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SUMMARY:Molecular dynamics at nanometric length-scales - Prof. Fridrich Kr
 emer\, University Leipzig\, Germany
DTSTART:20110121T140000Z
DTEND:20110121T150000Z
UID:TALK28985@talks.cam.ac.uk
CONTACT:Erika Eiser
DESCRIPTION:Broadband Dielectric Spectroscopy (BDS) as one of the maior to
 ols in studying molecular dynamics benefits from the extraordinary advanta
 ge that its sensitivity increases with decreasing thickness of a sample ca
 pacitor and hence with a decreasing amount of sample material. By use of r
 efined preparation techniques and with novel nanostructured electrodes it 
 is possible to avoid the (conventional) evaporation of a metal counterelec
 trode onto the polymerlayer. This enables one to analyse the molecular dyn
 amics of polymerlayers being thinner than 5 nm and poviding usually no ful
 l coverage of the underlying surface. Even measurements of the dynamics of
  quasi-isolated polymer coils are possible. This is demonstrated for a var
 iety of polymers in a wide spectral range (10-2Hz – 106Hz) and at temper
 atures between 150 K to 350 K. Furthermore ellipsometric and AC-calorimetr
 ic studies are included. The results are analysed and discussed within the
  framework of the physical understanding of the dynamic glass transition.\
 n\nReferences: \n\n \n1.Kremer\,F.  Schönhals\,A.  Eds.\;Broadband Dielec
 tric Spectroscopy\,  Springer\, Berlin\, 2003.\n2.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.\n3.Huth\, H.\
 ; Minakov\, A. A.\; Serghei\, A.\; Kremer\, F.\; Schick\, C.\, European Ph
 ysical Journal -Special Topics 2007\, 141\, 153.\n4.Serghei\, A.\; Kremer\
 , F.\, Macromolecular Chemistry and Physics 2008\, 209\, 810.\n5.Serghei\,
  A.\; Kremer\, F.\, Review of Scientific Instruments 2008\, 79\, 026101.\n
 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\n7.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\n8.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\n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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