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DY: Fachverband Dynamik und Statistische Physik
DY 17: Soft matter
DY 17.6: Vortrag
Mittwoch, 13. März 2013, 11:15–11:30, H47
Structure and Dynamics of Suspensions of Colloidal Dumbbells — •Nils Heptner1,2, Fangfang Chu1,2, Miriam Siebenbürger1, Matthias Ballauff1,2, and Joachim Dzubiella1,2 — 1Helmholtz-Zentrum Berlin — 2Humboldt-Universität zu Berlin, Germany
We investigate the static and dynamic equilibrium structures of a suspensions of colloidal dumbbells by means of Brownian dynamics (BD) computer simulations and linear response theory. These suspension exhibit an elaborate equilibrium phase diagram1,2. The particular focus is the study of bulk translational and orientational structure and near-equilibrium transport coefficients at different colloid packing fractions and anisotropy parameters for a better understanding of material properties in and out-of equilibrium.
Crystal structures in the plastic crystal (PC) phase are identified and the PC-liquid transition is investigated. We present structural properties in form of static and dynamic structure factors S(q,w) and pair distribution functions g(r). Furthermore we calculate frequency-dependent rotational and translational self-diffusion constants as well as shear viscosities from equilibrium autocorrelation functions. In addition we will present preliminary results of non-equilibrium simulations imposing oscillatory and steady simple shear flow. All results are compared to the hard sphere reference system as well as available experimental scattering and rheology data.
(1) Vega, C. et al. J Chem Phys 1992, 96, 9060-9072.
(2) Marechal, M.; Dijkstra, M Phys Rev E 2008, 77, 061405.