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Title: Fluid phase behaviour in porous media studied by Doppler broadening position annihilation spectroscopy
Author: Jones, D. G.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2003
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A comprehensive Doppler broadening positron annihilation spectroscopy study of the confined phase behaviour of pure Argon, pure Krypton and their binary mixtures has been carried out by the author, within the Physics department at the University of Wales Swansea and the results of this work are presented in this thesis. Analysis of changes in photon energy spectra, resulting from positron annihilation within the sample, has yielded clear information regarding the state of the sample fluid confined in the nanometer pores of VYCOR glass. In particular, isothermal and isobaric experiments were performed in order to elucidate the location of confined phase transitions in terms of fluid temperature or pressure. The hysteresis associated with confined phase transitions was also investigated, for both freezing/melting and condensation/evaporation. In tandem with this work, a variable energy positron beam study was also undertaken, at the Technical University of Delft in the Netherlands. In particular, the Ni-SiC system and the thermal nature of the Schottky and Ohmic contacts was investigated.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available