Designer Patterns: Flexible Control of Precipitation through Electric Currents

Details Designer Patterns: Flexible Control of Precipitation through Electric Currents Designer Patterns: Flexible Control of Precipitation through Electric Currents

2008-02-19

arxiv.org/abs/0802.2690v1

Phys. Rev. Lett. 101, 075701 (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.101.075701

Precipitation patterns generated by A^{+}+B^{-} --> C type reaction-diffusion processes are studied. It is shown both theoretically and experimentally that the patterns can be controlled by an appropriately designed, time-dependent electric current in the system. We describe examples of current dynamics yielding periodic bands of prescribed wavelength, as well as more complicated structures. The pattern control is demonstrated experimentally on the reaction-diffusion-precipitation process 2AgNO_3+K_2Cr_2O_7 --> Ag_2Cr_2O_7+2KNO_3 taking place in a gel.

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