Dresden 2020 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 55: Poster: Turbulence; Complex Fluids; Microfluidics; Droplets and Wetting

DY 55.2: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1A

Dynamics of gel networks on different time and length scales — •Matthias Gimperlein and Michael Schmiedeberg — Institut für Theoretische Physik 1, FAU Erlangen-Nürnberg, 91058 Erlangen, Germany

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 potential we investigate the properties of gel networks on different time and length scales.

The square well potential is modified by introducing an additional interaction range α to flatten the walls of the square well such that Brownian dynamics simulations are possible. The phase diagram was determined by fitting the gas-liquid coexistence binodal. In the square well limit (α → 0) the result shown in [1] is recovered.

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 by varying particle density or system structure) 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.

[1] Speck et al., J. Chem. Phys. 148, 241101 (2018)