Catalytic Motors for Transport of Colloidal Cargo

Autonomous micro- and nanomotors should, in principle, deliver materials in a site-directed fashion, powering the assembly of dynamic, nonequilibrium superstructures. Here we demonstrate that catalytic Pt−Au nanomotors can transport a prototypical cargo: polystyrene microspheres. In addition, motors...

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Bibliographic Details
Published in:Nano letters 2008-05, Vol.8 (5), p.1271-1276
Main Authors: Sundararajan, Shakuntala, Lammert, Paul E, Zudans, Andrew W, Crespi, Vincent H, Sen, Ayusman
Format: Article
Language:English
Subjects:
Applied sciences
Colloids - chemistry
Computer Simulation
Electromagnetic Fields
Electronics
Exact sciences and technology
Gold - chemistry
Gold - radiation effects
Materials Testing
Micro- and nanoelectromechanical devices (mems/nems)
Models, Chemical
Models, Molecular
Motion
Nanostructures - chemistry
Nanostructures - radiation effects
Nanostructures - ultrastructure
Nanotechnology - instrumentation
Nanotechnology - methods
Particle Size
Platinum - chemistry
Platinum - radiation effects
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:Autonomous micro- and nanomotors should, in principle, deliver materials in a site-directed fashion, powering the assembly of dynamic, nonequilibrium superstructures. Here we demonstrate that catalytic Pt−Au nanomotors can transport a prototypical cargo: polystyrene microspheres. In addition, motors with Ni segments can overcome both Brownian orientational fluctuations and biased rotation of the rod−sphere doublet to enable persistent steerable uniaxial motion in an external magnetic field. Assuming a cargo-independent motive force, the speeds are inversely proportional to the Stokes resistance, which we compute using a completed double-layer boundary integral equation. In addition, we demonstrate motors transporting cargo via chemotaxis toward a H2O2 fuel source.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl072275j