Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Poster: Colloids and Complex Fluids

CPP 18.8: Poster

Montag, 20. März 2017, 18:30–21:00, P1C

Investigation of dynamical properties of a simple patchy particle model by Monte Carlo simulations — •Marc Habiger, Johannes Bleibel, and Martin Oettel — Institut für Angewandte Physik, Universität Tübingen, Deutschland

Patchy Particles are widely used as a model system for proteins in a solution. We propose a dynamical model for patchy colloidal particles emerging from a binary mixture of particles of different size, "colloids" and "bonds". Both colloids and bonds interact with isotropic, but non-additive hard-sphere like interactions, additionally the colloid-bond interaction contains a short-range, isotropic attraction. The maximum number of bonds on a colloid can be tuned via the repulsion between bonds and is set to four. Our model resembles a soft version of the model studied by E. Zaccarelli et al. [1]

Equilibrium and dynamical properties of the mixture are investigated by (dynamic) Monte Carlo simulations.

We have examined the equation of state, and further we investigate the self and distinct part of the dynamical structure factor and the intermediate scattering function. For the latter the dynamics can not be matched with a single exponential decay, a fact which in the context of experiments is often attributed to the formation of clusters. In this model, it is a consequence of complicated network dynamics.

[1] E. Zaccarelli, F. Sciortino, P. Tartaglia, J. Chem. Phys. 127, 174501 (2007)