Traveling strings of active dipolar colloids Article Swipe

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Xichen Chao , Katherine Skipper , C. Patrick Royall , Silke Henkes , Tanniemola B. Liverpool ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2404.12218

We study an intriguing new type of self-assembled active colloidal polymer system in 3D. It is obtained from a suspension of Janus particles in an electric field that induces parallel dipoles in the particles as well as self-propulsion in the plane perpendicular to the field. At low packing fractions, in experiment, the particles self-assemble into 3D columns that are self-propelled in 2D. Explicit numerical simulations combining dipolar interactions and active self-propulsion find an activity dependent transition to a string phase by increasing dipole strength. We classify the collective dynamics of strings as a function of rotational and translational diffusion. Using an anisotropic version of the Rouse model of polymers with active driving, we analytically compute the strings' collective dynamics and centre of mass motion, which matches simulations and is consistent with experimental data. We also discover long range correlations of the fluctuations along the string contour that grow with the active persistence time, a purely active effect that disappears in the thermal limit.

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Colloid Dipole Colloidal particle Chemical physics Physics Chemistry Physical chemistry Quantum mechanics

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2404.12218
PDF: https://arxiv.org/pdf/2404.12218
OA Status: green
Cited By: 1
Related Works: 10
OpenAlex ID: https://openalex.org/W4394972024

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DOI: https://doi.org/10.48550/arxiv.2404.12218

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Title: Traveling strings of active dipolar colloids

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Type: preprint

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Language: en

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Publication year: 2024

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Publication date: 2024-04-18

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Authors: Xichen Chao, Katherine Skipper, C. Patrick Royall, Silke Henkes, Tanniemola B. Liverpool

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Landing page: https://arxiv.org/abs/2404.12218

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PDF URL: https://arxiv.org/pdf/2404.12218

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Concepts: Colloid, Dipole, Colloidal particle, Chemical physics, Physics, Chemistry, Physical chemistry, Quantum mechanics

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Cited by: 1

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Citations by year (recent): 2024: 1

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Related works (count): 10

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