Determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions
A new method, employing computer simulation, is proposed for the determination of the location of the interface separating the adsorbed phase from the adjacent gas phase, giving a means to calculate the "absolute" amount adsorbed. The method involves monitoring the fraction of successful i...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/45712 |
| _version_ | 1848757361484759040 |
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| author | Phadungbut, P. Fan, Chunyan Do, D. Nicholson, D. Tangsathitkulchai, C. |
| author_facet | Phadungbut, P. Fan, Chunyan Do, D. Nicholson, D. Tangsathitkulchai, C. |
| author_sort | Phadungbut, P. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A new method, employing computer simulation, is proposed for the determination of the location of the interface separating the adsorbed phase from the adjacent gas phase, giving a means to calculate the "absolute" amount adsorbed. The method involves monitoring the fraction of successful insertions of molecules into differential volumes in the simulation box. By applying the concept of equal areas, as implemented in the determination of the Gibbs dividing surface, for the profile of the fraction of success versus distance, we are able to determine the location of the interface bounding the adsorbed phase. This allows us to find (1) the thickness of the adsorbed phase, (2) the absolute surface density (absolute loading) and (3) the volumetric density of the adsorbed phase, as functions of pressure. Knowing the absolute surface density as a function of pressure at different temperatures, we are able to calculate the heat of adsorption as a function of loading, using the Clausius-Clapeyron equation and to show that this is consistent with the heat obtained from the fluctuation formula in grand canonical Monte Carlo simulations. |
| first_indexed | 2025-11-14T09:26:52Z |
| format | Journal Article |
| id | curtin-20.500.11937-45712 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:26:52Z |
| publishDate | 2015 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-457122018-03-29T09:07:45Z Determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions Phadungbut, P. Fan, Chunyan Do, D. Nicholson, D. Tangsathitkulchai, C. A new method, employing computer simulation, is proposed for the determination of the location of the interface separating the adsorbed phase from the adjacent gas phase, giving a means to calculate the "absolute" amount adsorbed. The method involves monitoring the fraction of successful insertions of molecules into differential volumes in the simulation box. By applying the concept of equal areas, as implemented in the determination of the Gibbs dividing surface, for the profile of the fraction of success versus distance, we are able to determine the location of the interface bounding the adsorbed phase. This allows us to find (1) the thickness of the adsorbed phase, (2) the absolute surface density (absolute loading) and (3) the volumetric density of the adsorbed phase, as functions of pressure. Knowing the absolute surface density as a function of pressure at different temperatures, we are able to calculate the heat of adsorption as a function of loading, using the Clausius-Clapeyron equation and to show that this is consistent with the heat obtained from the fluctuation formula in grand canonical Monte Carlo simulations. 2015 Journal Article http://hdl.handle.net/20.500.11937/45712 10.1016/j.colsurfa.2015.04.011 Elsevier restricted |
| spellingShingle | Phadungbut, P. Fan, Chunyan Do, D. Nicholson, D. Tangsathitkulchai, C. Determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions |
| title | Determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions |
| title_full | Determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions |
| title_fullStr | Determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions |
| title_full_unstemmed | Determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions |
| title_short | Determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions |
| title_sort | determination of absolute adsorption for argon on flat surfaces under sub- and supercritical conditions |
| url | http://hdl.handle.net/20.500.11937/45712 |