Neutrophil-inspired propulsion in a combined acoustic and magnetic field

Daniel Ahmed (), Thierry Baasch, Nicolas Blondel, Nino Läubli, Jürg Dual and Bradley J. Nelson ()
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Daniel Ahmed: Institute of Robotics and Intelligent Systems, ETH Zurich
Thierry Baasch: Institute of Mechanical Systems, ETH Zurich
Nicolas Blondel: Institute of Robotics and Intelligent Systems, ETH Zurich
Nino Läubli: Institute of Robotics and Intelligent Systems, ETH Zurich
Jürg Dual: Institute of Mechanical Systems, ETH Zurich
Bradley J. Nelson: Institute of Robotics and Intelligent Systems, ETH Zurich

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Systems capable of precise motion in the vasculature can offer exciting possibilities for applications in targeted therapeutics and non-invasive surgery. So far, the majority of the work analysed propulsion in a two-dimensional setting with limited controllability near boundaries. Here we show bio-inspired rolling motion by introducing superparamagnetic particles in magnetic and acoustic fields, inspired by a neutrophil rolling on a wall. The particles self-assemble due to dipole–dipole interaction in the presence of a rotating magnetic field. The aggregate migrates towards the wall of the channel due to the radiation force of an acoustic field. By combining both fields, we achieved a rolling-type motion along the boundaries. The use of both acoustic and magnetic fields has matured in clinical settings. The combination of both fields is capable of overcoming the limitations encountered by single actuation techniques. We believe our method will have far-reaching implications in targeted therapeutics.

Date: 2017
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DOI: 10.1038/s41467-017-00845-5

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