title: Design of Hierarchical Surfaces for Tuning Wetting Characteristics.
abstract: 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.
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and The Barcelona Institute of Science and Technology, UAB Campus, 08193 Bellaterra, Barcelona, Spain.
authors.forename: Ariadna
authors.identifier: http://orcid.org/0000-0001-7559-2037
authors.initials: A
authors.lastname: Fernández
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and The Barcelona Institute of Science and Technology, UAB Campus, 08193 Bellaterra, Barcelona, Spain.
authors.forename: Achille
authors.initials: A
authors.lastname: Francone
authors.affiliation: NIL Technology ApS, Diplomvej 381, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Lasse H
authors.initials: LH
authors.lastname: Thamdrup
authors.affiliation: NIL Technology ApS, Diplomvej 381, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Alicia
authors.initials: A
authors.lastname: Johansson
authors.affiliation: NIL Technology ApS, Diplomvej 381, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Brian
authors.initials: B
authors.lastname: Bilenberg
authors.affiliation: NIL Technology ApS, Diplomvej 381, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Theodor
authors.initials: T
authors.lastname: Nielsen
authors.affiliation: Karlsruhe Institute of Technology (KIT) , D-76344 Eggenstein Leopoldshafen, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Guttmann
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and The Barcelona Institute of Science and Technology, UAB Campus, 08193 Bellaterra, Barcelona, Spain.|ICREA, Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain.
authors.forename: Clivia M
authors.identifier: http://orcid.org/0000-0001-9986-2716
authors.initials: CM
authors.lastname: Sotomayor Torres
authors.affiliation: Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and The Barcelona Institute of Science and Technology, UAB Campus, 08193 Bellaterra, Barcelona, Spain.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Kehagias
keywords: capillary pressure; contact angle; water droplets; wetting