Electrochemistry in the presence of convective flow generated by acoustic streaming from a focused ultrasonic source.
Limiting currents for the reduction of hexacyanoferrate-(III), i(lim), in aqueous solutions have been recorded in the presence of convective flow generated by a focused acoustic source with its main axis placed normal to the surface of a circular Au electrode embedded in a coplanar Teflon shroud. The results obtained could be fitted to a formula of the type -i(lim) = a(Uz(ss))b, where Uz(ss) is the axial velocity of the fluid along the center line of the lens evaluated at the focal point using computer simulation routines developed by Kamakura and co-workers (Kamakura, T.; Matsuda, K; Kumamoto, Y.; Breazeale, M. A. J. Acoust. Soc. Am. 1995, 97, 2740-2746). The fit yielded a value of b approximately 0.5 in agreement with that of rotating disk and impinging jet electrodes.
Stefan
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Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA.
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Zanelli
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Scherson
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D000465:Algorithms; D004563:Electrochemistry / Q000379:methods*; D007202:Indicators and Reagents; D016012:Poisson Distribution; D014465:Ultrasonics
D007202:Indicators and Reagents