Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Nanostructures at surfaces: Wires, tubes

O 52.5: Vortrag

Mittwoch, 16. März 2011, 16:00–16:15, WIL B122

Comparative Study of the Growth of Nonacosan-10-ol Wax Tubules of Lotus (Nelumbo nucifera) Leaves on Gold (111) and HOPG Surface — •Sujit Kumar Dora and Klaus Wandelt — Institute for Physical and Theoretical Chemistry, University of Bonn, Wegelerstr. 12, D-53115, Bonn, Germany

A comparative study of self-assembly of nonacosan-10-ol tubules derived from lotus (Nelumbo nucifera) leaves on gold (111) and HOPG surface is presented. Even though the average time period of tubule formation is ≈ 2-3 hours, however, the orientation of tubules differed on both substrates. On HOPG, a vertical orientation of tubules was found whereas on gold (111) tubules are arranged in a horizontal fashion with respect to the surface. Taking into account the surface properties of HOPG and gold (111) where both are nonpolar, crystalline as well as hydrophobic, the different orientation of tubules on these surfaces clearly indicated that none of the surface properties are responsible for the tubule orientation. This also provokes another question whether HOPG is a good material to mimic natural surfaces.