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Pré-Publication, Document De Travail Année : 2003

Intrusion and extrusion of water in hydrophobic mesopores

Résumé

We present experimental and theoretical results onintrusion-extrusion cycles of water in hydrophobic mesoporousmaterials, characterized by independent cylindrical pores. Theintrusion, which takes place above the bulk saturation pressure,can be well described using a macroscopic capillary model. Oncethe material is saturated with water, extrusion takes place uponreduction of the externally applied pressure; Our results for theextrusion pressure can only be understood by assuming that thelimiting extrusion mechanism is the nucleation of a vapour bubbleinside the pores. A comparison of calculated and experimentalnucleation pressures shows that a proper inclusion of line tensioneffects is necessary to account for the observed values ofnucleation barriers. Negative line tensions of order $10^{-11}\mathrm{J.m}^{-1}$ are found for our system, in reasonableagreement with other experimental estimates of this quantity.
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Dates et versions

hal-00000575 , version 1 (03-09-2003)

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Jean-Louis Barrat, Benoit Lefevre, Lyderic Bocquet, Anthony Saugey, Gérard Vigier, et al.. Intrusion and extrusion of water in hydrophobic mesopores. 2003. ⟨hal-00000575⟩
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