We present a study of finger instability observed in a propagating front resulting from dewetting of a thin water film on a mica substrate. The phenomenon results from a longitudinal instability in a thick cylindrical rim along the front, whose unusual properties are determined by domination of long-range van der Waals interaction between the film and the substrate over the effect of curvature. The interpretation is borne out by quantitative measurements and supported by computer simulations.
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Leizerson et al. (2003) studied this question.
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