Effects of cone angle and length of nanopores on the resistive pulse quality

Bakouei, Mostafa; Abdorahimzadeh, Seyedamirhosein; Taghipoor, Mojtaba

doi:10.1039/d0cp04728g

Cited by 9 publications

(13 citation statements)

References 43 publications

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“…Different from the surface charge-induced ICR in conical channels as exemplified by recent simulations ,,,,− and experiments, ,,, the present ion flux asymmetry in the positive and negative directions is mainly due to the geometric restriction to the hydrated ions that leads to the dehydration asymmetry. Figure c displays the rectification ratio of Na + as a function of the channel opening ratio D / d , which exhibits an interesting maximum behavior.…”

Section: Introductioncontrasting

confidence: 55%

“…However, in simulations, there are always several nanometers in length with data collection in nanoseconds. 28,29,31,32 To reduce the statistical uncertainty and collect enough transportation events during the available simulation time of ∼100 ns, larger electric fields of 0.1−1.0 V/nm are widely used.…”

Section: ■ Introductionmentioning

confidence: 99%

“…According to the best of our knowledge, most of the previous experiments ,,, and simulations ,,,,− use nanoporous channels with a certain surface charge density or chemical modification of specific groups on the inner surface of the channels, which have restrictions on certain ions in order to achieve the effect of ICR. However, it is believed that the ICR in a pure geometrical asymmetric channel should be more fundamental as it only considers the dehydration of ions due to confinement.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the channel length in experiments is normally in micrometers, and the corresponding data can be collected in the unit of second, minute, or hour, − where electric fields of 10 –4 –10 –3 V/nm are widely used. However, in simulations, there are always several nanometers in length with data collection in nanoseconds. ,,, To reduce the statistical uncertainty and collect enough transportation events during the available simulation time of ∼100 ns, larger electric fields of 0.1–1.0 V/nm are widely used.…”

Section: Introductionmentioning

confidence: 99%

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Rectification Correlation between Water and Ions through Asymmetric Graphene Channels

Zhao

Zhang

et al. 2021

J. Phys. Chem. B

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Rectification phenomena occurring in asymmetric channels are essential for the design of novel nanofluidic devices such as nanodiodes. Previous studies mostly focus on ion current rectification, while its correlations with water dynamics are rarely explored. In this work, we analyze the transport of water and ions through asymmetric graphene channels under the drive of electric fields using molecular dynamics simulations. A key observation is that the water flux also exists in the rectification phenomenon that follows the ion flux behaviors because of their dynamical coupling relation in electric fields, and both their rectification ratios exhibit maximum behaviors with the change of the channel opening ratio. This is because the ion dehydration is highly asymmetric for small opening ratios. In addition, the cations and anions have distinct rectification ratios that are strongly dependent on the field strength, where the values for anions can even be 1–2 orders larger. This can be attributed to their different hydration shell and dehydration processes in the graphene channel. The translocation time of ions displays a power law relation with the field strength, in agreement with the prediction by Langevin dynamics. Due to the exclude-volume effect, the occupancy of water and ions shows a clear competition and thus changes in an opposite trend with the field strength. Our results demonstrate the rectification correlations between water and ions, and tuning the geometry of graphene channels provides a simple and robust new route to achieve high rectification ratios.

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Section: Introductioncontrasting

confidence: 55%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rectification Correlation between Water and Ions through Asymmetric Graphene Channels

Zhao

Zhang

et al. 2021

J. Phys. Chem. B

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“…The nanopipette tip geometry has been previously shown to affect greatly on resistive pulse signals. 37 Here, we mainly focus on the OCP detection by the CNE.…”

Section: Resultsmentioning

confidence: 99%

Development of multifunctional nanopipettes for controlled intracellular delivery and single-entity detection

et al. 2022

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Effect of capillary action and gravitational force on resistive pulse sensing with nanopipettes

Tognoni,

Adinolfi,

Ballestri

et al. 2024

Journal of Electroanalytical Chemistry

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Effects of cone angle and length of nanopores on the resistive pulse quality

Abstract: Resistive pulse sensing (RPS) has proved to be a viable method for detection and characterization of micro and nano particles. Modern fabrication methods have introduced different nanopore geometries for resistive...

Cited by 9 publications

References 43 publications

Rectification Correlation between Water and Ions through Asymmetric Graphene Channels

Rectification Correlation between Water and Ions through Asymmetric Graphene Channels

Development of multifunctional nanopipettes for controlled intracellular delivery and single-entity detection

Effect of capillary action and gravitational force on resistive pulse sensing with nanopipettes

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