SHEN, Zaiyi; WÜRGER, Alois; LINTUVUORI, Juho

doi:10.1039/C8SM02352B

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SHEN, Zaiyi
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

WÜRGER, Alois
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

LINTUVUORI, Juho
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Ce document a été publié dans

Soft Matter. 2019, vol. 15, n° 7, p. 1508

Royal Society of Chemistry

Résumé en anglais

Active colloids self-organise to a variety of collective states, ranging from highly motile "molecules" to complex 3D structures. Using large-scale simulations, we show that hydrodynamic interactions, together with a gravity-like aligning field, lead to tunable self-assembly of active colloidal spheres near a surface. The observed structures depend on the hydrodynamic characteristics: particles driven at the front, pullers, form small chiral spinners consisting of two or three particles, whereas those driven at the rear, pushers, assemble to large dynamic aggregates. The rotational motion of the puller spinners, arises from spontaneous breaking of the internal chirality. Our results show that the fluid flow mediates chiral transfer between neighbouring spinners. Finally we show that the chirality of the individual spinners controls the topology of the self-assembly in solution: homochiral samples assemble into a hexagonally symmetric 2D crystal lattice while racemic mixtures show reduced hexatic order with diffusion-like dynamics.< Réduire

Mots clés en anglais

hydrodynamic interactions

self-assembly

active colloids

DOI

http://dx.doi.org/10.1039/C8SM02352B

Project ANR

Effets thermoélectriques à l'échelle nano - ANR-13-IS04-0003

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798