Journal
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
Volume 222, Issue 10, Pages 2453-2463Publisher
SPRINGER HEIDELBERG
DOI: 10.1140/epjst/e2013-02029-4
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Funding
- Volkswagen Foundation [I/83902, I/83903]
- German cluster of excellence, Nanosystems Initiative Munich II (NIM II)
- Deutsche Forschungsgemeinschaft [IRTG 1740]
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Using the analytical Fick-Jacobs approximation formalism and extensive Brownian dynamics simulations we study particle transport through two-dimensional periodic channels with triangularly shaped walls. Directed motion is caused by the interplay of constant bias acting along the channel axis and a pressure-driven flow. In particular, we analyze the particle mobility and the effective diffusion coefficient. The mechanisms of entropic rectification is revealed in channels with a broken spatial reflection symmetry in presence of hydrodynamically enforced entropic trapping. Due to the combined action of the forcing and the pressure-driven flow field, efficient rectification with a drastically reduced diffusivity is achieved.
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