Adsorption and desorption of binary mixtures in confined geometry: A pilot positron annihilation study |
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| Authors: | A P Clarke M A Alam H M Fretwell J A Duffy |
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| Institution: | (1) H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, BS8 1TL Bristol, (UK);(2) Institut fürr Nukleare Festkörperphysik, Fakultät LRT, Universität der Bundeswehr München, D-85577 Neubiberg, (Germany) |
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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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