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  Tunable self-healing of magnetically propelling colloidal carpets

Massana-Cid, H., Meng, F., Matsunaga, D., Golestanian, R., & Tierno, P. (2019). Tunable self-healing of magnetically propelling colloidal carpets. Nature Communications, 10(1): 2444. doi:10.1038/s41467-019-10255-4.

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 Creators:
Massana-Cid, H., Author
Meng, Fanlong1, Author           
Matsunaga, D., Author
Golestanian, Ramin1, Author                 
Tierno, P., Author
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1Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2570692              

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 Abstract: The process of crystallization is difficult to observe for transported, out-of-equilibrium systems, as the continuous energy injection increases activity and competes with ordering. In emerging fields such as microfluidics and active matter, the formation of long-range order is often frustrated by the presence of hydrodynamics. Here we show that a population of colloidal rollers assembled by magnetic fields into large-scale propelling carpets can form perfect crystalline materials upon suitable balance between magnetism and hydrodynamics. We demonstrate a field-tunable annealing protocol based on a controlled colloidal flow above the carpet that enables complete crystallization after a few seconds of propulsion. The structural transition from a disordered to a crystalline carpet phase is captured via spatial and temporal correlation functions. Our findings unveil a novel pathway to magnetically anneal clusters of propelling particles, bridging driven systems with crystallization and freezing in material science.

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 Dates: 2019-06-04
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41467-019-10255-4
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Title: Nature Communications
Source Genre: Journal
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Pages: 8 Volume / Issue: 10 (1) Sequence Number: 2444 Start / End Page: - Identifier: -