Condensation and evaporation in slit-shaped pores: Effects of adsorbate layer structure and temperature

Zeng, Yonghong, Fan, Chunyan, Do, D. D. and Nicholson, D. (2014) Condensation and evaporation in slit-shaped pores: Effects of adsorbate layer structure and temperature. Journal of Physical Chemistry C, 118 6: 3172-3180. doi:10.1021/jp412376w


Author Zeng, Yonghong
Fan, Chunyan
Do, D. D.
Nicholson, D.
Title Condensation and evaporation in slit-shaped pores: Effects of adsorbate layer structure and temperature
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2014-02-13
Year available 2014
Sub-type Article (original research)
DOI 10.1021/jp412376w
Open Access Status DOI
Volume 118
Issue 6
Start page 3172
End page 3180
Total pages 9
Place of publication Washington, DC United States
Publisher American Chemical Society
Collection year 2015
Language eng
Subject 1606 Political Science
2504 Electronic, Optical and Magnetic Materials
2508 Surfaces, Coatings and Films
2100 Energy
Abstract We have carried out an extensive computer simulation study of the effects of temperature on adsorption and desorption of argon in two slit mesopores; one of which has both ends open to the surroundings, and the other with one end closed, to explore the fundamental reasons for the disappearance of the hysteresis loop as the temperature approaches the critical hysteresis temperature, Tch. Detailed mechanisms are presented for adsorption and desorption. At temperatures below Tch, both adsorption and desorption branches of the isotherm are metastable resulting in a hysteresis loop. As the temperature is increased, waves, due to thermal fluctuations, appear at the boundary between the dense adsorbed phase close to the pore walls and the gas-like phase in the core. For temperatures above Tch, these thermal fluctuations override the formation and subsequent movement of the meniscus (interface); adsorption is entirely due to the densification of the adsorbate, and desorption proceeds by rarefaction of the adsorbate. This mechanism gives rise to reversible isotherms in open ended pores and in the corresponding closed end pores; consequently, the critical hysteresis temperature in open and closed pores is the same; a result that has not been previously noted in the literature.
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 2015 Collection
 
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