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DS: Dünne Schichten

DS 15: Organische Schichten

DS 15.3: Talk

Wednesday, March 26, 2003, 17:15–17:30, GER/38

Visco-elastic properties of molecularly thin alkane films at solid/air-interfaces — •Hauke Schollmeyer and Hans Riegler — Max-Planck-Institut für Kolloid- und Grenzflächenforschung, 14476 Golm

We investigate visco-elastic properties of monolayers of long chain alkanes (e.g. triacontane = C30H62) at the SiO2/air-interface. In these monolayers the molecules are oriented normal to the interface in various temperature dependent molecular packings (hexagonal, orthorhombic) /1-3/.

The visco-elastic properties were derived from force-distance curves, which were recorded during punching through the alkane layer with a SFM-tip. The maximum force to break through the monolayer and the displacement energies are correlated with the molecular structure.

/1/ H. Schollmeyer, B. Ocko, and H. Riegler, Langmuir 18: 4351 (2002)
/2/ A. Holzwarth, S. Leporatti, and H. Riegler, Europhysics Letters 52(6): 653 (2000)
/3/ C. Merkl, T. Pfohl, and H. Riegler, Phys. Rev. Lett. 79(2): 4625 (1997)