Oscillatory active microrheology of active suspensions

Abstract Using the method of Brownian dynamics, we investigate the dynamic properties of a 2d suspension of active disks at high Péclet numbers using active microrheology. In our simulations the tracer particle is driven either by a constant or an oscillatory external force. In the first case, we fi...

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Autores principales:	Miloš Knežević, Luisa E. Avilés Podgurski, Holger Stark
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/84c2be73fa2546f58399491e52ac018d
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spelling	oai:doaj.org-article:84c2be73fa2546f58399491e52ac018d2021-11-28T12:16:30ZOscillatory active microrheology of active suspensions10.1038/s41598-021-02103-72045-2322https://doaj.org/article/84c2be73fa2546f58399491e52ac018d2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02103-7https://doaj.org/toc/2045-2322Abstract Using the method of Brownian dynamics, we investigate the dynamic properties of a 2d suspension of active disks at high Péclet numbers using active microrheology. In our simulations the tracer particle is driven either by a constant or an oscillatory external force. In the first case, we find that the mobility of the tracer initially appreciably decreases with the external force and then becomes approximately constant for larger forces. For an oscillatory driving force we find that the dynamic mobility shows a quite complex behavior—it displays a highly nonlinear behavior on both the amplitude and frequency of the driving force. In the range of forces studied, we do not observe a linear regime. This result is important because it reveals that a phenomenological description of tracer motion in active media in terms of a simple linear stochastic equation even with a memory-mobility kernel is not appropriate, in the general case.Miloš KneževićLuisa E. Avilés PodgurskiHolger StarkNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Miloš Knežević Luisa E. Avilés Podgurski Holger Stark Oscillatory active microrheology of active suspensions
description	Abstract Using the method of Brownian dynamics, we investigate the dynamic properties of a 2d suspension of active disks at high Péclet numbers using active microrheology. In our simulations the tracer particle is driven either by a constant or an oscillatory external force. In the first case, we find that the mobility of the tracer initially appreciably decreases with the external force and then becomes approximately constant for larger forces. For an oscillatory driving force we find that the dynamic mobility shows a quite complex behavior—it displays a highly nonlinear behavior on both the amplitude and frequency of the driving force. In the range of forces studied, we do not observe a linear regime. This result is important because it reveals that a phenomenological description of tracer motion in active media in terms of a simple linear stochastic equation even with a memory-mobility kernel is not appropriate, in the general case.
format	article
author	Miloš Knežević Luisa E. Avilés Podgurski Holger Stark
author_facet	Miloš Knežević Luisa E. Avilés Podgurski Holger Stark
author_sort	Miloš Knežević
title	Oscillatory active microrheology of active suspensions
title_short	Oscillatory active microrheology of active suspensions
title_full	Oscillatory active microrheology of active suspensions
title_fullStr	Oscillatory active microrheology of active suspensions
title_full_unstemmed	Oscillatory active microrheology of active suspensions
title_sort	oscillatory active microrheology of active suspensions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/84c2be73fa2546f58399491e52ac018d
work_keys_str_mv	AT milosknezevic oscillatoryactivemicrorheologyofactivesuspensions AT luisaeavilespodgurski oscillatoryactivemicrorheologyofactivesuspensions AT holgerstark oscillatoryactivemicrorheologyofactivesuspensions
_version_	1718408086765436928

Oscillatory active microrheology of active suspensions

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