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231225s2019 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.8b03634
|2 doi
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|a pubmed24n0973.xml
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|a eng
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| 100 |
1 |
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|a Loi, Quang K
|e verfasserin
|4 aut
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|a Nonwetting/Prewetting/Wetting Transition of Ammonia on Graphite
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|c 2019
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Revised 20.11.2019
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Simulations of ammonia adsorption on graphite were carried out over a range of temperatures to investigate the transition from nonwetting to wetting. The process is governed by a subtle interplay between the various interactions in the system and the temperature. At temperatures below the bulk triple point, the system is nonwetting; above the triple point, we observed continuous wetting, preceded by a prewetting region in which the so-called thin-to-thick film transition occurs. This system serves as an excellent example of wetting/nonwetting behavior in an associating fluid as a function of temperature because the heat of sublimation (or condensation) is greater than the isosteric heat of adsorption at zero loading. The nonwetting-to-wetting transition (NW/W) is also strongly affected by the adsorbate-adsorbate interaction, which becomes important when this contribution to the isosteric heat is of a similar magnitude to the heat of condensation. An appropriate indicator of a NW/W transition at a given loading is therefore the difference between the isosteric heat and the heat of sublimation (or condensation). Our simulation results show the "thin-to-thick" film transition in the temperature range between 195 and 240 K, which has not been previously explained. Above 240 K, continuous wetting occurs. This study provides a basis for a better understanding of adsorption in a range of systems because ammonia is an intermediate between simple molecules, such as argon, and strongly associating fluids, such as water
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|a Journal Article
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|a Prasetyo, Luisa
|e verfasserin
|4 aut
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|a Tan, Shiliang
|e verfasserin
|4 aut
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|a Do, D D
|e verfasserin
|4 aut
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|a Nicholson, D
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 35(2019), 3 vom: 22. Jan., Seite 641-652
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|x 1520-5827
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|g volume:35
|g year:2019
|g number:3
|g day:22
|g month:01
|g pages:641-652
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|u http://dx.doi.org/10.1021/acs.langmuir.8b03634
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