Rescaled density expansions and demixing in hard-sphere binary mixtures

Details Rescaled density expansions and demixing in hard-sphere binary mixtures Rescaled density expansions and demixing in hard-sphere binary mixtures

2004-08-18

arxiv.org/abs/cond-mat/0408402v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 1 figure; to be published in The Journal of Chemical Physics

Scientific paper

10.1063/1.1791611

The demixing transition of a binary fluid mixture of additive hard spheres is analyzed for different size asymmetries by starting from the exact low-density expansion of the pressure. Already within the second virial approximation the fluid separates into two phases of different composition with a lower consolute critical point. By successively incorporating the third, fourth, and fifth virial coefficients, the critical consolute point moves to higher values of the pressure and to lower values of the partial number fraction of the large spheres. When the exact low-density expansion of the pressure is rescaled to higher densities as in the Percus-Yevick theory, by adding more exact virial coefficients a different qualitative movement of the critical consolute point in the phase diagram is found. It is argued that the Percus-Yevick factor appearing in many empirical equations of state for the mixture has a deep influence on the location of the critical consolute point, so that the resulting phase diagram for a prescribed equation has to be taken with caution.

Affiliated with

Also associated with

No associations

Rating

Rescaled density expansions and demixing in hard-sphere binary mixtures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Rescaled density expansions and demixing in hard-sphere binary mixtures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rescaled density expansions and demixing in hard-sphere binary mixtures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-595453