Phase transitions of CO2confined in nanometer pores as revealed by positronium annihilation
- 11 December 1995
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 7 (50) , L713-L717
- https://doi.org/10.1088/0953-8984/7/50/003
Abstract
The results of a comprehensive positronium annihilation study of the phase behaviour of carbon dioxide in porous Vycor glass are presented. Isobaric measurements of the 3 gamma :2 gamma annihilation ratio show that on cooling, the gas-liquid phase boundary is raised by ~5 K while the liquid-solid transition is depressed by ~12 K relative to the bulk. The resulting phase diagram suggests the existence of a `triple point` of the confined fluid at a temperature ~10 K and a pressure ~2 bar below the bulk triple point.Keywords
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