title: Giant Osmotic Pressure in the Forced Wetting of Hydrophobic Nanopores.
abstract: The forced intrusion of water in hydrophobic nanoporous pulverulent material is of interest for quick storage of energy. With nanometric pores the energy storage capacity is controlled by interfacial phenomena. With subnanometric pores, we demonstrate that a breakdown occurs with the emergence of molecular exclusion as a leading contribution. This bulk exclusion effect leads to an osmotic contribution to the pressure that can reach levels never previously sustained. We illustrate, on various electrolytes and different microporous materials, that a simple osmotic pressure law accounts quantitatively for the enhancement of the intrusion and extrusion pressures governing the forced wetting and spontaneous drying of the nanopores. Using electrolyte solutions, energy storage and power capacities can be widely enhanced.
authors.affiliation: MATEIS, INSA-Lyon, CNRS UMR 5510, 69621 Villeurbanne, France.
authors.forename: Millan
authors.initials: M
authors.lastname: Michelin-Jamois
authors.affiliation: Université Grenoble Alpes, LIPHY, F-38000 Grenoble, France.
authors.forename: Cyril
authors.initials: C
authors.lastname: Picard
authors.affiliation: MATEIS, INSA-Lyon, CNRS UMR 5510, 69621 Villeurbanne, France.
authors.forename: Gérard
authors.initials: G
authors.lastname: Vigier
authors.affiliation: Université Grenoble Alpes, LIPHY, F-38000 Grenoble, France.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Charlaix
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D018021:Lithium Chloride / Q000737:chemistry; D008956:Models, Chemical; D058608:Nanopores; D009997:Osmotic Pressure; D012965:Sodium Chloride / Q000737:chemistry; D014867:Water / Q000737:chemistry; D017155:Wettability; D017641:Zeolites / Q000737:chemistry
chemical_list: D014867:Water; D017641:Zeolites; D012965:Sodium Chloride; D018021:Lithium Chloride