M. Kasch et F. Forstmann, AN ORIENTATIONAL INSTABILITY AND THE LIQUID-VAPOR INTERFACE OF A DIPOLAR HARD-SPHERE FLUID, The Journal of chemical physics, 99(4), 1993, pp. 3037-3048
Investigating the stability of the dipolar hard sphere fluid by locali
zing the spinodal we found an additional instability for medium and ty
pical vapor densities, an orientational instability with formation of
aligned clusters. For liquid densities we find ordinary vaporization.
Then we calculate the structure of the liquid-vapor interface of a dip
olar hard sphere fluid in the spirit of the weighted density approxima
tion (WDA) using an equation originally derived by Lovett, Mou, and Bu
ff [J. Chem. Phys. 65, 570 (1976)] and Wertheim [J. Chem. Phys. 65, 23
77 (1976)]. The surface tension is evaluated on the same level of appr
oximation.