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Design of Hierarchical Surfaces for Tuning Wetting Characteristics

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

Abstract (englisch):
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.

Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1021/acsami.6b13615
ISSN: 1944-8244, 1944-8252
KITopen ID: 1000067836
HGF-Programm 43.22.01; LK 01
Erschienen in ACS applied materials & interfaces
Band 9
Heft 8
Seiten 7701–7709
Bemerkung zur Veröffentlichung
Schlagworte capillary pressure; contact angle; water droplets; wetting
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