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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 47: Wetting, Droplets, and Microfluidics (joint session DY/CPP)
CPP 47.1: Talk
Thursday, March 21, 2024, 15:00–15:15, BH-N 334
Structure Formation in Supraparticles Composed of Spherical and Elongated Colloidal Particles — Yashraj M. Wani1, Melis Yetkin2, •Kritika Kritika1,3,4, Michael Howard5, Hans-Jürgen Butt2, Michael Kappl2, and Arash Nikoubashman1,3,4 — 1Johannes Gutenberg Universität Mainz — 2Max-Planck-Institut für Polymerforschung — 3Leibniz-Institut für Polymerforschung — 4Technische Universität Dresden — 5Department of Chemical Engineering Auburn University
In the present work, we use experiments and computer simulations to investigate the formation of supraparticles (SPs) through the evaporation-driven assembly of spherical and elongated colloidal particles (CPs). We systematically explore how different aspect ratios (λ=4,6,11) of the CPs and the drying conditions influence the final morphologies of SPs. In the evaporation-limited regime, where the rate of CP advection is much larger than the rate of CP diffusion, we find a short-ranged orientational ordering of the CPs on the SP surface and isotropic packing in the core. In contrast, simulations in the diffusion-limited regime show a long-ranged orientational ordering of the rods on the SP surface and local nematic ordering in the core. Additionally, we explore SPs fabricated from rod-sphere mixtures, where a thin shell of rods was observed for the slowly dried SPs. In all cases, we also observe that the porosity of the SPs increases with increasing aspect ratio of the elongated CPs.
Keywords: Supraparticles (SPs); Evaporation-driven assembly; Colloidal particles assembly