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Main Title: Dynamical self-assembly of dipolar active Brownian particles in two dimensions
Author(s): Liao, Guo-Jun
Hall, Carol K.
Klapp, Sabine H. L.
Type: Article
Language Code: en
Abstract: Based on Brownian Dynamics (BD) simulations, we study the dynamical self-assembly of active Brownian particles with dipole–dipole interactions, stemming from a permanent point dipole at the particle center. The propulsion direction of each particle is chosen to be parallel to its dipole moment. We explore a wide range of motilities and dipolar coupling strengths and characterize the corresponding behavior based on several order parameters. At low densities and low motilities, the most important structural phenomenon is the aggregation of the dipolar particles into chains. Upon increasing the particle motility, these chain-like structures break, and the system transforms into a weakly correlated isotropic fluid. At high densities, we observe that the motility-induced phase separation is strongly suppressed by the dipolar coupling. Once the dipolar coupling dominates the thermal energy, the phase separation disappears, and the system rather displays a flocking state, where particles form giant clusters and move collective along one direction. We provide arguments for the emergence of the flocking behavior, which is absent in the passive dipolar system.
Issue Date: 24-Feb-2020
Date Available: 22-Apr-2020
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): dipole–dipole interactions
Brownian particles
dipolar coupling
phase separation
Sponsor/Funder: TU Berlin, Open-Access-Mittel - 2020
DFG, 65143814, GRK 1524: Self-Assembled Soft-Matter Nanostructures at Interfaces
Journal Title: Soft Matter
Publisher: RSC Publishing
Publisher Place: London
Volume: 16
Publisher DOI: 10.1039/C9SM01539F
Page Start: 2208
Page End: 2223
EISSN: 1744-6848
ISSN: 1744-683X
Appears in Collections:FG Computersimulationen und Theorie komplexer Fluide » Publications

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