Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 42: Colloids and Complex Liquids I

CPP 42.1: Topical Talk

Donnerstag, 25. März 2010, 11:00–11:30, H39

Local dynamics near the 2D-Glass Transition in Binary Colloidal Mixtures — •Georg Maret, Florian Ebert, Sylvain Mazoyer, and Peter Keim — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

Micron sized colloidal particles in suspension are ideal model systems to study structural and dynamic properties of condensed matter at 'atomic' scales. This is illustrated by video microscopy experiments on binary mixtures of superparamagnetic colloids which are pinned at the flat horizontal air/water interface[1]. Their pair potential is tuned by an external magnetic field which drives the 2D system from the liquid to the glassy state. We observe competing local crystallites[2], particle motion coupled to cage motion and intra-cage hopping[3] as well as dynamic heterogeneities which are correlated with the local structural order and the corresponding energy landscape[4].

[1] F.Ebert, P.Dillmann, G.Maret, P.Keim, Rev.Sci.Instrum. 80, 083902(2009)

[2] F.Ebert, P.Keim, G.Maret, EPJE 26, 161(2008), EPJE 29, 311(2009)

[3] S.Mazoyer, F.Ebert, G.Maret and P.Keim, EPL, (2009), in print

[4] S.Mazoyer, F.Ebert, G.Maret and P.Keim, (2009) submitted