Abstract
A reversal of the particle current in overdamped rocking Brownian motors was predicted more than 20years 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 60nm 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 insitu with 10nm spatial and 250 μs temporal resolution and compare it with theory. At a driving frequency of 250Hz, we observe a current reversal that can be traced to the asymmetric and increasingly static probability density at high frequencies.
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