Abstract
We have investigated by adsorption isotherms and neutron diffraction measurements, respectively the thermodynamic and structural properties of water physisorbed film on MgO (100) powder. Thanks to a high temperature thermal treatment, under vacuum, our MgO powder samples are characterized by a highly homogeneous (100) MgO surface. We have determined the structure of the (2D) water film physisorbed on such an ionic surface. This one is a commensurate P(2×3) structure which is very similar to the (110) planes of ice-VII. Recall that ice VII, which is stable at very high pressure, is characterized by a quite large density (d = 1.6).
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Acknowledgments
The authors greatly acknowledge I. Mirebeau, responsible of the G6-1 diffractometer from the Léon Brillouin Laboratoire (C.E.A. Saclay, France) and H.J. Lauter, in charge of the D1B diffractometer, from the Laüe Langevin Institute (Grenoble, France) for their experimental assistance and fruitful scientific discussions.
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Coulomb, J.P., Demirdjian, B., Ferry, D. et al. Thermodynamic and structural properties of water adsorbed film on MgO (100) ionic surface. Adsorption 19, 861–867 (2013). https://doi.org/10.1007/s10450-013-9538-z
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DOI: https://doi.org/10.1007/s10450-013-9538-z