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Molecular dynamics at nanometric length-scales

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Broadband Dielectric Spectroscopy (BDS) as one of the maior tools in studying molecular dynamics benefits from the extraordinary advantage that its sensitivity increases with decreasing thickness of a sample capacitor and hence with a decreasing amount of sample material. By use of refined preparation techniques and with novel nanostructured electrodes it is possible to avoid the (conventional) evaporation of a metal counterelectrode onto the polymerlayer. This enables one to analyse the molecular dynamics of polymerlayers being thinner than 5 nm and poviding usually no full coverage of the underlying surface. Even measurements of the dynamics of quasi-isolated polymer coils are possible. This is demonstrated for a variety of polymers in a wide spectral range (10-2Hz – 106Hz) and at temperatures between 150 K to 350 K. Furthermore ellipsometric and AC-calorimetric studies are included. The results are analysed and discussed within the framework of the physical understanding of the dynamic glass transition.


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7.Mapesa, E. U.; Erber, M.; Tress, M.; Eichhorn, K.-J.; Serghei, A; Voit, B.; Kremer, F., Europ. Phys. J. – Special Topics 189, 173-180 (2010), DOI : 10.1140/epjst/e2010-01320-2

8.Treß, M, M. Erber, E.U. Mapesa, H. Huth, J. Müller, A. Serghei, C. Schick, K.-J. Eichhorn, B. Voit and F. Kremer, Macromolecules 2010, , DOI :10.1021/ma 102031k

This talk is part of the BSS Formal Seminars series.

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