Scanning curves in wedge pore with the wide end closed: effects of temperature

Klomkliang, Nikom, Do, Duong D. and Nicholson, David (2015) Scanning curves in wedge pore with the wide end closed: effects of temperature. AI Ch E Journal, 61 11: 3936-3943. doi:10.1002/aic.14905


Author Klomkliang, Nikom
Do, Duong D.
Nicholson, David
Title Scanning curves in wedge pore with the wide end closed: effects of temperature
Journal name AI Ch E Journal   Check publisher's open access policy
ISSN 1547-5905
0001-1541
Publication date 2015-11-01
Sub-type Article (original research)
DOI 10.1002/aic.14905
Open Access Status Not Open Access
Volume 61
Issue 11
Start page 3936
End page 3943
Total pages 8
Place of publication Hoboken, NJ, United States
Publisher John Wiley and Sons
Collection year 2016
Language eng
Abstract The desorption scanning curves within the hysteresis loop of argon adsorbed in a wedge-shaped pore with its wide end closed have been studied in the temperature range between 60 and 87 K, using grand canonical Monte Carlo simulation. The distinct features are: (1) adsorbate packing follows a sequence of commensurate regions (zones) and incommensurate regions (junctions); (2) the mechanism for evaporation switches from cavitation-like pore blocking to cavitation when the temperature is increased; as typically observed for ink-bottle pores. When cavitation is the operating mechanism, the descending scanning curve spans across the loop in two stages: a gradual decrease in density in a zone followed by a sharp evaporation from a junction, and then terminates at the lowest point on the vertical cavitation boundary. The adsorption scanning curve proceeds across the loop in two stages complementary to the desorption scanning-curve: a gradual change in density at a junction followed by a sharp change through a zone. Conversely, when cavitation-like pore blocking is operating, the descending curve leaves the adsorption boundary, spans across the hysteresis loop and returns to a different point on the same boundary, rather than to the desorption boundary or to the lower closure point. This feature does not seem to have been recognized in earlier literature and should be considered in the classification of scanning curves.
Keyword Adsorption
Cavitation
Desorption
Hysteresis
Monte Carlo simulation
Pore blocking
Scanning curve
Wedge pore
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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