Confinement of Water in Hydrophobic Nanopores: Effect of the Geometry on the Energy of Intrusion

Affiliation auteurs!!!! Error affiliation !!!!
TitreConfinement of Water in Hydrophobic Nanopores: Effect of the Geometry on the Energy of Intrusion
Type de publicationJournal Article
Year of Publication2014
AuteursKarbowiak T, Weber G, Bellat J-P
JournalLANGMUIR
Volume30
Pagination213-219
Date PublishedJAN 14
Type of ArticleArticle
ISSN0743-7463
Résumé

Water confinement in the hydrophobic nanopores of highly siliceous zeolite having MFI and CHA topology is investigated by high pressure manometry coupled to differential calorimetry. Surprisingly, the intrusion of water is endothermic for MFI but exothermic for CHA. This phase S transition depends on the geometry of the environment in which water is confined: channels (MFI) or cavities (CHA). The energy of intrusion is mainly governed by the change in the coordination of water molecules when they are forced to enter the nanopores and to adopt a weaker, hydrogen-bonded structure. At such a nanoscale, the properties of the molecules are governed strongly by geometrical restraints. This implies that the use of classical macroscopic equations such as Laplace-Washburn will have limitations at the molecular level.

DOI10.1021/la4043183