Influence of location junction on ion transfer behavior in conical nanopores with bipolar polyelectrolyte brushes

Alinezhad, Amin; Alinezhad, Alireza

doi:10.1016/j.electacta.2022.140699

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…For asymmetric channels, the EDL overlaps significantly in narrow regions, , resulting in a greater friction that impedes the ion mobility. The charge distribution and geometric structure , of nanochannels have a synergistic effect on the ion transport, and tuning these parameters facilitates the optimal rectification performance. For conical nanochannels, modulating the functionalization time to change the ratio of coatings inside the channel achieves rectification maximization, which indicates the difference in the total current contribution of cations and anions.…”

Section: Introductionmentioning

confidence: 99%

“…18,19 It is worth noting that the size of the channel governs the thickness of the EDL. For asymmetric channels, the EDL overlaps significantly in narrow regions, 9,20 distribution 21 and geometric structure 22,23 of nanochannels have a synergistic effect on the ion transport, and tuning these parameters facilitates the optimal rectification performance.…”

Section: Introductionmentioning

confidence: 99%

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Ionic Current Rectification Induced by Charge Polarity in Janus Graphene Channels

Zhang

2023

J. Phys. Chem. C

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Ionic current rectification (ICR) in nanofluidic diodes is determined by a combination of channel geometry and surface charge, where most of the previous works have focused on charged asymmetric channels. In this work, through a series of molecular dynamics simulations, we find a surprising ICR phenomenon in a Janus graphene channel, whose geometry is symmetric, while the surface charge is asymmetric by tuning the ratio of cationic and anionic surface modification. A key observation is that when the electric field changes from positive to negative direction, the ionic current exhibits a switchable on−off state depending on whether the dipole moment of the channel's inner surface is parallel to the electrical force. Strikingly, the ICR ratio shows a maximum behavior with the increase in cationic modification, attributed to the change in the range of electrostatic repulsion under the negative electric field. Furthermore, for a given modification ratio, with the increase in graphene layer distance, the ICR ratio also displays a maximum behavior because of the reduced range of the electric double layer (EDL). For small layer distance, the EDL overlap leads to a Coulomb blockade effect under the positive electric field, corresponding to a small ionic current. However, the large layer distance reduces the influence of EDL on ion transport owing to the weakened electrostatic interactions, which ultimately leads to the decrease in ICR ratio. Our results shed light on the essential role of charge polarity in ICR performance, which could open a new window for the design of novel nanofluidic diodes based on symmetric Janus channels.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ionic Current Rectification Induced by Charge Polarity in Janus Graphene Channels

Zhang

2023

J. Phys. Chem. C

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“…Polyelectrolyte (PE) layer with a certain thickness is generally used to modify the surface of nanochannels, – achieving the selective transport of ions. It is found that the presence of the PE layer significantly influences the electrokinetic behavior in nanochannel, such as ion current rectification (ICR). – However, the influence of coupled surface and space charges on the energy conversion has not been studied so far.…”

Section: Introductionmentioning

confidence: 99%

Concentration-Gradient Power Generation Coupled with Surface and Space Charges

Liu,

Chen,

Liu

2023

Ind. Eng. Chem. Res.

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Concentration-gradient energy conversion has inspired extensive research interest due to its wide availability in nature. However, less attention has been paid to the coupled effects of surface and space charges. Here, a coupled ion transport model is established to study how the surface and space charges influence the energy conversion in nanochannels. It is found that the coupled surface and space charges enhance the energy conversion performance, and it is promoted further through increasing the density of the polyelectrolyte (PE) layer charged groups and modified thickness. The enhanced charged characteristics due to the coupling effect are the intrinsic mechanism for the improved energy conversion performance. Although the space charge introduces frictional resistance simultaneously, it is insignificant because electroosmosis is weak on concentration-gradient energy conversion. At research scopes, it achieves a maximum output power of 0.6 pW and energy conversion efficiency of 49%, respectively. This work provides an effective tuning strategy on concentration-gradient power generation and useful guidance in the design of fluidic energy device.

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Electroosmotic flow, ionic current rectification, and selectivity of a conical nanopore modified with a pH-regulated polyelectrolyte layer: Influence of functional groups profile

Chuang,

Hsu

2023

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Influence of location junction on ion transfer behavior in conical nanopores with bipolar polyelectrolyte brushes

Cited by 6 publications

References 43 publications

Ionic Current Rectification Induced by Charge Polarity in Janus Graphene Channels

Ionic Current Rectification Induced by Charge Polarity in Janus Graphene Channels

Concentration-Gradient Power Generation Coupled with Surface and Space Charges

Electroosmotic flow, ionic current rectification, and selectivity of a conical nanopore modified with a pH-regulated polyelectrolyte layer: Influence of functional groups profile

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