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Title: Tunable self-healing of magnetically propelling colloidal carpets
Author: Massana-Cid, Helena
Meng, Fanlong
Matsunaga, Daiki
Golestanian, Ramin
Tierno, Pietro
Keywords: Col·loides
Propietats magnètiques
Magnetic properties
Issue Date: 4-Jun-2019
Publisher: Nature Publishing Group
Abstract: The process of crystallization is difficult to observe for transported, out-of-equilibrium sys-tems, as the continuous energy injection increases activity and competes with ordering. Inemergingfields such as microfluidics and active matter, the formation of long-range order isoften frustrated by the presence of hydrodynamics. Here we show that a population ofcolloidal rollers assembled by magneticfields into large-scale propelling carpets can formperfect crystalline materials upon suitable balance between magnetism and hydrodynamics.We demonstrate afield-tunable annealing protocol based on a controlled colloidalflow abovethe carpet that enables complete crystallization after a few seconds of propulsion. Thestructural transition from a disordered to a crystalline carpet phase is captured via spatial andtemporal correlation functions. Ourfindings unveil a novel pathway to magnetically annealclusters of propelling particles, bridging driven systems with crystallization and freezing inmaterial science.
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It is part of: Nature Communications, 2019, vol. 10, num. 1, p. 2444
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ISSN: 2041-1723
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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