Dewetting of liquid filaments in wedge-shaped grooves

Krishnacharya Khare, Martin Brinkmann, Bruce M. Law, Evgeny L. Gurevich, Stephan Herminghaus, Ralf Seemann

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22 Citations (Scopus)

Abstract

The dewetting of liquid filaments in linear grooves of a triangular cross section is studied experimentally and theoretically. Homogeneous filaments of glassy polystyrene (PS) are prepared in triangular grooves in a nonequilibrium state. At elevated temperatures, the molten PS restores its material contact angle with the substrate. Liquid filaments with a convex liquid−vapor interface decay into isolated droplets with a characteristic spacing depending on the wedge geometry, wettability, and filament width. This instability is driven by the interplay of local filament width and Laplace pressure and constitutes a wide class of 1D instabilities that also include the Rayleigh−Plateau instability as a special case. Our results show an accurately exponential buildup of the instability, suggesting that fluctuations have a minor influence in our system.
Original languageEnglish
Pages (from-to)12138-12141
JournalLangmuir
Volume23
Issue number24
Early online date26 Oct 2007
DOIs
Publication statusPublished - 1 Nov 2007
Externally publishedYes

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