Voltage gated inter-cation selective ion channels from graphene nanopores

Cantley, Lauren; Swett, Jacob L.; Lloyd, D.; Cullen, David A.; Zhou, Ke; Bedworth, Peter V.; Heise, S.; Rondinone, Adam J.; Xu, Zhiping; Sinton, S. W.; Bunch, J. Scott

doi:10.1039/c8nr10360g

Cited by 41 publications

(39 citation statements)

References 35 publications

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“…The selectivity we observe for KCl is broadly consistent with other observations in literature. 8,13,33 From Figure 2a, it can seen that by using HfCl 4 , as opposed to KCl, the system exhibits increased selective ion flux at lower cis concentrations. This leads to an increase by an order of magnitude in ion selectivity compared with KCl, consistent with the fits shown here.…”

Section: Acs Nanomentioning

confidence: 99%

Tunable Anion-Selective Transport through Monolayer Graphene and Hexagonal Boron Nitride

et al. 2019

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Membranes that selectively filter for both anions and cations are central to technological applications from clean energy generation to desalination devices. 2D materials have immense potential as these ion-selective membranes due to their thinness, mechanical strength, and tunable surface chemistry; however, currently, only cation-selective membranes have been reported.Here we demonstrate the controllable cation and anion selectivity of both monolayer graphene and hexagonal boron nitride. In particular, we measure the ionic current through membranes grown by chemical vapor deposition containing well-known defects inherent to scalably produced and wet-transferred 2D materials. We observe a striking change from cation selectivity with monovalent ions to anion selectivity by controlling the concentration of multivalent ions and inducing charge inversion on the 2D membrane. Furthermore, we find good agreement between our experimental data and theoretical predictions from the Goldman− Hodgkin−Katz equation and use this model to extract selectivity ratios. These tunable selective membranes conduct up to 500 anions for each cation and thus show potential for osmotic power generation.

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Section: Acs Nanomentioning

confidence: 99%

Tunable Anion-Selective Transport through Monolayer Graphene and Hexagonal Boron Nitride

et al. 2019

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“…One of the most commonly performed experiments to understand ion transport involves measuring the current (I) of ions under an applied electric potential (V ), and determining the conductance (G) of the nanopore using these I-V curves using the relationship I = GV . Molecular dynamics and continuum Poisson-Nernst-Planck (PNP) simulations have been used to explain the experimental results [12][13][14][15][16]. Most of these studies focus on the linear portion of the I-V curve, where the conductance is constant, even though many experimental I-V curves across different systems (over * These authors contributed equally to this work.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes

et al. 2021

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Ultrathin membranes with nanoporous conduits show promise for ionic separations and desalination applications, but the mechanisms underlying the nonlinear ionic transport observed in these systems are not well understood. Here, we demonstrate how induced charge at membrane interfaces can lead to nonlinear ionic transport and voltage-dependent conductance through such channels. The application of an electric field on a polarizable membrane leads to induced charges at the membrane interfaces. The induced charges in turn are screened by diffuse charges in the electrolyte, which are acted upon by the electric field. For extremely thin membranes, the induced charge effect can be significant even for moderate applied voltages commonly used in experiments. We apply a continuum Poisson-Nernst-Planck model to characterize the current-voltage behavior of ultrathin membranes over a wide parameter space. The predictions of the model are compared to recent experiments on graphene and MoS 2 membranes in an electric field. We expect the role of induced charge to be especially pronounced in the limit of atomically thin membranes.

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“…[42] In terms of specific ionic permeability Li + selective membranes for extraction of lithium ions from seawater (where the challenge is to separate Li + from Na + ) have been investigated. [43] Also large pore graphene systems have been investigated where 20-fold selectivity for K + over divalent ions in 50 nm apertures [44] and 100-fold selectivity for K + over Clin 20 nm apertures [45] have been demonstrated.…”

Section: Selectivity Of Functionalized Aperturesmentioning

confidence: 99%

Comments on Ion Selectivity at the Crossroad between Biology and Biomimetics

Hélix‐Nielsen

2021

Adv Materials Technologies

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with specific ion selectivity (e.g., between Na + , K + , Mg 2+ , and Cl -). In the following I will briefly review some aspects of water and ion transport in confined structures with a particular perspective on the transport properties of planar aperture-type engineered carbon-based structures and their biological counterparts Ion-Selective MembranesEfficient ion-selective membranes have potential in a number of technological applications. These include electrodialysis for water desalination and salt pre-concentration; electrolysis for chlorine-alkaline production; and diffusion dialysis for acid and base recovery from wastewater. [3] New developments also include continuous electro-deionization for production of ultrapure water; conversion of chemical to

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Voltage gated inter-cation selective ion channels from graphene nanopores

Abstract: The role of nanobubbles in selectively controlled ionic transport across fabricated nanoporous graphene membranes is elucidated.

Cited by 41 publications

References 35 publications

Tunable Anion-Selective Transport through Monolayer Graphene and Hexagonal Boron Nitride

Tunable Anion-Selective Transport through Monolayer Graphene and Hexagonal Boron Nitride

Nonlinear ion transport mediated by induced charge in ultrathin nanoporous membranes

Comments on Ion Selectivity at the Crossroad between Biology and Biomimetics

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