SKM 2023 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

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

DY 54.9: Talk

Friday, March 31, 2023, 12:00–12:15, MER 02

Charged, screened-charged and hard-sphere fluids studied by confocal microsopy, analytical theory and simulation. — Sahana Kale, Martin Oettel, and •Hans Joachim Schöpe — Universität Tübingen, Institut für angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen

We present a joint experimental and theoretical study investigating the fluid structure in direct and reciprocal space of PMMA particles dispersed in various solvents. Using decaline and CHB alone the structure can be well-described using PB-RMSA-Theory for monodisperse systems. Upon adding TBAB we observe that the surface charge can't be screened entirely. To model the fluid structure we use Monte Carlo simulations for a polydisperse hard core Yukawa System. Thus we get meaningful data for the effective charge and salt concentration. The results indicate behavior that is significantly different from HS. Surprisingly the situation is fundamentally different for particles dispersed in a mixture of decaline and TCE. Here all measured observables follow polydisperse Percus-Yevick theory.