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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Poster Session II
CPP 35.9: Poster
Mittwoch, 29. März 2023, 11:00–13:00, P1
Supraparticles: Aggregation of colloids in evaporating dispersion drops — •Melis Yetkin1, Yashraj Manish Wani2, Arash Nikoubashman2, Michael Kappl1, and Hans-Jürgen Butt1 — 1Department of Physics at Interfaces, Max-Planck-Institute for Polymer Research, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz,Germany
Evaporating dispersion drops from superamphiphobic surfaces opens a way to fabricate supraparticles (SPs) with complex structures. The structure formation can be controlled by tailoring the interaction forces between particles and process conditions. In this study, the structure of the SPs was investigated by tuning the shape of the primary building blocks and the process conditions. Ellipsoidal polystyrene (PS) particles of different aspect ratios were obtained by stretching a polymeric film of spherical particles above the glass transition temperature. Aqueous dispersion drops of the ellipsodal particles were evaporated from silicone nanofilaments-based superamphiphobic surfaces under varying humidity conditions, during which the evaporation process was monitored by a camera. The interaction between the building blocks, and hence the final morphology of the SPs, were altered by the addition of surfactant sodium dodecyl sulfate (SDS). Control experiments with spherical PS building blocks were conducted in parallel. The study elucidated the effect of primary building block shape on the final morphology of supraparticles and the transition between a shape-dominated regime and an interaction-dominated regime.