Design of robust superhydrophobic surfaces

Dehui Wang, Qiangqiang Sun, M.J. Hokkanen, Chenglin Zhang, Fan-Yen Lin, Qiang Liu, Shun-Peng Zhu, Tianfeng Zhou, Qing Chang, Bo He, Quan Zhou, Longquan Chen, Zuankai Wang, Robin Ras, Xu Deng

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

11 Sitaatiot (Scopus)

Abstrakti

The ability of superhydrophobic surfaces to stay dry, self-clean and avoid biofouling is attractive for applications in biotechnology, medicine and heat transfer. 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. 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. Additionally, abrasion exposes underlying materials and may change the local nature of the surface from hydrophobic to hydrophilic, 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.
AlkuperäiskieliEnglanti
Sivut55–59
JulkaisuNature
Vuosikerta582
DOI - pysyväislinkit
TilaJulkaistu - 2020
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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  • Projektit

    Scanning Droplet Adhesion Microscope

    Valiauga, P., Vieira, A., Seon, J., Zhou, Q. & Najafi Haeri, S.

    01/01/201831/12/2020

    Projekti: Business Finland: New business from research ideas (TUTLI)

    Lehtileikkeet

    Microscale armor toughens super water-repellent surfaces

    Robin Ras

    05/06/2020

    1 kohde/ Medianäkyvyys

    Lehdistö/media: Esiintyminen mediassa

    Microscale armor toughens super water-repellant surfaces

    Robin Ras

    04/06/2020

    1 kohde/ Medianäkyvyys

    Lehdistö/media: Esiintyminen mediassa

    Super water-repellent materials are now durable enough for the real world

    Robin Ras

    03/06/2020

    4 kohdetta/ Medianäkyvyys

    Lehdistö/media: Esiintyminen mediassa

    Siteeraa tätä

    Wang, 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., & Deng, X. (2020). Design of robust superhydrophobic surfaces. Nature, 582, 55–59. https://doi.org/10.1038/s41586-020-2331-8