David C. Grahame developed a quantitative treatment of the electric double layer and electrocapillarity. His analysis combined the Poisson equation with the Boltzmann distribution and distinguished accumulated interfacial charge, integral capacitance, and differential capacitance.[ref]
The Electrical Double Layer and the Theory of Electrocapillarity by David C. Grahame. 1947, section VI, pp.470–474, equations43–48
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