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Related Experiment Video

Updated: Dec 15, 2025

Monitoring Protein Adsorption with Solid-state Nanopores

Monitoring Protein Adsorption with Solid-state Nanopores

Published on: December 2, 2011

On Induced Surface Charge in Solid-State Nanopores.

Yao Yao¹, Chenyu Wen¹, Ngan H Pham¹

¹Division of Solid-State Electronics, Department of Electrical Engineering, Uppsala University, SE-751 03 Uppsala, Sweden.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 11, 2020

Summary

This summary is machine-generated.

Induced surface charge in solid-state nanopores significantly alters the electrical double layer (EDL) and electroosmotic flow. This impacts ion transport and ionic current, particularly near the nanopore opening.

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Area of Science:

Nanotechnology
Physical Chemistry
Surface Science

Background:

Solid-state nanopores are crucial for studying ion transport under confinement.
The electrical double layer (EDL) is vital in nanoconfinement, but induced surface charge effects remain unclear.

Purpose of the Study:

To characterize induced surface charge formation and its impact on EDL and electroosmotic flow in nanopores.
To elucidate how these effects modulate ionic current.

Main Methods:

Utilized solid-state truncated-pyramidal nanopores.
Employed analytical modeling and numerical simulations for induced surface charge, EDL, and electroosmotic flow.
Performed experimental validation of ionic current.

Main Results:

Induced surface charge arises from dielectric membrane polarization under an electric field.
This leads to nonuniform surface charge, ion redistribution, and single-polarity ion accumulation.
Observed electroosmotic vortexes near the nanopore opening, influencing transport properties.

Conclusions:

Induced surface charge significantly modifies EDL and electroosmotic flow patterns within nanopores.
These alterations critically affect ionic current and ion transport characteristics.