Dimensionality Effects in Dipolar Fluids: A Density Functional Theory Study

• 作者: Remi Geiger Sabine H. L. Klapp
• 来源期刊: 现代物理(英文)
• 学科: 化学
• 关键词: Dipole-Dipole INTERACTIONS Dimensionality Phase DIAGRAM Density Functional Theory LONG-RANGE CORRELATIONS
• 年，卷（期）: xdwlyw_2013,（3）
• 页码范围: 401-408
• 页数: 8页
• 分类号: O6

摘要

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.