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DY: Fachverband Dynamik und Statistische Physik

DY 54: Complex Fluids and Colloids, Micelles and Vesicles (joint session CPP/DY)

DY 54.6: Talk

Friday, March 31, 2023, 11:00–11:15, MER 02

Structure and dynamics of concentrated suspensions of PMMA-PDMS core-shell particles — •Joel Diaz Maier, Paul Tümmler, and Joachim Wagner — Institut für Chemie, Universität Rostock, 18051 Rostock, Germany

Sterically stabilized polymer particles with silicone based stabilizers find increasing interest as a novel colloidal model system with hard-sphere interactions. In this contribution, the largely unknown behavior of concentrated suspensions of PMMA-PDMS core-shell particles was investigated over a wide range of volume fractions employing static and dynamic light scattering experiments. Static structure factors extracted from scattered intensities are analyzed using integral equation theory. The wavevector-dependent short-time diffusion of the systems can be accurately described using δ γ-expansion, based on interpolated experimental structure factors as a direct input. All investigated structural and dynamical properties closely follow theoretical predictions for hard-sphere systems, proving the suitability of these colloidal particles as an easily accessible model system for hard spheres.