SciELO - Scientific Electronic Library Online

 
vol.57 número1Systematic electrical characterization study of a hybrid organic-inorganic semiconductor heterojunction at different illumination conditionsEfecto casimir en anti de Sitter 1 + 1 índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Revista mexicana de física E

versão impressa ISSN 1870-3542

Resumo

HERRERA, J.N.; SALAZAR-GOVEA, A.Y.; CRUZ- VERA, A.  e  GONZALEZ-JIMENEZ, E. Thermodynamic properties of simple multi-Yukawa fluids: a variational approach. Rev. mex. fís. E [online]. 2011, vol.57, n.1, pp. 78-82. ISSN 1870-3542.

The perturbation theory of dense fluids interacting according to an intermolecular potential represented as a linear combinations of m-Yukawa functions, whose reference interaction is the hard-sphere potential, allows setting an equation of state in terms of the ratio λ of the corresponding species molecular sizes. In this work we determine λ by solving numerically the non-linear equation that results from the minimization of the system Helmholtz free energy. The resulting values of λ are density and temperature dependent, and are in quantitative agreement with those from the development of Mansoori and Canfield. The proposed method also provides the compressibility factor of the corresponding Lennard-Jones fluid, represented by the combination of a hard-sphere plus two Yukawa terms, in good agreement with the available values from Monte Carlo simulations.

Palavras-chave : Perturbation theory; characteristic diameters; effective potential.

        · resumo em Espanhol     · texto em Inglês     · pdf em Inglês