Mean Field Fluid Behavior of the Gaussian Core Model

Details Mean Field Fluid Behavior of the Gaussian Core Model Mean Field Fluid Behavior of the Gaussian Core Model

2000-07-04

arxiv.org/abs/cond-mat/0007062v2

Phys. Rev. E. 62, 7961 (2000)

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 2 columns, ReVTeX epsfig,multicol,amssym, 15 figures; submitted to Phys. Rev. E (change: important reference added)

Scientific paper

10.1103/PhysRevE.62.7961

We show that the Gaussian core model of particles interacting via a penetrable repulsive Gaussian potential, first considered by Stillinger (J. Chem. Phys. 65, 3968 (1976)), behaves like a weakly correlated ``mean field fluid'' over a surprisingly wide density and temperature range. In the bulk the structure of the fluid phase is accurately described by the random phase approximation for the direct correlation function, and by the more sophisticated HNC integral equation. The resulting pressure deviates very little from a simple, mean-field like, quadratic form in the density, while the low density virial expansion turns out to have an extremely small radius of convergence. Density profiles near a hard wall are also very accurately described by the corresponding mean-field free-energy functional. The binary version of the model exhibits a spinodal instability against de-mixing at high densities. Possible implications for semi-dilute polymer solutions are discussed.

Affiliated with

Also associated with

No associations

Rating

Mean Field Fluid Behavior of the Gaussian Core Model 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 Mean Field Fluid Behavior of the Gaussian Core Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mean Field Fluid Behavior of the Gaussian Core Model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-171436