Nanofluidic Rocking Brownian Motors
Control and transport of nanoscale objects in fluids is challenging because of the unfavorable scaling of most interaction mechanisms to small length scales. We design energy landscapes for nanoparticles by accurately shaping the geometry of a nanofluidic slit and exploiting the electrostatic intera...
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| Veröffentlicht in: | arXiv.org 2018-08 |
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| creator | Skaug, Michael J Schwemmer, Christian Fringes, Stefan Rawlings, Colin D Knoll, Armin W |
| description | Control and transport of nanoscale objects in fluids is challenging because of the unfavorable scaling of most interaction mechanisms to small length scales. We design energy landscapes for nanoparticles by accurately shaping the geometry of a nanofluidic slit and exploiting the electrostatic interaction between like charged particles and walls. Directed transport is performed by combining asymmetric potentials with an oscillating electric field to achieve a rocking Brownian motor. Using 60\,nm diameter gold spheres, we investigate the physics of the motors with high spatio-temporal resolution, enabling a parameter-free comparison with theory. We fabricated a sorting device that separates 60- and 100-nanometer particles in opposing directions within seconds. Modeling suggests that the device separates particles with a radial difference of 1 nanometer. |
| doi_str_mv | 10.48550/arxiv.1808.08147 |
| format | Article |
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| subjects | Charged particles Computational fluid dynamics Electric fields Fluidics Gold Landscape design Motors Nanofluids Nanoparticles Physics - Soft Condensed Matter Temporal resolution |
| title | Nanofluidic Rocking Brownian Motors |
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