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Effect of linear surface-charge non-uniformities on the electrokinetic ionic-current rectification in conical nanopores

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Abstract.
The electrokinetic ionic-current rectification in a conical nanopore with linearly varying surface-charge
distributions is studied theoretically by using a continuum model composed of a coupled system
of the Nernst–Planck equations for the ionic-concentration field and the Poisson equation for the
electric potential in the electrolyte solution. The numerical analysis includes the electrochemistry inside
reservoirs connected to the nanopore, neglected in previous studies, and more precise accounts of the
ionic current are provided. The surface-charge distribution, especially near the tip of the nanopore,
significantly affects the ionic enrichment and depletion, which, in turn, influence the resulting ionic
current and the rectification. It is shown that non-uniform surface-charge distribution can reverse the
direction, or sense, of the rectification. Further insights into the ionic-current rectification are provided
by discussing the intriguing details of the electric potential and ionic-concentration fields, leading to the
rectification. Rationale for future studies on ionic-current rectification, associated with other non-uniform
surface-charge distributions and electroosmotic convection for example, is discussed.

Keywords: Nanofluidics, Nanopore, Electrical double layer, Current rectification, Ion transport

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 329 (2009) 376–383

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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