Volume 80, Number 5, December 2007
Article Number 56002
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
Published online 26 October 2007
EPL, 80 (2007) 56002
DOI: 10.1209/0295-5075/80/56002

Thermodynamic properties and liquid-gas phase diagram of the dipolar hard-sphere fluid

Y. V. Kalyuzhnyi1, I. A. Protsykevytch1 and P. T. Cummings2, 3

1  Institute for Condensed Matter Physics - Svientsitskoho 1, 79011 Lviv, Ukraine
2  Department of Chemical Engineering, Vanderbilt University - Nashville, TN 37235-1604, USA
3  Chemical Sciences Division, Oak Ridge National Laboratory - Oak Ridge, TN 27831-6110, USA

received 21 August 2007; accepted in final form 4 October 2007; published December 2007
published online 26 October 2007

A version of the thermodynamic perturbation theory for associative fluids with central force associative potential is developed. The theory is used to describe thermodynamic properties of the fluid of dipolar hard spheres at intermediate and low temperatures. The accuracy of the theory proposed ranges from quantitative at intermediate temperatures to qualitative at low temperatures. The liquid-gas phase diagram with the critical point located in reasonable agreement with the prediction of a recent computer simulation estimate is calculated.

64.10.+h - General theory of equations of state and phase equilibria.
64.70.Fx - Liquid-vapor transitions.
82.70.Dd - Colloids.

© Europhysics Letters Association 2007