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thickness of electrical double layer

The length characterizing the decrease with distance of the potential in the double layer = characteristic Debye length in the corresponding electrolyte solution = κ −1:
1 κ = ɛ r ɛ 0 R T F 2 ∑ i c i z i 2
(rationalized four-quantity system)
1 κ = ɛ r R T 4 π F 2 ∑ i c i z i 2
(three-quantity electrostatic system)
where ɛ = static permittivity = ɛ r ɛ 0, ɛ r = relative static permittivity of solution; ɛ 0 = permittivity of vacuum, R = gas constant, T = thermodynamic temperature, F = Faraday constant, c i = concentration of species i, z i = ionic charge on species i.
PAC, 1972, 31, 577 (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 619
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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