Reversible switching between superhydrophobic states on a hierarchically structured surface

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2012
Major/Subject
Mcode
Degree programme
Language
en
Pages
10210-10213
Series
Proceedings of the National Academy of Sciences, Volume 109, Issue 26
Abstract
Nature offers exciting examples for functional wetting properties based on superhydrophobicity, such as the self-cleaning surfaces on plant leaves and trapped air on immersed insect surfaces allowing underwater breathing. They inspire biomimetic approaches in science and technology. Superhydrophobicity relies on the Cassie wetting state where air is trapped within the surface topography. Pressure can trigger an irreversible transition from the Cassie state to the Wenzel state with no trapped air—this transition is usually detrimental for nonwetting functionality and is to be avoided. Here we present a new type of reversible, localized and instantaneous transition between two Cassie wetting states, enabled by two-level (dual-scale) topography of a superhydrophobic surface, that allows writing, erasing, rewriting and storing of optically displayed information in plastrons related to different length scales.
Description
Keywords
micropillars, silicone nanofilaments, optical data storage, bistable, two-tier
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Citation
Verho, Tuukka & Korhonen, Juuso T. & Sainiemi, Lauri & Jokinen, Ville & Bower, Chris & Franze, Kristian & Franssila, Sami & Andrew, Pierce & Ikkala, Olli & Ras, Robin H. A.. 2012. Reversible switching between superhydrophobic states on a hierarchically structured surface. Proceedings of the National Academy of Sciences. Volume 109, Issue 26. P. 10210-10213. ISSN 1091-6490 (printed). DOI: 10.1073/pnas.1204328109.