Undulation theory and analysis of capillary condensation in cylindrical and spherical pores

Phadungbut, Poomiwat, Do, D. D. and Nicholson, D. (2015) Undulation theory and analysis of capillary condensation in cylindrical and spherical pores. Journal of Physical Chemistry C, 119 35: 20433-20445. doi:10.1021/acs.jpcc.5b04789

Author Phadungbut, Poomiwat
Do, D. D.
Nicholson, D.
Title Undulation theory and analysis of capillary condensation in cylindrical and spherical pores
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7455
Publication date 2015-09-03
Year available 2015
Sub-type Article (original research)
DOI 10.1021/acs.jpcc.5b04789
Open Access Status Not Open Access
Volume 119
Issue 35
Start page 20433
End page 20445
Total pages 13
Place of publication Washington, DC United States
Publisher American Chemical Society
Collection year 2016
Language eng
Abstract The undulation theory, recently developed to explain the mechanism of the onset of condensation in an open end slit pore, is extended to investigate the effects of pore diameter, pore wall curvature, temperature, and surface strength on the condensation of argon in cylindrical and spherical pores. Using the concept of an undulating interface separating the adsorbed phase and the gas-like core, we can determine the mean thickness of the adsorbate phase and thus the mean radius of the gas-like core just before condensation. The radius of curvature of the core is used in the Cohan–Kelvin equation, modified to account for the contribution from the solid–fluid interaction (better known as the Derjaguin–Broekhoff–de Boer equation), to derive the interfacial energy parameter. For cylinders and spheres, this parameter is always greater than the bulk phase value, which is used in the unmodified Cohan–Kelvin equation but converges to the bulk value as the pore diameter is increased. For spheres, the energy parameter is smaller than in cylinders of the same diameter but is still higher than the bulk value for pore diameters less than 6 nm. This difference is attributed to packing effects in the 3D-confined spherical geometry. This shows the interesting interplay between packing effects in 3D-spherical confinement and the cohesiveness of the adsorbate enhanced by the solid–fluid interaction.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
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