The Zipping-wetting Dynamics at the Breakdown of Superhydrophobicity

Mauro Sbragaglia, Christophe Pirat, Alisia M. Peters, Peichun Amy Tsai, Bram M. Borkent, Rob G.H. Lammertink, Matthias Wessling, Detlef Lohse

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Abstract

Under some conditions water droplets can completely wet micro-structured superhydrophobic surfaces. The dynamics of this rapid process is investigated with ultra-high-speed imaging. Depending on the scales of the micro-structure, the wetting fronts propagate smoothly and circularly or – more interestingly – in a stepwise manner for a smaller periodicity of the microstructure. The latter phenomenon leads to a growing square-shaped wetted area: liquid laterally enters a new row on a slow timescale of milliseconds, once it happens the row then fills itself towards the sides in microseconds (“zipping”).
Original languageEnglish
Number of pages2
Publication statusPublished - 24 Aug 2008
EventXXII International Congress of Theoretical and Applied Mechanics, ICTAM 2008 - Adelaide, Australia
Duration: 24 Aug 200829 Aug 2008
Conference number: 22

Conference

ConferenceXXII International Congress of Theoretical and Applied Mechanics, ICTAM 2008
Abbreviated titleICTAM
CountryAustralia
CityAdelaide
Period24/08/0829/08/08

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