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Appl. Sci. 2016, 6(5), 152;

Superhydrophobic Surfaces Created by Elastic Instability of PDMS

Laboratoire Interfaces et Fluides Complexes, CIRMAP, Université de Mons—UMONS, 20 Place du Parc, B-7000 Mons, Belgium
Environmental Engineering and Natural Resources, Faculty of Agronomy, Lebanese University, Dekouaneh 1203, Lebanon
Author to whom correspondence should be addressed.
Academic Editor: Francisco José Galindo Rosales
Received: 18 February 2016 / Revised: 31 March 2016 / Accepted: 6 May 2016 / Published: 16 May 2016
(This article belongs to the Special Issue Applications of Complex Fluids)
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Lotus flowers, rose petals, some plant leaves and insects have a naturally super-hydrophobic surface. In fact, the surface of a Lotus leaf is covered by micro and nano structures mixed with wax, which makes its surface superhydrophobic. In microfluidics, superhydrophobicity is an important factor in the rheometers on a chip. It is also sought in other complex fluids applications like the self-cleaning and the antibacterial materials. The wettability of the surface of solid support can be modified by altering its chemical composition. This means functionalizing the interface molecules to different chemical properties, and/or forming a thin film on the surface. We can also influence its texturing by changing its roughness. Despite considerable efforts during the last decade, superhydrophobic surfaces usually involve, among others, microfabrication processes, such as photolithography technique. In this study, we propose an original and simple method to create superhydrophobic surfaces by controlling elastic instability of poly-dimethylsiloxane (PDMS) films. Indeed, we demonstrate that the self-organization of wrinkles on top of non-wettable polymer surfaces leads to surperhydrophobic surfaces with contact angles exceeding 150°. We studied the transition Wenzel-Cassie, which indicated that the passage of morphology drops “impaled” to a type of morphology “fakir” were the strongest topographies. View Full-Text
Keywords: superhydrophobic surfaces; wetting; microstructures; wrinkles and elastomers superhydrophobic surfaces; wetting; microstructures; wrinkles and elastomers

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Sabbah, A.; Youssef, A.; Damman, P. Superhydrophobic Surfaces Created by Elastic Instability of PDMS. Appl. Sci. 2016, 6, 152.

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