Electrostatics and Electrical Double Layers

5 important questions on Electrostatics and Electrical Double Layers

Which ions absorb to surfaces?

Monocalent ions will not absorb to surfaces, but multivalent ions may.

What does Helmoltz model describe?

Surface charge is counterbalanced by oppositely charged ions, at fixed (…) distance from the interface

What does the Gouy-Chapman model propose?

Average ion concentrations ni (x) change (gradually and differently for co-ions or counter-ions.)
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How can we describe the resulting potential vs. distance difference?

Cominbing poisson and boltzmann equation.

What is the Debye Length?

The Debye length is a measure of how far into the plasma the potential of an electrode or probe is observed. It can be expressed as

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