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Main Title: | Phase diagram of two-dimensional systems of dipole-like colloids |
Author(s): | Schmidle, Heiko Hall, Carol K. Velev, Orlin D. Klapp, Sabine H. L. |
Type: | Article |
Language Code: | en |
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. |
URI: | http://depositonce.tu-berlin.de/handle/11303/5715 http://dx.doi.org/10.14279/depositonce-5335 |
Issue Date: | 2012 |
Date Available: | 29-Jun-2016 |
DDC Class: | 530 Physik |
Sponsor/Funder: | DFG, GRK 1524, Self-Assembled Soft-Matter Nanostructures at Interfaces |
License: | http://rightsstatements.org/vocab/InC/1.0/ |
Journal Title: | Soft matter |
Publisher: | Royal Society of Chemistry |
Publisher Place: | Cambridge |
Volume: | 8 |
Issue: | 5 |
Publisher DOI: | 10.1039/c1sm06576a |
Page Start: | 1521 |
Page End: | 1531 |
EISSN: | 1744-6848 |
ISSN: | 1744-683X |
Notes: | Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich. This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively. |
Appears in Collections: | Inst. Theoretische Physik » Publications |
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