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arxiv: 2605.18531 · v1 · pith:5LRUAGKEnew · submitted 2026-05-18 · ⚛️ physics.chem-ph

Enhanced Ionic Conductivity of confined Ionic-Liquid in Angstrom-scale 2D channels

Jing Yang , Raj Kumar Gogoi , Chen Ming , Louis A. Maduro , Abdulghani Ismail , Hiran Jyothilal , Kalluvadi Veetil Saurav , Rongrong Qi
show 5 more authors
Ravalika Sajja Ashok Keerthi Robert A. W. Dryfe Alexei A Kornyshev Boya Radha
This is my paper

Pith reviewed 2026-05-20 08:03 UTC · model grok-4.3

classification ⚛️ physics.chem-ph
keywords ionic liquidsnanoconfinementionic conductivity2D slit channelsangstrom-scaleion transportco-solventsvan der Waals assembly
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The pith

Ionic liquids in 1.02 nm 2D slits conduct over 30 times better than bulk by breaking ion pairs.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper examines ion transport when an ionic liquid is squeezed into precisely controlled angstrom-scale slits between stacked 2D layers. Conductivity varies non-monotonically with slit height, rising to a maximum of 26.7 S/m at 1.02 nm—more than thirty times the bulk value—before falling again under tighter squeeze. The gain occurs because the right amount of confinement rearranges the ions so that pairs and clusters split, freeing more individual ions to carry charge. Adding a co-solvent such as acetonitrile raises conductivity further to roughly 145 S/m, showing that both geometry and solvent properties can be tuned together. This establishes a model system for understanding and optimizing ionic motion at molecular scales.

Core claim

By fabricating slit-shaped 2D channels of tunable height h via van der Waals assembly and filling them with [EMIM]+[TFSI]-, the work shows that ionic conductivity depends non-monotonically on confinement. Conductivity reaches a maximum of 26.7 S/m at h = 1.02 nm, exceeding the bulk value by a factor greater than 30. The increase is traced to structural rearrangements of ionic layers that promote breakup of ion pairs and larger clusters, raising the number of free ions. At still smaller heights around 0.68 nm steric hindrance lowers conductivity below bulk. Introduction of co-solvents with high dielectric constant and low viscosity, such as acetonitrile, further increases conductivity to ~145

What carries the argument

Tunable angstrom-scale 2D slit channels of height h that force specific rearrangements of ionic layers and control the breakup of ion pairs versus clusters.

If this is right

  • Optimal slit height can be chosen to maximize free-ion population without reaching steric blockage.
  • Co-solvents that combine high dielectric constant with low viscosity amplify the confinement benefit.
  • Van der Waals assembly of 2D layers provides a platform for systematic tuning of ion transport at the molecular scale.
  • Stronger-than-optimal confinement reduces conductivity through physical crowding of ions.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Electrolyte designs for batteries or supercapacitors could incorporate similar nanoscale slits to raise conductivity without altering the base ionic liquid.
  • The non-monotonic response may appear in other ionic liquids or aqueous electrolytes once channel height is controlled at the angstrom level.
  • Molecular-dynamics models calibrated on this system could predict best confinement sizes for new solvent mixtures.

Load-bearing premise

The measured conductivity changes with channel height arise from ion-pair breakup and layer rearrangements inside the liquid rather than from wall interactions, impurities, or uncertainty in the exact height of the fabricated slits.

What would settle it

Spectroscopic or simulation data showing no net increase in free ions at the 1.02 nm height while conductivity still peaks would falsify the structural-rearrangement mechanism.

Figures

Figures reproduced from arXiv: 2605.18531 by Abdulghani Ismail, Alexei A Kornyshev, Ashok Keerthi, Boya Radha, Chen Ming, Hiran Jyothilal, Jing Yang, Kalluvadi Veetil Saurav, Louis A. Maduro, Raj Kumar Gogoi, Ravalika Sajja, Robert A. W. Dryfe, Rongrong Qi.

