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The pattern formation of electropolymerized polypyrrole was studied in bulk-solution and thin-layer-solution cells with and without a magnetic field. A diffusion-limited aggregation pattern was observed in the bulk-solution cell in the absence of a magnetic field. The growth instability was found to be suppressed by thinning the solution and the application of the magnetic field.
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Mogi et al. (1996) studied this question.
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