Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Focus: Wetting on smooth and rough surfaces: From spreading to superhydrophobicity
CPP 30.6: Poster
Wednesday, March 13, 2013, 16:30–18:30, Poster C
The Salvinia Effect: Superhydrophobic Surfaces with Hydrophilic Pins for Air Retention Under Water — •Daniel Gandyra1, Birte Böhnlein1, Matthias Mail1, 2, Aaron Kobler1, Anke Kaltenmeier1, Matthias Barczewski1, Stefan Walheim1, Kerstin Koch4, Jan-Erik Melskotte3, Martin Brede3, Alfred Leder3, Wilhelm Barthlott2, and Thomas Schimmel1 — 1Institute of Applied Physics, Institute of Nanotechnology, and Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology — 2Nees Institute for Biodiversity of Plants, University of Bonn — 3Chair of Fluid Mechanics, University of Rostock — 4Biology and Nanobiology, Hochschule Rhein-Waal
Air-retaining surfaces are of great technological, economic and ecological interest, e.g., for low-friction fluid transport and drag reduction in ship coatings. An innovative mechanism for long-term air retention under water is found in the sophisticated surface design of water fern Salvinia molesta. Its floating leaves are evenly covered with complex hydrophobic hairs retaining a layer of air when submerged under water. The terminal cells of the hairs, however, are hydrophilic. These hydrophilic patches at the end of the hairs pin the air-water interface, thus preventing the loss of air by preventing the formation and detachment of air bubbles [1]. This "Salvinia Effect" opens intriguing perspectives for developing artificial, biomimetic surfaces with long-term air retention under water. [1] W. Barthlott, T. Schimmel et al.: The Salvinia Paradox. Advanced Materials 22, 2325-2328, 2010.