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Monitoring Protein Adsorption with Solid-state Nanopores

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Regulating Nonlinear Ion Transport through a Solid-State Pore by Partial Surface Coatings.

Iat Wai Leong¹, Makusu Tsutsui¹, Kazumichi Yokota²

¹The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan.

ACS Applied Materials & Interfaces

|January 20, 2023

Summary

This summary is machine-generated.

Researchers developed a new method using dielectric coatings on nanofluidic channels to control ion transport. This allows for precise manipulation of ionic current for blue energy harvesting and iontronic devices.

Keywords:

electroosmotic flow ion transport microfluidics nanopores salt gradient

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Area of Science:

Nanotechnology
Physical Chemistry
Materials Science

Background:

Functional nanofluidic devices are crucial for nanoscale energy harvesting and iontronic applications.
Controlling ion transport at the nanoscale is key to developing advanced iontronic devices.
Understanding surface charge effects on ion transport is vital for device performance.

Purpose of the Study:

To investigate the effect of partial dielectric coatings on nonlinear ionic current in nanofluidic pores.
To explore how different dielectric materials and coating patterns influence ion transport.
To demonstrate the potential for creating resistor, diode, and transistor functionalities in nanofluidic channels.

Main Methods:

Numerical simulations were employed to analyze ion transport dynamics.
Various dielectric materials were tested on inner and outer channel surfaces.
Four distinct patterns of coated and uncoated surfaces were examined.

Main Results:

Partial dielectric coatings were shown to alter nonlinear ionic current through nanofluidic pores.
The pore's behavior could be tuned to act as a resistor, diode, or bipolar junction transistor by controlling surface charge.
Asymmetric ion transport and its relationship with electroosmotic flow were elucidated through simulations.

Conclusions:

Surface charge engineering via dielectric coatings offers a direct method to modify ion transport.
This approach provides a pathway for enhanced ionic current rectification in channel-based devices.
Findings contribute to the fundamental understanding of surface composition's role in nanofluidic ion transport.