Catalytic motors for transport of colloidal cargo

Shakuntala Sundararajan, Paul E. Lammert, Andrew W. Zudans, Vincent H. Crespi, Ayusman Sen

Research output: Contribution to journalArticlepeer-review

264 Scopus citations

Abstract

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 -layer boundary integral equation. In addition, we demonstrate motors transporting cargo via chemotaxis toward a H 2O 2 fuel source.

Original languageEnglish (US)
Pages (from-to)1271-1276
Number of pages6
JournalNano letters
Volume8
Issue number5
DOIs
StatePublished - May 1 2008

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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