Etching of random solids: hardening dynamics and self-organized fractality

Details Etching of random solids: hardening dynamics and self-organized fractality Etching of random solids: hardening dynamics and self-organized fractality

2000-11-08

arxiv.org/abs/cond-mat/0011140v1

Physics

Condensed Matter

Statistical Mechanics

Latex, aipproc, 6 pages, 3 figures, Proceedings of 6th Granada Seminar on Computational Physics

Scientific paper

10.1063/1.1386822

When a finite volume of an etching solution comes in contact with a disordered solid, a complex dynamics of the solid-solution interface develops. Since only the weak parts are corroded, the solid surface hardens progressively. If the etchant is consumed in the chemical reaction, the corrosion dynamics slows down and stops spontaneously leaving a fractal solid surface, which reveals the latent percolation criticality hidden in any random system. Here we introduce and study, both analytically and numerically, a simple model for this phenomenon. In this way we obtain a detailed description of the process in terms of percolation theory. In particular we explain the mechanism of hardening of the surface and connect it to Gradient Percolation.

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