Design of Hierarchical Surfaces for Tuning Wetting Characteristics

Ariadna Fernández, Achille Francone, Lasse H. Thamdrup, Alicia Johansson, Brian Bilenberg, Theodor Nielsen, Markus Guttmann, Clivia M. Sotomayor Torres, Nikolaos Kehagias

    Research output: Contribution to journalArticleResearchpeer-review

    26 Citations (Scopus)

    Abstract

    © 2017 American Chemical Society. Patterned surfaces with tunable wetting properties are described. A hybrid hierarchical surface realized by combining two different materials exhibits different wetting states, depending on the speed of impingement of the water droplets. Both "lotus" (high contact angle and low adhesion) and "petal" (high contact angle and high adhesion) states were observed on the same surface without the need of any modification of the surface. The great difference between the capillary pressures exerted by the microstructures and nanostructures was the key factor that allowed us to tailor effectively the adhesiveness of the water droplets. Having a low capillary pressure for the microstructures and a high capillary pressure for the nanostructures, we allow to the surface the possibility of being in a lotus state or in a petal state.
    Original languageEnglish
    Pages (from-to)7701-7709
    JournalACS Applied Materials and Interfaces
    Volume9
    Issue number8
    DOIs
    Publication statusPublished - 1 Mar 2017

    Keywords

    • capillary pressure
    • contact angle
    • water droplets
    • wetting

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