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BP: Fachverband Biologische Physik

BP 7: Poster Session I

BP 7.8: Poster

Monday, March 9, 2026, 15:00–17:00, P5

Model particles to study interaction of microplastic particles — •Kai Gossen, Andreas Fery, and Günter Auernhammer — IPF Dresden, Dresden, Germany

Microplastic in the environment is typically coated by natural organic matter forming an ecocorona. We present an approach to model ecocorona on parti- cles with well-defined polymers, synthetic and derived from natural polymers. Polystyrene particles were coated with fluorescent polyelectrolyte multilayer systems, PS(Chitosan/Hyaluronic acid) and PS(Poly(dimethyldiallylammonium chloride) /Polystyrene sulfonate) by the layer-by-layer method. Systems with 2, 4 and 6 bilayers were synthesized. The second layers were fluorescently labelled with SNARF conjugated dextran. It was found that zeta potentials of the PS(Chi/HS)2/4/6 systems assume val- ues (-20 mV to -35 mV) that are similar to those of PS-ecocorona particles (-40 mV to -5 mV). The pH-dependent fluorescence of particle suspensions and indi- vidual particles were measured at pH values between pH 3 and pH 8. A well mea- surable pH dependence between pH 4.5 and 8 for the PS(Chi/HS) systems and the PS(PDADMAC/PSS) system could be measured. Automating particle synthesis via cross-flow filtration produces particle batches of up to 5 g. The system could serve to selectively study effects of surface properties of ecocorona coated particles such as surface stiffness or zeta potential.

Keywords: Microplastics; Layer-by-layer; Ecocorona; Cross-flow