[en] Magnetocapillary interactions between particles allow to self-assemble floating crystals along liquid interfaces. For a fixed number of particles, different states possessing different symmetrical features, known as metastable states, coexist. In this paper, we demonstrate how to trigger the transition from one state to another, either by rearranging the crystal, or by controlling its growth. First, we show that externally controlled magnetic fields can squeeze the entire crystal to induce structural modifications, that upon relaxation can lead to a modified state. Second, we propose localized laser-induced thermocapillary flows that can be used to guide new particles towards an existing crystal in a desired direction, thus favoring a particular resulting state. The control of the formation of metastable states is a key ingredient to functionalize such assemblies, paving the way to self-assembled microrobots.
Disciplines :
Physics
Author, co-author :
Collard, Ylona ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Piñan Basualdo, Franco N; TIPs, École Polytechnique de Bruxelles, Université Libre de Bruxelle, 1050, Brussels, Belgium. franco.pinan.basualdo@ulb.be ; FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25000, Besançon, France. franco.pinan.basualdo@ulb.be
Bolopion, Aude; FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25000, Besançon, France
Gauthier, Michaël; FEMTO-ST, CNRS, Université Bourgogne Franche-Comté, 25000, Besançon, France
Lambert, Pierre; TIPs, École Polytechnique de Bruxelles, Université Libre de Bruxelle, 1050, Brussels, Belgium
Vandewalle, Nicolas ; Université de Liège - ULiège > Département de physique > Physique statistique
Language :
English
Title :
Controlled transitions between metastable states of 2D magnetocapillary crystals.
F.R.S.-FNRS - Fonds de la Recherche Scientifique BELSPO - Belgian Science Policy Office
Funding text :
This work is financially supported by the University of Liège through the CESAM Research Unit. F.P.B and Y.C. are financially supported by the Grant FNRS PDR T.0129.18. This work is supported by BELSPO (IAP 7/38 MicroMAST) and the EUR EIPHI program (ANR-17-EURE-0002).
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