Premium
Direct Volumetric Measurement of Gas Oversolubility in Nanoliquids: Beyond Henry’s Law
Author(s) -
PeraTitus Marc,
ElChahal Rayan,
Rakotovao Volainiana,
Daniel Cécile,
Miachon Sylvain,
Dalmon JeanAlain
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900058
Subject(s) - solubility , henry's law , bar (unit) , mesoporous material , chemistry , porosity , hexane , analytical chemistry (journal) , chemical engineering , thermodynamics , materials science , organic chemistry , catalysis , physics , meteorology , engineering
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 (CHCl 3 , CCl 4 , n ‐hexane, ethanol, and water) when confined in the cavities of mesoporous solids (γ‐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 H 2 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.