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Enhanced Gas Diffusion Coefficient in Water under Tension.

Jianning Xu1, Zehua Yu1, Jinglin Xian1

  • 1MOE Key Laboratory of Hydraulic Machinery Transients, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China.

The Journal of Physical Chemistry Letters
|June 5, 2026
PubMed
Summary
This summary is machine-generated.

Researchers enhanced gas diffusion in water by applying extreme tension to confined water within silica. This method significantly boosted oxygen and nitrogen diffusivity, offering potential for biomedical and energy applications.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Biomedical Engineering

Background:

  • Gas diffusion in water is crucial for biomedical and energy applications.
  • Water molecule interactions inherently restrict gas diffusion.
  • Enhancing gas diffusion in aqueous environments remains a significant challenge.

Purpose of the Study:

  • To investigate the effect of extreme tension on oxygen and nitrogen diffusivity in water.
  • To develop a novel method for enhancing gas diffusion in confined aqueous systems.
  • To explore the underlying mechanisms of tension-induced gas diffusion enhancement.

Main Methods:

  • Encapsulating mesoporous silica (8 nm pores) within a polyacrylamide (PAM) hydrogel matrix.
  • Generating extreme tensile stress in confined water via environmental humidity control.
  • Conducting pressure-driven permeation tests to measure gas diffusion coefficients.
  • Utilizing Raman spectroscopy and molecular dynamics simulations for mechanistic insights.

Main Results:

  • Demonstrated up to 4.7-fold increase in oxygen diffusivity and 3.0-fold increase in nitrogen diffusivity.
  • Achieved significant enhancement under a maximum tensile pressure of -123.7 MPa.
  • Identified dissociation of water clusters and increased intermolecular spacing as key mechanisms.

Conclusions:

  • Extreme tensile stress effectively enhances gas diffusion in confined water.
  • The developed method offers a new strategy for improving gas transport in aqueous media.
  • Potential applications include accelerating chemical reactions and advancing tissue engineering.