Figure 1
Figure 1. Figure 1: Confinement effect on [EMIM]+ [TFSI]- conductivity (σ). (A) Schematic of the slit-shaped 2D channels on top of a micro-hole. Inset shows the cross-section view of a 2D channel. (B) Microscopic image showing the top-view of slit-shaped 2D channels device, where the spacers and 2D channels are sandwiched between the top and bottom layers. (C) Molecular structure and effective size of [EMIM]+ and [TFSI]- ions… view at source ↗
Figure 2
Figure 2. Figure 2: Molecular dynamics (MD) simulations. (A) Schematics of MD simulation system setup. (B) h dependent σ enhancement of [EMIM]+ [TFSI]- estimated based on Green-Kubo equation, relative to the σbulk. (C) Ion number distribution along the h of the channels. X = 0 represents the central plane between the channels’ walls and the grey shaded areas, which represent the individual walls. Schematic of h effect on the … view at source ↗
Figure 4
Figure 4. Figure 4: Effect of acetonitrile on 𝝈[𝐄𝐌𝐈𝐌] +[𝐓𝐅𝐒𝐈] −. (A) Concentration C dependent I-Vcurves of a h = 10.2 Å slit￾shape 2D channels device (channels dimensions: l = 9.35 µm, w = 145 nm and N = 208). Comparison of the 𝜎[EMIM] +[TFSI] − in ACN (B) of h = 10.2 Å slit-shaped 2D channels and a micro-hole, and (C) of slit-shape 2D channels of various h with 𝐶[EMIM] +[TFSI] − = 50 mM, 1.5 M and 2.94 M in ACN as electroly… view at source ↗
Figure 5
Figure 5. Figure 5: Effect of solvent on 𝝈[𝐄𝐌𝐈𝐌] +[𝐓𝐅𝐒𝐈] −. Concentration dependent 𝜎[EMIM] +[TFSI] − of h = 10.2 Å slit-shaped 2D channels and a micro-hole with different solvents: (A) dimethyl carbonate (DMC) and (B) diethyl carbonate (DEC). (C) h-dependent σ of slit-shaped 2D channels for 1.5 M [EMIM]+ [TFSI]- in ACN, DMC and DEC as solvents. The dotted lines in (B) and (C) are guides to the eye. To understand the solvent-… view at source ↗
read the original abstract

Understanding ion-transport under molecular confinement is essential for developing next-generation energy technologies, where ionic motion often occurs within nanoscale or angstrom-scale channels. In this study, we use the model system of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([EMIM]+[TFSI]-) confined within angstrom-scale slit-shaped 2D channels fabricated via van der Waals assembly to exemplify a broader class of confined ionic liquids.This system provides a well-defined platform to unravel generic features of ion transport under extreme confinement. By systematically varying the channel height h, we demonstrate a non-monotonic conductivity dependence on confinement, with a maximum 26.7 S/m at confining height, 1.02 nm, over 30 times of the bulk value for these ionic liquids. The variation of conductivity with confinement arises from structural rearrangements of ionic layers in the slit channel. Enhanced values of conductivity occur under confinements that promote the breakup of ion pairs and larger clusters, thereby increasing the number of free ions. Stronger confinement (h, 0.68 nm) also leads to steric hindrance, lowering conductivity below bulk values. Furthermore, introducing co-solvents with a higher dielectric constant and lower viscosity, such as acetonitrile (ACN), amplifies conductivity to ~145 S/m. Comparative studies using ACN, dimethyl carbonate and diethyl carbonate highlight that both large dielectric constant and low viscosity critically govern ion transport under confinement, as also supported by molecular dynamics simulations. Overall, this work establishes confined [EMIM]+[TFSI]- as a representative system for probing mechanisms of nano- and angstrom-scale ion transport, demonstrating how nanoconfinement and the solvent environment can be systematically tuned to manipulate ionic conductivity at the molecular level.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 0 minor

Summary. The manuscript investigates the ionic conductivity of the ionic liquid [EMIM]+[TFSI]- confined in angstrom-scale 2D slit channels fabricated via van der Waals assembly. By varying the channel height h, it reports a non-monotonic dependence of conductivity on confinement, achieving a maximum of 26.7 S/m at h = 1.02 nm, which is over 30 times the bulk value. This is attributed to structural rearrangements promoting the breakup of ion pairs and clusters. Stronger confinement at 0.68 nm leads to reduced conductivity due to steric hindrance. Co-solvents like acetonitrile enhance conductivity further to ~145 S/m, with molecular dynamics simulations supporting the structural interpretations.

