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Mechanism of Ion Transport in Cooled and Supercooled Water at High Pressure

Published online by Cambridge University Press:  21 February 2011

M. Nakahara ,
N. Takisawa  and
J. Osugi
M. Nakahara
Affiliation:
Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606, Japan
N. Takisawa
Affiliation:
Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606, Japan
J. Osugi
Affiliation:
Department of Chemistry, Faculty of Science, Kyoto University, Kyoto 606, Japan
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Abstract

As predicted by the Hubbard-Onsager continuum dielectric friction theory for ionic mobility in solution, the observed pressure coefficient of the difference ζ between the observed ionic drag coefficient and the Stokes law friction (4πηR), is negative for the small ion Li+ even at low temperatures where the water structure is highly developed. For the large ion Cs+, however, it is positive at any temperature in contrast to the theoretical prediction, its magnitude being larger at lower temperatures and pressures. The anomaly is shown also by the medium-sized ion K+ below room temperature. The passing-through-cavities (PTC) mechanism has been proposed to explain the limitations of the continuum theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 22: Symposium NY – High Pressure in Science and Technology , 1983 , 169
Copyright
Copyright © Materials Research Society 1984

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References

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