Effect of membrane thermal conductivity on ion current rectification in conical nanochannels under asymmetric temperature

Qiao, Nan; Li, Zhenquan; Zhang, Zhe; Guo, Haitao; Liao, J. Y.; Lü, Wei; Li, Changzheng

doi:10.1016/j.aca.2023.341724

Cited by 6 publications

(1 citation statement)

References 51 publications

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“…Lin et al [ 27 ] numerically simulated nanoparticle detection using bipolar conical nanopores and found that the combination of bipolar conical nanopores and the ICR effect improved the capture frequency for target particles and the measurement accuracy. Several numerical analyses suggested that the ICR behavior of asymmetric nanochannels effectively responded to the solution pH [ 28 ] and heat conduction [ 29 ]. Applications of ion concentration polarization and ICR for micro-nanofluidic systems have been summarized in a review article [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Micro- and Nanofluidic pH Sensors Based on Electrodiffusioosmosis

Takagi,

Kishimoto,

Doi

2024

Micromachines

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Recently, various kinds of micro- and nanofluidic functional devices have been proposed, where a large surface-to-volume ratio often plays an important role in nanoscale ion transport phenomena. Ionic current analysis methods for ions, molecules, nanoparticles, and biological cells have attracted significant attention. In this study, focusing on ionic current rectification (ICR) caused by the separation of cation and anion transport in nanochannels, we successfully induce electrodiffusioosmosis with concentration differences between protons separated by nanochannels. The proton concentration in sample solutions is quantitatively evaluated in the range from pH 1.68 to 10.01 with a slope of 243 mV/pH at a galvanostatic current of 3 nA. Herein, three types of micro- and nanochannels are proposed to improve the stability and measurement accuracy of the current–voltage characteristics, and the ICR effects on pH analysis are evaluated. It is found that a nanochannel filled with polyethylene glycol exhibits increased impedance and an improved ICR ratio. The present principle is expected to be applicable to various types of ions.

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