Dresden 2026 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Complex Fluids and Soft Matter (joint session DY/CPP)

CPP 20.11: Talk

Tuesday, March 10, 2026, 12:15–12:30, ZEU/0160

Rescaled mode-coupling scheme for dynamics in binary mixtures of highly charged colloids — •Daniel Weidig and Joachim Wagner — University of Rostock, Rostock, Germany

We investigate dynamic processes in binary mixtures of highly charged colloidal particles by means of Brownian dynamics and multi-component mode-coupling theory (MCT). As input for MCT, thermodynamically consistent, static structure factors from integral equations with Rogers-Young closure are used which are in quantitative agreement to Fourier transforms of static pair correlation functions resulting from simulations.
MCT based on partial structure factors in many-particle systems predicts dynamic properties such as long-time self-diffusion coefficients in qualitative agreement to simulation trajectories. Using instead structure factors from systems with slightly reduced number of effective charges as input, a quantitative agreement of MCT with simulations is achieved. In mixtures of identically charged particles with different short-time mobilities, this rescaled MCT scheme accurately predicts coupling effects in long-time dynamics observed in Brownian dynamics simulations.

Keywords: Mode-coupling theory; Ornstein-Zernike equation; Brownian dynamics; Self and Collective Dynamics