Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 74: Nanostructures at surfaces: Other
O 74.6: Vortrag
Donnerstag, 25. März 2010, 16:15–16:30, H34
Studies of Growth of Epicuticular Wax (nonacosan-10-ol) on Model Surfaces by Atomic Force Microscopy (MAC mode) — •Sujit Kumar Dora1, Adrian Niemietz2, Kerstin Koch2, Wilhelm Barthlott2, and Klaus Wandelt1 — 1Institute for Physical and Theoretical Chemistry, University of Bonn, Germany. — 2Nees Institute for Biodiversity of Plants , University of Bonn, Germany.
Plant surfaces are often covered by crystalline self-assembled waxes forming hydrophobic microstructured surfaces. Out of the vast variety of wax morphologies found on plant surfaces, nonacosan-10-ol wax tubules are considered as one of the most important type, found on the leaf surface of lotus (Nelumbo nucifera) and are responsible for the famous self-cleaning phenomena known as "Lotus-effect". The formation of a hydrophobic nanostructure of nonacosanol tubules on lotus leaves is responsible for its superhydrophobicity. In this contribution we describe and discuss the results of the effect of various factors e.g., concentration, presence of water, salt etc. on the growth of wax tubules on various model substrates like HOPG, Mica, Glassy Carbon and Glass as obtained by atomic force microscopy (MAC mode). The rate of tubule formation is faster on nonpolar substrates e.g., HOPG, Glassy Carbon in comparison to polar substrates e.g., Mica, Glass. Only on HOPG tubules were standing perpendicular to the substrate surface. Whereas water considerably increases the growth rate, salts and different concentrations have no effect on growth. In our investigation we developed a systematic approach to understand the different factors affecting the growth of nonacosanol tubules on model substrates.