Illustration from Scientific Research

Concept image depicting the experimental setup: a gel film containing gel reagent is placed in an empty container, into which immersion reagent (IR) is pumped with a syringe pump, steadily immersing the thin film. Preceding the liquid-gel contact line (depicted in blue) at the reaction front (depicted in red) the reaction between the immersion and gel reagent produces a line pattern of precipitate perpendicular to the immersion direction. At constant immersion speed a balance between the immersion speedvand upward diffusion is reached, resulting in highly uniform line distances (d).

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