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Publikationstyp: Beitrag in wissenschaftlicher Zeitschrift
Art der Begutachtung: Open peer review
Titel: The role of contact angle and pore width on pore condensation and freezing
Autor/-in: David, Robert O.
Fahrni, Jonas
Marcolli, Claudia
Mahrt, Fabian
Brühwiler, Dominik
Kanji, Zamin A.
et. al: No
DOI: 10.5194/acp-20-9419-2020
10.21256/zhaw-20353
Erschienen in: Atmospheric Chemistry and Physics
Band(Heft): 20
Heft: 15
Seiten: 9419
Seiten bis: 9440
Erscheinungsdatum: 12-Aug-2020
Verlag / Hrsg. Institution: Copernicus
ISSN: 1680-7316
1680-7324
Sprache: Englisch
Fachgebiet (DDC): 500: Naturwissenschaften und Mathematik
Zusammenfassung: It has recently been shown that pore condensation and freezing (PCF) is a mechanism responsible for ice formation under cirrus cloud conditions. PCF is defined as the condensation of liquid water in narrow capillaries below water saturation due to the inverse Kelvin effect, followed by either heterogeneous or homogeneous nucleation depending on the temperature regime and presence of an ice-nucleating active site. By using sol–gel synthesized silica with well-defined pore diameters, morphology and distinct chemical surface-functionalization, the role of the water–silica contact angle and pore width on PCF is investigated. We find that for the pore diameters (2.2–9.2 nm) and water contact angles (15–78°) covered in this study, our results reveal that the water contact angle plays an important role in predicting the humidity required for pore filling, while the pore diameter determines the ability of pore water to freeze. For T>235 K and below water saturation, pore diameters and water contact angles were not able to predict the freezing ability of the particles, suggesting an absence of active sites; thus ice nucleation did not proceed via a PCF mechanism. Rather, the ice-nucleating ability of the particles depended solely on chemical functionalization. Therefore, parameterizations for the ice-nucleating abilities of particles in cirrus conditions should differ from parameterizations at mixed-phase clouds conditions. Our results support PCF as the atmospherically relevant ice nucleation mechanism below water saturation when porous surfaces are encountered in the troposphere.
URI: https://digitalcollection.zhaw.ch/handle/11475/20353
Volltext Version: Publizierte Version
Lizenz (gemäss Verlagsvertrag): CC BY 4.0: Namensnennung 4.0 International
Departement: Life Sciences und Facility Management
Organisationseinheit: Institut für Chemie und Biotechnologie (ICBT)
Publiziert im Rahmen des ZHAW-Projekts: Untersuchung der Eisbildungsmechanismen in der Atmosphäre
Enthalten in den Sammlungen:Publikationen Life Sciences und Facility Management

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