Ring Morphology in Interfacial Electrodeposition

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Abstract
Silver electrodeposition at the air/water interface is found to yield a hitherto unreported ring morphology, with silvery, quasi-2D rings alternating with black, 3D-like ones. This is attributed to oscillatory accumulation/detachment cycles of hydrogen at the growing edge of the deposit. With this morphology, the measured morphology diagram closely resembles that of bacterial colony growth, indicating a similarity of the underlying growth mechanism.