Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Glasses (joint session CPP/DY, organized by DY)
CPP 51.7: Vortrag
Donnerstag, 10. März 2016, 11:15–11:30, H48
Colloidal monodisperse hard ellipsoids — •Patrick Pfleiderer1, Stefan Schütter2, Nicolai Sänger2, Matthias Klein2, and Andreas Zumbusch2 — 1Department of Physics, University of Konstanz, 78457 Konstanz, Germany — 2Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany
The hard sphere system has been generating hundreds of publications per year for the past decades. The focus of attention has recently been shifted towards anisotropic particles, as rotational degrees of freedom have been identified as key for progress in statistical mechanics models and engineering alike. One prominent puzzle is the violation of Stokes-Einstein(-Debye) relations near the glass transition.
The next obvious simple system besides spheres is the hard ellipsoid system. It lends itself to theoretical descriptions and simulations. While an experimental technique to prepare colloidal poly(methyl methacrylate) (PMMA) ellipsoids exists since the 1990s, little progress has been made towards an establishment anywhere near the 'fruit fly' hard spheres. This is due to the difficulties in endowing several desired properties simultaneously to the system: mass-density and refractive-index matching, hard-core interactions, long-term stability etc. We present the first 3D hard ellipsoid system which meets all these goals, fluorescently labeled with a unique core-shell structure [1], polydispersity as low as 3%, and study the interplay of rotational and translational degrees of freedom approaching the colloidal glass transition.
[1] M.K. Klein, N. Saenger, S. Schuetter, P. Pfleiderer, and A. Zumbusch, Langmuir 30, 12457 (2014).