to a reduction of the charge density at OHP. The results obtained in this paper are in good agreement with theoretical expectation.
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