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Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Poster: Biopolymers and Biomaterials

CPP 9.3: Poster

Monday, March 14, 2011, 17:30–19:30, P2

The Salvinia effect: Measuring the water adhesion on structures of biological air retaining surfaces — •Daniel Gandyra1, Matthias Mail1, Aaron Weis1, Anke Kaltenmaier1, Matthias Barczewski1, Stefan Walheim1, Kerstin Koch4, Martin Brede3, Alfred Leder3, Holger Bohn2, Wilhelm Barthlott2, and Thomas Schimmel11Institute of Applied Physics, Institute of Nanotechnology, and Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology — 2Nees-Institut for Biodiversity of Plants, University of Bonn — 3Lehrstuhl Strömungsmechanik, Fakultät für Maschinenbau und Schiffstechnik, University of Rostock — 4Biologie und Nanobiologie, Hochschule Rhein-Waal

A novel mechanism for long-term air retention under water is found in the sophisticated surface design of the water fern Salvinia. Its floating leaves are evenly covered with complex hydrophobic hairs retaining a layer of air when submerged under water. Surprisingly the terminal cells of the hairs are hydrophilic. These hydrophilic patches stabilize the air layer by pinning the air*water interface [1]. This *Salvinia Effect* provides an innovative concept to develop biomimetic surfaces with long-term air-retention capabilities for under water applications. In order to understand this stabilization effect one has to measure the water adhesion of those structures. We show a novel method to determine the water adhesion on those surfaces.

[1] Barthlott, W.; Schimmel, T. et al.: The Salvinia paradox: superhydrophobic surfaces with hydrophilic pins for air-retention under water. Advanced Materials 22, 2325-2328, 2010.

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