Lattice model of gas condensation within nanopores

Raluca A. Trasca, M. Mercedes Calbi, Milton W. Cole

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Abstract

We explore the thermodynamic behavior of gases adsorbed within a nanopore. The theoretical description employs a simple lattice gas model, with two species of site, expected to describe various regimes of adsorption and condensation behavior. The model includes four hypothetical phases: a cylindrical shell phase [formula presented] in which the sites close to the cylindrical wall are occupied, an axial phase [formula presented] in which sites along the cylinder’s axis are occupied, a full phase [formula presented] in which all sites are occupied, and an empty phase [formula presented] We obtain exact results at [formula presented] for the phase behavior, which is a function of the interactions present in any specific problem. We obtain the corresponding results at finite T from mean field theory. Finally, we examine the model’s predicted phase behavior of some real gases adsorbed in nanopores.

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All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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