Memory-induced alignment of colloidal dumbbells

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Scientific Reports. Springer. 2023, 13, 17409. eISSN 2045-2322. Available under: doi: 10.1038/s41598-023-44547-z
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When a colloidal probe is forced through a viscoelastic fluid which is characterized by a long stress-relaxation time, the fluid is excited out of equilibrium. This is leading to a number of interesting effects including a non-trivial recoil of the probe when the driving force is removed. Here, we experimentally and theoretically investigate the transient recoil dynamics of non-spherical particles, i.e., colloidal dumbbells. In addition to a translational recoil of the dumbbells, we also find a pronounced angular reorientation which results from the relaxation of the surrounding fluid. Our findings are in good agreement with a Langevin description based on the symmetries of a director (dumbbell) as well as a microscopic bath-rod model. Remarkably, we find an instability with amplified fluctuations when the dumbbell is oriented perpendicular to the direction of driving. Our results demonstrate the complex behavior of non-spherical objects within a relaxing environment which are of immediate interest for the motion of externally but also self-driven asymmetric objects in viscoelastic fluids.

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ISO 690KRISHNA KUMAR, Karthika, Juliana CASPERS, Félix GINOT, Matthias KRÜGER, Clemens BECHINGER, 2023. Memory-induced alignment of colloidal dumbbells. In: Scientific Reports. Springer. 2023, 13, 17409. eISSN 2045-2322. Available under: doi: 10.1038/s41598-023-44547-z
BibTex
@article{KrishnaKumar2023Memor-68755,
  year={2023},
  doi={10.1038/s41598-023-44547-z},
  title={Memory-induced alignment of colloidal dumbbells},
  volume={13},
  journal={Scientific Reports},
  author={Krishna Kumar, Karthika and Caspers, Juliana and Ginot, Félix and Krüger, Matthias and Bechinger, Clemens},
  note={Article Number: 17409}
}
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