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Electrostatic-field-modulated gas dynamics in charged nanotubes.

Xulong Fan1, Yi Xiao1, Li Zeng2

  • 1Guangxi Key Laboratory of Functional Information Materials and Intelligent Information Processing, School of Physics and Electronics, Nanning Normal University, Nanning, 530100, China.

Journal of Molecular Modeling
|March 31, 2026
PubMed
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External electric fields and charged nanopore walls control gas behavior in nanotubes. Applying an electric field collapses nitrogen nanobubbles, restoring water flow in charged nanopores.

Keywords:
Charged nanotubeElectric field modulationGas dynamicsMolecular dynamics simulation

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Area of Science:

  • Nanofluidics
  • Materials Science
  • Physical Chemistry

Background:

  • Controlling nanoscale gas dynamics in charged nanopores is crucial for applications like gas separation and nanofluidic transport.
  • Understanding gas molecule behavior in nanoporous materials is essential for catalysis and separation technologies.

Purpose of the Study:

  • To investigate how external electric fields and surface charge density influence gas aggregation and water transport in charged nanotubes.
  • To explore the potential for designing electrically controlled nanofluidic valves using charged nanopore materials.

Main Methods:

  • Classical molecular dynamics simulations of a water-nitrogen system within a charged carbon nanotube.
  • System parameters included varying wall charge density and applying axial electric fields (0-0.10 V/Å).
  • Analysis of density distribution, water flux, and molecular orientation using GROMACS and custom scripts.

Main Results:

  • Increased wall charge density promoted gas aggregation and nanobubble formation, hindering water flow.
  • An axial electric field destabilized nitrogen nanobubbles, leading to their collapse and recovery of water transport.
  • Ordered water layers on nanopore walls significantly influenced gas dynamics and liquid flow regulation.

Conclusions:

  • Combined modulation of surface charge and external electric fields offers effective control over gas adsorption/desorption and liquid flow.
  • This study provides a foundation for developing electrically tunable nanofluidic valves for gas storage, sensing, and integrated systems.