Colin Rawlings, Urs Duerig, et al.
IEEE TNANO
A reversal of the particle current in overdamped rocking Brownian motors was predicted more than 20 years ago; however, an experimental verification and a deeper insight into this noise-driven mechanism remained elusive. Here, we investigate the high-frequency behavior of a rocking Brownian motor for 60 nm gold spheres based on electrostatic interaction in a 3D-shaped nanofluidic slit and electro-osmotic forcing of the particles. We measure the particle probability density in situ with 10 nm spatial and 250 μs temporal resolution and compare it with theory. At a driving frequency of 250 Hz, we observe a current reversal that can be traced to the asymmetric and increasingly static probability density at high frequencies.
Colin Rawlings, Urs Duerig, et al.
IEEE TNANO
Martin Spieser, Colin D. Rawlings, et al.
Journal of Applied Physics
Armin W. Knoll, Michal Zientek, et al.
SPIE Advanced Lithography 2014
Elad Koren, Urs Duerig
Physical Review B