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000912060 0247_ $$2doi$$a10.21203/rs.3.rs-1505456/v1
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000912060 037__ $$aFZJ-2022-05287
000912060 041__ $$aEnglish
000912060 1001_ $$0P:(DE-HGF)0$$aZhang, Zhiyuan$$b0
000912060 245__ $$aRolling Microswarms along Acoustic Virtual Walls
000912060 260__ $$c2022
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000912060 520__ $$aRolling is a ubiquitous mode of transport utilized by both living organisms and engineeredsystems. Rolling, on the microscale, has become particularly interesting for the manipulationof microswarms, since enacting such motion does not require special prefabrication techniques.However, rolling motion has to date been restricted by the need for a physical boundary to breakthe spatial homogeneity of surrounding mediums, which limits its prospects for microswarmnavigation and cargo delivery to locations with no boundaries. Here, in the absence of realphysical boundaries, we show that chain-shaped microswarms can undergo rolling motion alongvirtual walls in the aqueous medium, impelled by a combination of magnetic and acousticfields. A rotational magnetic field causes individual particles to self-assemble and rotate, whilethe pressure nodes generated by an acoustic standing wave field serve as virtual walls. Theacoustic radiation force pushes the rotating microswarms towards a virtual wall and providesthe reaction force needed to break their fore-aft motion symmetry and induce rolling. Wedevelop an experiment-supported theoretical model to quantify the net displacement generatedby rolling. Finally, we demonstrate that rolling can be achieved along arbitrary trajectoriesby dynamically switching the orientation of the virtual walls and the rotational directions ofthe magnetic field. Consequently, the concept of reconfigurable virtual walls developed hereovercomes the fundamental limitation of a physical boundary being required for universalrolling movements.
000912060 536__ $$0G:(DE-HGF)POF4-1215$$a1215 - Simulations, Theory, Optics, and Analytics (STOA) (POF4-121)$$cPOF4-121$$fPOF IV$$x0
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000912060 7001_ $$0P:(DE-Juel1)169463$$aSukhov, Alexander$$b1
000912060 7001_ $$0P:(DE-Juel1)167472$$aHarting, Jens$$b2$$eCorresponding author
000912060 7001_ $$0P:(DE-Juel1)185890$$aMalgaretti, Paolo$$b3
000912060 7001_ $$0P:(DE-HGF)0$$aAhmed, Daniel$$b4
000912060 773__ $$a10.21203/rs.3.rs-1505456/v1$$p7347$$tnature communications$$v13$$y2022
000912060 8564_ $$uhttps://www.nature.com/articles/s41467-022-35078-8
000912060 8564_ $$uhttps://juser.fz-juelich.de/record/912060/files/Rolling%20Microswarms%20along%20Acoustic%20Virtual%20Walls.pdf$$yOpenAccess
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000912060 9141_ $$y2022
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