INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Numerical and Experimental Studies of Electrochemical Deposition Quasi-Stable Growth
ESTEBAN E. MOCSKOS, GRACIELA GONZALEZ, FERNANDO V. MOLINA,GUILLERMO MARSHALL
JOURNAL OF ELECTROANALYTICAL CHEMISTRY - (Print)
ELSEVIER SCIENCE SA
Año: 2011 vol. 653 p. 27 - 27
Abstract Electrochemical Deposition (ECD) in thin cells in a vertical position relative to gravity (cathode above anode) yields a growth pattern formation with a uniform front. However, detailed analysis of front evolution reveals a complex competi- tion between neighboring branches leading to a locally uctuating growth. We study these uctuations through experiments and theory. Experiments reveal that the uniform dendrite front is due to an acceleration and deceleration of the leading branches, the latter resulting from the building of a stable strati ed ow at their tips. Theory predicts local electrohydrodynamic uctuations near the dendrite tips amid a global stable strati ed ow. Dendrite tips are sur- rounded by arches joining neighboring tips, separating depleted and constant concentration solution zones; the arches shape is the result of electro and gravito convective driven vortex rings. The simulated growth of a single tip exhibits the formation of a mushroom-like shape which is consistent with experimental observations.