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Selective Actuation and Tomographic Imaging of Swarming Magnetite Nanoparticles

Abstract : Micro- and nanomotors have seen substantial progress in recent years for biomedical applications. However, three grand challenges remain: (i) high velocities to overcome the blood flow, (ii) spatially selective control to enable complex navigation, and (iii) integration of a medical, tomographic real-time imaging method to acquire feedback information. Here, we report the combination of active magnetic matter and a medical imaging technique, namely magnetic particle imaging (MPI), which addresses these needs. We synthesize ∼200 nm magnetic nanoparticles and observe a macroscopic, collective effect in a homogeneous magnetic field with a rotating field vector. The nanoparticles form a millimeter-sized cloud and reach speeds of 8 mm s–1. This cloud is imaged and selectively steered with an MPI scanner. Our experimental results are supported by a model that highlights the role of the Mason number, the particle’s volume fraction, and the height of the cloud. The successful introduction of a fast swarm of microscopic units and the spatial selectivity of the technique suggest an effective approach to translate the use of micro- and nanobots into a clinical application.
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Submitted on : Wednesday, March 16, 2022 - 3:30:40 PM
Last modification on : Friday, April 1, 2022 - 3:52:12 AM

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Klaas Bente, Anna Bakenecker, Anselm von Gladiss, Felix Bachmann, Andrejs Ce̅bers, et al.. Selective Actuation and Tomographic Imaging of Swarming Magnetite Nanoparticles. ACS Applied Nano Materials, American Chemical Society, 2021, 4 (7), pp.6752-6759. ⟨10.1021/acsanm.1c00768⟩. ⟨cea-03610678⟩

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