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Adsorption and desorption of binary mixtures in confined geometry: A pilot positron annihilation study

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Abstract

In confined (nanometer-scale) geometry, the effects of substrate forces and finite size produce a shift of the gas ⇔ liquid phase boundary from that found in corresponding bulk. The pore transitions also show marked hysteresis. The phase behaviour of a binary gas mixture in confined geometry is likely to depend on the miscibility of the system and the interaction between the substrate and the individual fluid molecules/atoms. Here, we present the results of a pilot positronium annihilation study of the condensation and evaporation of argon-nitrogen mixtures confined in ∼4 nm diameter cylindrical pores in VYCOR glass.

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Authors and Affiliations

  1. H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, BS8 1TL, Bristol, (UK)

    A. P. Clarke, M. A. Alam & H. M. Fretwell

  2. Institut fürr Nukleare Festkörperphysik, Fakultät LRT, Universität der Bundeswehr München, D-85577, Neubiberg, (Germany)

    J. A. Duffy

Authors
  1. A. P. Clarke
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  2. M. A. Alam
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  3. H. M. Fretwell
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  4. J. A. Duffy
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Clarke, A.P., Alam, M.A., Fretwell, H.M. et al. Adsorption and desorption of binary mixtures in confined geometry: A pilot positron annihilation study. Journal of Radioanalytical and Nuclear Chemistry, Articles 211, 165–171 (1996). https://doi.org/10.1007/BF02036269

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  • DOI: https://doi.org/10.1007/BF02036269

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