Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 6: Glass II (joint session with DY)

DF 6.6: Vortrag

Dienstag, 27. März 2007, 16:10–16:30, H23

A binary Yukawa mixture under shear: A computer simulation study — •Jochen Zausch and Jürgen Horbach — Inst. f. Physik, Universität Mainz, Staudinger Weg 7, 55099 Mainz

Extensive Non-Equilibrium Molecular Dynamics (NEMD) simulations are performed to investigate a binary mixture of like-charged colloids under shear. The interactions between the colloidal particles are modelled by an effective screened Coulomb (Yukawa) potential, without considering explicitly any solvent degrees of freedom. The system is coupled to a DPD thermostat while determining dynamic properties in equilibrium. The DPD thermostat is also used for the NEMD runs where the system is sheared by means of Lees-Edwards boundary conditions. We investigate the dynamic properties in equilibrium and at different constant shear rates in steady state. Moreover, we study how the sheared system relaxes back to equilibrium when we suddenly switch off the shear. To this end, we consider a dynamic four-point susceptibility that measures fluctuations around the mean dynamics.