Significance. If the central claims hold, this study provides valuable insights into ion transport under extreme confinement, offering a method to enhance conductivity through precise control of channel height and solvent environment. The systematic experimental approach combined with MD simulations establishes a representative system for nano-scale ion transport, with potential applications in energy technologies such as batteries and supercapacitors. The credit goes to the well-defined 2D channel platform and the comparative solvent studies that highlight the roles of dielectric constant and viscosity.

major comments (2)
  1. Abstract: the headline result of a conductivity maximum at h = 1.02 nm linked to ion-pair breakup is load-bearing for the mechanistic claim, but the manuscript provides no quantified uncertainty or sensitivity analysis for the channel height determination via van der Waals assembly of 2D spacers. Actual spacing may vary due to intercalation or contaminants, potentially shifting the peak position and decoupling it from specific layering configurations.
  2. Abstract: the abstract states experimental results on conductivity enhancement without mentioning error bars, raw data, or controls for potential artifacts in the measurements or h calibration, which is necessary to rigorously support the non-monotonic dependence and the interpretation over experimental uncertainties.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for the constructive comments. We respond to each major comment below and indicate the revisions we will make.

read point-by-point responses

  1. Referee: Abstract: the headline result of a conductivity maximum at h = 1.02 nm linked to ion-pair breakup is load-bearing for the mechanistic claim, but the manuscript provides no quantified uncertainty or sensitivity analysis for the channel height determination via van der Waals assembly of 2D spacers. Actual spacing may vary due to intercalation or contaminants, potentially shifting the peak position and decoupling it from specific layering configurations.

    Authors: The channel height in our van der Waals assembled slits is set by the number of atomic layers in the spacer, which are pre-characterized by AFM. We agree that a formal sensitivity analysis would be beneficial to demonstrate robustness against small variations in h. We will add this analysis in the revised manuscript, including an estimate of uncertainty in h (typically ±0.1 nm or less based on layer thickness variations) and show that the conductivity peak remains at approximately 1.02 nm even with such variations. This supports the link to the specific layering configuration observed in MD simulations. revision: yes

  2. Referee: Abstract: the abstract states experimental results on conductivity enhancement without mentioning error bars, raw data, or controls for potential artifacts in the measurements or h calibration, which is necessary to rigorously support the non-monotonic dependence and the interpretation over experimental uncertainties.

    Authors: While the abstract is a high-level summary, we recognize the value in highlighting the rigor of our data. The main text and figures include error bars from multiple measurements, raw conductivity data, and descriptions of controls such as device leakage tests and h calibration via AFM and optical methods. To better convey this in the abstract, we will revise it to include a brief statement on the systematic nature of the measurements and the presence of supporting data with uncertainties in the manuscript body. revision: yes

Circularity Check

0 steps flagged

No significant circularity; results from direct measurements and simulations

full rationale

The paper reports experimental fabrication of angstrom-scale 2D slit channels via van der Waals assembly, systematic variation of confining height h, and direct conductivity measurements showing non-monotonic dependence with a peak of 26.7 S/m at h = 1.02 nm (over 30x bulk). Interpretation attributes this to ion-pair breakup and layer rearrangements, with supporting MD simulations and co-solvent comparisons. No equations, first-principles derivations, or predictions appear that reduce by construction to fitted inputs, self-definitions, or self-citation chains. Central claims rest on observable data and independent simulations rather than load-bearing self-references or ansatz smuggling. This is a standard experimental finding with no circularity in the reported chain.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on experimental conductivity measurements in fabricated channels and MD simulations, with assumptions about accurate channel height control and standard ion-pairing models in ionic liquids.

axioms (2)
  • domain assumption Channel heights in van der Waals assembled 2D slits are precisely controllable and accurately known at the angstrom scale.
    Invoked when attributing conductivity changes to specific confining heights such as 1.02 nm and 0.68 nm.
  • domain assumption Conductivity variations arise primarily from structural rearrangements and breakup of ion pairs rather than other factors.
    Used to explain the non-monotonic dependence and enhanced free ion count.

pith-pipeline@v0.9.0 · 5919 in / 1560 out tokens · 48283 ms · 2026-05-20T08:03:51.522148+00:00 · methodology

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Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

  • IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear
    ?
    unclear

    Relation between the paper passage and the cited Recognition theorem.

    By systematically varying the channel height h, we demonstrate a non-monotonic conductivity dependence on confinement, with a maximum 26.7 S/m at confining height, 1.02 nm... The variation of conductivity with confinement arises from structural rearrangements of ionic layers in the slit channel. Enhanced values of conductivity occur under confinements that promote the breakup of ion pairs and larger clusters

  • IndisputableMonolith/Foundation/AlexanderDuality.lean alexander_duality_circle_linking unclear
    ?
    unclear

    Relation between the paper passage and the cited Recognition theorem.

    At h ~10 Å, however, the ions reorganize into three distinct layers... the emergence of this three-layer structure... disrupts crystal-like ordering... enhancing ionic dynamics

What do these tags mean?
matches
The paper's claim is directly supported by a theorem in the formal canon.
supports
The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends
The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses
The paper appears to rely on the theorem as machinery.
contradicts
The paper's claim conflicts with a theorem or certificate in the canon.
unclear
Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

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