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Article Dans Une Revue ChemPhysChem Année : 2009

Direct Volumetric Measurement of Gas Oversolubility in Nanoliquids: Beyond Henry's Law

Résumé

The properties of condensed matter are strongly affected by confinement and size effects at the nanoscale. Herein, we measured by microvolumetry the increased solubility of H-2 in a series of solvents (CHCl3, CCl4, n-hexane, ethanol, and water) when confined in the cavities of mesoporous solids (gamma-alumina, silica, and MCM-41). Gas/liquid solubilities are enhanced by up to 15 times over the corresponding bulk values for nanoliquid sizes smaller than 15 nm as long as gas/liquid interfaces are mesoconfined in a porous network. Although Henry's law constant apparently no longer applies under these confinement, the concentration of dissolved H2 Still increases linearly with increasing pressure in the range 1-5 bar. We discuss the role and main implications of surface excess concentrations at mesoconfined gas/liquid interfaces in enhancing gas solubility.

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Dates et versions

hal-00431079 , version 1 (10-11-2009)

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M. Pera-Titus, R. El-Chahal, V. Rakotovao, C. Daniel, S. Miachon, et al.. Direct Volumetric Measurement of Gas Oversolubility in Nanoliquids: Beyond Henry's Law. ChemPhysChem, 2009, 10 (12), pp.2082-2089. ⟨10.1002/cphc.200900058⟩. ⟨hal-00431079⟩
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