Condensed Matter Physics, 2012, vol. 15, No. 2, p. 23002:18
DOI:10.5488/CMP.15.23002
arXiv:1207.3258
Title:
Phase equilibria and interfacial properties of twodimensional Yukawa fluids
Author(s):

G.A. MéndezMaldonado
(Facultad de Ciencias FísicoMatemáticas, Benémerita Universidad Autónoma de Puebla, Apartado Postal 1152, 72570, Puebla, México)
,


M. GonzálezMelchor
(Instituto de Física "Luis Rivera Terrazas", Benemérita Universidad Autónoma de Puebla, Apartado Postal J48, 72570, Puebla, México)
,


J. Alejandre
(Departamento de Química, Universidad Autónoma MetropolitanaIztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, 09340, México Distrito Federal, México)

Molecular dynamics simulations of twodimensional soft Yukawa fluids are performed to analyze the effect that the range of interaction has on coexisting densities and line tension. The attractive onecomponent fluid and equimolar mixtures containing positive and negative particles are studied at different temperatures to locate the region where the vaporsolid and vaporliquid phases are stable. When the range of interaction decreases, the critical temperature of the attractive onecomponent systems decreases. However, for the charged mixtures it increases, and this opposite behaviour is understood in terms of the repulsive interactions which are dominant for these systems. The stable phase diagram of twodimensional fluids is defined for smaller values of the decay parameter λ than that of fluids in three dimensions. The twodimensional attractive onecomponent fluid has stable liquidvapor phase diagram for values of λ, in contrast to the threedimensional case, where stability has been observed even for values of λ<15. The same trend is observed in equimolar mixtures of particles carrying opposite charges.
Key words:
phase diagram, Yukawa fluids, interfacial properties
PACS:
05.70.Fh, 64.70.F, 65.20.De, 68.03.Cd
