A van der Waals free energy in electrolytes revisited
Laboratoire de Physique Théorique, Université de Paris-Sud, Unité Mixte de Recherche 8627 CNRS, Bâtiment 210, 91405, Orsay Cedex, France
Published online: 27 December 2005
A system of three electrolytes separated by two parallel planes is considered. Each region is described by a dielectric constant and a Coulomb fluid in the Debye-Hückel regime. In their book Dispersion Forces, Mahanty and Ninham have given the van der Waals free energy of this system. We rederive this free energy by a different method, using linear response theory and the electrostatic Maxwell stress tensor for obtaining the dispersion force.
© EDP Sciences/Società Italiana di Fisica/Springer-Verlag, 2006