We studied precipitation patterns in a Liesegang system under microwave
irradiation in order to investigate metal salt diffusion in an electrolyte gel.
The salt species and microwave irradiation power were varied. Microwave
irradiation induced periodic patterns of precipitation because polar molecules
vibrate and rotate in an electromagnetic field. For example, the number of
patterns increased with the irradiation power. Accordingly, microwave
irradiation nonlinearly accelerated the diffusion of ionic molecules.
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