On the contact conditions for the density and charge profiles in the theory of electrical double layer: From planar to spherical and cylindrical geometry
Résumé
In this paper, starting from the Bogoliubov-Born–Green–Yvon equations of the liquid-state theory, we
formulate two equivalent approaches for the calculation of the total density profile and of the charge density
profile of ionic fluids near nonplanar charged surfaces. In the framework of these approaches, we
establish exact conditions, that a particular point of these profiles should satisfy, in the form of contact
theorems. These contact theorems for the total density profile and the charge density profile are obtained
by direct integration of a system of equations derived from the Bogoliubov-Born–Green–Yvon equations.
The contact theorems for both profiles have nonlocal character. It is shown that the contact value of the
total density profile for uncharged surfaces is characterized by the bulk pressure and the surface tension.
The contact theorems are applied to the cases of spherical and cylindrical surfaces. It is shown that the
contact theorem for the total density profile coincides with the recent results obtained by
W. Silvester-Alcantara, D. Henderson and L.B. Bhuiyan (Mol. Phys., 113, 3403, 2015).
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