Water-Based Peeling of Thin Hydrophobic Films

Sepideh Khodaparast, François Boulogne, Christophe Poulard, Howard A. Stone

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Inks of permanent markers and waterproof cosmetics create elastic thin films upon application on a surface. Such adhesive materials are deliberately designed to exhibit water-repellent behavior. Therefore, patterns made up of these inks become resistant to moisture and cannot be cleaned by water after drying. However, we show that sufficiently slow dipping of such elastic films, which are adhered to a substrate, into a bath of pure water allows for complete removal of the hydrophobic coatings. Upon dipping, the air-water interface in the bath forms a contact line on the substrate, which exerts a capillary-induced peeling force at the edge of the hydrophobic thin film. We highlight that this capillary peeling process is more effective at lower velocities of the air-liquid interface and lower viscosities. Capillary peeling not only removes such thin films from the substrate but also transfers them flawlessly onto the air-water interface.

Original languageEnglish (US)
Article number154502
JournalPhysical review letters
Volume119
Issue number15
DOIs
StatePublished - Oct 13 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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