The triathlon of magnetic actuation: rolling, propelling, swimming with a single magnetic material

Scientific Reports
Peter J Vach, Damien Faivre

Abstract

Magnetic actuation of microscopic devices in a liquid environment has been achieved in various ways, which can be grouped into rolling, propelling and swimming. Previous actuators were designed with a focus on one particular type of magnetic actuation. We have shown earlier that efficient magnetic propellers can be selected from randomly shaped magnetic nanostructures synthesized in solution. Here we show that these synthesized nanostructures can be used for all three types of magnetic actuation. Whereas it might not be surprising that single structures can roll in addition to propelling, swimming is unexpectedly also observed using the same material. In this case, however, the magnetically guided self-assembly of several individual particles into chain-like structures is necessary to obtain swimmers, since individual rigid nanostructures cannot swim. Interestingly, the direction of the swimming motion is not necessarily parallel to the long axis of the chain-like assembly, a finding that had been theoretically expected but experimentally not observed so far. Our findings show that the range of structures that can be effectively actuated by external magnetic fields is much broader than assumed until now. This could open up new ...Continue Reading

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Citations

May 10, 2017·Lab on a Chip·Hakan CeylanMetin Sitti
Feb 15, 2018·Advanced Materials·Xiang-Zhong ChenSalvador Pané
Jun 2, 2018·Small·Klaas BenteDamien Faivre
Aug 11, 2015·Soft Matter·Rolf E Isele-HolderGerhard Gompper
Apr 27, 2018·Nature Communications·José García-TorresPietro Tierno
Oct 21, 2016·Soft Matter·Rolf E Isele-HolderGerhard Gompper
Jun 18, 2017·Physical Review. E·Joshua M DempsterMonica Olvera de la Cruz
Feb 15, 2017·Science Robotics·Jürgen RahmerBernhard Gleich
Jan 26, 2021·Royal Society Open Science·Jinyou Yang
Apr 1, 2021·Chemical Reviews·Huaijuan ZhouMartin Pumera

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