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Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-26572
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dc.contributor.authorCalzaferri, Gion-
dc.contributor.authorGallagher, Samuel H.-
dc.contributor.authorLustenberger, Simon-
dc.contributor.authorWalther, Fabian-
dc.contributor.authorBrühwiler, Dominik-
dc.date.accessioned2023-01-11T11:40:12Z-
dc.date.available2023-01-11T11:40:12Z-
dc.date.issued2023-
dc.identifier.issn0254-0584de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/26572-
dc.description.abstractWe report argon adsorption/desorption isotherms of MCM-41 and of SBA-15. The shape of all hysteresis loops we have observed corresponds to type H1. The data have been analyzed quantitatively using the multiple equilibria description and applying the notion of metastable thermodynamic equilibrium. It is remarkable and important that for both mesoporous materials the desorption process can be understood according to this description but with a corresponding equilibrium constant. This procedure therefore allows determining the thermodynamic values for the enthalpy and the free enthalpy of cavity desorption and thus to obtain information not available so far. We observed that the MCM-41 adsorption isotherms show first an increase with the characteristic Langmuir shape, followed by the almost instantaneous filling of cavities that ends as soon as all cavities are completely filled. The SBA-15 isotherms show a characteristic Langmuir shape at low relative pressure. The pressure slightly below the inflection point at prel, infl = 0.312 marks the beginning of the growth of a second layer, before an almost instantaneous filling of cavities takes place. It is interesting to observe that the values of the enthalpy and the free enthalpy for cavity filling and cavity desorption differ by about 0.1 kJ/mol for both, MCM-41 and SBA-15. This means that the driving force for developing a hysteresis is small. The hysteresis loop is therefore driven by delicate changes occurring within the cavities, partially or completely filled by the adsorbate. The monolayer coverage and monolayer desorption processes are decoupled from the cavity filling and cavity emptying processes. Knowing thermodynamic parameters for the hysteresis loop ultimately helps to better characterize and understand the experimental observations.de_CH
dc.language.isoende_CH
dc.publisherElsevierde_CH
dc.relation.ispartofMaterials Chemistry and Physicsde_CH
dc.rightshttp://creativecommons.org/licenses/by/4.0/de_CH
dc.subject.ddc540: Chemiede_CH
dc.titleMultiple equilibria description of type H1 hysteresis in gas sorption isotherms of mesoporous materialsde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementLife Sciences und Facility Managementde_CH
zhaw.organisationalunitInstitut für Chemie und Biotechnologie (ICBT)de_CH
dc.identifier.doi10.1016/j.matchemphys.2022.127121de_CH
dc.identifier.doi10.21256/zhaw-26572-
zhaw.funding.euNode_CH
zhaw.issue127121de_CH
zhaw.originated.zhawYesde_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume296de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.funding.snf172805de_CH
zhaw.webfeedPolymerchemiede_CH
zhaw.author.additionalNode_CH
zhaw.display.portraitYesde_CH
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Calzaferri, G., Gallagher, S. H., Lustenberger, S., Walther, F., & Brühwiler, D. (2023). Multiple equilibria description of type H1 hysteresis in gas sorption isotherms of mesoporous materials. Materials Chemistry and Physics, 296(127121). https://doi.org/10.1016/j.matchemphys.2022.127121
Calzaferri, G. et al. (2023) ‘Multiple equilibria description of type H1 hysteresis in gas sorption isotherms of mesoporous materials’, Materials Chemistry and Physics, 296(127121). Available at: https://doi.org/10.1016/j.matchemphys.2022.127121.
G. Calzaferri, S. H. Gallagher, S. Lustenberger, F. Walther, and D. Brühwiler, “Multiple equilibria description of type H1 hysteresis in gas sorption isotherms of mesoporous materials,” Materials Chemistry and Physics, vol. 296, no. 127121, 2023, doi: 10.1016/j.matchemphys.2022.127121.
CALZAFERRI, Gion, Samuel H. GALLAGHER, Simon LUSTENBERGER, Fabian WALTHER und Dominik BRÜHWILER, 2023. Multiple equilibria description of type H1 hysteresis in gas sorption isotherms of mesoporous materials. Materials Chemistry and Physics. 2023. Bd. 296, Nr. 127121. DOI 10.1016/j.matchemphys.2022.127121
Calzaferri, Gion, Samuel H. Gallagher, Simon Lustenberger, Fabian Walther, and Dominik Brühwiler. 2023. “Multiple Equilibria Description of Type H1 Hysteresis in Gas Sorption Isotherms of Mesoporous Materials.” Materials Chemistry and Physics 296 (127121). https://doi.org/10.1016/j.matchemphys.2022.127121.
Calzaferri, Gion, et al. “Multiple Equilibria Description of Type H1 Hysteresis in Gas Sorption Isotherms of Mesoporous Materials.” Materials Chemistry and Physics, vol. 296, no. 127121, 2023, https://doi.org/10.1016/j.matchemphys.2022.127121.


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