Design of robust superhydrophobic surfaces

dc.contributorAalto Universityen
dc.contributor.authorWang, Dehuien_US
dc.contributor.authorSun, Qiangqiangen_US
dc.contributor.authorHokkanen, M.J.en_US
dc.contributor.authorZhang, Chenglinen_US
dc.contributor.authorLin, Fan-Yenen_US
dc.contributor.authorLiu, Qiangen_US
dc.contributor.authorZhu, Shun-Pengen_US
dc.contributor.authorZhou, Tianfengen_US
dc.contributor.authorChang, Qingen_US
dc.contributor.authorHe, Boen_US
dc.contributor.authorZhou, Quanen_US
dc.contributor.authorChen, Longquanen_US
dc.contributor.authorWang, Zuankaien_US
dc.contributor.authorRas, Robinen_US
dc.contributor.authorXu, Dengen_US
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.departmentDepartment of Electrical Engineering and Automationen
dc.contributor.departmentDepartment of Bioproducts and Biosystemsen
dc.contributor.groupauthorSoft Matter and Wettingen
dc.contributor.groupauthorRobotic Instrumentsen
dc.contributor.organizationUniversity of Electronic Science and Technology of Chinaen_US
dc.contributor.organizationBruker Nano Surfaces Divisionen_US
dc.contributor.organizationBeijing Institute of Technologyen_US
dc.contributor.organizationHanergy Chengdu R&D Centeren_US
dc.contributor.organizationCity University of Hong Kongen_US
dc.description| openaire: EC/H2020/725513/EU//SuperRepel
dc.description.abstractThe ability of superhydrophobic surfaces to stay dry, self-clean and avoid biofouling is attractive for applications in biotechnology, medicine and heat transfer 1–10. Water droplets that contact these surfaces must have large apparent contact angles (greater than 150 degrees) and small roll-off angles (less than 10 degrees). This can be realized for surfaces that have low-surface-energy chemistry and micro- or nanoscale surface roughness, minimizing contact between the liquid and the solid surface 11–17. However, rough surfaces—for which only a small fraction of the overall area is in contact with the liquid—experience high local pressures under mechanical load, making them fragile and highly susceptible to abrasion 18. Additionally, abrasion exposes underlying materials and may change the local nature of the surface from hydrophobic to hydrophilic 19, resulting in the pinning of water droplets to the surface. It has therefore been assumed that mechanical robustness and water repellency are mutually exclusive surface properties. Here we show that robust superhydrophobicity can be realized by structuring surfaces at two different length scales, with a nanostructure design to provide water repellency and a microstructure design to provide durability. The microstructure is an interconnected surface frame containing ‘pockets’ that house highly water-repellent and mechanically fragile nanostructures. This surface frame acts as ‘armour’, preventing the removal of the nanostructures by abradants that are larger than the frame size. We apply this strategy to various substrates—including silicon, ceramic, metal and transparent glass—and show that the water repellency of the resulting superhydrophobic surfaces is preserved even after abrasion by sandpaper and by a sharp steel blade. We suggest that this transparent, mechanically robust, self-cleaning glass could help to negate the dust-contamination issue that leads to a loss of efficiency in solar cells. Our design strategy could also guide the development of other materials that need to retain effective self-cleaning, anti-fouling or heat-transfer abilities in harsh operating environments.en
dc.description.versionPeer revieweden
dc.identifier.citationWang, D, Sun, Q, Hokkanen, M J, Zhang, C, Lin, F-Y, Liu, Q, Zhu, S-P, Zhou, T, Chang, Q, He, B, Zhou, Q, Chen, L, Wang, Z, Ras, R & Xu, D 2020, ' Design of robust superhydrophobic surfaces ', Nature, vol. 582, no. 7810, pp. 55–59 .
dc.identifier.otherPURE UUID: 3480ec9b-8bb3-45dc-abd3-2ee5bf299a31en_US
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dc.publisherNature Publishing Group
dc.relation.ispartofseriesVolume 582en
dc.titleDesign of robust superhydrophobic surfacesen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi