Highly controllable near-surface swimming of magnetic Janus nanorods: application to payload capture and manipulation
Mair, Lamar O; Evans, Benjamin; Hall, Adam R; Carpenter, Jerome; Shields, Adam; Ford, Kris; Millard, Michael; Superfine, Richard; Mair, Lamar O; Curriculum in Applied Sciences and Engineering, University of North Carolina at Chapel Hill, NC 27599, USA; Evans, Benjamin; Department of Physics, Elon University, Elon, NC 27244, USA; Hall, Adam R; Joint School of Nanoscience and Nanoengineering, University of North Carolina at Greensboro, NC 27401, USA; Carpenter, Jerome; Curriculum in Applied Sciences and Engineering, University of North Carolina at Chapel Hill, NC 27599, USA; Shields, Adam; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, NC 27599, USA; Ford, Kris; Department of Biomedical Engineering, University of North Carolina at Chapel Hill, NC 27599, USA; Millard, Michael; Department of Biomedical Engineering, University of North Carolina at Chapel Hill, NC 27599, USA; Superfine, Richard; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, NC 27599, USA
Журнал:
Journal of Physics D: Applied Physics
Дата:
2011-03-30
Аннотация:
Directed manipulation of nanomaterials has significant implications in the field of nanorobotics, nanobiotechnology, microfluidics and directed assembly. With the goal of highly controllable nanomaterial manipulation in mind, we present a technique for the near-surface manoeuvering of magnetic nanorod swimmers and its application to controlled micromanipulation. We fabricate magnetic Janus nanorods and show that the magnetic rotation of these nanorods near a floor results in predictable translational motion. The nanorod plane of rotation is nearly parallel to the floor, the angle between rod tilt and floor being expressed by θ, where 0° < θ < 20°. Orthogonal magnetic fields control in-plane motion arbitrarily. Our model for translation incorporates symmetry breaking through increased drag at the no-slip surface boundary. Using this method we demonstrate considerable rod steerability. Additionally, we approach, capture, and manipulate a polystyrene microbead as proof of principle. We attach Janus nanorods to the surfaces of cells and utilize these rods to manipulate individual cells, proving the ability to manoeuver payloads with a wide range of sizes.
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