Article (Scientific journals)
Two-Step Wetting of Nanoporous Carbons: Small-Angle Scattering Analysis of Capillary Rise.
Chaltin, François; Rosenthal, Martin; Léonard, Alexandre et al.
2024In Langmuir, 40 (39), p. 20604 - 20615
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Keywords :
Capillary rise; Condition; Mesopore; Micropores; Nanometer-sized pore; Nanoporous carbons; Nanoporous Materials; Scattering analysis; Small angle scattering; Small-angle scattering; Materials Science (all); Condensed Matter Physics; Surfaces and Interfaces; Spectroscopy; Electrochemistry
Abstract :
[en] Numerous applications of nanoporous materials require their pores to be filled with liquids. In spite of its huge technological importance, the conditions for the wetting of nanometer-sized pores and its phenomenology are still poorly understood. We report on capillary rise experiments with water in carbon xerogels, with synchrotron small-angle scattering used to follow the process in situ at the nanometer scale. The data reveal a two-step wetting process whereby water permeates first into molecular-sized micropores, which is followed by the imbibition of larger mesopores. A Cassie-Baxter analysis shows that the presence of water in the micropores is central, as it turns the mesopores from being hydrophobic to hydrophilic. Based on the so-calculated contact angles, the mesopore wetting kinetics are found to be quantitatively described by a classical Washburn model. Modeling of the experimental water profile ahead of the Washburn front reveals strong surface barriers opposing water transfer from the mesopores to the micropores.
Disciplines :
Physics
Materials science & engineering
Author, co-author :
Chaltin, François  ;  Université de Liège - ULiège > Chemical engineering
Rosenthal, Martin ;  Dual-Belgian-Beamline (DUBBLE, BM26), European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS40220, Grenoble 38043, Cedex 9, France ; Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Box 2404, 3001 Leuven, Belgium
Léonard, Alexandre  ;  Université de Liège - ULiège > Chemical engineering
Goderis, Bart ;  Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Box 2404, 3001 Leuven, Belgium
Gommes, Cédric  ;  Université de Liège - ULiège > Department of Chemical Engineering
Language :
English
Title :
Two-Step Wetting of Nanoporous Carbons: Small-Angle Scattering Analysis of Capillary Rise.
Publication date :
01 October 2024
Journal title :
Langmuir
ISSN :
0743-7463
eISSN :
1520-5827
Publisher :
American Chemical Society, United States
Volume :
40
Issue :
39
Pages :
20604 - 20615
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ULiège - Université de Liège
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Funding text :
C.J.G. is grateful to the Funds for Scientific Research (F.R.S.-FNRS, Belgium) for a research associate position and for supporting this research through grant PDR T.0100.22. A.F.L. thanks the University of Lie\u0300ge (Fonds Spe\u0301ciaux pour la Recherche FSR) and the Fonds de Bay for their financial support.
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