Condensed Matter Physics, 2007, vol. 10, No. 4(52), p. 553, English

Title: Liquid-gas phase behavior of Stockmayer fluid with high dipolar moment
  Yu.V.Kalyuzhnyi (Institute for Condensed Matter Physics, Svientsitskoho 1, 79011, Lviv, Ukraine) ,
  I.A.Protsykevitch (Institute for Condensed Matter Physics, Svientsitskoho 1, 79011, Lviv, Ukraine) ,
  P.T.Cummings (Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, and Nanomaterials Theory Institute, Center for Nanophase Material Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830)

A multi-density version of the thermodynamic perturbation theory for associative fluids with central force associative potential is developed. The theory is used to describe the liquid-gas phase behavior of Stochmayer fluid with different values of the dipole moment ranging from low to high. Results of the theory are in a reasonable agreement with corresponding computer simulation results in a whole range of the dipole moment values studied. Contrary to previous computer simulation findings our calculations predict the occurence of the liquid-gas phase coexistence for the soft-sphere dipole fluid model.

Key words: Stockmayer fluid, phase diagram, association, dipole moment
PACS: 64.10.+h, 64.70.Fx, 82.70.Dd

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