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Molecular simulation evidence for solidlike adsorbate in complex carbonaceous micropore structures.

Mark J Biggs1, Alex Buts, David Williamson

  • 1Institute for Materials and Processes, University of Edinburgh, Kenneth Denbigh Building, King's Buildings, Mayfield Road, Edinburgh EH9 3JL, UK. M.Biggs@ed.ac.uk

Langmuir : the ACS Journal of Surfaces and Colloids
|February 8, 2006
PubMed
Summary

Simulations show that nitrogen vapor forms solid-like adsorbate in nanoporous carbons above freezing point, impacting material characterization. This phenomenon occurs in complex microporous solids and real carbons, suggesting a new approach to understanding adsorption energy.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Understanding gas adsorption in nanoporous materials is crucial for applications like gas storage and separation.
  • Characterizing microporous solids often relies on adsorbate density, but the state of the adsorbate (gas vs. solid-like) can influence these measurements.
  • Previous studies have indirectly suggested solid-like adsorbate behavior in porous materials.

Purpose of the Study:

  • To simulate and analyze the adsorption behavior of nitrogen vapor in complex nanoporous carbon structures.
  • To investigate the formation and implications of solid-like adsorbate at subcritical temperatures.
  • To explore the influence of pore structure, including microporosity and mesoporosity, on adsorption-desorption isotherms and freezing mechanisms.

Main Methods:

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  • Grand canonical Monte Carlo (GCMC) simulations were employed to model nitrogen adsorption.
  • Simulations were conducted at a single subcritical temperature above the bulk freezing point.
  • Analysis included adsorption-desorption isotherms, heats of adsorption, and three-dimensional singlet distribution functions (SDFs).

Main Results:

  • Significant levels of solid-like adsorbate were observed at saturation in complex microporous carbons, consistent with experimental observations.
  • Solid-like adsorbate formation was found to be pressure-dependent and influenced by local porosity.
  • Mesoporosity introduction led to hysteresis, with adsorption occurring via local condensation events and desorption reversal at a single pressure.
  • A local freezing/melting/refreezing process was identified.
  • The empirical concept of 'pore size' was found insufficient for complex solids.

Conclusions:

  • Solid-like adsorbate formation is a significant factor in subcritical vapor adsorption on real noncrystalline solids like microporous carbons.
  • This phenomenon has critical implications for the characterization of microporous materials, particularly when determining pore volume.
  • A new conceptual framework is proposed to better describe adsorption energy, considering local geometry, microtexture, surface atom density, and surface chemistry.