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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,[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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.![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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We present a new method for the study of a one-dimensional inhomogeneous Ising chain with nonconstant nearest neighbor interactions. The external field required to produce a given magnetization profile is derived exactly. Some properties of the [...]![]()
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The free energy of classical two-dimensional solids with repulsive inverse-power interactions is obtained from a recently introduced perturbation theory. We obtain very accurate results for the thermodynamics of the solid phase as compared to th[...]![]()
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Fernández Tejero, Carlos ; Daanoun, A. ; Lekkerkerker, H. N. W. ; Baus, M. | American Physical Society | 1994-08-01It is shown that strongly reducing the range of the attractions of a simple fluid will transform its phase diagram from the usual type, with a fluid-fluid critical point and a fluid-fluid-solid triple point, into its fluid-solid mirror image, wi[...]![]()
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Lomba, Enrique ; López Martín, J. L. ; Cataldo, H. M. ; Fernández Tejero, Carlos | American Physical Society | 1994-06A recently proposed entropic criterion [P.V. Giaquinta and G. Guinta, Physica A 187, 145 (1992)] for the determination of phase transitions in simple fluids is applied to two-fluid models, a purely repulsive point Yukawa fluid, and a 6-12 Lennar[...]![]()
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The pressure of the face-centered cubic hard-sphere crystal is analyzed using two different density functional theories: the generalized effective liquid approximation and the modified weighted density approximation. It is shown that in both the[...]![]()
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The demixing transition of a binary fluid mixture of additive hard spheres is analyzed for different size asymmetries by starting from the exact low-density expansion of the pressure. Already within the second virial approximation the fluid sepa[...]![]()
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Exact analytical expressions for the excluded volume and the second virial coefficient of the D-dimensional hard Gaussian overlap model are obtained. The functional form of the excluded volume is proven to be independent of D provided D greater-[...]![]()
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The stability of the hard-sphere icosahedral quasilattice is analyzed using the differential formulation of the generalized effective liquid approximation. We find that the icosahedral quasilattice is metastable with respect to the hard-sphere c[...]![]()
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The structure of the liquid surface is shown to lead to the appearance of new surface waves which are studied both in the high-frequency elastic domain and in the low-frequency hydrodynamic domain. The experimental observation of these surface w[...]![]()
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Effective interactions in soft-matter physics result from a formal contraction of an initial multicomponent system, composed of mesoscopic and small particles, into an effective one-component description. By tracing out in the partition function[...]![]()
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Ruiz, G. ; Anta Montalvo, Juan Antonio ; Fernández Tejero, Carlos | Institute of Physics | 2003-12-10The low-density phase diagrams of charge-stabilized colloidal suspensions of the Derjaguin-Landau-Verwey-Overbeek theory with an approximate effective one-component Hamiltonian given by the volume term and effective pair interactions, and of the[...]![]()
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The Wilson-Frenkel growth law of colloidal crystals formed in charge-stabilized dispersions of latex spheres is investigated theoretically on the basis of variational free-energy estimates. We find, in agreement with recent experimental results,[...]![]()
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Fernández Tejero, Carlos ; Lutsko, J. F. ; Colot, J. L. ; Baus, Marc | American Physical Society | 1992-09-15The thermodynamic properties of the Yukawa model for colloidal suspensions are determined theoretically from the Rogers-Young integral equation for the fluid phase and from a recently introduced van der Waals-like theory for the solid phases. Ve[...]![]()
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In analogy with the well-known theory for fluids, a van der Waals theory for solids is proposed. It is shown that, in agreement with recent predictions, the competition between the van der Waals loop of the fluid and the van der Waals loop of th[...]![]()
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López de Haro, Mariano ; Fernández Tejero, Carlos ; Santos, Andrés ; Yuste, Santos B. ; Fiumara, Giacomo ; Saija, Franz | American Institute of Physics | 2015-01-07The problem of demixing in the Asakura-Oosawa colloid-polymer model is considered. The critical constants are computed using truncated virial expansions up to fifth order. While the exact analytical results for the second and third virial coeffi[...]![]()
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The dispersion relations for surface waves on a planar liquid surface are obtained from first principles. The high-frequency elastic, low-frequency hydrodynamic and intermediate viscoelastic regimes are investigated separately. It is shown that [...]![]()
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The phase behavior of disk colloids, embedded in a two-dimensional fluid matrix that undergoes a first-order phase transition, is studied in the complete wetting regime where the thermodynamically metastable fluid phase is stabilized at the surf[...]![]()
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A statistical mechanical treatment of equilibrium elasticity of a uniform fluid phase based on density functional theory is presented. Bulk expressions for the stress tensor and the zero-frequency elastic moduli tensor involving the direct corre[...]