NDLI: Phase diagram of two-dimensional systems of dipole-like colloids

Content Provider	Royal Society of Chemistry (RSC)
Author	Klapp, Sabine H. L. Hall, Carol K. Velev, Orlin D. Schmidle, Heiko
Copyright Year	2012
Abstract	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.
Starting Page	1521
Ending Page	1531
Page Count	11
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	8
Issue Number	5
Journal	Soft Matter
DOI	10.1039/c1sm06576a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Isotropy Plateau Ferroelectricity Hove Discontinuous Molecular Dynamics Phase diagram Dipole Correlation function
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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