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XL. The electrical double layer at the interface of two liquids

1939; Taylor & Francis; Volume: 28; Issue: 189 Linguagem: Inglês

10.1080/14786443908521199

1941-5990

E. J. W. Verwey, K. F. Niessen,

Electrochemical Analysis and Applications

Summary The potential function at the interface of two liquid phases about which a small amount of electrolyte is distributed is considered. The total potential drop D, due to the circumstance that one phase contains an excess of positive ions and the other an equal excess of negative ions, is divided up into two parts, occurring on both sides of the interface, the size of which is governed by (n = ionic concentrations, K=dielectric constants) and Fig. 1 shows a typical potential curve, fig. 2 the corresponding charge curve, for small values of D. The largest part of the potential drop occurs in the phase where the product nK has the smallest value. For the general case that a differs appreciably from one practically the whole potential drop occurs in one phase, provided D is not very large. This does not necessarily imply that the rates of decay of the charge density on both sides of the interface are very different. For larger values of D the partition of the potential drop about both phases becomes less unequal, and approaches equal parts on both sides for very large values of D (fig. 3, where -z1 and z2 are proportional to the partial potential drop in liquid 1 resp. 2).