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Gas oversolubility in nanoporous materials significantly reduces water and ion movement. This effect, linked to increased fluid viscosity, impacts geological processes and separations.

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Area of Science:

  • Nanoscale science
  • Physical chemistry
  • Geophysics

Background:

  • Oversolubility, higher gas solubility in nanoconfined liquids than bulk, is known but its dynamic impact is unexplored.
  • This phenomenon is crucial for separations, catalysis, and geological applications like pollutant migration and carbon capture.

Purpose of the Study:

  • To investigate the impact of gas oversolubility on fluid dynamics in hydrated nanoporous materials.
  • To explore the relationship between oversolubility, viscosity, and diffusion of water and ions.

Main Methods:

  • Atom-scale simulations
  • Nuclear Magnetic Resonance (NMR) experiments

Main Results:

  • Gas oversolubility was confirmed in hydrated nanoporous materials, reducing water and ion diffusivities by 10-60%.
  • Diffusivity reduction is linked to increased confined fluid viscosity due to decreased free volume, rationalized by the Stokes-Einstein relation.
  • The dynamical slowdown affects water and ions identically, intensifying with stronger gas-liquid/solid interactions.

Conclusions:

  • Oversolubility significantly impacts fluid dynamics in nanoporous systems.
  • A formalism is provided to understand fluid diffusion under gas solubility effects in nanoconfined environments.
  • Findings are relevant for geological applications and separation technologies.