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We present a generalization of the Debye-Huckel free-energy-density functional of simple fluids to the case of two-component systems with arbitrary interaction potentials. It allows one to obtain the two-component Debye-Huckel integral equations through its minimization with respect to the pair correlation functions, leads to the correct form of the internal energy density, and fulfills the virial theorem. It is based on our previous idea, proposed for the one-component Debye-Huckel approach, and which was published recently cite{Piron16}. We use the Debye-Kirkwood charging method in the same way as in cite{Piron16}, in order to build an expression of the free-energy density functional. Main properties of the two-component Debye-Huckel free energy are presented and discussed, including the virial theorem in the case of long-range interaction potentials.
The Debye-Huckel approximation to the free-energy of a simple fluid is written as a functional of the pair correlation function. This functional can be seen as the Debye-Huckel equivalent to the functional derived in the hyper-netted chain framework
In previous publications [arXiv:1608.08430, arXiv:1704.06502], the authors have proposed Debye-Huckel-approximate free-energy functionals of the pair distribution functions for one-component fluid and two-component plasmas. These functionals yield th
Classical MD data on the charge-charge dynamic structure factor of two-component plasmas (TCP) modeled in Phys. Rev. A 23, 2041 (1981) are analyzed using the sum rules and other exact relations. The convergent power moments of the imaginary part of t
Electrostatic interactions between point charges embedded into interfaces separating dielectric media are omnipresent in soft matter systems and often control their stability. Such interactions are typically complicated and do not resemble their bulk
In a previous paper we showed that dynamical density shocks occur in the non-relativistic expansion of dense single component plasmas relevant to ultrafast electron microscopy; and we showed that fluid models capture these effects accurately. We show