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Principles of Colloid and Surface Chemistry, Revised and Expanded, 3rd Edition by Raj Rajagopalan, Paul C. Hiemenz

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11

The Electrical Double Layer and Double-Layer Interactions

Suppose that I had the power of passing through things, so that I could penetrate my subjects, one after another, even to the number of a billion, verifying the size and distance of each by the sense of feeling.

From Abbott’s Flatland

11.1  INTRODUCTION

11.1a  What Is an Electrical Double Layer?

When ions are present in a system that contains an interface, there will be a variation in the ion density near that interface that is described by a profile like that shown in Figure 7.13. The boundary we identify as the surface defines the surface excess charge, as explained in Chapter 7. Suppose that it was possible to separate the two bulk phases at this boundary in the manner shown in ...

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