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Issue 24, 2020
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Anisotropic dynamics of a self-assembled colloidal chain in an active bath

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Abstract

Anisotropic macromolecules exposed to non-equilibrium (active) noise are very common in biological systems, and an accurate understanding of their anisotropic dynamics is therefore crucial. Here, we experimentally investigate the dynamics of isolated chains assembled from magnetic microparticles at a liquid–air interface and moving in an active bath consisting of motile E. coli bacteria. We investigate both the internal chain dynamics and the anisotropic center-of-mass dynamics through particle tracking. We find that both the internal and center-of-mass dynamics are greatly enhanced compared to the passive case, i.e., a system without bacteria, and that the center-of-mass diffusion coefficient D features a non-monotonic dependence as a function of the chain length. Furthermore, our results show that the relationship between the components of D parallel and perpendicular with respect to the direction of the applied magnetic field is preserved in the active bath compared to the passive case, with a higher diffusion in the parallel direction, in contrast to previous findings in the literature. We argue that this qualitative difference is due to subtle differences in the experimental geometry and conditions and the relative roles played by long-range hydrodynamic interactions and short-range collisions.

Graphical abstract: Anisotropic dynamics of a self-assembled colloidal chain in an active bath

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Supplementary files

Article information


Submitted
23 Feb 2020
Accepted
20 May 2020
First published
10 Jun 2020

This article is Open Access

Soft Matter, 2020,16, 5609-5614
Article type
Paper

Anisotropic dynamics of a self-assembled colloidal chain in an active bath

M. Shafiei Aporvari, M. Utkur, E. U. Saritas, G. Volpe and J. Stenhammar, Soft Matter, 2020, 16, 5609
DOI: 10.1039/D0SM00318B

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