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Related Experiment Videos

Complex surface dynamics during anodic dissolution of Ni.

A G Muñoz1, M E Vela, R C Salvarezza

  • 1Institute of Thin Films and Interfaces (ISG 3), Research Centre Juelich, D-52425 Juelich, Germany. a.g.munoz@fz-juelich.de

Langmuir : the ACS Journal of Surfaces and Colloids
|September 21, 2005
PubMed
Summary

Surface roughness in dissolving nickel (Ni) continuously increases, forming grooves and mounds. Different scaling behaviors were observed at various surface scales, influenced by solution additives like nitrite.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Physics

Background:

  • Understanding surface evolution during material dissolution is crucial for controlling material properties.
  • Anodic dissolution of metals like nickel (Ni) can lead to complex surface morphology changes.
  • Dynamic scaling theories provide a framework for analyzing the time and spatial evolution of rough surfaces.

Purpose of the Study:

  • To investigate the evolution of surface roughness during the anodic dissolution of polycrystalline Ni.
  • To characterize the time and spatial scaling behavior of the evolving Ni surface.
  • To understand the influence of solution additives, such as nitrite, on the dissolution process.

Main Methods:

  • Ex situ Atomic Force Microscopy (AFM) was used to image surface topography at different dissolution stages.

Related Experiment Videos

  • Analysis of interface width and power spectral density was performed to characterize scaling behavior.
  • Dynamic scaling theories were applied to interpret the observed surface evolution.

    • Main Results:

    • Surface roughness (W) showed unstable growth (W ~ t^beta, beta > 0.5) without saturation, forming grooves and mounds.
    • Two distinct scaling regimes were identified: smooth walls (alpha ~ 1) for scales smaller than mound dimensions (l_c) and anomalous scaling (alpha_loc < 1) for larger scales.
    • The addition of nitrite altered the scaling behavior, indicating changes in surface chemistry during dissolution.

    Conclusions:

    • The anodic dissolution of Ni is an unstable process governed by the formation of grooves and mounds.
    • Surface morphology exhibits distinct spatial scaling behaviors dependent on the scale relative to mound dimensions.
    • Dissolution rates of crystal orientations and adatom surface diffusion are key physical processes driving interface dynamics, with nitrite modifying these conditions.