期刊
SOFT MATTER
卷 8, 期 5, 页码 1521-1531出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1sm06576a
关键词
-
类别
资金
- Deutsche Forschungsgemeinschaft [C 3.1]
- US-NSF's Research Triangle MRSEC [DMR-1121107]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1121107] Funding Source: National Science Foundation
- Office Of Internatl Science &Engineering
- Office Of The Director [1065466] Funding Source: National Science Foundation
Based on Discontinuous Molecular Dynamics (DMD) simulations we present a phase diagram of two-dimensional nano-particles with dipole-like short-ranged interactions. Similar to systems with true, long-ranged dipolar interactions the present system undergoes a transition from an isotropic fluid phase into a polymer-like fluid, characterized by an association of most particles into clusters. Further decrease of the temperature leads to a percolated system which, moreover, displays dynamical properties reminiscent of a gel. Specifically, we find a plateau in the mean-squared displacement and a non-gaussian behavior of the self-part of the van Hove correlation function. In the high density region we observe crystallization from the isotropic fluid into a solid phase with hexagonal order. Surprisingly, the crystallization is accompanied by a global parallel ordering of the dipole moments, i.e., a ferroelectric phase. This behavior is in marked contrast to what is found in 2D systems with long-ranged dipolar interactions. Our results allow insights into the design of gel-like or highly ordered structures at interfaces, shells around droplets and bubbles and new-sheet like materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据