Anisotropic dynamics of a self-assembled colloidal chain in an active bath
(2020) In Soft Matter 16(24). p.5609-5614- 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... (More)
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.
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- author
- Shafiei Aporvari, Mehdi ; Utkur, Mustafa ; Saritas, Emine Ulku ; Volpe, Giovanni and Stenhammar, Joakim LU
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Soft Matter
- volume
- 16
- issue
- 24
- pages
- 6 pages
- publisher
- Royal Society of Chemistry
- external identifiers
-
- pmid:32519706
- scopus:85087110696
- ISSN
- 1744-6848
- DOI
- 10.1039/d0sm00318b
- language
- English
- LU publication?
- yes
- id
- 91c149c1-18d0-4d6a-b41f-a096bf65ae14
- date added to LUP
- 2020-07-07 12:21:55
- date last changed
- 2024-10-03 04:42:53
@article{91c149c1-18d0-4d6a-b41f-a096bf65ae14,
abstract = {{<p>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.</p>}},
author = {{Shafiei Aporvari, Mehdi and Utkur, Mustafa and Saritas, Emine Ulku and Volpe, Giovanni and Stenhammar, Joakim}},
issn = {{1744-6848}},
language = {{eng}},
number = {{24}},
pages = {{5609--5614}},
publisher = {{Royal Society of Chemistry}},
series = {{Soft Matter}},
title = {{Anisotropic dynamics of a self-assembled colloidal chain in an active bath}},
url = {{http://dx.doi.org/10.1039/d0sm00318b}},
doi = {{10.1039/d0sm00318b}},
volume = {{16}},
year = {{2020}},
}