Understanding enhanced rotational dynamics of active probes in rod suspensions

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2022
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Bos, Meike F.
Abaurrea-Velasco, Clara
de Graaf, Joost
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European Union (EU): 693683
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Suspensions with Controlled Interaction Rules ASCIR
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Soft Matter. Royal Society of Chemistry (RSC). 2022, 18(33), pp. 6246-6253. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/d2sm00583b
Zusammenfassung

Active Brownian particles (APs) have recently been shown to exhibit enhanced rotational diffusion (ERD) in complex fluids. Here, we experimentally observe ERD and numerically corroborate its microscopic origin for a quasi-two-dimensional suspension of colloidal rods. At high density, the rods form small rafts, wherein they perform small-amplitude, high-frequency longitudinal displacements. Activity couples AP-rod contacts to reorientation, with the variance therein leading to ERD. This is captured by a local, rather than a global relaxation time, as used in previous phenomenological modeling. Our result should prove relevant to the microrheological characterization of complex fluids and furthering our understanding of the dynamics of microorganisms in such media.

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ISO 690NARINDER, Narinder, Meike F. BOS, Clara ABAURREA-VELASCO, Joost DE GRAAF, Clemens BECHINGER, 2022. Understanding enhanced rotational dynamics of active probes in rod suspensions. In: Soft Matter. Royal Society of Chemistry (RSC). 2022, 18(33), pp. 6246-6253. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/d2sm00583b
BibTex
@article{Narinder2022-08-24Under-58435,
  year={2022},
  doi={10.1039/d2sm00583b},
  title={Understanding enhanced rotational dynamics of active probes in rod suspensions},
  number={33},
  volume={18},
  issn={1744-683X},
  journal={Soft Matter},
  pages={6246--6253},
  author={Narinder, Narinder and Bos, Meike F. and Abaurrea-Velasco, Clara and de Graaf, Joost and Bechinger, Clemens}
}
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