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Evolution of Staircase Structures in Diffusive Convection
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Layered Fluid Structure and Anomalous Diffusion under Nanoconfinement.

Gerald J Wang1, Nicolas G Hadjiconstantinou1

  • 1Department of Mechanical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 19, 2018
PubMed
Summary
This summary is machine-generated.

Molecular layering at confining boundaries significantly impacts fluid self-diffusion. The Wall number (Wa) quantifies this effect, revealing restricted dynamics and hopping processes at Wa ≳ 1.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Molecular diffusion behavior deviates significantly under nanoconfinement compared to bulk fluids.
  • Understanding these deviations is crucial for designing nanoscale devices and materials.

Purpose of the Study:

  • To elucidate the influence of boundary layering on the self-diffusion of confined fluids.
  • To quantify the relationship between layering and anomalous diffusion dynamics.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model fluid behavior.
  • Molecular mechanics arguments were used to analyze the simulation results.

Main Results:

  • Anomalous diffusion is controlled by the degree of layering, quantified by the Wall number (Wa).
  • At Wa ≳ 1, significant layering restricts fluid dynamics, necessitating thermally activated hopping for movement.
  • Diffusivity can be approximated as a weighted average of bulk and first-layer diffusivities.

Conclusions:

  • The Wall number (Wa) effectively predicts the impact of layering on diffusion.
  • Layering-induced deviations from bulk diffusion can be quantified based on confinement length scale.