Model of the double-layer of Helmholtz
This model describes the variation of the electric Potentiel in the vicinity of a surface, and holds a great role in the explanation of the behavior of surfaces put in contact with solution S.
Historical development of the model
One often allots the first model of the electronic double-layer to Helmholtz (1879). This one regarded the double-layer mathematically as a simple condenser, being based on a physical model in which a single layer of ions is absorbed on the surface.
Later, Gouy and Chapman (1910-1913) made large projections by introducing a diffusive model of the double-layer, in which the potential on a surface decrease exponentially, because of absorptive against-ions.
The current model is that of Gouy-Chapman-Stern, which combines….
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