Dresden 2006 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 45: Soft Matter
DY 45.6: Vortrag
Donnerstag, 30. März 2006, 15:45–16:00, SCH 251
Surface dynamics of capillary waves close to the glass transiton - Experiments with static and dynamic x-ray scattering — •Christian Gutt1,2, Henning Sternemann2, Michael Paulus2, Simone Streit2, Anders Madsen3, Michael Sprung4, and Metin Tolan2 — 1Hasylab at DESY, Notkestrasse 85, 22607 Hamburg — 2Experimentelle Physik I, Universität Dortmund — 3ESRF, Grenoble, France — 4Advanced Photon Source, ANL, Argonne, IL
Liquid surfaces are subject to thermally excited capillary waves which produce a surface roughness of a few Angstrom. Our surface scattering experiments with synchrotron radiation address the question of how these hydrodynamic surface modes become arrested close to the bulk glass transition. For this purpose x-ray reflectivity, grazing incidence diffraction and x-ray photon correlation spectroscopy experiments have been performed. The experiments cover a broad temperature range from room temperature down to temperatures close to the bulk glass transition at 180K. We were able to measure the temperature dependent surface roughness [1], the static height-height correlation function on a lengthscale of nanometers and the dynamic structure factor of the capillary wave fluctuations. The results are compared with theoretical predictions on the freezing behavior of capillary waves at the glass transition [2].
[1] M. Sprung et al. Phys.Rev. E 70, 051809 (2004)
[2] J. Jäckle and K. Kawasaki, J.Phys.:Condens.Matter 7, 4351 (1998)