BPCPPDYSOE21 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 12: Posters DY - Fluid Physics, Active Matter, Complex Fluids, Soft Matter and Glasses (joint session DY/BP)

DY 12.8: Poster

Montag, 22. März 2021, 14:00–16:30, DYp

Structural and dynamical properties of gel networks — •Matthias Gimperlein and Michael Schmiedeberg — Institut für theoretische Physik 1, FAU Erlangen-Nürnberg

Gelation is connected to a slow-down in dynamics, the onset of percolation and an increasing number of neighboring particles. The slow-down occurs on different time scales depending on the studied length scales.

Using Brownian Dynamics simulation for a system of colloidal particles interacting due to a modified square well and Yukawa potential we investigate the structural properties of gel networks on different time and length scales depending on system parameters as the strength of attraction or repulsion respectively.

The square well potential is modified by introducing an interaction range α to flatten the walls of the square well. The phase diagram was determined by fitting the vapour-liquid binodal. In the square well limit (α→ 0) results from the literature are recovered. Structural properties as node distribution or link lengths are extracted from minimal networks which allow an easier analysis of the underlying network structure.

Further research includes distinguishing dynamic regimes or structures on different length and time scales, investigating the history/protocol dependency of the development (i. e. starting from different initial configuration) and finding stable or metastable structures to describe the evolution of gel networks not on the particle level anymore, but on a coarse grained level.