TITLE:
Dimensionality Effects in Dipolar Fluids: A Density Functional Theory Study
AUTHORS:
Remi Geiger, Sabine H. L. Klapp
KEYWORDS:
Dipole-Dipole Interactions; Dimensionality; Phase Diagram; Density Functional Theory; Long-Range Correlations
JOURNAL NAME:
Journal of Modern Physics,
Vol.4 No.3A,
March
29,
2013
ABSTRACT: Using classical density functional theory (DFT) in a modified mean-field approximation we investigate the fluid phase behavior of quasi-two dimensional dipolar fluids confined to a plane. The particles carry three-dimensional dipole moments and interact via a combination of hard-sphere, van-der-Waals, and dipolar interactions. The DFT predicts complex phase behavior involving first- and second-order isotropic-to-ferroelectric transitions, where the ferroelectric ordering is characterized by global polarization within the plane. We compare this phase behavior, particularly the onset of ferroelectric ordering and the related tri-critical points, with corresponding three-dimensional systems, slab-like systems (with finite extension into the third direction), and true two-dimensional systems with two-dimensional dipole moments.