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Electrical double layer
Additional recommended knowledge
Historical development of double layer models
The earliest model of the electrical double layer is usually attributed to Helmholtz (1879). Helmholtz treated the double layer mathematically as a simple capacitor, based on a physical model in which a single layer of ions is adsorbed at the surface.
Later Gouy and Chapman (1910-1913) made significant improvements by introducing a diffuse model of the electrical double layer, in which the potential at a surface decreases exponentially due to adsorbed counter-ions from the solution.
The current classical electrical double layer is the Gouy-Chapman-Stern model, which combines the Helmholtz single adsorbed layer with the Gouy-Chapman diffuse layer. Important approximations used in this model are:
Classical models of electrical double layer are not suited for the fast ion conductor/metal interface as the concentration of mobile ions in solid ion conductor can be extremely high, Ni~1022/cm3.
Distribution of cations and anions next to clay surface is continuous
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Electrical_double_layer". A list of authors is available in Wikipedia.|