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DY: Fachverband Dynamik und Statistische Physik

DY 43: Focus session: Slow Dynamics in Glasses and Granular Matter II (joint session DY/ CPP/ DF)

DY 43.8: Vortrag

Freitag, 4. April 2014, 12:00–12:15, HÜL 186

Nonlinear rheology of colloidal systems with attractive interactions: A mode-coupling theory analysis — •Madhu Priya and Thomas Voigtmann — Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Köln, Germany

Hard spheres with a short-ranged attraction are a model system for colloid-polymer mixtures. These systems display two separate glasses, attractive and repulsive, connected with glass-glass transitions and higher-order glass-transition singularities. We study the nonlinear rheology of the square-well system in the vicinity of the glass-glass transition, using mode-coupling theory (MCT) in an isotropic-shear approximation. The yield strength and yield strains are studied, depending on packing fraction, attraction range, and strength. The findings of the model are compared with the observations made by recent experiments and computer simulation studies for colloid-polymer systems.