Información del autor
Autor Fernández Tejero, Carlos |
Documentos disponibles escritos por este autor (44)
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A simple approximate analytical expression for the direct correlation function of a hard-sphere fluid in D dimensions within the Percus-Yevick equation is proposed. The approximation exactly reproduces the well-known results for D = 1 and D = 3,[...]texto impreso
In this paper we present an alternative formulation of the well-known integral equation approximations designed to keep a consistent approach to the determination of thermodynamic properties in the case of density-dependent interactions. Obvious[...]texto impreso
The direct correlation function of a Huid of aligned planar hard convex orientable bodies is determined exactly using a simple form for the separation of the centers at contact. An approximate analytical proposal for the direct correlation funct[...]texto impreso
Two analytic approximations for the direct correlation function of a hard-sphere fluid are considered. The first follows from a generalization of the Percus-Yevick result in d dimensions whereas the second arises in the Rational Function Approxi[...]texto impreso
Cuesta, J. A. ; Fernández Tejero, Carlos ; Xu, H. ; Baus, Marc | American Physical Society | 1991-10-15Recent attempts to generalize the classical Onsager theory of nematic ordering to finite-density systems of finite-length hard convex bodies are related and compared. It is pointed out that, although good results can be obtained in three-dimensi[...]texto impreso
The high-frequency elastic behavior of fluid surfaces is studied from first principles. The general dispersion equation for elastic surface waves thus obtained reveals the influence of the surface structure on Rayleigh's surface waves. New types[...]texto impreso
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Almarza, N. G. ; Lomba, Enrique ; Ruiz, Guiomar ; Fernández Tejero, Carlos | American Physical Society | 2001-03-05Evidence of a liquid-liquid equilibrium in simple fluids has recently been exposed for a density-dependent pair potential in the framework of a van der Waals theory. Here this double criticality is investigated by means of computer simulation, a[...]texto impreso
A theoretical study of the freezing of adhesive hard spheres within the generalized-effective-liquid approximation has been performed. The liquid-solid phase diagram exhibits most of the trends observed for simple liquids. There is, however, no [...]texto impreso
It is well-known that the Lennard-Jones potential provides a fair description of the phase diagram of a simple atomic fluid with a fluid-fluid critical point and a fluid fluid-solid triple point. In this chapter we analyze the modifications occu[...]texto impreso
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The real space version of the modified weighted density approximation is investigated in order to determine the effective liquid density that is used to represent a face centered cubic hard-sphere solid. It is shown that above a threshold averag[...]texto impreso
We apply the differential formulation of the generalized effective liquid approximation to the study of hard-sphere and hard-disk freezing. We show that the thermodynamic properties of the solid phase are rather insensitive to the compressibilit[...]texto impreso
Starting from the Nernst-Planck, Navier-Stokes and Poisson equations for the local description of the electrokinetic phenomena in a charged membrane model, we have studied the behaviour of the electroosmotic permeability coefficient. We show tha[...]texto impreso
Linearized hydrodynamic equations for a nonuniform anisotropic fluid are obtained from the exact Mori-Zwanzig equations for the conserved densities. In the particular case of a two-phase system with a planar equilibrium interface, these equation[...]texto impreso
Fernández Tejero, Carlos ; Daanoun, A. ; Lekkerkerker, H. N. W. ; Baus, M. | American Physical Society | 1995-01A variational approach based on the Gibbs-Bogoliubov inequality is used in order to evaluate the free energy of simple fuids described by a double-Yukawa pair potential. A hard-sphere reference fuid is used to describe the fuid phases, and an Ei[...]texto impreso
Density-functional theory within the effective-liquid approximation is applied to the problem of the isotropic-nematic transition of D-dimensional hard convex bodies. It is shown that the free-energy functional factorizes into its radial and ang[...]texto impreso
The orientational freezing of a system of hard ellipses, as a first approximation for a nematogen adsorbed on a smooth substrate, is studied with the aid of an approximate density-functional theory used previously for the study of hard ellipsoid[...]texto impreso
We show how a van der Waals theory of simple fluids with an interaction potential whose range has a nonmonotonic density dependence can lead to a liquid-liquid transition in close analogy to recent observations and simulations.texto impreso
The fluid-solid equilibrium of a system of hard spheres with embedded classical Heisenberg spins is studied by means of computer simulation and various combinations of density functional theories with the spin-spin contributions treated at the l[...]texto impreso
García Almarza, Noé ; Lomba, Enrique ; Ruiz, G. ; Fernández Tejero, Carlos | American Physical Society | 2003-02In a recent paper [Phys. Rev. Lett. 86, 2038 (2001)] a simple fluid with a particular density-dependent pair potential was shown to exhibit, together with the vapor-liquid transition, a liquid-liquid phase separation and it was evidenced that, i[...]texto impreso
A novel method for evaluating two?spin correlations of a one?dimensional Ising model is described. The method is based on an algebraic technique motivated by renormalizationgroup theory and adapted for presentation in a graduatestatistical physi[...]texto impreso
The exact evolution equations for the conserved densities of a one-component two-phase fluid are reduced, in each bulk phase to the corresponding linearized hydrodynamic equations and at the interface, to boundary conditions, relating the jump i[...]texto impreso
The modified weighted density approximation is investigated in order to determine the thermodynamics of the ordered CsCl and NaCl structures. Our results indicate that one of the essential assumptions of the theory, namely, the uniform fluid lim[...]texto impreso
The compressibility equation of a fluid with an effective, state-dependent, pair-potential is derived. It is shown that the thermodynamic states for which the infinite wavelength limit of the static structure factor diverges are not consistent w[...]