| Abstract
| - The dewetting of liquid filaments in linear grooves of a triangular cross section is studied experimentally andtheoretically. Homogeneous filaments of glassy polystyrene (PS) are prepared in triangular grooves in a nonequilibriumstate. At elevated temperatures, the molten PS restores its material contact angle with the substrate. Liquid filamentswith a convex liquid−vapor interface decay into isolated droplets with a characteristic spacing depending on the wedgegeometry, wettability, and filament width. This instability is driven by the interplay of local filament width and Laplacepressure and constitutes a wide class of 1D instabilities that also include the Rayleigh−Plateau instability as a specialcase. Our results show an accurately exponential buildup of the instability, suggesting that fluctuations have a minorinfluence in our system.
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