Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 23: Complex Fluids and Soft Matter 1 (joint session DY/CPP)
CPP 23.3: Talk
Wednesday, September 7, 2022, 10:00–10:15, H18
Phase behaviour of mixtures of hard spheres and hard rods — •Poshika Gandhi1, Joeri Opdam2, Anja Kuhnhold1, Tanja Schilling1, and Remco Tuinier2 — 1Institute of Physics, Albert-Ludwigs-University Freiburg, Germany — 2Institute for Complex Molecular Systems, Eindhoven University of Technology, The Netherlands
Phase behaviours of complex mixtures are challenging to predict. A binary mixture of hard spherocylinders (HSC) and hard spheres (HS) is one such system. As rod-like particles have large excluded volume, a free volume theory (FVT) can be used to gain insights into demixing phenomenon and phase stability.
Vliegenthart et al[1] modified an existing FVT for binary mixtures of HS to accommodate HSC. This FVT works well for the needle limit, i.e., weak excluded volume interactions between HSC. It, however, predicts the phase boundaries at too low HSC concentrations. Opdam et al[2] showed that by incorporating excluded volume interactions between the depletants even in the reservoir improves the FVT significantly.
We used the new FVT to predict phase boundaries of colloidal mixtures and compared them to MC simulations. The results show that accounting for all the excluded volumes of all the components may be pivotal in understanding phase behaviour of colloidal mixtures [3].
[1] G. A. Vliegenthart et al., J. Chem. Phys., 111, 4153 (1999).
[2] J. Opdam, et al., J. Chem. Phys., 154, 204906 (2021)
[3] J. Opdam, et al., Phys. Chem. Chem. Phys., 24, 11820 (2022)