Synthesis of in situ purified iron nanoparticles in an electrochemical and vibrating microreactor: study of ramified branch fragmentation by oscillating bubbles

Iranzo, Audrey; Chauvet, Fabien

doi:10.1007/s10404-019-2211-4

Cited by 3 publications

(2 citation statements)

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“…Many questions remain open especially beyond the dendritic transition, when the branch microstructure is mixed (grain assemblies and dendritic crystals). For example, in the case of copper (as here) and iron ( 11,55 ), why the size of the dendrites is always so low that, on the macro-scale, the pattern remains ramified? While for zinc (and in some extent for silver), very large dendrites are obtained.…”

Section: Discussionmentioning

confidence: 97%

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Crossover between Re-Nucleation and Dendritic Growth in Electrodeposition without Supporting Electrolyte

Kharbachi

Tzedakis²,

Chauvet³

2021

J. Electrochem. Soc.

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This work deals with the formation of dendritic structures by electrodeposition of Cu 2+ and Ag + without supporting electrolyte in Hele-Shaw cells. The transition between the two main patterns, ramified branches and dendrites, is specifically addressed at the scale of branch microstructure using careful SEM observations. Ramified branches, composed only of grain assemblies, are obtained at low current densities because of a re-nucleation process induced by space charge dynamics (Fleury, Nature, 1997). For current densities higher than a given threshold, ramified branches are also formed by re-nucleation but another growth mode, the dendritic growth, is also observed while, at the macro-scale, the pattern remains fractal and isotropic. This shows that 1) pattern transition originates from a morphological transition at microstructure scale and 2) the re-nucleation process enables a freedom in local growth direction allowing the pattern to be fractal at the macro-scale. The onset of the dendritic growth mode, from shape instability of the grains, is considered with Mullins & Sekerka model. This latter disagrees with the observations by predicting that the grains are always unstable. It is proposed that the space charge plays a key role by controlling the shape stability and thus the transition between the two growth modes.

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Section: Discussionmentioning

confidence: 97%

“…For example, in the case of copper (as here) and iron ( [38,39]), why the size of the dendrites is always so low that, on the macroscale, the pattern remains ramified ? While for zinc, very large dendrites are obtained [7].…”

Section: Microstucturementioning

confidence: 99%