Thermodynamic properties of interfacial water from its infrared signatures

Abstract : Water liquid trapped in quartz micro-cavities is probed by infrared micro-spectroscopy to explore the influence of the solid/liquid and liquid/air interfaces on water thermodynamics. The sample is infraredly mapped with a 3x3 µm micro-beam allowed by the brilliance of synchrotron radiation source (SOLEIL, SMIS beamline) at 2.5 µm xy interval. It appears that the intramolecular OH-stretching band is changing as a function of its proximity to the interfaces. To refine these variations, the band is decomposed into Gaussian components, evidencing that water is interface-printed even at micrometric distance to the wall and/or to the bubble with the closest layer to the interface marked by a dangling-OH effect. Then, these vibrational changes are converted into Gibbs free energy, which range from 35 J.mol-1 4.5 µm away from the interface, to 1 kJ.mol-1 at about 1 µm.
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  • HAL Id : insu-00877516, version 1

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Isabelle Bergonzi, Lionel Mercury, Frédéric Jamme. Thermodynamic properties of interfacial water from its infrared signatures. 16th International Conference on the Properties of Water and Steam, Sep 2013, Londres, United Kingdom. 8 p. ⟨insu-00877516⟩

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