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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Colloids and Complex Fluids III (joint session BP/CPP/DY, organized by CPP)

CPP 10.11: Talk

Monday, March 7, 2016, 17:45–18:00, H42

Modeling Viscoelastic Properties of Complex Fluids — •Julius Schulz, Alexander Schlaich, Roland Netz, and Julian Kappler — Fachbereich Physik, Freie Universiät Berlin, 14195 Berlin

The viscoelastic response of a complex liquid like water differs significantly from more simple models such as a Lennard-Jones fluid or methane. Using all-atom molecular dynamics simulations, we calculate the frequency-dependent viscosity for two liquids: TIP4P/2005 water and a glycerol/water solution. The corresponding elastic spectrum exhibits two peaks and cannot be described by simple viscoelastic models. We discuss the origins of these features and present a novel extension of the Maxwell model for viscoelastic fluids which is capable of reproducing the relevant features of the frequency-dependent viscosity. Extracted shear relaxation times for the glycerol-water mixtures compare well with experiments.