Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster I

CPP 15.17: Poster

Montag, 18. März 2024, 18:00–20:00, Poster C

Dynamics of Colloidal Hard-Sphere Systems: A Rescaled Mode Coupling Theory Study — •Joel Diaz Maier and Joachim Wagner — Institut für Chemie, Universität Rostock, 18051 Rostock, Germany

Intermediate scattering functions of liquid-like structured suspensions containing model hard-sphere particles are determined by means of static and dynamic light scattering experiments. The structure and short-time dynamics can be quantitatively described by employing multi-component Percus-Yevick integral-equation theory for the structure factors and the δγ-expansion for hydrodynamic functions. Rescaled multi-component mode coupling theory (RMCT) can quantitatively describe the full, experimentally determined collective dynamics across the entire range of volume fractions investigated within the fluid range when the structure factors used for the calculation of the MCT vertices are rescaled to a lower effective volume fraction. Apart from the scaling factor, RMCT provides a parameter-free, correct description for long-time self-diffusion coefficients and the shear viscosity in the limit of small shear gradients.

Keywords: Colloidal suspensions; Mode-coupling theory; Hard spheres; Light scattering; Colloid dynamics