---
OA_place: publisher
OA_type: hybrid
_id: '19279'
abstract:
- lang: eng
  text: Recent experimental advances in nanofluidics have allowed to explore ion transport
    across molecular-scale pores, in particular, for iontronic applications. Two-dimensional
    nanochannels—in which a single molecular layer of electrolyte is confined between
    solid walls—constitute a unique platform to investigate fluid and ion transport
    in extreme confinement, highlighting unconventional transport properties. In this
    work, we study ionic association in 2D nanochannels, and its consequences on non-linear
    ionic transport, using both molecular dynamics simulations and analytical theory.
    We show that under sufficient confinement, ions assemble into pairs or larger
    clusters in a process analogous to a Kosterlitz–Thouless transition, here modified
    by the dielectric confinement. We further show that the breaking of pairs results
    in an electric-field dependent conduction, a mechanism usually known as the second
    Wien effect. However the 2D nature of the system results in non-universal, temperature-dependent,
    scaling of the conductivity with electric field, leading to ionic coulomb blockade
    in some regimes. A 2D generalization of the Onsager theory fully accounts for
    the non-linear transport. These results suggest ways to exploit electrostatic
    interactions between ions to build new nanofluidic devices.
acknowledgement: The authors thank B. Coquinot and G. Monet for fruitful discussions.
  L.B. acknowledges support from ERC-Synergy Grant Agreement No. 101071937, n-AQUA.
  P.R. acknowledges support from the European Union’s Horizon 2020 research and innovation
  program under Marie Sklodowska-Curie Grant Agreement No. 101034413.
article_number: '064703'
article_processing_charge: Yes (in subscription journal)
article_type: original
arxiv: 1
author:
- first_name: Damien
  full_name: Toquer, Damien
  last_name: Toquer
- first_name: Lydéric
  full_name: Bocquet, Lydéric
  last_name: Bocquet
- first_name: Paul
  full_name: Robin, Paul
  id: 48c58128-57b0-11ee-9095-dc28fd97fc1d
  last_name: Robin
  orcid: 0000-0002-5728-9189
citation:
  ama: Toquer D, Bocquet L, Robin P. Ionic association and Wien effect in 2D confined
    electrolytes. <i>Journal of Chemical Physics</i>. 2025;162(6). doi:<a href="https://doi.org/10.1063/5.0241949">10.1063/5.0241949</a>
  apa: Toquer, D., Bocquet, L., &#38; Robin, P. (2025). Ionic association and Wien
    effect in 2D confined electrolytes. <i>Journal of Chemical Physics</i>. AIP Publishing.
    <a href="https://doi.org/10.1063/5.0241949">https://doi.org/10.1063/5.0241949</a>
  chicago: Toquer, Damien, Lydéric Bocquet, and Paul Robin. “Ionic Association and
    Wien Effect in 2D Confined Electrolytes.” <i>Journal of Chemical Physics</i>.
    AIP Publishing, 2025. <a href="https://doi.org/10.1063/5.0241949">https://doi.org/10.1063/5.0241949</a>.
  ieee: D. Toquer, L. Bocquet, and P. Robin, “Ionic association and Wien effect in
    2D confined electrolytes,” <i>Journal of Chemical Physics</i>, vol. 162, no. 6.
    AIP Publishing, 2025.
  ista: Toquer D, Bocquet L, Robin P. 2025. Ionic association and Wien effect in 2D
    confined electrolytes. Journal of Chemical Physics. 162(6), 064703.
  mla: Toquer, Damien, et al. “Ionic Association and Wien Effect in 2D Confined Electrolytes.”
    <i>Journal of Chemical Physics</i>, vol. 162, no. 6, 064703, AIP Publishing, 2025,
    doi:<a href="https://doi.org/10.1063/5.0241949">10.1063/5.0241949</a>.
  short: D. Toquer, L. Bocquet, P. Robin, Journal of Chemical Physics 162 (2025).
corr_author: '1'
date_created: 2025-03-02T23:01:52Z
date_published: 2025-02-14T00:00:00Z
date_updated: 2025-09-30T10:44:48Z
day: '14'
ddc:
- '540'
department:
- _id: EdHa
doi: 10.1063/5.0241949
ec_funded: 1
external_id:
  arxiv:
  - '2410.03316'
  isi:
  - '001421300300001'
  pmid:
  - '39932241'
file:
- access_level: open_access
  checksum: c9008c2c50c917673aa588f75acbcb40
  content_type: application/pdf
  creator: dernst
  date_created: 2025-03-04T10:29:36Z
  date_updated: 2025-03-04T10:29:36Z
  file_id: '19290'
  file_name: 2025_JourChemicalPhysics_Toquer.pdf
  file_size: 5807062
  relation: main_file
  success: 1
file_date_updated: 2025-03-04T10:29:36Z
has_accepted_license: '1'
intvolume: '       162'
isi: 1
issue: '6'
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
  call_identifier: H2020
  grant_number: '101034413'
  name: 'IST-BRIDGE: International postdoctoral program'
publication: Journal of Chemical Physics
publication_identifier:
  eissn:
  - 1089-7690
  issn:
  - 0021-9606
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Ionic association and Wien effect in 2D confined electrolytes
tmp:
  image: /images/cc_by_nc_nd.png
  legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
  name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
    (CC BY-NC-ND 4.0)
  short: CC BY-NC-ND (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 162
year: '2025'
...