Ring morphology in interfacial electrodeposition

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. 1997