title: Catalytic motors for transport of colloidal cargo.
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 double-layer boundary integral equation. In addition, we demonstrate motors transporting cargo via chemotaxis toward a H2O2 fuel source.
authors.affiliation: Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Shakuntala
authors.initials: S
authors.lastname: Sundararajan
authors.forename: Paul E
authors.initials: PE
authors.lastname: Lammert
authors.forename: Andrew W
authors.initials: AW
authors.lastname: Zudans
authors.forename: Vincent H
authors.initials: VH
authors.lastname: Crespi
authors.forename: Ayusman
authors.initials: A
authors.lastname: Sen
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D004574:Electromagnetic Fields; D006046:Gold / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular; D009038:Motion; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D003102:Colloids; D010984:Platinum; D006046:Gold