Interaction thresholds for adsorption of quantum gases on surfaces and within pores of various shapes

Hye Young Kim, Silvina M. Gatica, Milton Walter Cole

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Adsorption within pores and on surfaces occurs because of the attractive potential provided by the adsorbent. If the attraction is too weak, however, adsorption does not occur to any significant extent. This paper evaluates the criterion for such adsorption, at zero temperature, of the quantum gases 4He and H2. This criterion is expressed as a relationship between a threshold value of the well-depth (D) of the adsorption potential (on a semi-infinite planar surface) and the hard-core diameter (σ) of the gas-surface pair potential. Six geometries are considered, of which two result in two-dimensional (2D) adsorbed phases, two result in one-dimensional (1D) phases, and two result in zero-dimensional phases. These are monolayer films on semi-infinite substrates or within a slit pore, linear or axial phases within cylindrical pores (within bulk solids) or cylindrical tubes, and single-particle adsorption within spherical pores or hollow spherical cavities, respectively. The criteria for film adsorption are consistent with analogous criteria for film wetting to occur, evaluated with a simple thermodynamic model.

Original languageEnglish (US)
Pages (from-to)12439-12446
Number of pages8
JournalJournal of Physical Chemistry A
Volume111
Issue number49
DOIs
StatePublished - Dec 13 2007

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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