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Entropic rectification and current inversion in a pulsating channel

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We show the existence of a resonant behavior of the current of Brownian particles confined in a pulsating channel. The interplay between the periodic oscillations of the shape of the channel and a force applied along its axis leads to an increase of the particle current as a function of the diffusion coefficient. A regime of current inversion is also observed for particular values of the oscillation frequency and the applied force. The model proposed is based on the Fick-Jacobs equation in which the entropic barrier and the effective diffusion coefficient depend on time. The phenomenon observed could be used to optimize transport in microfluidic devices or biological channels.

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CARUSELA, M. florencia, RUBÍ CAPACETI, José miguel. Entropic rectification and current inversion in a pulsating channel. _Journal of Chemical Physics_. 2017. Vol. 146, núm. 18, pàgs. 184901-1-184901-7. [consulta: 25 de gener de 2026]. ISSN: 0021-9606. [Disponible a: https://hdl.handle.net/2445/123361]

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