Coarsening of Precipitation Patterns in a Moving Reaction-Diffusion Front

Details Coarsening of Precipitation Patterns in a Moving Reaction-Diffusion Front Coarsening of Precipitation Patterns in a Moving Reaction-Diffusion Front

2009-11-10

arxiv.org/abs/0911.1855v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 7 figures, to appear in Phys. Rev. E

Scientific paper

Precipitation patterns emerging in a 2D moving front are investigated on the example of NaOH diffusing into a gel containing AlCl_3. The time evolution of the precipitate Al(OH)_3 can be observed since the precipitate redissolves in the excess outer electrolyte NaOH and thus it exists only in a narrow, optically accessible region of the reaction front. The patterns display self-similar coarsening with a characteristic length, xi(t), increasing with time t as xi(t) ~ t^(1/2). A theory based on Cahn-Hilliard phase-separation dynamics including dissolution is shown to yield agreement with the experiments.

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