Journal ArticleDOI
Ionic current rectification in a conical nanofluidic field effect transistor
TLDR
In this article, the field effect on the ionic current rectification (ICR) in the conical nanofluidic FET was comprehensively investigated using a continuum model, composed of Nernst-Planck equations for ionic concentrations, Poisson equation for the electric potential, and Navier-Stokes equations for the flow field.Abstract:
A conical nanofluidic field effect transistor (FET) refers to a conical nanopore embedded with an electrically controllable gate electrode. The surface potential of the nanopore can be effectively regulated by manipulating the gate potential applied to the gate electrode, which in turn controls the ionic current through the nanopore. The field effect on the ionic current rectification (ICR) in the conical nanofluidic FET is comprehensively investigated using a continuum model, composed of Nernst–Planck equations for the ionic concentrations, Poisson equation for the electric potential, and Navier–Stokes equations for the flow field. Under the conditions of a low ionic concentration, a low surface charge density of the nanopore, and a high permittivity of the dielectric nanopore, regulation of ICR by FET is significant. The field effect on the ICR with the gate electrode located in the middle region is opposite to that with the gate electrode located near the tip of the nanopore.read more
Citations
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Journal ArticleDOI
Ion Transport in a pH-Regulated Nanopore
TL;DR: Electrokinetic ion transport in a pH-regulated nanopore, taking into account both multiple ionic species and charge regulation on the nanopore wall, is theoretically investigated for the first time.
Journal ArticleDOI
Field effect control of surface charge property and electroosmotic flow in nanofluidics
TL;DR: In this paper, approximate analytical expressions are derived for the first time to estimate the surface-charge property and electroosmotic flow in charge-regulated nanochannels tuned by the nanofluidic FET and are validated by comparing their predictions to the existing experimental data available from the literature.
Journal ArticleDOI
Ion Concentration Polarization in Polyelectrolyte-Modified Nanopores
TL;DR: In this article, electric field-induced ion transport and the resulting conductance in a polyelectrolyte-modified nanopore were theoretically studied using a continuum-based model, composed of coupled Poisson-Nernst-Planck (PNP) equations for the ionic mass transport, and Stokes and Brinkman equations for hydrodynamic fields in the exterior and interior of the PE layer, respectively.
Journal ArticleDOI
A review of steric interactions of ions: Why some theories succeed and others fail to account for ion size
TL;DR: In this article, a review analyzes what features a theory must have in order to accurately account for steric interactions between ions in the electrical double layers at the device walls and compares them against Monte Carlo simulations to gauge their accuracy.
Journal ArticleDOI
Electrokinetic ion and fluid transport in nanopores functionalized by polyelectrolyte brushes
Li-Hsien Yeh,Li-Hsien Yeh,Mingkan Zhang,Ning Hu,Ning Hu,Sang W. Joo,Shizhi Qian,Shizhi Qian,Jyh-Ping Hsu +8 more
TL;DR: This study theoretically investigated the importance of the bulk salt concentration, the geometries of the nanopore, and both the thickness and the grafting density of the polyelectrolyte brushes on the electrokinetic ion and fluid transport in two types of PE brush functionalized nanopore.
References
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TL;DR: In this paper, the effect of ion-current rectification is observed as asymmetric currentvoltage (I-V) curves, with the current recorded for one voltage polarity higher than the current for the same absolute value of voltage of opposite polarity.
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Journal ArticleDOI
Ion transport in nanofluidic channels
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