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Tracer Dynamics in Crowded Active-Particle Suspensions

Reichert, Julian and Voigtmann, Thomas (2021) Tracer Dynamics in Crowded Active-Particle Suspensions. Soft Matter, 17, pp. 10492-10504. Royal Society of Chemistry. doi: 10.1039/D1SM01092A. ISSN 1744-683X.

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We discuss the dynamics of active Brownian particles (ABPs) in crowded environments through the mean-squared displacement (MSD) of active and passive tracer particles in both active and passive host systems. Exact equations for the MSD are derived using a projection operator technique, extending to dense systems the known solution for a single ABP. The interaction of the tracer particle with the host particles gives rise to strong memory effects. Evaluating these approximately in the framework of a recently developed mode-coupling theory for active Brownian particles (ABP-MCT), we discuss the various dynamical regimes that emerge: While self-propelled motion gives rise to super-diffusive MSD, at high densities, this competes with an interaction-induced sub-diffusive regime. The predictions of the theory are shown to be in good agreement with results obtained from an event-driven Brownian dynamics (ED-BD) simulation scheme for the dynamics of two-dimensional active Brownian hard disks.

Item URL in elib:https://elib.dlr.de/147980/
Document Type:Article
Title:Tracer Dynamics in Crowded Active-Particle Suspensions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Voigtmann, ThomasThomas.Voigtmann (at) dlr.deUNSPECIFIED
Journal or Publication Title:Soft Matter
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 10492-10504
Publisher:Royal Society of Chemistry
Keywords:glass transition, active Brownian particles ABP, mode coupling theory, mean squared displacement
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Material Design and New Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Voigtmann, Dr.rer.nat. Thomas
Deposited On:10 Jan 2022 13:22
Last Modified:10 Jan 2022 13:22

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