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Langmuir

Langmuir

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Modulation of Ion Transport in Nanopores Using Polyethylene Glycol

Published:3 December 2024 DOI: 10.1021/acs.langmuir.4c03911
Fei Zheng, HongLuan Li, Jun Yang, Haiyan Wang, Guangle Qin, Dapeng Chen, Jingjie Sha

Abstract

Ion transport in nanopores is crucial for various biological and technological processes, exhibiting unique behaviors compared to bulk solutions. In this study, we systematically explore how polyethylene glycol (PEG) modulates ion transport within a conical nanopore. Our experiments reveal that introducing PEG into the ionic solution induces a reversal in ion current rectification (ICR). We further investigate the impact of PEG concentration, molecular weight, nanopore size, and cation type on ion transport. Additionally, we assess three different configurations of PEG introduction, identifying diffusive flow driven by an asymmetric cation distribution within the nanopore as a dominant transport mechanism. Our results confirm that the interactions between PEG and cations significantly affect ion transport properties. These findings advance our understanding of macromolecular crowding effects on ion transport and suggest potential applications in iontronic devices and biomolecule sensing.

Substances (2)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Potassium chloride 7447-40-7 KCl 1594 suppliers $6.00-$12480.00
Lithium chloride 7447-41-8 LiCl 927 suppliers $5.00-$3350.00

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