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Title Wetting resistance at its topographical limit - The benefit of mushroom and serif T structures
Date 07.01.2013
Number 35482
Abstract Springtails (Collembola) are wingless arthropods adapted to cutaneous respiration in temporarily rain-flooded habitats. They immediately form a plastron, protecting them against suffocation upon immersion into water and even low-surface-tension liquids such as alkanes. Recent experimental studies revealed a high-pressure resistance of such plastrons against collapse. In this work, skin sections of Orthonychiurus stachianus are studied by transmission electron microscopy. The micrographs reveal cavity side-wall profiles with characteristic overhangs. These were fitted by polynomials to allow access for analytical and numerical calculations of the breakthrough pressure, that is, the barrier against plastron collapse. Furthermore, model profiles with well-defined geometries were used to set the obtained results into context and to develop a general design principle for the most robust surface structures. Our results indicate the decisive role of the sectional profile of overhanging structures to form a robust heterogeneous wetting state for low-surface-tension liquids that enables the omniphobicity. Furthermore, the design principles of mushroom and serif T structures pave the way for omniphobic surfaces with a high-pressure resistance irrespective of solid surface chemistry.
Publisher Langmuir
Identifier 8
Citation Langmuir 29 (2013) 1100-1112
DOI https://doi.org/10.1021/la304179b
Authors Hensel, R. ; Helbig, R. ; Aland, S. ; Braun, H.-G. ; Voigt, A. ; Neinhuis, C. ; Werner, C.
Tags superhydrophobic surfaces hierarchical structures hydrophilic materials interface stability micro roughness dynamics bubble flows

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