On the hysteresis loop and equilibrium transition in slit-shaped ink-bottle pores

Klomkliang, Nikom, Do, D. D. and Nicholson, D. (2013) On the hysteresis loop and equilibrium transition in slit-shaped ink-bottle pores. Adsorption-Journal of the International Adsorption Society, 19 6: 1273-1290. doi:10.1007/s10450-013-9569-5

Author Klomkliang, Nikom
Do, D. D.
Nicholson, D.
Title On the hysteresis loop and equilibrium transition in slit-shaped ink-bottle pores
Journal name Adsorption-Journal of the International Adsorption Society   Check publisher's open access policy
ISSN 0929-5607
Publication date 2013-12-01
Sub-type Article (original research)
DOI 10.1007/s10450-013-9569-5
Open Access Status
Volume 19
Issue 6
Start page 1273
End page 1290
Total pages 18
Place of publication New York, NY, United States
Publisher Springer
Language eng
Abstract Bin grand canonical Monte Carlo simulations have been carried out to study adsorption-desorption of argon at 87.3 K in a model ink-bottle mesoporous solid in order to investigate the interplay between the pore blocking process, controlled by the evaporation through the pore mouth via the meniscus separating the adsorbate and the bulk gas surroundings, and the cavitation process, governed by the instability of the stretched fluid (with a decrease in pressure) in the cavity. The evaporation mechanism switches from pore blocking to cavitation when the size of the pore neck is decreased, and is relatively insensitive to the neck length under conditions where cavitation is the controlling mechanism. We have applied the recently-developed Mid-Density scheme to determine the equilibrium branch of the hysteresis loop, and have found that, unlike ideal simple pores of constant size and infinite length, where the equilibrium transition is vertical, the equilibrium branch of an ink-bottle pore has three distinct sub-branches within the hysteresis loop. The first sub-branch is steep but continuous and is close to the desorption branch (which is typical for a pore with two open ends); this is associated with the equilibrium state in the neck. The third sub-branch is much steeper and is close to the adsorption branch (which is typical for either a pore with one end closed or a closed pore), and is associated with the equilibrium state in the cavity. The second sub-branch, connecting the other two sub-branches, has a more gradual slope. The domains of these three sub-branches depend on the relative sizes of the cavity and the neck, and their respective lengths. Our investigation of the effects of changing neck length clearly demonstrates that cavitation depends, not only on fluid properties, as frequently stated, but also on pore geometry.
Keyword Adsorption
Ink-bottle pores
Pore blocking
Equilibrium transition
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 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
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