Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster: Glass Transition and Dynamics of Liquids
CPP 22.1: Poster
Dienstag, 15. März 2011, 18:00–20:00, P2
Elastic Properties of Glasses — •Christian L. Klix, Florian Ebert, Georg Maret, and Peter Keim — University of Konstanz, D-78457 Konstanz, Germany
In this contribution, we present experimental results on the elastic properties of a two dimensional colloidal glass former. Given that glasses are solids, they exhibit a mechanical behaviour similar to crystals, i.e. they possess a finite shear modulus µ. We first extract the dispersion relation of the system where data hinting at structural change in the glassy state is found. Next, this dispersion relation is used to derive the moduli from modes in the long wavelength limit which are thermally excited [1]. We consider finite size and time effects and find the expected frequency dependence of the shear modulus µ. By cooling the system, the significant increase of µ lets us determine the glass transition temperature Tg precisely.
[1] H. H. Von Grünberg, P. Keim, and G. Maret, Phys. Rev. Lett. 93, 255703 (2004)