Wien effect

Wien effect

The Wien effect is the experimentally-observed increase in ionic mobility or conductivity of electrolytes at very high gradient of electrical potential.[1] A theoretical explanation has been proposed by Lars Onsager.[2]

A related phenomenon is known as the Second Wien Effect or the dissociation field effect, and it involves increased dissociation constants of weak acids at high electrical gradients.[3] The dissociation of weak chemical bases is unaffected.

The effects are important at very high electrical gradients (108 - 109 V/m), like those observed in electrical double layers at interfaces or at the surfaces of electrodes in electrochemistry.

More generally, the electric field effect (directly, through space rather than through chemical bonds) on chemical behaviour of systems (e.g., on reaction rates) is known as the field effect or the direct effect. [4]

The terms are named after Max Wien.[5][6]

See also

References

  1. ^ "McGraw-Hill Dictionary of Scientific & Technical Terms", The McGraw-Hill, 2003.
  2. ^ Onsager, Lars; Shoon Kyung Kim (1957). "Wien Effect in Simple Strong Electrolytes". J. Phys. Chem. 61 (2): 198–215. doi:10.1021/j150548a015. 
  3. ^ Carl H. Hamann, Andrew Hamnett, Wolf Vielstich "Electrochemistry", 2nd edtion, Wiley-VCH (Google books)
  4. ^ IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook. Entry:field effect (DOI of this term: doi:10.1351/goldbook.F02358).
  5. ^ Karl Willy Wagner, "Max Wien zum 70. Geburtstag" (On the 70th birthday of Max Wien), Naturwissenschaften, Volume 25, Number 5, 65-67, DOI: 10.1007/BF01493271 (link to pdf) (in German).
  6. ^ Max Wien: (1) Ann. Physik. 85, 795 (1928); (2) Phys. Z. 29, 751 (1928); (3) Ann. Physik. 1, 400 (1929); (4) Phys. Z. 32, 545 (1931); (5) J. Malsch and M. Wien, Ann. Physik. 83, 305 (1927).

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