Zur Kenntnis der natürlichen Konvektion bei der Elektrolyse: Interferometrische Untersuchungen der Diffusionsschicht I

Abstract

Volumen XXXVII, Fasciculus II (1954) -No. 69-70. 58 3 Destillution des L-( + )-Dialdehyd-hydrats aus Anhydro-L-tagatose-triazol I11 bei 140-150° im Hochvakuum verlief unter Wasserabspaltung. 3,504 mg Subst. gaben 7,507 mg CO, und 1,397 mg H,O 2,907 mg Subst. gaben 0,460 cm3 N, (22O; 718 mm) Die Analysen wurden in unserer mikroanalytischen Abteilung (Leitung W . Munser) ausgefiihrt. Die 1R.-Spektren wurden von Hrn. A . Hubscher auf einem Baird-Spektrographen aufgenommen. Bei der Interpretation der Spektren war uns Hr. Prof. Hs. H . Gunthard behilflich.

The concentration field during transient natural convection between vertical electrodes in a small-aspect-ratio cell

“…Tobias' group conducted a detailed study on the lightdeflection errors related to the interferometric measurement of concentration profiles [26]. The concentration profiles as a function of time within the diffusion layer were studied in [4,27]. Their change at different heights of the electrode was calculated at steady state, based on integral methods of hydrodynamic theory, for the cathodic part [27].…”

“…The early works on two-beam interferometry in electrochemistry were reviewed by Muller [1]. Different interferometers such as Rayleigh [2,3], Jamin [4,5] and Mach-Zehnder [6][7][8] have been used to study the concentration field during electrochemical processes. The ionic mass-transfer rate was first examined by Ibl's group [9] by means of a Jamin interferometer.…”

“…The ionic mass-transfer rate was first examined by Ibl's group [9] by means of a Jamin interferometer. Various kinds of interferometers were used to determine diffusion coefficients [10,11] and to study the mass transport boundary layers in the early time [4][5][6]. Santhanam and O'Brien reviewed the use of laser interferometry to study mass transport in electrodeposition of metals and polymers without [12] and in the presence of magnetic fields [13,14].…”

“…A great deal of work [4][5][6][7][8][9][19][20][21][22][23][24][25][26][27] has been devoted to the interferometric analysis of the concentration profiles developing during the electrolysis of CuSO 4 solution between vertical electrodes. This indeed constitutes a typical problem due to the numerous analytical solutions and scaling predictions available from the analogous problems in heat transfer (two sidewalls (i) either at constant, but different temperatures or (ii) exposed to a constant heat flux).…”

Experimental Demonstration of Diffusion-Limited Dynamics in Electrodeposition

“…Applying phase-shift interferometry for the local determination of the concentration field, we demonstrate that the diffusion equation can accurately describe the mass transport in cells whose gap is less than 50 mm. We also show the correspondence of the time evolution of experimental interfacial depletion profiles along the reacting electrode with the theoretical prediction of a simple diffusion equation.[S0031-9007 (97)03477-7] PACS numbers: 81.15.Pq, 61.43.Hv, 68.35.Rh, 81.10.MxSince the beginning of this century, diffusion-limited interfacial processes have been the object of strong interest among electrochemists and physicists because they can provide sufficiently simple transport equations to enable some theoretical modeling [1][2][3][4]. In particular, the electrodeposition of metals has been the subject of multiple theoretical and experimental studies.…”