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Link to original content: https://www.ncbi.nlm.nih.gov/pubmed/24345038
Steering acoustically propelled nanowire motors toward cells in a biologically compatible environment using magnetic fields - PubMed Skip to main page content
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. 2013 Dec 31;29(52):16113-8.
doi: 10.1021/la403946j. Epub 2013 Dec 18.

Steering acoustically propelled nanowire motors toward cells in a biologically compatible environment using magnetic fields

Suzanne Ahmed  1 , Wei Wang, Lamar O Mair, Robert D Fraleigh, Sixing Li, Luz Angelica Castro, Mauricio Hoyos, Tony Jun Huang, Thomas E Mallouk
Affiliations

Steering acoustically propelled nanowire motors toward cells in a biologically compatible environment using magnetic fields

Suzanne Ahmed et al. Langmuir. .

Abstract

The recent discovery of fuel-free propulsion of nanomotors using acoustic energy has provided a new avenue for using nanomotors in biocompatible media. Crucial to the application of nanomotors in biosensing and biomedical applications is the ability to remotely control and steer them toward targets of interest, such as specific cells and tissues. We demonstrate in vitro magnetic steering of acoustically powered nanorod motors in a biologically compatible environment. Steering was accomplished by incorporating (40 ± 5) nm thick nickel stripes into the electrochemically grown nanowires. An external magnetic field of 40-45 mT was used to orient the motors, which were acoustically propelled along their long axes. In the absence of a magnetic field, (300 ± 30) nm diameter, (4.3 ± 0.2) μm long nanowires with (40 ± 5) nm thick magnetic stripes exhibit the same self-acoustophoretic behavior, including pattern formation into concentric nanowire circles, aligned spinning chains, and autonomous axial motion, as their non-magnetic counterparts. In a magnetic field, these wires and their paths are oriented as evidenced by their relatively linear trajectories. Coordinated motion of multiple motors and targeting of individual motors toward HeLa cells with micrometer-level precision was demonstrated.

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