Abstract
Water doped with 10−2 mol of KOH was cooled to temperatures at which most of the solution freezes to form hexagonal ice. Using proton and deuteron spin–lattice relaxometry as well as static field gradient diffusometry, it was found that a liquid-like phase coexists with the crystal down to below 200 K. The ionic dopants are expelled from the crystalline phase and form a KOH-enriched aqueous solution probably in the form of inclusions within the ice crystal. Its self-diffusion coefficient is only slightly smaller than that of nominally pure water. Motional correlation times were determined on the basis of spin–lattice relaxation times and compared with previous electrical conductivity and calorimetry results.
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Notes
This slight slow-down of the diffusion of the liquid-like component with respect to that of nominally pure water possibly arises from the hydration of the ions which are additionally present in the doped samples.
Obstruction effects arise if the space in which a particle can diffuse is partially blocked, as e.g., in porous media.
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Acknowledgments
We thank Helge Nelson for interesting discussions. Support of this project by the Deutsche Forschungsgemeinschaft under grant no. BO1301/7 is gratefully acknowledged.
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Dedicated to Prof. Dr. Hans Martin Vieth on the occasion of his 70th birthday.
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Schildmann, S., Schöler, A., Nowaczyk, A. et al. Salty Water in KOH-Doped Hexagonal Ice: a Proton and Deuteron NMR Study. Appl Magn Reson 44, 203–215 (2013). https://doi.org/10.1007/s00723-012-0414-x
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DOI: https://doi.org/10.1007/s00723-012-0414-x