A perturbation solution to the full Poisson-Nernst-Planck equations yields an asymmetric rectified electric field.
Soft Matter
; 16(30): 7052-7062, 2020 Aug 14.
Article
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| MEDLINE
| ID: mdl-32648566
ABSTRACT
We derive a perturbation solution to the one-dimensional Poisson-Nernst-Planck (PNP) equations between parallel electrodes under oscillatory polarization for arbitrary ionic mobilities and valences. Treating the applied potential as the perturbation parameter, we show that the second-order solution yields a nonzero time-average electric field at large distances from the electrodes, corroborating the recent discovery of Asymmetric Rectified Electric Fields (AREFs) via numerical solution to the full nonlinear PNP equations [Hashemi Amrei et al., Phys. Rev. Lett., 2018, 121, 185504]. Importantly, the first-order solution is analytic, while the second-order AREF is semi-analytic and obtained by numerically solving a single linear ordinary differential equation, obviating the need for full numerical solutions to the PNP equations. We demonstrate that at sufficiently high frequencies and electrode spacings the semi-analytical AREF accurately captures both the complicated shape and the magnitude of the AREF, even at large applied potentials.
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01-internacional
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MEDLINE
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En
Revista:
Soft Matter
Año:
2020
Tipo del documento:
Article
País de afiliación:
Estados Unidos