Nanometer scale resolution, multi-channel separation of spherical particles in a rocking ratchet with increasing barrier heights
We present a nanoparticle size-separation device based on a nanofluidic rocking Brownian motor. It features a ratchet-shaped electrostatic particle potential with increasing barrier heights along the particle transport direction. The sharp drop of the particle current with barrier height is exploite...
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| creator | Nicollier, Philippe Schwemmer, Christian Ruggeri, Francesca Widmer, Daniel Ma, Xiaoyu Knoll, Armin W |
| description | We present a nanoparticle size-separation device based on a nanofluidic rocking Brownian motor. It features a ratchet-shaped electrostatic particle potential with increasing barrier heights along the particle transport direction. The sharp drop of the particle current with barrier height is exploited to separate a particle suspension into multiple sub-populations. By solving the Fokker--Planck equation, we show that the physics of the separation mechanism is governed by the energy landscape under forward tilt of the ratchet. For a given device geometry and sorting duration, the applied force is thus the only tunable parameter to increase the separation resolution. For the experimental conditions of 3.5 V applied voltage and 20 s sorting, we predict a separation resolution of \(\sim 2\) nm, supported by experimental data for separating spherical gold particles of nominal 80 and 100 nm diameters. |
| doi_str_mv | 10.48550/arxiv.2007.04179 |
| format | Article |
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| subjects | Fluidics Fokker-Planck equation Nanofluids Nanoparticles Physics - Mesoscale and Nanoscale Physics Physics - Soft Condensed Matter Physics - Statistical Mechanics Separation |
| title | Nanometer scale resolution, multi-channel separation of spherical particles in a rocking ratchet with increasing barrier heights |
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