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Journal articles

Magnetic field influence on mass transport phenomena

Abstract : The oxidation reactions of hexacyanoferrate(H) and hydroquinone in KCl media were studied on disk platinum electrodes using chronoamperometry under a strong magnetic field (1.74 T). The limiting current measured under magnetic field i(B) can be expressed as a function of parameters that control the mass transfer phenomenon by i(B) = KCa D-b d(c) v(e) epsilon(f) B-g n(h). C represents the electroactive species concentration (mol m(-3)), D the diffusion coefficient of the electroactive species (m(2)s(-1)), d the working electrode diameter, v the kinematic viscosity of the electrolyte (cS), epsilon the dielectric constant of the solution, B the magnetic field strength (T), n the number of electrons involved in the redox process and K is a proportionality constant. Contribution of B to the limiting current is well established (g = 1/3), whereas the contribution of D has to be confirmed (b = 1). The aim of this work was to specify the influence of the other parameters for which various results have been published in recent literature. We concluded that i(B) = KC(4/3)Dd(5/3)v(-2/3)epsilon(-7/4)B(1/3)n, quantifying for the first time, to our knowledge, the drastic influence of the electrolyte dielectric constant.
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Contributor : Sophie LEGEAI Connect in order to contact the contributor
Submitted on : Thursday, March 23, 2017 - 4:41:36 PM
Last modification on : Wednesday, December 15, 2021 - 9:57:43 AM

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Sophie Legeai, Michelle Chatelut, Olivier Vittori, Jean-Paul Chopart, Omar Aaboubi. Magnetic field influence on mass transport phenomena. Electrochimica Acta, Elsevier, 2004, 50 (1), pp.51 - 57. ⟨10.1016/j.electacta.2004.07.012⟩. ⟨hal-01494599⟩



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