Molecular dynamics at nanometric length-scales

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• Prof. Fridrich Kremer, University Leipzig, Germany
• Friday 21 January 2011, 14:00-15:00
• Pippard Lecture Theatre, Cavendish Laboratory.

If you have a question about this talk, please contact Erika Eiser.

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.

References:

1.Kremer,F. Schönhals,A. Eds.;Broadband Dielectric Spectroscopy, Springer, Berlin, 2003. 2.Serghei, A.; Kremer, F., In Progress in Colloid and Polymer Science, Grundke, K.; Stamm, M.; Adler, H.-J., Eds.; Springer Berlin, 2006; p 33-40. 3.Huth, H.; Minakov, A. A.; Serghei, A.; Kremer, F.; Schick, C., European Physical Journal -Special Topics 2007, 141, 153. 4.Serghei, A.; Kremer, F., Macromolecular Chemistry and Physics 2008, 209, 810. 5.Serghei, A.; Kremer, F., Review of Scientific Instruments 2008, 79, 026101. 6.Erber, M. Tress, M.,Mapesa, E. U.; Serghei, A ,Eichhorn, K.-J.; Voit, B.; Kremer, F., Macromolecules 43, 7729 (2010), DOI : 10.1021/ma100912r 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

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