Abstract
WHEN a temperature gradient is applied to a homogeneous solution of an electrolyte, there is a tendency for a concentration gradient to be established (Soret effect). The thermal diffusion potential associated with the temperature gradient should change during the establishment of the Soret equilibrium. For a cell of the type: the change in e.m.f. during the establishment of this equilibrium can be calculated theoretically1ā3. In the simplest case2, where the solution contains a uni-univalent salt obeying the ideal law, the change in e.m.f., Īt, for a cell containing electrodes reversible to anions is and, for one with cation-reversible electrodes, where an increase in concentration at the hot electrode is taken as positive, and n + and n ā represent the transference numbers of the cation and anion respectively.
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References
de Groot, J. Phys. et le Rad., 8, 129 (1947).
Tyrrell and Hollis, Trans. Farad. Soc., 48, 893 (1952).
Haase, Trans. Farad. Soc., 49, 724 (1953).
Colledge, thesis, University of Sheffield (1953).
cf. Tanner, Trans. Farad. Soc., 23, 75 (1927); 49, 611 (1953).
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TYRRELL, H., COLLEDGE, R. Thermal Diffusion Potentials and the Soret Effect. Nature 173, 264ā265 (1954). https://doi.org/10.1038/173264a0
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DOI: https://doi.org/10.1038/173264a0
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